scripts/checkpatch.pl

   1 #!/usr/bin/perl -w
   2 # (c) 2001, Dave Jones. (the file handling bit)
   3 # (c) 2005, Joel Schopp <jschopp@austin.ibm.com> (the ugly bit)
   4 # (c) 2007,2008, Andy Whitcroft <apw@uk.ibm.com> (new conditions, test suite)
   5 # (c) 2008-2010 Andy Whitcroft <apw@canonical.com>
   6 # Licensed under the terms of the GNU GPL License version 2
   7
   8 use strict;
   9 use POSIX;
  10 use File::Basename;
  11 use Cwd 'abs_path';
  12
  13 my $P = $0;
  14 my $D = dirname(abs_path($P));
  15
  16 my $V = '0.32';
  17
  18 use Getopt::Long qw(:config no_auto_abbrev);
  19
  20 my $quiet = 0;
  21 my $tree = 1;
  22 my $chk_signoff = 1;
  23 my $chk_patch = 1;
  24 my $tst_only;
  25 my $emacs = 0;
  26 my $terse = 0;
  27 my $file = 0;
  28 my $check = 0;
  29 my $check_orig = 0;
  30 my $summary = 1;
  31 my $mailback = 0;
  32 my $summary_file = 0;
  33 my $show_types = 0;
  34 my $fix = 0;
  35 my $fix_inplace = 0;
  36 my $root;
  37 my %debug;
  38 my %camelcase = ();
  39 my %use_type = ();
  40 my @use = ();
  41 my %ignore_type = ();
  42 my @ignore = ();
  43 my $help = 0;
  44 my $configuration_file = ".checkpatch.conf";
  45 my $max_line_length = 80;
  46 my $ignore_perl_version = 0;
  47 my $minimum_perl_version = 5.10.0;
  48 my $min_conf_desc_length = 4;
  49 my $spelling_file = "$D/spelling.txt";
  50
  51 sub help {
  52         my ($exitcode) = @_;
  53
  54         print << "EOM";
  55 Usage: $P [OPTION]... [FILE]...
  56 Version: $V
  57
  58 Options:
  59   -q, --quiet                quiet
  60   --no-tree                  run without a kernel tree
  61   --no-signoff               do not check for 'Signed-off-by' line
  62   --patch                    treat FILE as patchfile (default)
  63   --emacs                    emacs compile window format
  64   --terse                    one line per report
  65   -f, --file                 treat FILE as regular source file
  66   --subjective, --strict     enable more subjective tests
  67   --types TYPE(,TYPE2...)    show only these comma separated message types
  68   --ignore TYPE(,TYPE2...)   ignore various comma separated message types
  69   --max-line-length=n        set the maximum line length, if exceeded, warn
  70   --min-conf-desc-length=n   set the min description length, if shorter, warn
  71   --show-types               show the message "types" in the output
  72   --root=PATH                PATH to the kernel tree root
  73   --no-summary               suppress the per-file summary
  74   --mailback                 only produce a report in case of warnings/errors
  75   --summary-file             include the filename in summary
  76   --debug KEY=[0|1]          turn on/off debugging of KEY, where KEY is one of
  77                              'values', 'possible', 'type', and 'attr' (default
  78                              is all off)
  79   --test-only=WORD           report only warnings/errors containing WORD
  80                              literally
  81   --fix                      EXPERIMENTAL - may create horrible results
  82                              If correctable single-line errors exist, create
  83                              "<inputfile>.EXPERIMENTAL-checkpatch-fixes"
  84                              with potential errors corrected to the preferred
  85                              checkpatch style
  86   --fix-inplace              EXPERIMENTAL - may create horrible results
  87                              Is the same as --fix, but overwrites the input
  88                              file.  It's your fault if there's no backup or git
  89   --ignore-perl-version      override checking of perl version.  expect
  90                              runtime errors.
  91   -h, --help, --version      display this help and exit
  92
  93 When FILE is - read standard input.
  94 EOM
  95
  96         exit($exitcode);
  97 }
  98
  99 my $conf = which_conf($configuration_file);
 100 if (-f $conf) {
 101         my @conf_args;
 102         open(my $conffile, '<', "$conf")
 103             or warn "$P: Can't find a readable $configuration_file file $!\n";
 104
 105         while (<$conffile>) {
 106                 my $line = $_;
 107
 108                 $line =~ s/\s*\n?$//g;
 109                 $line =~ s/^\s*//g;
 110                 $line =~ s/\s+/ /g;
 111
 112                 next if ($line =~ m/^\s*#/);
 113                 next if ($line =~ m/^\s*$/);
 114
 115                 my @words = split(" ", $line);
 116                 foreach my $word (@words) {
 117                         last if ($word =~ m/^#/);
 118                         push (@conf_args, $word);
 119                 }
 120         }
 121         close($conffile);
 122         unshift(@ARGV, @conf_args) if @conf_args;
 123 }
 124
 125 GetOptions(
 126         'q|quiet+'      => \$quiet,
 127         'tree!'         => \$tree,
 128         'signoff!'      => \$chk_signoff,
 129         'patch!'        => \$chk_patch,
 130         'emacs!'        => \$emacs,
 131         'terse!'        => \$terse,
 132         'f|file!'       => \$file,
 133         'subjective!'   => \$check,
 134         'strict!'       => \$check,
 135         'ignore=s'      => \@ignore,
 136         'types=s'       => \@use,
 137         'show-types!'   => \$show_types,
 138         'max-line-length=i' => \$max_line_length,
 139         'min-conf-desc-length=i' => \$min_conf_desc_length,
 140         'root=s'        => \$root,
 141         'summary!'      => \$summary,
 142         'mailback!'     => \$mailback,
 143         'summary-file!' => \$summary_file,
 144         'fix!'          => \$fix,
 145         'fix-inplace!'  => \$fix_inplace,
 146         'ignore-perl-version!' => \$ignore_perl_version,
 147         'debug=s'       => \%debug,
 148         'test-only=s'   => \$tst_only,
 149         'h|help'        => \$help,
 150         'version'       => \$help
 151 ) or help(1);
 152
 153 help(0) if ($help);
 154
 155 $fix = 1 if ($fix_inplace);
 156 $check_orig = $check;
 157
 158 my $exit = 0;
 159
 160 if ($^V && $^V lt $minimum_perl_version) {
 161         printf "$P: requires at least perl version %vd\n", $minimum_perl_version;
 162         if (!$ignore_perl_version) {
 163                 exit(1);
 164         }
 165 }
 166
 167 if ($#ARGV < 0) {
 168         print "$P: no input files\n";
 169         exit(1);
 170 }
 171
 172 sub hash_save_array_words {
 173         my ($hashRef, $arrayRef) = @_;
 174
 175         my @array = split(/,/, join(',', @$arrayRef));
 176         foreach my $word (@array) {
 177                 $word =~ s/\s*\n?$//g;
 178                 $word =~ s/^\s*//g;
 179                 $word =~ s/\s+/ /g;
 180                 $word =~ tr/[a-z]/[A-Z]/;
 181
 182                 next if ($word =~ m/^\s*#/);
 183                 next if ($word =~ m/^\s*$/);
 184
 185                 $hashRef->{$word}++;
 186         }
 187 }
 188
 189 sub hash_show_words {
 190         my ($hashRef, $prefix) = @_;
 191
 192         if ($quiet == 0 && keys %$hashRef) {
 193                 print "NOTE: $prefix message types:";
 194                 foreach my $word (sort keys %$hashRef) {
 195                         print " $word";
 196                 }
 197                 print "\n\n";
 198         }
 199 }
 200
 201 hash_save_array_words(\%ignore_type, \@ignore);
 202 hash_save_array_words(\%use_type, \@use);
 203
 204 my $dbg_values = 0;
 205 my $dbg_possible = 0;
 206 my $dbg_type = 0;
 207 my $dbg_attr = 0;
 208 for my $key (keys %debug) {
 209         ## no critic
 210         eval "\${dbg_$key} = '$debug{$key}';";
 211         die "$@" if ($@);
 212 }
 213
 214 my $rpt_cleaners = 0;
 215
 216 if ($terse) {
 217         $emacs = 1;
 218         $quiet++;
 219 }
 220
 221 if ($tree) {
 222         if (defined $root) {
 223                 if (!top_of_kernel_tree($root)) {
 224                         die "$P: $root: --root does not point at a valid tree\n";
 225                 }
 226         } else {
 227                 if (top_of_kernel_tree('.')) {
 228                         $root = '.';
 229                 } elsif ($0 =~ m@(.*)/scripts/[^/]*$@ &&
 230                                                 top_of_kernel_tree($1)) {
 231                         $root = $1;
 232                 }
 233         }
 234
 235         if (!defined $root) {
 236                 print "Must be run from the top-level dir. of a kernel tree\n";
 237                 exit(2);
 238         }
 239 }
 240
 241 my $emitted_corrupt = 0;
 242
 243 our $Ident      = qr{
 244                         [A-Za-z_][A-Za-z\d_]*
 245                         (?:\s*\#\#\s*[A-Za-z_][A-Za-z\d_]*)*
 246                 }x;
 247 our $Storage    = qr{extern|static|asmlinkage};
 248 our $Sparse     = qr{
 249                         __user|
 250                         __kernel|
 251                         __force|
 252                         __iomem|
 253                         __must_check|
 254                         __init_refok|
 255                         __kprobes|
 256                         __ref|
 257                         __rcu
 258                 }x;
 259 our $InitAttributePrefix = qr{__(?:mem|cpu|dev|net_|)};
 260 our $InitAttributeData = qr{$InitAttributePrefix(?:initdata\b)};
 261 our $InitAttributeConst = qr{$InitAttributePrefix(?:initconst\b)};
 262 our $InitAttributeInit = qr{$InitAttributePrefix(?:init\b)};
 263 our $InitAttribute = qr{$InitAttributeData|$InitAttributeConst|$InitAttributeInit};
 264
 265 # Notes to $Attribute:
 266 # We need \b after 'init' otherwise 'initconst' will cause a false positive in a check
 267 our $Attribute  = qr{
 268                         const|
 269                         __percpu|
 270                         __nocast|
 271                         __safe|
 272                         __bitwise__|
 273                         __packed__|
 274                         __packed2__|
 275                         __naked|
 276                         __maybe_unused|
 277                         __always_unused|
 278                         __noreturn|
 279                         __used|
 280                         __cold|
 281                         __pure|
 282                         __noclone|
 283                         __deprecated|
 284                         __read_mostly|
 285                         __kprobes|
 286                         $InitAttribute|
 287                         ____cacheline_aligned|
 288                         ____cacheline_aligned_in_smp|
 289                         ____cacheline_internodealigned_in_smp|
 290                         __weak
 291                   }x;
 292 our $Modifier;
 293 our $Inline     = qr{inline|__always_inline|noinline|__inline|__inline__};
 294 our $Member     = qr{->$Ident|\.$Ident|\[[^]]*\]};
 295 our $Lval       = qr{$Ident(?:$Member)*};
 296
 297 our $Int_type   = qr{(?i)llu|ull|ll|lu|ul|l|u};
 298 our $Binary     = qr{(?i)0b[01]+$Int_type?};
 299 our $Hex        = qr{(?i)0x[0-9a-f]+$Int_type?};
 300 our $Int        = qr{[0-9]+$Int_type?};
 301 our $Octal      = qr{0[0-7]+$Int_type?};
 302 our $String     = qr{"[X\t]*"};
 303 our $Float_hex  = qr{(?i)0x[0-9a-f]+p-?[0-9]+[fl]?};
 304 our $Float_dec  = qr{(?i)(?:[0-9]+\.[0-9]*|[0-9]*\.[0-9]+)(?:e-?[0-9]+)?[fl]?};
 305 our $Float_int  = qr{(?i)[0-9]+e-?[0-9]+[fl]?};
 306 our $Float      = qr{$Float_hex|$Float_dec|$Float_int};
 307 our $Constant   = qr{$Float|$Binary|$Octal|$Hex|$Int};
 308 our $Assignment = qr{\*\=|/=|%=|\+=|-=|<<=|>>=|&=|\^=|\|=|=};
 309 our $Compare    = qr{<=|>=|==|!=|<|(?<!-)>};
 310 our $Arithmetic = qr{\+|-|\*|\/|%};
 311 our $Operators  = qr{
 312                         <=|>=|==|!=|
 313                         =>|->|<<|>>|<|>|!|~|
 314                         &&|\|\||,|\^|\+\+|--|&|\||$Arithmetic
 315                   }x;
 316
 317 our $c90_Keywords = qr{do|for|while|if|else|return|goto|continue|switch|default|case|break}x;
 318
 319 our $NonptrType;
 320 our $NonptrTypeMisordered;
 321 our $NonptrTypeWithAttr;
 322 our $Type;
 323 our $TypeMisordered;
 324 our $Declare;
 325 our $DeclareMisordered;
 326
 327 our $NON_ASCII_UTF8     = qr{
 328         [\xC2-\xDF][\x80-\xBF]               # non-overlong 2-byte
 329         |  \xE0[\xA0-\xBF][\x80-\xBF]        # excluding overlongs
 330         | [\xE1-\xEC\xEE\xEF][\x80-\xBF]{2}  # straight 3-byte
 331         |  \xED[\x80-\x9F][\x80-\xBF]        # excluding surrogates
 332         |  \xF0[\x90-\xBF][\x80-\xBF]{2}     # planes 1-3
 333         | [\xF1-\xF3][\x80-\xBF]{3}          # planes 4-15
 334         |  \xF4[\x80-\x8F][\x80-\xBF]{2}     # plane 16
 335 }x;
 336
 337 our $UTF8       = qr{
 338         [\x09\x0A\x0D\x20-\x7E]              # ASCII
 339         | $NON_ASCII_UTF8
 340 }x;
 341
 342 our $typeOtherOSTypedefs = qr{(?x:
 343         u_(?:char|short|int|long) |          # bsd
 344         u(?:nchar|short|int|long)            # sysv
 345 )};
 346
 347 our $typeTypedefs = qr{(?x:
 348         (?:__)?(?:u|s|be|le)(?:8|16|32|64)|
 349         atomic_t
 350 )};
 351
 352 our $logFunctions = qr{(?x:
 353         printk(?:_ratelimited|_once|)|
 354         (?:[a-z0-9]+_){1,2}(?:printk|emerg|alert|crit|err|warning|warn|notice|info|debug|dbg|vdbg|devel|cont|WARN)(?:_ratelimited|_once|)|
 355         WARN(?:_RATELIMIT|_ONCE|)|
 356         panic|
 357         MODULE_[A-Z_]+|
 358         seq_vprintf|seq_printf|seq_puts
 359 )};
 360
 361 our $signature_tags = qr{(?xi:
 362         Signed-off-by:|
 363         Acked-by:|
 364         Tested-by:|
 365         Reviewed-by:|
 366         Reported-by:|
 367         Suggested-by:|
 368         To:|
 369         Cc:
 370 )};
 371
 372 our @typeListMisordered = (
 373         qr{char\s+(?:un)?signed},
 374         qr{int\s+(?:(?:un)?signed\s+)?short\s},
 375         qr{int\s+short(?:\s+(?:un)?signed)},
 376         qr{short\s+int(?:\s+(?:un)?signed)},
 377         qr{(?:un)?signed\s+int\s+short},
 378         qr{short\s+(?:un)?signed},
 379         qr{long\s+int\s+(?:un)?signed},
 380         qr{int\s+long\s+(?:un)?signed},
 381         qr{long\s+(?:un)?signed\s+int},
 382         qr{int\s+(?:un)?signed\s+long},
 383         qr{int\s+(?:un)?signed},
 384         qr{int\s+long\s+long\s+(?:un)?signed},
 385         qr{long\s+long\s+int\s+(?:un)?signed},
 386         qr{long\s+long\s+(?:un)?signed\s+int},
 387         qr{long\s+long\s+(?:un)?signed},
 388         qr{long\s+(?:un)?signed},
 389 );
 390
 391 our @typeList = (
 392         qr{void},
 393         qr{(?:(?:un)?signed\s+)?char},
 394         qr{(?:(?:un)?signed\s+)?short\s+int},
 395         qr{(?:(?:un)?signed\s+)?short},
 396         qr{(?:(?:un)?signed\s+)?int},
 397         qr{(?:(?:un)?signed\s+)?long\s+int},
 398         qr{(?:(?:un)?signed\s+)?long\s+long\s+int},
 399         qr{(?:(?:un)?signed\s+)?long\s+long},
 400         qr{(?:(?:un)?signed\s+)?long},
 401         qr{(?:un)?signed},
 402         qr{float},
 403         qr{double},
 404         qr{bool},
 405         qr{struct\s+$Ident},
 406         qr{union\s+$Ident},
 407         qr{enum\s+$Ident},
 408         qr{${Ident}_t},
 409         qr{${Ident}_handler},
 410         qr{${Ident}_handler_fn},
 411         @typeListMisordered,
 412 );
 413 our @typeListWithAttr = (
 414         @typeList,
 415         qr{struct\s+$InitAttribute\s+$Ident},
 416         qr{union\s+$InitAttribute\s+$Ident},
 417 );
 418
 419 our @modifierList = (
 420         qr{fastcall},
 421 );
 422
 423 our @mode_permission_funcs = (
 424         ["module_param", 3],
 425         ["module_param_(?:array|named|string)", 4],
 426         ["module_param_array_named", 5],
 427         ["debugfs_create_(?:file|u8|u16|u32|u64|x8|x16|x32|x64|size_t|atomic_t|bool|blob|regset32|u32_array)", 2],
 428         ["proc_create(?:_data|)", 2],
 429         ["(?:CLASS|DEVICE|SENSOR)_ATTR", 2],
 430 );
 431
 432 #Create a search pattern for all these functions to speed up a loop below
 433 our $mode_perms_search = "";
 434 foreach my $entry (@mode_permission_funcs) {
 435         $mode_perms_search .= '|' if ($mode_perms_search ne "");
 436         $mode_perms_search .= $entry->[0];
 437 }
 438
 439 our $allowed_asm_includes = qr{(?x:
 440         irq|
 441         memory|
 442         time|
 443         reboot
 444 )};
 445 # memory.h: ARM has a custom one
 446
 447 # Load common spelling mistakes and build regular expression list.
 448 my $misspellings;
 449 my %spelling_fix;
 450
 451 if (open(my $spelling, '<', $spelling_file)) {
 452         my @spelling_list;
 453         while (<$spelling>) {
 454                 my $line = $_;
 455
 456                 $line =~ s/\s*\n?$//g;
 457                 $line =~ s/^\s*//g;
 458
 459                 next if ($line =~ m/^\s*#/);
 460                 next if ($line =~ m/^\s*$/);
 461
 462                 my ($suspect, $fix) = split(/\|\|/, $line);
 463
 464                 push(@spelling_list, $suspect);
 465                 $spelling_fix{$suspect} = $fix;
 466         }
 467         close($spelling);
 468         $misspellings = join("|", @spelling_list);
 469 } else {
 470         warn "No typos will be found - file '$spelling_file': $!\n";
 471 }
 472
 473 sub build_types {
 474         my $mods = "(?x:  \n" . join("|\n  ", @modifierList) . "\n)";
 475         my $all = "(?x:  \n" . join("|\n  ", @typeList) . "\n)";
 476         my $Misordered = "(?x:  \n" . join("|\n  ", @typeListMisordered) . "\n)";
 477         my $allWithAttr = "(?x:  \n" . join("|\n  ", @typeListWithAttr) . "\n)";
 478         $Modifier       = qr{(?:$Attribute|$Sparse|$mods)};
 479         $NonptrType     = qr{
 480                         (?:$Modifier\s+|const\s+)*
 481                         (?:
 482                                 (?:typeof|__typeof__)\s*\([^\)]*\)|
 483                                 (?:$typeOtherOSTypedefs\b)|
 484                                 (?:$typeTypedefs\b)|
 485                                 (?:${all}\b)
 486                         )
 487                         (?:\s+$Modifier|\s+const)*
 488                   }x;
 489         $NonptrTypeMisordered   = qr{
 490                         (?:$Modifier\s+|const\s+)*
 491                         (?:
 492                                 (?:${Misordered}\b)
 493                         )
 494                         (?:\s+$Modifier|\s+const)*
 495                   }x;
 496         $NonptrTypeWithAttr     = qr{
 497                         (?:$Modifier\s+|const\s+)*
 498                         (?:
 499                                 (?:typeof|__typeof__)\s*\([^\)]*\)|
 500                                 (?:$typeTypedefs\b)|
 501                                 (?:$typeOtherOSTypedefs\b)|
 502                                 (?:${allWithAttr}\b)
 503                         )
 504                         (?:\s+$Modifier|\s+const)*
 505                   }x;
 506         $Type   = qr{
 507                         $NonptrType
 508                         (?:(?:\s|\*|\[\])+\s*const|(?:\s|\*\s*(?:const\s*)?|\[\])+|(?:\s*\[\s*\])+)?
 509                         (?:\s+$Inline|\s+$Modifier)*
 510                   }x;
 511         $TypeMisordered = qr{
 512                         $NonptrTypeMisordered
 513                         (?:(?:\s|\*|\[\])+\s*const|(?:\s|\*\s*(?:const\s*)?|\[\])+|(?:\s*\[\s*\])+)?
 514                         (?:\s+$Inline|\s+$Modifier)*
 515                   }x;
 516         $Declare        = qr{(?:$Storage\s+(?:$Inline\s+)?)?$Type};
 517         $DeclareMisordered      = qr{(?:$Storage\s+(?:$Inline\s+)?)?$TypeMisordered};
 518 }
 519 build_types();
 520
 521 our $Typecast   = qr{\s*(\(\s*$NonptrType\s*\)){0,1}\s*};
 522
 523 # Using $balanced_parens, $LvalOrFunc, or $FuncArg
 524 # requires at least perl version v5.10.0
 525 # Any use must be runtime checked with $^V
 526
 527 our $balanced_parens = qr/(\((?:[^\(\)]++|(?-1))*\))/;
 528 our $LvalOrFunc = qr{((?:[\&\*]\s*)?$Lval)\s*($balanced_parens{0,1})\s*};
 529 our $FuncArg = qr{$Typecast{0,1}($LvalOrFunc|$Constant|$String)};
 530
 531 our $declaration_macros = qr{(?x:
 532         (?:$Storage\s+)?(?:[A-Z_][A-Z0-9]*_){0,2}(?:DEFINE|DECLARE)(?:_[A-Z0-9]+){1,2}\s*\(|
 533         (?:$Storage\s+)?LIST_HEAD\s*\(|
 534         (?:$Storage\s+)?${Type}\s+uninitialized_var\s*\(
 535 )};
 536
 537 sub deparenthesize {
 538         my ($string) = @_;
 539         return "" if (!defined($string));
 540
 541         while ($string =~ /^\s*\(.*\)\s*$/) {
 542                 $string =~ s@^\s*\(\s*@@;
 543                 $string =~ s@\s*\)\s*$@@;
 544         }
 545
 546         $string =~ s@\s+@ @g;
 547
 548         return $string;
 549 }
 550
 551 sub seed_camelcase_file {
 552         my ($file) = @_;
 553
 554         return if (!(-f $file));
 555
 556         local $/;
 557
 558         open(my $include_file, '<', "$file")
 559             or warn "$P: Can't read '$file' $!\n";
 560         my $text = <$include_file>;
 561         close($include_file);
 562
 563         my @lines = split('\n', $text);
 564
 565         foreach my $line (@lines) {
 566                 next if ($line !~ /(?:[A-Z][a-z]|[a-z][A-Z])/);
 567                 if ($line =~ /^[ \t]*(?:#[ \t]*define|typedef\s+$Type)\s+(\w*(?:[A-Z][a-z]|[a-z][A-Z])\w*)/) {
 568                         $camelcase{$1} = 1;
 569                 } elsif ($line =~ /^\s*$Declare\s+(\w*(?:[A-Z][a-z]|[a-z][A-Z])\w*)\s*[\(\[,;]/) {
 570                         $camelcase{$1} = 1;
 571                 } elsif ($line =~ /^\s*(?:union|struct|enum)\s+(\w*(?:[A-Z][a-z]|[a-z][A-Z])\w*)\s*[;\{]/) {
 572                         $camelcase{$1} = 1;
 573                 }
 574         }
 575 }
 576
 577 my $camelcase_seeded = 0;
 578 sub seed_camelcase_includes {
 579         return if ($camelcase_seeded);
 580
 581         my $files;
 582         my $camelcase_cache = "";
 583         my @include_files = ();
 584
 585         $camelcase_seeded = 1;
 586
 587         if (-e ".git") {
 588                 my $git_last_include_commit = `git log --no-merges --pretty=format:"%h%n" -1 -- include`;
 589                 chomp $git_last_include_commit;
 590                 $camelcase_cache = ".checkpatch-camelcase.git.$git_last_include_commit";
 591         } else {
 592                 my $last_mod_date = 0;
 593                 $files = `find $root/include -name "*.h"`;
 594                 @include_files = split('\n', $files);
 595                 foreach my $file (@include_files) {
 596                         my $date = POSIX::strftime("%Y%m%d%H%M",
 597                                                    localtime((stat $file)[9]));
 598                         $last_mod_date = $date if ($last_mod_date < $date);
 599                 }
 600                 $camelcase_cache = ".checkpatch-camelcase.date.$last_mod_date";
 601         }
 602
 603         if ($camelcase_cache ne "" && -f $camelcase_cache) {
 604                 open(my $camelcase_file, '<', "$camelcase_cache")
 605                     or warn "$P: Can't read '$camelcase_cache' $!\n";
 606                 while (<$camelcase_file>) {
 607                         chomp;
 608                         $camelcase{$_} = 1;
 609                 }
 610                 close($camelcase_file);
 611
 612                 return;
 613         }
 614
 615         if (-e ".git") {
 616                 $files = `git ls-files "include/*.h"`;
 617                 @include_files = split('\n', $files);
 618         }
 619
 620         foreach my $file (@include_files) {
 621                 seed_camelcase_file($file);
 622         }
 623
 624         if ($camelcase_cache ne "") {
 625                 unlink glob ".checkpatch-camelcase.*";
 626                 open(my $camelcase_file, '>', "$camelcase_cache")
 627                     or warn "$P: Can't write '$camelcase_cache' $!\n";
 628                 foreach (sort { lc($a) cmp lc($b) } keys(%camelcase)) {
 629                         print $camelcase_file ("$_\n");
 630                 }
 631                 close($camelcase_file);
 632         }
 633 }
 634
 635 sub git_commit_info {
 636         my ($commit, $id, $desc) = @_;
 637
 638         return ($id, $desc) if ((which("git") eq "") || !(-e ".git"));
 639
 640         my $output = `git log --no-color --format='%H %s' -1 $commit 2>&1`;
 641         $output =~ s/^\s*//gm;
 642         my @lines = split("\n", $output);
 643
 644         return ($id, $desc) if ($#lines < 0);
 645
 646         if ($lines[0] =~ /^error: short SHA1 $commit is ambiguous\./) {
 647 # Maybe one day convert this block of bash into something that returns
 648 # all matching commit ids, but it's very slow...
 649 #
 650 #               echo "checking commits $1..."
 651 #               git rev-list --remotes | grep -i "^$1" |
 652 #               while read line ; do
 653 #                   git log --format='%H %s' -1 $line |
 654 #                   echo "commit $(cut -c 1-12,41-)"
 655 #               done
 656         } elsif ($lines[0] =~ /^fatal: ambiguous argument '$commit': unknown revision or path not in the working tree\./) {
 657         } else {
 658                 $id = substr($lines[0], 0, 12);
 659                 $desc = substr($lines[0], 41);
 660         }
 661
 662         return ($id, $desc);
 663 }
 664
 665 $chk_signoff = 0 if ($file);
 666
 667 my @rawlines = ();
 668 my @lines = ();
 669 my @fixed = ();
 670 my @fixed_inserted = ();
 671 my @fixed_deleted = ();
 672 my $fixlinenr = -1;
 673
 674 my $vname;
 675 for my $filename (@ARGV) {
 676         my $FILE;
 677         if ($file) {
 678                 open($FILE, '-|', "diff -u /dev/null $filename") ||
 679                         die "$P: $filename: diff failed - $!\n";
 680         } elsif ($filename eq '-') {
 681                 open($FILE, '<&STDIN');
 682         } else {
 683                 open($FILE, '<', "$filename") ||
 684                         die "$P: $filename: open failed - $!\n";
 685         }
 686         if ($filename eq '-') {
 687                 $vname = 'Your patch';
 688         } else {
 689                 $vname = $filename;
 690         }
 691         while (<$FILE>) {
 692                 chomp;
 693                 push(@rawlines, $_);
 694         }
 695         close($FILE);
 696         if (!process($filename)) {
 697                 $exit = 1;
 698         }
 699         @rawlines = ();
 700         @lines = ();
 701         @fixed = ();
 702         @fixed_inserted = ();
 703         @fixed_deleted = ();
 704         $fixlinenr = -1;
 705 }
 706
 707 exit($exit);
 708
 709 sub top_of_kernel_tree {
 710         my ($root) = @_;
 711
 712         my @tree_check = (
 713                 "COPYING", "CREDITS", "Kbuild", "MAINTAINERS", "Makefile",
 714                 "README", "Documentation", "arch", "include", "drivers",
 715                 "fs", "init", "ipc", "kernel", "lib", "scripts",
 716         );
 717
 718         foreach my $check (@tree_check) {
 719                 if (! -e $root . '/' . $check) {
 720                         return 0;
 721                 }
 722         }
 723         return 1;
 724 }
 725
 726 sub parse_email {
 727         my ($formatted_email) = @_;
 728
 729         my $name = "";
 730         my $address = "";
 731         my $comment = "";
 732
 733         if ($formatted_email =~ /^(.*)<(\S+\@\S+)>(.*)$/) {
 734                 $name = $1;
 735                 $address = $2;
 736                 $comment = $3 if defined $3;
 737         } elsif ($formatted_email =~ /^\s*<(\S+\@\S+)>(.*)$/) {
 738                 $address = $1;
 739                 $comment = $2 if defined $2;
 740         } elsif ($formatted_email =~ /(\S+\@\S+)(.*)$/) {
 741                 $address = $1;
 742                 $comment = $2 if defined $2;
 743                 $formatted_email =~ s/$address.*$//;
 744                 $name = $formatted_email;
 745                 $name = trim($name);
 746                 $name =~ s/^\"|\"$//g;
 747                 # If there's a name left after stripping spaces and
 748                 # leading quotes, and the address doesn't have both
 749                 # leading and trailing angle brackets, the address
 750                 # is invalid. ie:
 751                 #   "joe smith joe@smith.com" bad
 752                 #   "joe smith <joe@smith.com" bad
 753                 if ($name ne "" && $address !~ /^<[^>]+>$/) {
 754                         $name = "";
 755                         $address = "";
 756                         $comment = "";
 757                 }
 758         }
 759
 760         $name = trim($name);
 761         $name =~ s/^\"|\"$//g;
 762         $address = trim($address);
 763         $address =~ s/^\<|\>$//g;
 764
 765         if ($name =~ /[^\w \-]/i) { ##has "must quote" chars
 766                 $name =~ s/(?<!\\)"/\\"/g; ##escape quotes
 767                 $name = "\"$name\"";
 768         }
 769
 770         return ($name, $address, $comment);
 771 }
 772
 773 sub format_email {
 774         my ($name, $address) = @_;
 775
 776         my $formatted_email;
 777
 778         $name = trim($name);
 779         $name =~ s/^\"|\"$//g;
 780         $address = trim($address);
 781
 782         if ($name =~ /[^\w \-]/i) { ##has "must quote" chars
 783                 $name =~ s/(?<!\\)"/\\"/g; ##escape quotes
 784                 $name = "\"$name\"";
 785         }
 786
 787         if ("$name" eq "") {
 788                 $formatted_email = "$address";
 789         } else {
 790                 $formatted_email = "$name <$address>";
 791         }
 792
 793         return $formatted_email;
 794 }
 795
 796 sub which {
 797         my ($bin) = @_;
 798
 799         foreach my $path (split(/:/, $ENV{PATH})) {
 800                 if (-e "$path/$bin") {
 801                         return "$path/$bin";
 802                 }
 803         }
 804
 805         return "";
 806 }
 807
 808 sub which_conf {
 809         my ($conf) = @_;
 810
 811         foreach my $path (split(/:/, ".:$ENV{HOME}:.scripts")) {
 812                 if (-e "$path/$conf") {
 813                         return "$path/$conf";
 814                 }
 815         }
 816
 817         return "";
 818 }
 819
 820 sub expand_tabs {
 821         my ($str) = @_;
 822
 823         my $res = '';
 824         my $n = 0;
 825         for my $c (split(//, $str)) {
 826                 if ($c eq "\t") {
 827                         $res .= ' ';
 828                         $n++;
 829                         for (; ($n % 8) != 0; $n++) {
 830                                 $res .= ' ';
 831                         }
 832                         next;
 833                 }
 834                 $res .= $c;
 835                 $n++;
 836         }
 837
 838         return $res;
 839 }
 840 sub copy_spacing {
 841         (my $res = shift) =~ tr/\t/ /c;
 842         return $res;
 843 }
 844
 845 sub line_stats {
 846         my ($line) = @_;
 847
 848         # Drop the diff line leader and expand tabs
 849         $line =~ s/^.//;
 850         $line = expand_tabs($line);
 851
 852         # Pick the indent from the front of the line.
 853         my ($white) = ($line =~ /^(\s*)/);
 854
 855         return (length($line), length($white));
 856 }
 857
 858 my $sanitise_quote = '';
 859
 860 sub sanitise_line_reset {
 861         my ($in_comment) = @_;
 862
 863         if ($in_comment) {
 864                 $sanitise_quote = '*/';
 865         } else {
 866                 $sanitise_quote = '';
 867         }
 868 }
 869 sub sanitise_line {
 870         my ($line) = @_;
 871
 872         my $res = '';
 873         my $l = '';
 874
 875         my $qlen = 0;
 876         my $off = 0;
 877         my $c;
 878
 879         # Always copy over the diff marker.
 880         $res = substr($line, 0, 1);
 881
 882         for ($off = 1; $off < length($line); $off++) {
 883                 $c = substr($line, $off, 1);
 884
 885                 # Comments we are wacking completly including the begin
 886                 # and end, all to $;.
 887                 if ($sanitise_quote eq '' && substr($line, $off, 2) eq '/*') {
 888                         $sanitise_quote = '*/';
 889
 890                         substr($res, $off, 2, "$;$;");
 891                         $off++;
 892                         next;
 893                 }
 894                 if ($sanitise_quote eq '*/' && substr($line, $off, 2) eq '*/') {
 895                         $sanitise_quote = '';
 896                         substr($res, $off, 2, "$;$;");
 897                         $off++;
 898                         next;
 899                 }
 900                 if ($sanitise_quote eq '' && substr($line, $off, 2) eq '//') {
 901                         $sanitise_quote = '//';
 902
 903                         substr($res, $off, 2, $sanitise_quote);
 904                         $off++;
 905                         next;
 906                 }
 907
 908                 # A \ in a string means ignore the next character.
 909                 if (($sanitise_quote eq "'" || $sanitise_quote eq '"') &&
 910                     $c eq "\\") {
 911                         substr($res, $off, 2, 'XX');
 912                         $off++;
 913                         next;
 914                 }
 915                 # Regular quotes.
 916                 if ($c eq "'" || $c eq '"') {
 917                         if ($sanitise_quote eq '') {
 918                                 $sanitise_quote = $c;
 919
 920                                 substr($res, $off, 1, $c);
 921                                 next;
 922                         } elsif ($sanitise_quote eq $c) {
 923                                 $sanitise_quote = '';
 924                         }
 925                 }
 926
 927                 #print "c<$c> SQ<$sanitise_quote>\n";
 928                 if ($off != 0 && $sanitise_quote eq '*/' && $c ne "\t") {
 929                         substr($res, $off, 1, $;);
 930                 } elsif ($off != 0 && $sanitise_quote eq '//' && $c ne "\t") {
 931                         substr($res, $off, 1, $;);
 932                 } elsif ($off != 0 && $sanitise_quote && $c ne "\t") {
 933                         substr($res, $off, 1, 'X');
 934                 } else {
 935                         substr($res, $off, 1, $c);
 936                 }
 937         }
 938
 939         if ($sanitise_quote eq '//') {
 940                 $sanitise_quote = '';
 941         }
 942
 943         # The pathname on a #include may be surrounded by '<' and '>'.
 944         if ($res =~ /^.\s*\#\s*include\s+\<(.*)\>/) {
 945                 my $clean = 'X' x length($1);
 946                 $res =~ s@\<.*\>@<$clean>@;
 947
 948         # The whole of a #error is a string.
 949         } elsif ($res =~ /^.\s*\#\s*(?:error|warning)\s+(.*)\b/) {
 950                 my $clean = 'X' x length($1);
 951                 $res =~ s@(\#\s*(?:error|warning)\s+).*@$1$clean@;
 952         }
 953
 954         return $res;
 955 }
 956
 957 sub get_quoted_string {
 958         my ($line, $rawline) = @_;
 959
 960         return "" if ($line !~ m/(\"[X\t]+\")/g);
 961         return substr($rawline, $-[0], $+[0] - $-[0]);
 962 }
 963
 964 sub ctx_statement_block {
 965         my ($linenr, $remain, $off) = @_;
 966         my $line = $linenr - 1;
 967         my $blk = '';
 968         my $soff = $off;
 969         my $coff = $off - 1;
 970         my $coff_set = 0;
 971
 972         my $loff = 0;
 973
 974         my $type = '';
 975         my $level = 0;
 976         my @stack = ();
 977         my $p;
 978         my $c;
 979         my $len = 0;
 980
 981         my $remainder;
 982         while (1) {
 983                 @stack = (['', 0]) if ($#stack == -1);
 984
 985                 #warn "CSB: blk<$blk> remain<$remain>\n";
 986                 # If we are about to drop off the end, pull in more
 987                 # context.
 988                 if ($off >= $len) {
 989                         for (; $remain > 0; $line++) {
 990                                 last if (!defined $lines[$line]);
 991                                 next if ($lines[$line] =~ /^-/);
 992                                 $remain--;
 993                                 $loff = $len;
 994                                 $blk .= $lines[$line] . "\n";
 995                                 $len = length($blk);
 996                                 $line++;
 997                                 last;
 998                         }
 999                         # Bail if there is no further context.
1000                         #warn "CSB: blk<$blk> off<$off> len<$len>\n";
1001                         if ($off >= $len) {
1002                                 last;
1003                         }
1004                         if ($level == 0 && substr($blk, $off) =~ /^.\s*#\s*define/) {
1005                                 $level++;
1006                                 $type = '#';
1007                         }
1008                 }
1009                 $p = $c;
1010                 $c = substr($blk, $off, 1);
1011                 $remainder = substr($blk, $off);
1012
1013                 #warn "CSB: c<$c> type<$type> level<$level> remainder<$remainder> coff_set<$coff_set>\n";
1014
1015                 # Handle nested #if/#else.
1016                 if ($remainder =~ /^#\s*(?:ifndef|ifdef|if)\s/) {
1017                         push(@stack, [ $type, $level ]);
1018                 } elsif ($remainder =~ /^#\s*(?:else|elif)\b/) {
1019                         ($type, $level) = @{$stack[$#stack - 1]};
1020                 } elsif ($remainder =~ /^#\s*endif\b/) {
1021                         ($type, $level) = @{pop(@stack)};
1022                 }
1023
1024                 # Statement ends at the ';' or a close '}' at the
1025                 # outermost level.
1026                 if ($level == 0 && $c eq ';') {
1027                         last;
1028                 }
1029
1030                 # An else is really a conditional as long as its not else if
1031                 if ($level == 0 && $coff_set == 0 &&
1032                                 (!defined($p) || $p =~ /(?:\s|\}|\+)/) &&
1033                                 $remainder =~ /^(else)(?:\s|{)/ &&
1034                                 $remainder !~ /^else\s+if\b/) {
1035                         $coff = $off + length($1) - 1;
1036                         $coff_set = 1;
1037                         #warn "CSB: mark coff<$coff> soff<$soff> 1<$1>\n";
1038                         #warn "[" . substr($blk, $soff, $coff - $soff + 1) . "]\n";
1039                 }
1040
1041                 if (($type eq '' || $type eq '(') && $c eq '(') {
1042                         $level++;
1043                         $type = '(';
1044                 }
1045                 if ($type eq '(' && $c eq ')') {
1046                         $level--;
1047                         $type = ($level != 0)? '(' : '';
1048
1049                         if ($level == 0 && $coff < $soff) {
1050                                 $coff = $off;
1051                                 $coff_set = 1;
1052                                 #warn "CSB: mark coff<$coff>\n";
1053                         }
1054                 }
1055                 if (($type eq '' || $type eq '{') && $c eq '{') {
1056                         $level++;
1057                         $type = '{';
1058                 }
1059                 if ($type eq '{' && $c eq '}') {
1060                         $level--;
1061                         $type = ($level != 0)? '{' : '';
1062
1063                         if ($level == 0) {
1064                                 if (substr($blk, $off + 1, 1) eq ';') {
1065                                         $off++;
1066                                 }
1067                                 last;
1068                         }
1069                 }
1070                 # Preprocessor commands end at the newline unless escaped.
1071                 if ($type eq '#' && $c eq "\n" && $p ne "\\") {
1072                         $level--;
1073                         $type = '';
1074                         $off++;
1075                         last;
1076                 }
1077                 $off++;
1078         }
1079         # We are truly at the end, so shuffle to the next line.
1080         if ($off == $len) {
1081                 $loff = $len + 1;
1082                 $line++;
1083                 $remain--;
1084         }
1085
1086         my $statement = substr($blk, $soff, $off - $soff + 1);
1087         my $condition = substr($blk, $soff, $coff - $soff + 1);
1088
1089         #warn "STATEMENT<$statement>\n";
1090         #warn "CONDITION<$condition>\n";
1091
1092         #print "coff<$coff> soff<$off> loff<$loff>\n";
1093
1094         return ($statement, $condition,
1095                         $line, $remain + 1, $off - $loff + 1, $level);
1096 }
1097
1098 sub statement_lines {
1099         my ($stmt) = @_;
1100
1101         # Strip the diff line prefixes and rip blank lines at start and end.
1102         $stmt =~ s/(^|\n)./$1/g;
1103         $stmt =~ s/^\s*//;
1104         $stmt =~ s/\s*$//;
1105
1106         my @stmt_lines = ($stmt =~ /\n/g);
1107
1108         return $#stmt_lines + 2;
1109 }
1110
1111 sub statement_rawlines {
1112         my ($stmt) = @_;
1113
1114         my @stmt_lines = ($stmt =~ /\n/g);
1115
1116         return $#stmt_lines + 2;
1117 }
1118
1119 sub statement_block_size {
1120         my ($stmt) = @_;
1121
1122         $stmt =~ s/(^|\n)./$1/g;
1123         $stmt =~ s/^\s*{//;
1124         $stmt =~ s/}\s*$//;
1125         $stmt =~ s/^\s*//;
1126         $stmt =~ s/\s*$//;
1127
1128         my @stmt_lines = ($stmt =~ /\n/g);
1129         my @stmt_statements = ($stmt =~ /;/g);
1130
1131         my $stmt_lines = $#stmt_lines + 2;
1132         my $stmt_statements = $#stmt_statements + 1;
1133
1134         if ($stmt_lines > $stmt_statements) {
1135                 return $stmt_lines;
1136         } else {
1137                 return $stmt_statements;
1138         }
1139 }
1140
1141 sub ctx_statement_full {
1142         my ($linenr, $remain, $off) = @_;
1143         my ($statement, $condition, $level);
1144
1145         my (@chunks);
1146
1147         # Grab the first conditional/block pair.
1148         ($statement, $condition, $linenr, $remain, $off, $level) =
1149                                 ctx_statement_block($linenr, $remain, $off);
1150         #print "F: c<$condition> s<$statement> remain<$remain>\n";
1151         push(@chunks, [ $condition, $statement ]);
1152         if (!($remain > 0 && $condition =~ /^\s*(?:\n[+-])?\s*(?:if|else|do)\b/s)) {
1153                 return ($level, $linenr, @chunks);
1154         }
1155
1156         # Pull in the following conditional/block pairs and see if they
1157         # could continue the statement.
1158         for (;;) {
1159                 ($statement, $condition, $linenr, $remain, $off, $level) =
1160                                 ctx_statement_block($linenr, $remain, $off);
1161                 #print "C: c<$condition> s<$statement> remain<$remain>\n";
1162                 last if (!($remain > 0 && $condition =~ /^(?:\s*\n[+-])*\s*(?:else|do)\b/s));
1163                 #print "C: push\n";
1164                 push(@chunks, [ $condition, $statement ]);
1165         }
1166
1167         return ($level, $linenr, @chunks);
1168 }
1169
1170 sub ctx_block_get {
1171         my ($linenr, $remain, $outer, $open, $close, $off) = @_;
1172         my $line;
1173         my $start = $linenr - 1;
1174         my $blk = '';
1175         my @o;
1176         my @c;
1177         my @res = ();
1178
1179         my $level = 0;
1180         my @stack = ($level);
1181         for ($line = $start; $remain > 0; $line++) {
1182                 next if ($rawlines[$line] =~ /^-/);
1183                 $remain--;
1184
1185                 $blk .= $rawlines[$line];
1186
1187                 # Handle nested #if/#else.
1188                 if ($lines[$line] =~ /^.\s*#\s*(?:ifndef|ifdef|if)\s/) {
1189                         push(@stack, $level);
1190                 } elsif ($lines[$line] =~ /^.\s*#\s*(?:else|elif)\b/) {
1191                         $level = $stack[$#stack - 1];
1192                 } elsif ($lines[$line] =~ /^.\s*#\s*endif\b/) {
1193                         $level = pop(@stack);
1194                 }
1195
1196                 foreach my $c (split(//, $lines[$line])) {
1197                         ##print "C<$c>L<$level><$open$close>O<$off>\n";
1198                         if ($off > 0) {
1199                                 $off--;
1200                                 next;
1201                         }
1202
1203                         if ($c eq $close && $level > 0) {
1204                                 $level--;
1205                                 last if ($level == 0);
1206                         } elsif ($c eq $open) {
1207                                 $level++;
1208                         }
1209                 }
1210
1211                 if (!$outer || $level <= 1) {
1212                         push(@res, $rawlines[$line]);
1213                 }
1214
1215                 last if ($level == 0);
1216         }
1217
1218         return ($level, @res);
1219 }
1220 sub ctx_block_outer {
1221         my ($linenr, $remain) = @_;
1222
1223         my ($level, @r) = ctx_block_get($linenr, $remain, 1, '{', '}', 0);
1224         return @r;
1225 }
1226 sub ctx_block {
1227         my ($linenr, $remain) = @_;
1228
1229         my ($level, @r) = ctx_block_get($linenr, $remain, 0, '{', '}', 0);
1230         return @r;
1231 }
1232 sub ctx_statement {
1233         my ($linenr, $remain, $off) = @_;
1234
1235         my ($level, @r) = ctx_block_get($linenr, $remain, 0, '(', ')', $off);
1236         return @r;
1237 }
1238 sub ctx_block_level {
1239         my ($linenr, $remain) = @_;
1240
1241         return ctx_block_get($linenr, $remain, 0, '{', '}', 0);
1242 }
1243 sub ctx_statement_level {
1244         my ($linenr, $remain, $off) = @_;
1245
1246         return ctx_block_get($linenr, $remain, 0, '(', ')', $off);
1247 }
1248
1249 sub ctx_locate_comment {
1250         my ($first_line, $end_line) = @_;
1251
1252         # Catch a comment on the end of the line itself.
1253         my ($current_comment) = ($rawlines[$end_line - 1] =~ m@.*(/\*.*\*/)\s*(?:\\\s*)?$@);
1254         return $current_comment if (defined $current_comment);
1255
1256         # Look through the context and try and figure out if there is a
1257         # comment.
1258         my $in_comment = 0;
1259         $current_comment = '';
1260         for (my $linenr = $first_line; $linenr < $end_line; $linenr++) {
1261                 my $line = $rawlines[$linenr - 1];
1262                 #warn "           $line\n";
1263                 if ($linenr == $first_line and $line =~ m@^.\s*\*@) {
1264                         $in_comment = 1;
1265                 }
1266                 if ($line =~ m@/\*@) {
1267                         $in_comment = 1;
1268                 }
1269                 if (!$in_comment && $current_comment ne '') {
1270                         $current_comment = '';
1271                 }
1272                 $current_comment .= $line . "\n" if ($in_comment);
1273                 if ($line =~ m@\*/@) {
1274                         $in_comment = 0;
1275                 }
1276         }
1277
1278         chomp($current_comment);
1279         return($current_comment);
1280 }
1281 sub ctx_has_comment {
1282         my ($first_line, $end_line) = @_;
1283         my $cmt = ctx_locate_comment($first_line, $end_line);
1284
1285         ##print "LINE: $rawlines[$end_line - 1 ]\n";
1286         ##print "CMMT: $cmt\n";
1287
1288         return ($cmt ne '');
1289 }
1290
1291 sub raw_line {
1292         my ($linenr, $cnt) = @_;
1293
1294         my $offset = $linenr - 1;
1295         $cnt++;
1296
1297         my $line;
1298         while ($cnt) {
1299                 $line = $rawlines[$offset++];
1300                 next if (defined($line) && $line =~ /^-/);
1301                 $cnt--;
1302         }
1303
1304         return $line;
1305 }
1306
1307 sub cat_vet {
1308         my ($vet) = @_;
1309         my ($res, $coded);
1310
1311         $res = '';
1312         while ($vet =~ /([^[:cntrl:]]*)([[:cntrl:]]|$)/g) {
1313                 $res .= $1;
1314                 if ($2 ne '') {
1315                         $coded = sprintf("^%c", unpack('C', $2) + 64);
1316                         $res .= $coded;
1317                 }
1318         }
1319         $res =~ s/$/\$/;
1320
1321         return $res;
1322 }
1323
1324 my $av_preprocessor = 0;
1325 my $av_pending;
1326 my @av_paren_type;
1327 my $av_pend_colon;
1328
1329 sub annotate_reset {
1330         $av_preprocessor = 0;
1331         $av_pending = '_';
1332         @av_paren_type = ('E');
1333         $av_pend_colon = 'O';
1334 }
1335
1336 sub annotate_values {
1337         my ($stream, $type) = @_;
1338
1339         my $res;
1340         my $var = '_' x length($stream);
1341         my $cur = $stream;
1342
1343         print "$stream\n" if ($dbg_values > 1);
1344
1345         while (length($cur)) {
1346                 @av_paren_type = ('E') if ($#av_paren_type < 0);
1347                 print " <" . join('', @av_paren_type) .
1348                                 "> <$type> <$av_pending>" if ($dbg_values > 1);
1349                 if ($cur =~ /^(\s+)/o) {
1350                         print "WS($1)\n" if ($dbg_values > 1);
1351                         if ($1 =~ /\n/ && $av_preprocessor) {
1352                                 $type = pop(@av_paren_type);
1353                                 $av_preprocessor = 0;
1354                         }
1355
1356                 } elsif ($cur =~ /^(\(\s*$Type\s*)\)/ && $av_pending eq '_') {
1357                         print "CAST($1)\n" if ($dbg_values > 1);
1358                         push(@av_paren_type, $type);
1359                         $type = 'c';
1360
1361                 } elsif ($cur =~ /^($Type)\s*(?:$Ident|,|\)|\(|\s*$)/) {
1362                         print "DECLARE($1)\n" if ($dbg_values > 1);
1363                         $type = 'T';
1364
1365                 } elsif ($cur =~ /^($Modifier)\s*/) {
1366                         print "MODIFIER($1)\n" if ($dbg_values > 1);
1367                         $type = 'T';
1368
1369                 } elsif ($cur =~ /^(\#\s*define\s*$Ident)(\(?)/o) {
1370                         print "DEFINE($1,$2)\n" if ($dbg_values > 1);
1371                         $av_preprocessor = 1;
1372                         push(@av_paren_type, $type);
1373                         if ($2 ne '') {
1374                                 $av_pending = 'N';
1375                         }
1376                         $type = 'E';
1377
1378                 } elsif ($cur =~ /^(\#\s*(?:undef\s*$Ident|include\b))/o) {
1379                         print "UNDEF($1)\n" if ($dbg_values > 1);
1380                         $av_preprocessor = 1;
1381                         push(@av_paren_type, $type);
1382
1383                 } elsif ($cur =~ /^(\#\s*(?:ifdef|ifndef|if))/o) {
1384                         print "PRE_START($1)\n" if ($dbg_values > 1);
1385                         $av_preprocessor = 1;
1386
1387                         push(@av_paren_type, $type);
1388                         push(@av_paren_type, $type);
1389                         $type = 'E';
1390
1391                 } elsif ($cur =~ /^(\#\s*(?:else|elif))/o) {
1392                         print "PRE_RESTART($1)\n" if ($dbg_values > 1);
1393                         $av_preprocessor = 1;
1394
1395                         push(@av_paren_type, $av_paren_type[$#av_paren_type]);
1396
1397                         $type = 'E';
1398
1399                 } elsif ($cur =~ /^(\#\s*(?:endif))/o) {
1400                         print "PRE_END($1)\n" if ($dbg_values > 1);
1401
1402                         $av_preprocessor = 1;
1403
1404                         # Assume all arms of the conditional end as this
1405                         # one does, and continue as if the #endif was not here.
1406                         pop(@av_paren_type);
1407                         push(@av_paren_type, $type);
1408                         $type = 'E';
1409
1410                 } elsif ($cur =~ /^(\\\n)/o) {
1411                         print "PRECONT($1)\n" if ($dbg_values > 1);
1412
1413                 } elsif ($cur =~ /^(__attribute__)\s*\(?/o) {
1414                         print "ATTR($1)\n" if ($dbg_values > 1);
1415                         $av_pending = $type;
1416                         $type = 'N';
1417
1418                 } elsif ($cur =~ /^(sizeof)\s*(\()?/o) {
1419                         print "SIZEOF($1)\n" if ($dbg_values > 1);
1420                         if (defined $2) {
1421                                 $av_pending = 'V';
1422                         }
1423                         $type = 'N';
1424
1425                 } elsif ($cur =~ /^(if|while|for)\b/o) {
1426                         print "COND($1)\n" if ($dbg_values > 1);
1427                         $av_pending = 'E';
1428                         $type = 'N';
1429
1430                 } elsif ($cur =~/^(case)/o) {
1431                         print "CASE($1)\n" if ($dbg_values > 1);
1432                         $av_pend_colon = 'C';
1433                         $type = 'N';
1434
1435                 } elsif ($cur =~/^(return|else|goto|typeof|__typeof__)\b/o) {
1436                         print "KEYWORD($1)\n" if ($dbg_values > 1);
1437                         $type = 'N';
1438
1439                 } elsif ($cur =~ /^(\()/o) {
1440                         print "PAREN('$1')\n" if ($dbg_values > 1);
1441                         push(@av_paren_type, $av_pending);
1442                         $av_pending = '_';
1443                         $type = 'N';
1444
1445                 } elsif ($cur =~ /^(\))/o) {
1446                         my $new_type = pop(@av_paren_type);
1447                         if ($new_type ne '_') {
1448                                 $type = $new_type;
1449                                 print "PAREN('$1') -> $type\n"
1450                                                         if ($dbg_values > 1);
1451                         } else {
1452                                 print "PAREN('$1')\n" if ($dbg_values > 1);
1453                         }
1454
1455                 } elsif ($cur =~ /^($Ident)\s*\(/o) {
1456                         print "FUNC($1)\n" if ($dbg_values > 1);
1457                         $type = 'V';
1458                         $av_pending = 'V';
1459
1460                 } elsif ($cur =~ /^($Ident\s*):(?:\s*\d+\s*(,|=|;))?/) {
1461                         if (defined $2 && $type eq 'C' || $type eq 'T') {
1462                                 $av_pend_colon = 'B';
1463                         } elsif ($type eq 'E') {
1464                                 $av_pend_colon = 'L';
1465                         }
1466                         print "IDENT_COLON($1,$type>$av_pend_colon)\n" if ($dbg_values > 1);
1467                         $type = 'V';
1468
1469                 } elsif ($cur =~ /^($Ident|$Constant)/o) {
1470                         print "IDENT($1)\n" if ($dbg_values > 1);
1471                         $type = 'V';
1472
1473                 } elsif ($cur =~ /^($Assignment)/o) {
1474                         print "ASSIGN($1)\n" if ($dbg_values > 1);
1475                         $type = 'N';
1476
1477                 } elsif ($cur =~/^(;|{|})/) {
1478                         print "END($1)\n" if ($dbg_values > 1);
1479                         $type = 'E';
1480                         $av_pend_colon = 'O';
1481
1482                 } elsif ($cur =~/^(,)/) {
1483                         print "COMMA($1)\n" if ($dbg_values > 1);
1484                         $type = 'C';
1485
1486                 } elsif ($cur =~ /^(\?)/o) {
1487                         print "QUESTION($1)\n" if ($dbg_values > 1);
1488                         $type = 'N';
1489
1490                 } elsif ($cur =~ /^(:)/o) {
1491                         print "COLON($1,$av_pend_colon)\n" if ($dbg_values > 1);
1492
1493                         substr($var, length($res), 1, $av_pend_colon);
1494                         if ($av_pend_colon eq 'C' || $av_pend_colon eq 'L') {
1495                                 $type = 'E';
1496                         } else {
1497                                 $type = 'N';
1498                         }
1499                         $av_pend_colon = 'O';
1500
1501                 } elsif ($cur =~ /^(\[)/o) {
1502                         print "CLOSE($1)\n" if ($dbg_values > 1);
1503                         $type = 'N';
1504
1505                 } elsif ($cur =~ /^(-(?![->])|\+(?!\+)|\*|\&\&|\&)/o) {
1506                         my $variant;
1507
1508                         print "OPV($1)\n" if ($dbg_values > 1);
1509                         if ($type eq 'V') {
1510                                 $variant = 'B';
1511                         } else {
1512                                 $variant = 'U';
1513                         }
1514
1515                         substr($var, length($res), 1, $variant);
1516                         $type = 'N';
1517
1518                 } elsif ($cur =~ /^($Operators)/o) {
1519                         print "OP($1)\n" if ($dbg_values > 1);
1520                         if ($1 ne '++' && $1 ne '--') {
1521                                 $type = 'N';
1522                         }
1523
1524                 } elsif ($cur =~ /(^.)/o) {
1525                         print "C($1)\n" if ($dbg_values > 1);
1526                 }
1527                 if (defined $1) {
1528                         $cur = substr($cur, length($1));
1529                         $res .= $type x length($1);
1530                 }
1531         }
1532
1533         return ($res, $var);
1534 }
1535
1536 sub possible {
1537         my ($possible, $line) = @_;
1538         my $notPermitted = qr{(?:
1539                 ^(?:
1540                         $Modifier|
1541                         $Storage|
1542                         $Type|
1543                         DEFINE_\S+
1544                 )$|
1545                 ^(?:
1546                         goto|
1547                         return|
1548                         case|
1549                         else|
1550                         asm|__asm__|
1551                         do|
1552                         \#|
1553                         \#\#|
1554                 )(?:\s|$)|
1555                 ^(?:typedef|struct|enum)\b
1556             )}x;
1557         warn "CHECK<$possible> ($line)\n" if ($dbg_possible > 2);
1558         if ($possible !~ $notPermitted) {
1559                 # Check for modifiers.
1560                 $possible =~ s/\s*$Storage\s*//g;
1561                 $possible =~ s/\s*$Sparse\s*//g;
1562                 if ($possible =~ /^\s*$/) {
1563
1564                 } elsif ($possible =~ /\s/) {
1565                         $possible =~ s/\s*$Type\s*//g;
1566                         for my $modifier (split(' ', $possible)) {
1567                                 if ($modifier !~ $notPermitted) {
1568                                         warn "MODIFIER: $modifier ($possible) ($line)\n" if ($dbg_possible);
1569                                         push(@modifierList, $modifier);
1570                                 }
1571                         }
1572
1573                 } else {
1574                         warn "POSSIBLE: $possible ($line)\n" if ($dbg_possible);
1575                         push(@typeList, $possible);
1576                 }
1577                 build_types();
1578         } else {
1579                 warn "NOTPOSS: $possible ($line)\n" if ($dbg_possible > 1);
1580         }
1581 }
1582
1583 my $prefix = '';
1584
1585 sub show_type {
1586         my ($type) = @_;
1587
1588         return defined $use_type{$type} if (scalar keys %use_type > 0);
1589
1590         return !defined $ignore_type{$type};
1591 }
1592
1593 sub report {
1594         my ($level, $type, $msg) = @_;
1595
1596         if (!show_type($type) ||
1597             (defined $tst_only && $msg !~ /\Q$tst_only\E/)) {
1598                 return 0;
1599         }
1600         my $line;
1601         if ($show_types) {
1602                 $line = "$prefix$level:$type: $msg\n";
1603         } else {
1604                 $line = "$prefix$level: $msg\n";
1605         }
1606         $line = (split('\n', $line))[0] . "\n" if ($terse);
1607
1608         push(our @report, $line);
1609
1610         return 1;
1611 }
1612
1613 sub report_dump {
1614         our @report;
1615 }
1616
1617 sub fixup_current_range {
1618         my ($lineRef, $offset, $length) = @_;
1619
1620         if ($$lineRef =~ /^\@\@ -\d+,\d+ \+(\d+),(\d+) \@\@/) {
1621                 my $o = $1;
1622                 my $l = $2;
1623                 my $no = $o + $offset;
1624                 my $nl = $l + $length;
1625                 $$lineRef =~ s/\+$o,$l \@\@/\+$no,$nl \@\@/;
1626         }
1627 }
1628
1629 sub fix_inserted_deleted_lines {
1630         my ($linesRef, $insertedRef, $deletedRef) = @_;
1631
1632         my $range_last_linenr = 0;
1633         my $delta_offset = 0;
1634
1635         my $old_linenr = 0;
1636         my $new_linenr = 0;
1637
1638         my $next_insert = 0;
1639         my $next_delete = 0;
1640
1641         my @lines = ();
1642
1643         my $inserted = @{$insertedRef}[$next_insert++];
1644         my $deleted = @{$deletedRef}[$next_delete++];
1645
1646         foreach my $old_line (@{$linesRef}) {
1647                 my $save_line = 1;
1648                 my $line = $old_line;   #don't modify the array
1649                 if ($line =~ /^(?:\+\+\+\|\-\-\-)\s+\S+/) {     #new filename
1650                         $delta_offset = 0;
1651                 } elsif ($line =~ /^\@\@ -\d+,\d+ \+\d+,\d+ \@\@/) {    #new hunk
1652                         $range_last_linenr = $new_linenr;
1653                         fixup_current_range(\$line, $delta_offset, 0);
1654                 }
1655
1656                 while (defined($deleted) && ${$deleted}{'LINENR'} == $old_linenr) {
1657                         $deleted = @{$deletedRef}[$next_delete++];
1658                         $save_line = 0;
1659                         fixup_current_range(\$lines[$range_last_linenr], $delta_offset--, -1);
1660                 }
1661
1662                 while (defined($inserted) && ${$inserted}{'LINENR'} == $old_linenr) {
1663                         push(@lines, ${$inserted}{'LINE'});
1664                         $inserted = @{$insertedRef}[$next_insert++];
1665                         $new_linenr++;
1666                         fixup_current_range(\$lines[$range_last_linenr], $delta_offset++, 1);
1667                 }
1668
1669                 if ($save_line) {
1670                         push(@lines, $line);
1671                         $new_linenr++;
1672                 }
1673
1674                 $old_linenr++;
1675         }
1676
1677         return @lines;
1678 }
1679
1680 sub fix_insert_line {
1681         my ($linenr, $line) = @_;
1682
1683         my $inserted = {
1684                 LINENR => $linenr,
1685                 LINE => $line,
1686         };
1687         push(@fixed_inserted, $inserted);
1688 }
1689
1690 sub fix_delete_line {
1691         my ($linenr, $line) = @_;
1692
1693         my $deleted = {
1694                 LINENR => $linenr,
1695                 LINE => $line,
1696         };
1697
1698         push(@fixed_deleted, $deleted);
1699 }
1700
1701 sub ERROR {
1702         my ($type, $msg) = @_;
1703
1704         if (report("ERROR", $type, $msg)) {
1705                 our $clean = 0;
1706                 our $cnt_error++;
1707                 return 1;
1708         }
1709         return 0;
1710 }
1711 sub WARN {
1712         my ($type, $msg) = @_;
1713
1714         if (report("WARNING", $type, $msg)) {
1715                 our $clean = 0;
1716                 our $cnt_warn++;
1717                 return 1;
1718         }
1719         return 0;
1720 }
1721 sub CHK {
1722         my ($type, $msg) = @_;
1723
1724         if ($check && report("CHECK", $type, $msg)) {
1725                 our $clean = 0;
1726                 our $cnt_chk++;
1727                 return 1;
1728         }
1729         return 0;
1730 }
1731
1732 sub check_absolute_file {
1733         my ($absolute, $herecurr) = @_;
1734         my $file = $absolute;
1735
1736         ##print "absolute<$absolute>\n";
1737
1738         # See if any suffix of this path is a path within the tree.
1739         while ($file =~ s@^[^/]*/@@) {
1740                 if (-f "$root/$file") {
1741                         ##print "file<$file>\n";
1742                         last;
1743                 }
1744         }
1745         if (! -f _)  {
1746                 return 0;
1747         }
1748
1749         # It is, so see if the prefix is acceptable.
1750         my $prefix = $absolute;
1751         substr($prefix, -length($file)) = '';
1752
1753         ##print "prefix<$prefix>\n";
1754         if ($prefix ne ".../") {
1755                 WARN("USE_RELATIVE_PATH",
1756                      "use relative pathname instead of absolute in changelog text\n" . $herecurr);
1757         }
1758 }
1759
1760 sub trim {
1761         my ($string) = @_;
1762
1763         $string =~ s/^\s+|\s+$//g;
1764
1765         return $string;
1766 }
1767
1768 sub ltrim {
1769         my ($string) = @_;
1770
1771         $string =~ s/^\s+//;
1772
1773         return $string;
1774 }
1775
1776 sub rtrim {
1777         my ($string) = @_;
1778
1779         $string =~ s/\s+$//;
1780
1781         return $string;
1782 }
1783
1784 sub string_find_replace {
1785         my ($string, $find, $replace) = @_;
1786
1787         $string =~ s/$find/$replace/g;
1788
1789         return $string;
1790 }
1791
1792 sub tabify {
1793         my ($leading) = @_;
1794
1795         my $source_indent = 8;
1796         my $max_spaces_before_tab = $source_indent - 1;
1797         my $spaces_to_tab = " " x $source_indent;
1798
1799         #convert leading spaces to tabs
1800         1 while $leading =~ s@^([\t]*)$spaces_to_tab@$1\t@g;
1801         #Remove spaces before a tab
1802         1 while $leading =~ s@^([\t]*)( {1,$max_spaces_before_tab})\t@$1\t@g;
1803
1804         return "$leading";
1805 }
1806
1807 sub pos_last_openparen {
1808         my ($line) = @_;
1809
1810         my $pos = 0;
1811
1812         my $opens = $line =~ tr/\(/\(/;
1813         my $closes = $line =~ tr/\)/\)/;
1814
1815         my $last_openparen = 0;
1816
1817         if (($opens == 0) || ($closes >= $opens)) {
1818                 return -1;
1819         }
1820
1821         my $len = length($line);
1822
1823         for ($pos = 0; $pos < $len; $pos++) {
1824                 my $string = substr($line, $pos);
1825                 if ($string =~ /^($FuncArg|$balanced_parens)/) {
1826                         $pos += length($1) - 1;
1827                 } elsif (substr($line, $pos, 1) eq '(') {
1828                         $last_openparen = $pos;
1829                 } elsif (index($string, '(') == -1) {
1830                         last;
1831                 }
1832         }
1833
1834         return length(expand_tabs(substr($line, 0, $last_openparen))) + 1;
1835 }
1836
1837 sub process {
1838         my $filename = shift;
1839
1840         my $linenr=0;
1841         my $prevline="";
1842         my $prevrawline="";
1843         my $stashline="";
1844         my $stashrawline="";
1845
1846         my $length;
1847         my $indent;
1848         my $previndent=0;
1849         my $stashindent=0;
1850
1851         our $clean = 1;
1852         my $signoff = 0;
1853         my $is_patch = 0;
1854
1855         my $in_header_lines = $file ? 0 : 1;
1856         my $in_commit_log = 0;          #Scanning lines before patch
1857         my $reported_maintainer_file = 0;
1858         my $non_utf8_charset = 0;
1859
1860         my $last_blank_line = 0;
1861         my $last_coalesced_string_linenr = -1;
1862
1863         our @report = ();
1864         our $cnt_lines = 0;
1865         our $cnt_error = 0;
1866         our $cnt_warn = 0;
1867         our $cnt_chk = 0;
1868
1869         # Trace the real file/line as we go.
1870         my $realfile = '';
1871         my $realline = 0;
1872         my $realcnt = 0;
1873         my $here = '';
1874         my $in_comment = 0;
1875         my $comment_edge = 0;
1876         my $first_line = 0;
1877         my $p1_prefix = '';
1878
1879         my $prev_values = 'E';
1880
1881         # suppression flags
1882         my %suppress_ifbraces;
1883         my %suppress_whiletrailers;
1884         my %suppress_export;
1885         my $suppress_statement = 0;
1886
1887         my %signatures = ();
1888
1889         # Pre-scan the patch sanitizing the lines.
1890         # Pre-scan the patch looking for any __setup documentation.
1891         #
1892         my @setup_docs = ();
1893         my $setup_docs = 0;
1894
1895         my $camelcase_file_seeded = 0;
1896
1897         sanitise_line_reset();
1898         my $line;
1899         foreach my $rawline (@rawlines) {
1900                 $linenr++;
1901                 $line = $rawline;
1902
1903                 push(@fixed, $rawline) if ($fix);
1904
1905                 if ($rawline=~/^\+\+\+\s+(\S+)/) {
1906                         $setup_docs = 0;
1907                         if ($1 =~ m@Documentation/kernel-parameters.txt$@) {
1908                                 $setup_docs = 1;
1909                         }
1910                         #next;
1911                 }
1912                 if ($rawline=~/^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@/) {
1913                         $realline=$1-1;
1914                         if (defined $2) {
1915                                 $realcnt=$3+1;
1916                         } else {
1917                                 $realcnt=1+1;
1918                         }
1919                         $in_comment = 0;
1920
1921                         # Guestimate if this is a continuing comment.  Run
1922                         # the context looking for a comment "edge".  If this
1923                         # edge is a close comment then we must be in a comment
1924                         # at context start.
1925                         my $edge;
1926                         my $cnt = $realcnt;
1927                         for (my $ln = $linenr + 1; $cnt > 0; $ln++) {
1928                                 next if (defined $rawlines[$ln - 1] &&
1929                                          $rawlines[$ln - 1] =~ /^-/);
1930                                 $cnt--;
1931                                 #print "RAW<$rawlines[$ln - 1]>\n";
1932                                 last if (!defined $rawlines[$ln - 1]);
1933                                 if ($rawlines[$ln - 1] =~ m@(/\*|\*/)@ &&
1934                                     $rawlines[$ln - 1] !~ m@"[^"]*(?:/\*|\*/)[^"]*"@) {
1935                                         ($edge) = $1;
1936                                         last;
1937                                 }
1938                         }
1939                         if (defined $edge && $edge eq '*/') {
1940                                 $in_comment = 1;
1941                         }
1942
1943                         # Guestimate if this is a continuing comment.  If this
1944                         # is the start of a diff block and this line starts
1945                         # ' *' then it is very likely a comment.
1946                         if (!defined $edge &&
1947                             $rawlines[$linenr] =~ m@^.\s*(?:\*\*+| \*)(?:\s|$)@)
1948                         {
1949                                 $in_comment = 1;
1950                         }
1951
1952                         ##print "COMMENT:$in_comment edge<$edge> $rawline\n";
1953                         sanitise_line_reset($in_comment);
1954
1955                 } elsif ($realcnt && $rawline =~ /^(?:\+| |$)/) {
1956                         # Standardise the strings and chars within the input to
1957                         # simplify matching -- only bother with positive lines.
1958                         $line = sanitise_line($rawline);
1959                 }
1960                 push(@lines, $line);
1961
1962                 if ($realcnt > 1) {
1963                         $realcnt-- if ($line =~ /^(?:\+| |$)/);
1964                 } else {
1965                         $realcnt = 0;
1966                 }
1967
1968                 #print "==>$rawline\n";
1969                 #print "-->$line\n";
1970
1971                 if ($setup_docs && $line =~ /^\+/) {
1972                         push(@setup_docs, $line);
1973                 }
1974         }
1975
1976         $prefix = '';
1977
1978         $realcnt = 0;
1979         $linenr = 0;
1980         $fixlinenr = -1;
1981         foreach my $line (@lines) {
1982                 $linenr++;
1983                 $fixlinenr++;
1984                 my $sline = $line;      #copy of $line
1985                 $sline =~ s/$;/ /g;     #with comments as spaces
1986
1987                 my $rawline = $rawlines[$linenr - 1];
1988
1989 #extract the line range in the file after the patch is applied
1990                 if ($line=~/^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@/) {
1991                         $is_patch = 1;
1992                         $first_line = $linenr + 1;
1993                         $realline=$1-1;
1994                         if (defined $2) {
1995                                 $realcnt=$3+1;
1996                         } else {
1997                                 $realcnt=1+1;
1998                         }
1999                         annotate_reset();
2000                         $prev_values = 'E';
2001
2002                         %suppress_ifbraces = ();
2003                         %suppress_whiletrailers = ();
2004                         %suppress_export = ();
2005                         $suppress_statement = 0;
2006                         next;
2007
2008 # track the line number as we move through the hunk, note that
2009 # new versions of GNU diff omit the leading space on completely
2010 # blank context lines so we need to count that too.
2011                 } elsif ($line =~ /^( |\+|$)/) {
2012                         $realline++;
2013                         $realcnt-- if ($realcnt != 0);
2014
2015                         # Measure the line length and indent.
2016                         ($length, $indent) = line_stats($rawline);
2017
2018                         # Track the previous line.
2019                         ($prevline, $stashline) = ($stashline, $line);
2020                         ($previndent, $stashindent) = ($stashindent, $indent);
2021                         ($prevrawline, $stashrawline) = ($stashrawline, $rawline);
2022
2023                         #warn "line<$line>\n";
2024
2025                 } elsif ($realcnt == 1) {
2026                         $realcnt--;
2027                 }
2028
2029                 my $hunk_line = ($realcnt != 0);
2030
2031 #make up the handle for any error we report on this line
2032                 $prefix = "$filename:$realline: " if ($emacs && $file);
2033                 $prefix = "$filename:$linenr: " if ($emacs && !$file);
2034
2035                 $here = "#$linenr: " if (!$file);
2036                 $here = "#$realline: " if ($file);
2037
2038                 my $found_file = 0;
2039                 # extract the filename as it passes
2040                 if ($line =~ /^diff --git.*?(\S+)$/) {
2041                         $realfile = $1;
2042                         $realfile =~ s@^([^/]*)/@@ if (!$file);
2043                         $in_commit_log = 0;
2044                         $found_file = 1;
2045                 } elsif ($line =~ /^\+\+\+\s+(\S+)/) {
2046                         $realfile = $1;
2047                         $realfile =~ s@^([^/]*)/@@ if (!$file);
2048                         $in_commit_log = 0;
2049
2050                         $p1_prefix = $1;
2051                         if (!$file && $tree && $p1_prefix ne '' &&
2052                             -e "$root/$p1_prefix") {
2053                                 WARN("PATCH_PREFIX",
2054                                      "patch prefix '$p1_prefix' exists, appears to be a -p0 patch\n");
2055                         }
2056
2057                         if ($realfile =~ m@^include/asm/@) {
2058                                 ERROR("MODIFIED_INCLUDE_ASM",
2059                                       "do not modify files in include/asm, change architecture specific files in include/asm-<architecture>\n" . "$here$rawline\n");
2060                         }
2061                         $found_file = 1;
2062                 }
2063
2064                 if ($found_file) {
2065                         if ($realfile =~ m@^(drivers/net/|net/)@) {
2066                                 $check = 1;
2067                         } else {
2068                                 $check = $check_orig;
2069                         }
2070                         next;
2071                 }
2072
2073                 $here .= "FILE: $realfile:$realline:" if ($realcnt != 0);
2074
2075                 my $hereline = "$here\n$rawline\n";
2076                 my $herecurr = "$here\n$rawline\n";
2077                 my $hereprev = "$here\n$prevrawline\n$rawline\n";
2078
2079                 $cnt_lines++ if ($realcnt != 0);
2080
2081 # Check for incorrect file permissions
2082                 if ($line =~ /^new (file )?mode.*[7531]\d{0,2}$/) {
2083                         my $permhere = $here . "FILE: $realfile\n";
2084                         if ($realfile !~ m@scripts/@ &&
2085                             $realfile !~ /\.(py|pl|awk|sh)$/) {
2086                                 ERROR("EXECUTE_PERMISSIONS",
2087                                       "do not set execute permissions for source files\n" . $permhere);
2088                         }
2089                 }
2090
2091 # Check the patch for a signoff:
2092                 if ($line =~ /^\s*signed-off-by:/i) {
2093                         $signoff++;
2094                         $in_commit_log = 0;
2095                 }
2096
2097 # Check if MAINTAINERS is being updated.  If so, there's probably no need to
2098 # emit the "does MAINTAINERS need updating?" message on file add/move/delete
2099                 if ($line =~ /^\s*MAINTAINERS\s*\|/) {
2100                         $reported_maintainer_file = 1;
2101                 }
2102
2103 # Check signature styles
2104                 if (!$in_header_lines &&
2105                     $line =~ /^(\s*)([a-z0-9_-]+by:|$signature_tags)(\s*)(.*)/i) {
2106                         my $space_before = $1;
2107                         my $sign_off = $2;
2108                         my $space_after = $3;
2109                         my $email = $4;
2110                         my $ucfirst_sign_off = ucfirst(lc($sign_off));
2111
2112                         if ($sign_off !~ /$signature_tags/) {
2113                                 WARN("BAD_SIGN_OFF",
2114                                      "Non-standard signature: $sign_off\n" . $herecurr);
2115                         }
2116                         if (defined $space_before && $space_before ne "") {
2117                                 if (WARN("BAD_SIGN_OFF",
2118                                          "Do not use whitespace before $ucfirst_sign_off\n" . $herecurr) &&
2119                                     $fix) {
2120                                         $fixed[$fixlinenr] =
2121                                             "$ucfirst_sign_off $email";
2122                                 }
2123                         }
2124                         if ($sign_off =~ /-by:$/i && $sign_off ne $ucfirst_sign_off) {
2125                                 if (WARN("BAD_SIGN_OFF",
2126                                          "'$ucfirst_sign_off' is the preferred signature form\n" . $herecurr) &&
2127                                     $fix) {
2128                                         $fixed[$fixlinenr] =
2129                                             "$ucfirst_sign_off $email";
2130                                 }
2131
2132                         }
2133                         if (!defined $space_after || $space_after ne " ") {
2134                                 if (WARN("BAD_SIGN_OFF",
2135                                          "Use a single space after $ucfirst_sign_off\n" . $herecurr) &&
2136                                     $fix) {
2137                                         $fixed[$fixlinenr] =
2138                                             "$ucfirst_sign_off $email";
2139                                 }
2140                         }
2141
2142                         my ($email_name, $email_address, $comment) = parse_email($email);
2143                         my $suggested_email = format_email(($email_name, $email_address));
2144                         if ($suggested_email eq "") {
2145                                 ERROR("BAD_SIGN_OFF",
2146                                       "Unrecognized email address: '$email'\n" . $herecurr);
2147                         } else {
2148                                 my $dequoted = $suggested_email;
2149                                 $dequoted =~ s/^"//;
2150                                 $dequoted =~ s/" </ </;
2151                                 # Don't force email to have quotes
2152                                 # Allow just an angle bracketed address
2153                                 if ("$dequoted$comment" ne $email &&
2154                                     "<$email_address>$comment" ne $email &&
2155                                     "$suggested_email$comment" ne $email) {
2156                                         WARN("BAD_SIGN_OFF",
2157                                              "email address '$email' might be better as '$suggested_email$comment'\n" . $herecurr);
2158                                 }
2159                         }
2160
2161 # Check for duplicate signatures
2162                         my $sig_nospace = $line;
2163                         $sig_nospace =~ s/\s//g;
2164                         $sig_nospace = lc($sig_nospace);
2165                         if (defined $signatures{$sig_nospace}) {
2166                                 WARN("BAD_SIGN_OFF",
2167                                      "Duplicate signature\n" . $herecurr);
2168                         } else {
2169                                 $signatures{$sig_nospace} = 1;
2170                         }
2171                 }
2172
2173 # Check email subject for common tools that don't need to be mentioned
2174                 if ($in_header_lines &&
2175                     $line =~ /^Subject:.*\b(?:checkpatch|sparse|smatch)\b[^:]/i) {
2176                         WARN("EMAIL_SUBJECT",
2177                              "A patch subject line should describe the change not the tool that found it\n" . $herecurr);
2178                 }
2179
2180 # Check for old stable address
2181                 if ($line =~ /^\s*cc:\s*.*<?\bstable\@kernel\.org\b>?.*$/i) {
2182                         ERROR("STABLE_ADDRESS",
2183                               "The 'stable' address should be 'stable\@vger.kernel.org'\n" . $herecurr);
2184                 }
2185
2186 # Check for unwanted Gerrit info
2187                 if ($in_commit_log && $line =~ /^\s*change-id:/i) {
2188                         ERROR("GERRIT_CHANGE_ID",
2189                               "Remove Gerrit Change-Id's before submitting upstream.\n" . $herecurr);
2190                 }
2191
2192 # Check for git id commit length and improperly formed commit descriptions
2193                 if ($in_commit_log && $line =~ /\b(c)ommit\s+([0-9a-f]{5,})/i) {
2194                         my $init_char = $1;
2195                         my $orig_commit = lc($2);
2196                         my $short = 1;
2197                         my $long = 0;
2198                         my $case = 1;
2199                         my $space = 1;
2200                         my $hasdesc = 0;
2201                         my $hasparens = 0;
2202                         my $id = '0123456789ab';
2203                         my $orig_desc = "commit description";
2204                         my $description = "";
2205
2206                         $short = 0 if ($line =~ /\bcommit\s+[0-9a-f]{12,40}/i);
2207                         $long = 1 if ($line =~ /\bcommit\s+[0-9a-f]{41,}/i);
2208                         $space = 0 if ($line =~ /\bcommit [0-9a-f]/i);
2209                         $case = 0 if ($line =~ /\b[Cc]ommit\s+[0-9a-f]{5,40}[^A-F]/);
2210                         if ($line =~ /\bcommit\s+[0-9a-f]{5,}\s+\("([^"]+)"\)/i) {
2211                                 $orig_desc = $1;
2212                                 $hasparens = 1;
2213                         } elsif ($line =~ /\bcommit\s+[0-9a-f]{5,}\s*$/i &&
2214                                  defined $rawlines[$linenr] &&
2215                                  $rawlines[$linenr] =~ /^\s*\("([^"]+)"\)/) {
2216                                 $orig_desc = $1;
2217                                 $hasparens = 1;
2218                         } elsif ($line =~ /\bcommit\s+[0-9a-f]{5,}\s+\("[^"]+$/i &&
2219                                  defined $rawlines[$linenr] &&
2220                                  $rawlines[$linenr] =~ /^\s*[^"]+"\)/) {
2221                                 $line =~ /\bcommit\s+[0-9a-f]{5,}\s+\("([^"]+)$/i;
2222                                 $orig_desc = $1;
2223                                 $rawlines[$linenr] =~ /^\s*([^"]+)"\)/;
2224                                 $orig_desc .= " " . $1;
2225                                 $hasparens = 1;
2226                         }
2227
2228                         ($id, $description) = git_commit_info($orig_commit,
2229                                                               $id, $orig_desc);
2230
2231                         if ($short || $long || $space || $case || ($orig_desc ne $description) || !$hasparens) {
2232                                 ERROR("GIT_COMMIT_ID",
2233                                       "Please use git commit description style 'commit <12+ chars of sha1> (\"<title line>\")' - ie: '${init_char}ommit $id (\"$description\")'\n" . $herecurr);
2234                         }
2235                 }
2236
2237 # Check for added, moved or deleted files
2238                 if (!$reported_maintainer_file && !$in_commit_log &&
2239                     ($line =~ /^(?:new|deleted) file mode\s*\d+\s*$/ ||
2240                      $line =~ /^rename (?:from|to) [\w\/\.\-]+\s*$/ ||
2241                      ($line =~ /\{\s*([\w\/\.\-]*)\s*\=\>\s*([\w\/\.\-]*)\s*\}/ &&
2242                       (defined($1) || defined($2))))) {
2243                         $reported_maintainer_file = 1;
2244                         WARN("FILE_PATH_CHANGES",
2245                              "added, moved or deleted file(s), does MAINTAINERS need updating?\n" . $herecurr);
2246                 }
2247
2248 # Check for wrappage within a valid hunk of the file
2249                 if ($realcnt != 0 && $line !~ m{^(?:\+|-| |\\ No newline|$)}) {
2250                         ERROR("CORRUPTED_PATCH",
2251                               "patch seems to be corrupt (line wrapped?)\n" .
2252                                 $herecurr) if (!$emitted_corrupt++);
2253                 }
2254
2255 # Check for absolute kernel paths.
2256                 if ($tree) {
2257                         while ($line =~ m{(?:^|\s)(/\S*)}g) {
2258                                 my $file = $1;
2259
2260                                 if ($file =~ m{^(.*?)(?::\d+)+:?$} &&
2261                                     check_absolute_file($1, $herecurr)) {
2262                                         #
2263                                 } else {
2264                                         check_absolute_file($file, $herecurr);
2265                                 }
2266                         }
2267                 }
2268
2269 # UTF-8 regex found at http://www.w3.org/International/questions/qa-forms-utf-8.en.php
2270                 if (($realfile =~ /^$/ || $line =~ /^\+/) &&
2271                     $rawline !~ m/^$UTF8*$/) {
2272                         my ($utf8_prefix) = ($rawline =~ /^($UTF8*)/);
2273
2274                         my $blank = copy_spacing($rawline);
2275                         my $ptr = substr($blank, 0, length($utf8_prefix)) . "^";
2276                         my $hereptr = "$hereline$ptr\n";
2277
2278                         CHK("INVALID_UTF8",
2279                             "Invalid UTF-8, patch and commit message should be encoded in UTF-8\n" . $hereptr);
2280                 }
2281
2282 # Check if it's the start of a commit log
2283 # (not a header line and we haven't seen the patch filename)
2284                 if ($in_header_lines && $realfile =~ /^$/ &&
2285                     !($rawline =~ /^\s+\S/ ||
2286                       $rawline =~ /^(commit\b|from\b|[\w-]+:).*$/i)) {
2287                         $in_header_lines = 0;
2288                         $in_commit_log = 1;
2289                 }
2290
2291 # Check if there is UTF-8 in a commit log when a mail header has explicitly
2292 # declined it, i.e defined some charset where it is missing.
2293                 if ($in_header_lines &&
2294                     $rawline =~ /^Content-Type:.+charset="(.+)".*$/ &&
2295                     $1 !~ /utf-8/i) {
2296                         $non_utf8_charset = 1;
2297                 }
2298
2299                 if ($in_commit_log && $non_utf8_charset && $realfile =~ /^$/ &&
2300                     $rawline =~ /$NON_ASCII_UTF8/) {
2301                         WARN("UTF8_BEFORE_PATCH",
2302                             "8-bit UTF-8 used in possible commit log\n" . $herecurr);
2303                 }
2304
2305 # Check for various typo / spelling mistakes
2306                 if (defined($misspellings) && ($in_commit_log || $line =~ /^\+/)) {
2307                         while ($rawline =~ /(?:^|[^a-z@])($misspellings)(?:$|[^a-z@])/gi) {
2308                                 my $typo = $1;
2309                                 my $typo_fix = $spelling_fix{lc($typo)};
2310                                 $typo_fix = ucfirst($typo_fix) if ($typo =~ /^[A-Z]/);
2311                                 $typo_fix = uc($typo_fix) if ($typo =~ /^[A-Z]+$/);
2312                                 my $msg_type = \&WARN;
2313                                 $msg_type = \&CHK if ($file);
2314                                 if (&{$msg_type}("TYPO_SPELLING",
2315                                                  "'$typo' may be misspelled - perhaps '$typo_fix'?\n" . $herecurr) &&
2316                                     $fix) {
2317                                         $fixed[$fixlinenr] =~ s/(^|[^A-Za-z@])($typo)($|[^A-Za-z@])/$1$typo_fix$3/;
2318                                 }
2319                         }
2320                 }
2321
2322 # ignore non-hunk lines and lines being removed
2323                 next if (!$hunk_line || $line =~ /^-/);
2324
2325 #trailing whitespace
2326                 if ($line =~ /^\+.*\015/) {
2327                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
2328                         if (ERROR("DOS_LINE_ENDINGS",
2329                                   "DOS line endings\n" . $herevet) &&
2330                             $fix) {
2331                                 $fixed[$fixlinenr] =~ s/[\s\015]+$//;
2332                         }
2333                 } elsif ($rawline =~ /^\+.*\S\s+$/ || $rawline =~ /^\+\s+$/) {
2334                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
2335                         if (ERROR("TRAILING_WHITESPACE",
2336                                   "trailing whitespace\n" . $herevet) &&
2337                             $fix) {
2338                                 $fixed[$fixlinenr] =~ s/\s+$//;
2339                         }
2340
2341                         $rpt_cleaners = 1;
2342                 }
2343
2344 # Check for FSF mailing addresses.
2345                 if ($rawline =~ /\bwrite to the Free/i ||
2346                     $rawline =~ /\b59\s+Temple\s+Pl/i ||
2347                     $rawline =~ /\b51\s+Franklin\s+St/i) {
2348                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
2349                         my $msg_type = \&ERROR;
2350                         $msg_type = \&CHK if ($file);
2351                         &{$msg_type}("FSF_MAILING_ADDRESS",
2352                                      "Do not include the paragraph about writing to the Free Software Foundation's mailing address from the sample GPL notice. The FSF has changed addresses in the past, and may do so again. Linux already includes a copy of the GPL.\n" . $herevet)
2353                 }
2354
2355 # check for Kconfig help text having a real description
2356 # Only applies when adding the entry originally, after that we do not have
2357 # sufficient context to determine whether it is indeed long enough.
2358                 if ($realfile =~ /Kconfig/ &&
2359                     $line =~ /^\+\s*config\s+/) {
2360                         my $length = 0;
2361                         my $cnt = $realcnt;
2362                         my $ln = $linenr + 1;
2363                         my $f;
2364                         my $is_start = 0;
2365                         my $is_end = 0;
2366                         for (; $cnt > 0 && defined $lines[$ln - 1]; $ln++) {
2367                                 $f = $lines[$ln - 1];
2368                                 $cnt-- if ($lines[$ln - 1] !~ /^-/);
2369                                 $is_end = $lines[$ln - 1] =~ /^\+/;
2370
2371                                 next if ($f =~ /^-/);
2372                                 last if (!$file && $f =~ /^\@\@/);
2373
2374                                 if ($lines[$ln - 1] =~ /^\+\s*(?:bool|tristate)\s*\"/) {
2375                                         $is_start = 1;
2376                                 } elsif ($lines[$ln - 1] =~ /^\+\s*(?:---)?help(?:---)?$/) {
2377                                         $length = -1;
2378                                 }
2379
2380                                 $f =~ s/^.//;
2381                                 $f =~ s/#.*//;
2382                                 $f =~ s/^\s+//;
2383                                 next if ($f =~ /^$/);
2384                                 if ($f =~ /^\s*config\s/) {
2385                                         $is_end = 1;
2386                                         last;
2387                                 }
2388                                 $length++;
2389                         }
2390                         if ($is_start && $is_end && $length < $min_conf_desc_length) {
2391                                 WARN("CONFIG_DESCRIPTION",
2392                                      "please write a paragraph that describes the config symbol fully\n" . $herecurr);
2393                         }
2394                         #print "is_start<$is_start> is_end<$is_end> length<$length>\n";
2395                 }
2396
2397 # discourage the addition of CONFIG_EXPERIMENTAL in Kconfig.
2398                 if ($realfile =~ /Kconfig/ &&
2399                     $line =~ /.\s*depends on\s+.*\bEXPERIMENTAL\b/) {
2400                         WARN("CONFIG_EXPERIMENTAL",
2401                              "Use of CONFIG_EXPERIMENTAL is deprecated. For alternatives, see https://lkml.org/lkml/2012/10/23/580\n");
2402                 }
2403
2404 # discourage the use of boolean for type definition attributes of Kconfig options
2405                 if ($realfile =~ /Kconfig/ &&
2406                     $line =~ /^\+\s*\bboolean\b/) {
2407                         WARN("CONFIG_TYPE_BOOLEAN",
2408                              "Use of boolean is deprecated, please use bool instead.\n" . $herecurr);
2409                 }
2410
2411                 if (($realfile =~ /Makefile.*/ || $realfile =~ /Kbuild.*/) &&
2412                     ($line =~ /\+(EXTRA_[A-Z]+FLAGS).*/)) {
2413                         my $flag = $1;
2414                         my $replacement = {
2415                                 'EXTRA_AFLAGS' =>   'asflags-y',
2416                                 'EXTRA_CFLAGS' =>   'ccflags-y',
2417                                 'EXTRA_CPPFLAGS' => 'cppflags-y',
2418                                 'EXTRA_LDFLAGS' =>  'ldflags-y',
2419                         };
2420
2421                         WARN("DEPRECATED_VARIABLE",
2422                              "Use of $flag is deprecated, please use \`$replacement->{$flag} instead.\n" . $herecurr) if ($replacement->{$flag});
2423                 }
2424
2425 # check for DT compatible documentation
2426                 if (defined $root &&
2427                         (($realfile =~ /\.dtsi?$/ && $line =~ /^\+\s*compatible\s*=\s*\"/) ||
2428                          ($realfile =~ /\.[ch]$/ && $line =~ /^\+.*\.compatible\s*=\s*\"/))) {
2429
2430                         my @compats = $rawline =~ /\"([a-zA-Z0-9\-\,\.\+_]+)\"/g;
2431
2432                         my $dt_path = $root . "/Documentation/devicetree/bindings/";
2433                         my $vp_file = $dt_path . "vendor-prefixes.txt";
2434
2435                         foreach my $compat (@compats) {
2436                                 my $compat2 = $compat;
2437                                 $compat2 =~ s/\,[a-zA-Z0-9]*\-/\,<\.\*>\-/;
2438                                 my $compat3 = $compat;
2439                                 $compat3 =~ s/\,([a-z]*)[0-9]*\-/\,$1<\.\*>\-/;
2440                                 `grep -Erq "$compat|$compat2|$compat3" $dt_path`;
2441                                 if ( $? >> 8 ) {
2442                                         WARN("UNDOCUMENTED_DT_STRING",
2443                                              "DT compatible string \"$compat\" appears un-documented -- check $dt_path\n" . $herecurr);
2444                                 }
2445
2446                                 next if $compat !~ /^([a-zA-Z0-9\-]+)\,/;
2447                                 my $vendor = $1;
2448                                 `grep -Eq "^$vendor\\b" $vp_file`;
2449                                 if ( $? >> 8 ) {
2450                                         WARN("UNDOCUMENTED_DT_STRING",
2451                                              "DT compatible string vendor \"$vendor\" appears un-documented -- check $vp_file\n" . $herecurr);
2452                                 }
2453                         }
2454                 }
2455
2456 # check we are in a valid source file if not then ignore this hunk
2457                 next if ($realfile !~ /\.(h|c|s|S|pl|sh|dtsi|dts)$/);
2458
2459 #line length limit
2460                 if ($line =~ /^\+/ && $prevrawline !~ /\/\*\*/ &&
2461                     $rawline !~ /^.\s*\*\s*\@$Ident\s/ &&
2462                     !($line =~ /^\+\s*$logFunctions\s*\(\s*(?:(KERN_\S+\s*|[^"]*))?"[X\t]*"\s*(?:|,|\)\s*;)\s*$/ ||
2463                     $line =~ /^\+\s*"[^"]*"\s*(?:\s*|,|\)\s*;)\s*$/) &&
2464                     $length > $max_line_length)
2465                 {
2466                         WARN("LONG_LINE",
2467                              "line over $max_line_length characters\n" . $herecurr);
2468                 }
2469
2470 # check for adding lines without a newline.
2471                 if ($line =~ /^\+/ && defined $lines[$linenr] && $lines[$linenr] =~ /^\\ No newline at end of file/) {
2472                         WARN("MISSING_EOF_NEWLINE",
2473                              "adding a line without newline at end of file\n" . $herecurr);
2474                 }
2475
2476 # Blackfin: use hi/lo macros
2477                 if ($realfile =~ m@arch/blackfin/.*\.S$@) {
2478                         if ($line =~ /\.[lL][[:space:]]*=.*&[[:space:]]*0x[fF][fF][fF][fF]/) {
2479                                 my $herevet = "$here\n" . cat_vet($line) . "\n";
2480                                 ERROR("LO_MACRO",
2481                                       "use the LO() macro, not (... & 0xFFFF)\n" . $herevet);
2482                         }
2483                         if ($line =~ /\.[hH][[:space:]]*=.*>>[[:space:]]*16/) {
2484                                 my $herevet = "$here\n" . cat_vet($line) . "\n";
2485                                 ERROR("HI_MACRO",
2486                                       "use the HI() macro, not (... >> 16)\n" . $herevet);
2487                         }
2488                 }
2489
2490 # check we are in a valid source file C or perl if not then ignore this hunk
2491                 next if ($realfile !~ /\.(h|c|pl|dtsi|dts)$/);
2492
2493 # at the beginning of a line any tabs must come first and anything
2494 # more than 8 must use tabs.
2495                 if ($rawline =~ /^\+\s* \t\s*\S/ ||
2496                     $rawline =~ /^\+\s*        \s*/) {
2497                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
2498                         $rpt_cleaners = 1;
2499                         if (ERROR("CODE_INDENT",
2500                                   "code indent should use tabs where possible\n" . $herevet) &&
2501                             $fix) {
2502                                 $fixed[$fixlinenr] =~ s/^\+([ \t]+)/"\+" . tabify($1)/e;
2503                         }
2504                 }
2505
2506 # check for space before tabs.
2507                 if ($rawline =~ /^\+/ && $rawline =~ / \t/) {
2508                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
2509                         if (WARN("SPACE_BEFORE_TAB",
2510                                 "please, no space before tabs\n" . $herevet) &&
2511                             $fix) {
2512                                 while ($fixed[$fixlinenr] =~
2513                                            s/(^\+.*) {8,8}\t/$1\t\t/) {}
2514                                 while ($fixed[$fixlinenr] =~
2515                                            s/(^\+.*) +\t/$1\t/) {}
2516                         }
2517                 }
2518
2519 # check for && or || at the start of a line
2520                 if ($rawline =~ /^\+\s*(&&|\|\|)/) {
2521                         CHK("LOGICAL_CONTINUATIONS",
2522                             "Logical continuations should be on the previous line\n" . $hereprev);
2523                 }
2524
2525 # check multi-line statement indentation matches previous line
2526                 if ($^V && $^V ge 5.10.0 &&
2527                     $prevline =~ /^\+([ \t]*)((?:$c90_Keywords(?:\s+if)\s*)|(?:$Declare\s*)?(?:$Ident|\(\s*\*\s*$Ident\s*\))\s*|$Ident\s*=\s*$Ident\s*)\(.*(\&\&|\|\||,)\s*$/) {
2528                         $prevline =~ /^\+(\t*)(.*)$/;
2529                         my $oldindent = $1;
2530                         my $rest = $2;
2531
2532                         my $pos = pos_last_openparen($rest);
2533                         if ($pos >= 0) {
2534                                 $line =~ /^(\+| )([ \t]*)/;
2535                                 my $newindent = $2;
2536
2537                                 my $goodtabindent = $oldindent .
2538                                         "\t" x ($pos / 8) .
2539                                         " "  x ($pos % 8);
2540                                 my $goodspaceindent = $oldindent . " "  x $pos;
2541
2542                                 if ($newindent ne $goodtabindent &&
2543                                     $newindent ne $goodspaceindent) {
2544
2545                                         if (CHK("PARENTHESIS_ALIGNMENT",
2546                                                 "Alignment should match open parenthesis\n" . $hereprev) &&
2547                                             $fix && $line =~ /^\+/) {
2548                                                 $fixed[$fixlinenr] =~
2549                                                     s/^\+[ \t]*/\+$goodtabindent/;
2550                                         }
2551                                 }
2552                         }
2553                 }
2554
2555                 if ($line =~ /^\+.*(\w+\s*)?\(\s*$Type\s*\)[ \t]+(?!$Assignment|$Arithmetic|[,;:\?\(\{\}\[\<\>]|&&|\|\||\\$)/ &&
2556                     (!defined($1) || $1 !~ /sizeof\s*/)) {
2557                         if (CHK("SPACING",
2558                                 "No space is necessary after a cast\n" . $herecurr) &&
2559                             $fix) {
2560                                 $fixed[$fixlinenr] =~
2561                                     s/(\(\s*$Type\s*\))[ \t]+/$1/;
2562                         }
2563                 }
2564
2565                 if ($realfile =~ m@^(drivers/net/|net/)@ &&
2566                     $prevrawline =~ /^\+[ \t]*\/\*[ \t]*$/ &&
2567                     $rawline =~ /^\+[ \t]*\*/ &&
2568                     $realline > 2) {
2569                         WARN("NETWORKING_BLOCK_COMMENT_STYLE",
2570                              "networking block comments don't use an empty /* line, use /* Comment...\n" . $hereprev);
2571                 }
2572
2573                 if ($realfile =~ m@^(drivers/net/|net/)@ &&
2574                     $prevrawline =~ /^\+[ \t]*\/\*/ &&          #starting /*
2575                     $prevrawline !~ /\*\/[ \t]*$/ &&            #no trailing */
2576                     $rawline =~ /^\+/ &&                        #line is new
2577                     $rawline !~ /^\+[ \t]*\*/) {                #no leading *
2578                         WARN("NETWORKING_BLOCK_COMMENT_STYLE",
2579                              "networking block comments start with * on subsequent lines\n" . $hereprev);
2580                 }
2581
2582                 if ($realfile =~ m@^(drivers/net/|net/)@ &&
2583                     $rawline !~ m@^\+[ \t]*\*/[ \t]*$@ &&       #trailing */
2584                     $rawline !~ m@^\+.*/\*.*\*/[ \t]*$@ &&      #inline /*...*/
2585                     $rawline !~ m@^\+.*\*{2,}/[ \t]*$@ &&       #trailing **/
2586                     $rawline =~ m@^\+[ \t]*.+\*\/[ \t]*$@) {    #non blank */
2587                         WARN("NETWORKING_BLOCK_COMMENT_STYLE",
2588                              "networking block comments put the trailing */ on a separate line\n" . $herecurr);
2589                 }
2590
2591 # check for missing blank lines after struct/union declarations
2592 # with exceptions for various attributes and macros
2593                 if ($prevline =~ /^[\+ ]};?\s*$/ &&
2594                     $line =~ /^\+/ &&
2595                     !($line =~ /^\+\s*$/ ||
2596                       $line =~ /^\+\s*EXPORT_SYMBOL/ ||
2597                       $line =~ /^\+\s*MODULE_/i ||
2598                       $line =~ /^\+\s*\#\s*(?:end|elif|else)/ ||
2599                       $line =~ /^\+[a-z_]*init/ ||
2600                       $line =~ /^\+\s*(?:static\s+)?[A-Z_]*ATTR/ ||
2601                       $line =~ /^\+\s*DECLARE/ ||
2602                       $line =~ /^\+\s*__setup/)) {
2603                         if (CHK("LINE_SPACING",
2604                                 "Please use a blank line after function/struct/union/enum declarations\n" . $hereprev) &&
2605                             $fix) {
2606                                 fix_insert_line($fixlinenr, "\+");
2607                         }
2608                 }
2609
2610 # check for multiple consecutive blank lines
2611                 if ($prevline =~ /^[\+ ]\s*$/ &&
2612                     $line =~ /^\+\s*$/ &&
2613                     $last_blank_line != ($linenr - 1)) {
2614                         if (CHK("LINE_SPACING",
2615                                 "Please don't use multiple blank lines\n" . $hereprev) &&
2616                             $fix) {
2617                                 fix_delete_line($fixlinenr, $rawline);
2618                         }
2619
2620                         $last_blank_line = $linenr;
2621                 }
2622
2623 # check for missing blank lines after declarations
2624                 if ($sline =~ /^\+\s+\S/ &&                     #Not at char 1
2625                         # actual declarations
2626                     ($prevline =~ /^\+\s+$Declare\s*$Ident\s*[=,;:\[]/ ||
2627                         # function pointer declarations
2628                      $prevline =~ /^\+\s+$Declare\s*\(\s*\*\s*$Ident\s*\)\s*[=,;:\[\(]/ ||
2629                         # foo bar; where foo is some local typedef or #define
2630                      $prevline =~ /^\+\s+$Ident(?:\s+|\s*\*\s*)$Ident\s*[=,;\[]/ ||
2631                         # known declaration macros
2632                      $prevline =~ /^\+\s+$declaration_macros/) &&
2633                         # for "else if" which can look like "$Ident $Ident"
2634                     !($prevline =~ /^\+\s+$c90_Keywords\b/ ||
2635                         # other possible extensions of declaration lines
2636                       $prevline =~ /(?:$Compare|$Assignment|$Operators)\s*$/ ||
2637                         # not starting a section or a macro "\" extended line
2638                       $prevline =~ /(?:\{\s*|\\)$/) &&
2639                         # looks like a declaration
2640                     !($sline =~ /^\+\s+$Declare\s*$Ident\s*[=,;:\[]/ ||
2641                         # function pointer declarations
2642                       $sline =~ /^\+\s+$Declare\s*\(\s*\*\s*$Ident\s*\)\s*[=,;:\[\(]/ ||
2643                         # foo bar; where foo is some local typedef or #define
2644                       $sline =~ /^\+\s+$Ident(?:\s+|\s*\*\s*)$Ident\s*[=,;\[]/ ||
2645                         # known declaration macros
2646                       $sline =~ /^\+\s+$declaration_macros/ ||
2647                         # start of struct or union or enum
2648                       $sline =~ /^\+\s+(?:union|struct|enum|typedef)\b/ ||
2649                         # start or end of block or continuation of declaration
2650                       $sline =~ /^\+\s+(?:$|[\{\}\.\#\"\?\:\(\[])/ ||
2651                         # bitfield continuation
2652                       $sline =~ /^\+\s+$Ident\s*:\s*\d+\s*[,;]/ ||
2653                         # other possible extensions of declaration lines
2654                       $sline =~ /^\+\s+\(?\s*(?:$Compare|$Assignment|$Operators)/) &&
2655                         # indentation of previous and current line are the same
2656                     (($prevline =~ /\+(\s+)\S/) && $sline =~ /^\+$1\S/)) {
2657                         if (WARN("LINE_SPACING",
2658                                  "Missing a blank line after declarations\n" . $hereprev) &&
2659                             $fix) {
2660                                 fix_insert_line($fixlinenr, "\+");
2661                         }
2662                 }
2663
2664 # check for spaces at the beginning of a line.
2665 # Exceptions:
2666 #  1) within comments
2667 #  2) indented preprocessor commands
2668 #  3) hanging labels
2669                 if ($rawline =~ /^\+ / && $line !~ /^\+ *(?:$;|#|$Ident:)/)  {
2670                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
2671                         if (WARN("LEADING_SPACE",
2672                                  "please, no spaces at the start of a line\n" . $herevet) &&
2673                             $fix) {
2674                                 $fixed[$fixlinenr] =~ s/^\+([ \t]+)/"\+" . tabify($1)/e;
2675                         }
2676                 }
2677
2678 # check we are in a valid C source file if not then ignore this hunk
2679                 next if ($realfile !~ /\.(h|c)$/);
2680
2681 # check indentation of any line with a bare else
2682 # (but not if it is a multiple line "if (foo) return bar; else return baz;")
2683 # if the previous line is a break or return and is indented 1 tab more...
2684                 if ($sline =~ /^\+([\t]+)(?:}[ \t]*)?else(?:[ \t]*{)?\s*$/) {
2685                         my $tabs = length($1) + 1;
2686                         if ($prevline =~ /^\+\t{$tabs,$tabs}break\b/ ||
2687                             ($prevline =~ /^\+\t{$tabs,$tabs}return\b/ &&
2688                              defined $lines[$linenr] &&
2689                              $lines[$linenr] !~ /^[ \+]\t{$tabs,$tabs}return/)) {
2690                                 WARN("UNNECESSARY_ELSE",
2691                                      "else is not generally useful after a break or return\n" . $hereprev);
2692                         }
2693                 }
2694
2695 # check indentation of a line with a break;
2696 # if the previous line is a goto or return and is indented the same # of tabs
2697                 if ($sline =~ /^\+([\t]+)break\s*;\s*$/) {
2698                         my $tabs = $1;
2699                         if ($prevline =~ /^\+$tabs(?:goto|return)\b/) {
2700                                 WARN("UNNECESSARY_BREAK",
2701                                      "break is not useful after a goto or return\n" . $hereprev);
2702                         }
2703                 }
2704
2705 # discourage the addition of CONFIG_EXPERIMENTAL in #if(def).
2706                 if ($line =~ /^\+\s*\#\s*if.*\bCONFIG_EXPERIMENTAL\b/) {
2707                         WARN("CONFIG_EXPERIMENTAL",
2708                              "Use of CONFIG_EXPERIMENTAL is deprecated. For alternatives, see https://lkml.org/lkml/2012/10/23/580\n");
2709                 }
2710
2711 # check for RCS/CVS revision markers
2712                 if ($rawline =~ /^\+.*\$(Revision|Log|Id)(?:\$|)/) {
2713                         WARN("CVS_KEYWORD",
2714                              "CVS style keyword markers, these will _not_ be updated\n". $herecurr);
2715                 }
2716
2717 # Blackfin: don't use __builtin_bfin_[cs]sync
2718                 if ($line =~ /__builtin_bfin_csync/) {
2719                         my $herevet = "$here\n" . cat_vet($line) . "\n";
2720                         ERROR("CSYNC",
2721                               "use the CSYNC() macro in asm/blackfin.h\n" . $herevet);
2722                 }
2723                 if ($line =~ /__builtin_bfin_ssync/) {
2724                         my $herevet = "$here\n" . cat_vet($line) . "\n";
2725                         ERROR("SSYNC",
2726                               "use the SSYNC() macro in asm/blackfin.h\n" . $herevet);
2727                 }
2728
2729 # check for old HOTPLUG __dev<foo> section markings
2730                 if ($line =~ /\b(__dev(init|exit)(data|const|))\b/) {
2731                         WARN("HOTPLUG_SECTION",
2732                              "Using $1 is unnecessary\n" . $herecurr);
2733                 }
2734
2735 # Check for potential 'bare' types
2736                 my ($stat, $cond, $line_nr_next, $remain_next, $off_next,
2737                     $realline_next);
2738 #print "LINE<$line>\n";
2739                 if ($linenr >= $suppress_statement &&
2740                     $realcnt && $sline =~ /.\s*\S/) {
2741                         ($stat, $cond, $line_nr_next, $remain_next, $off_next) =
2742                                 ctx_statement_block($linenr, $realcnt, 0);
2743                         $stat =~ s/\n./\n /g;
2744                         $cond =~ s/\n./\n /g;
2745
2746 #print "linenr<$linenr> <$stat>\n";
2747                         # If this statement has no statement boundaries within
2748                         # it there is no point in retrying a statement scan
2749                         # until we hit end of it.
2750                         my $frag = $stat; $frag =~ s/;+\s*$//;
2751                         if ($frag !~ /(?:{|;)/) {
2752 #print "skip<$line_nr_next>\n";
2753                                 $suppress_statement = $line_nr_next;
2754                         }
2755
2756                         # Find the real next line.
2757                         $realline_next = $line_nr_next;
2758                         if (defined $realline_next &&
2759                             (!defined $lines[$realline_next - 1] ||
2760                              substr($lines[$realline_next - 1], $off_next) =~ /^\s*$/)) {
2761                                 $realline_next++;
2762                         }
2763
2764                         my $s = $stat;
2765                         $s =~ s/{.*$//s;
2766
2767                         # Ignore goto labels.
2768                         if ($s =~ /$Ident:\*$/s) {
2769
2770                         # Ignore functions being called
2771                         } elsif ($s =~ /^.\s*$Ident\s*\(/s) {
2772
2773                         } elsif ($s =~ /^.\s*else\b/s) {
2774
2775                         # declarations always start with types
2776                         } elsif ($prev_values eq 'E' && $s =~ /^.\s*(?:$Storage\s+)?(?:$Inline\s+)?(?:const\s+)?((?:\s*$Ident)+?)\b(?:\s+$Sparse)?\s*\**\s*(?:$Ident|\(\*[^\)]*\))(?:\s*$Modifier)?\s*(?:;|=|,|\()/s) {
2777                                 my $type = $1;
2778                                 $type =~ s/\s+/ /g;
2779                                 possible($type, "A:" . $s);
2780
2781                         # definitions in global scope can only start with types
2782                         } elsif ($s =~ /^.(?:$Storage\s+)?(?:$Inline\s+)?(?:const\s+)?($Ident)\b\s*(?!:)/s) {
2783                                 possible($1, "B:" . $s);
2784                         }
2785
2786                         # any (foo ... *) is a pointer cast, and foo is a type
2787                         while ($s =~ /\(($Ident)(?:\s+$Sparse)*[\s\*]+\s*\)/sg) {
2788                                 possible($1, "C:" . $s);
2789                         }
2790
2791                         # Check for any sort of function declaration.
2792                         # int foo(something bar, other baz);
2793                         # void (*store_gdt)(x86_descr_ptr *);
2794                         if ($prev_values eq 'E' && $s =~ /^(.(?:typedef\s*)?(?:(?:$Storage|$Inline)\s*)*\s*$Type\s*(?:\b$Ident|\(\*\s*$Ident\))\s*)\(/s) {
2795                                 my ($name_len) = length($1);
2796
2797                                 my $ctx = $s;
2798                                 substr($ctx, 0, $name_len + 1, '');
2799                                 $ctx =~ s/\)[^\)]*$//;
2800
2801                                 for my $arg (split(/\s*,\s*/, $ctx)) {
2802                                         if ($arg =~ /^(?:const\s+)?($Ident)(?:\s+$Sparse)*\s*\**\s*(:?\b$Ident)?$/s || $arg =~ /^($Ident)$/s) {
2803
2804                                                 possible($1, "D:" . $s);
2805                                         }
2806                                 }
2807                         }
2808
2809                 }
2810
2811 #
2812 # Checks which may be anchored in the context.
2813 #
2814
2815 # Check for switch () and associated case and default
2816 # statements should be at the same indent.
2817                 if ($line=~/\bswitch\s*\(.*\)/) {
2818                         my $err = '';
2819                         my $sep = '';
2820                         my @ctx = ctx_block_outer($linenr, $realcnt);
2821                         shift(@ctx);
2822                         for my $ctx (@ctx) {
2823                                 my ($clen, $cindent) = line_stats($ctx);
2824                                 if ($ctx =~ /^\+\s*(case\s+|default:)/ &&
2825                                                         $indent != $cindent) {
2826                                         $err .= "$sep$ctx\n";
2827                                         $sep = '';
2828                                 } else {
2829                                         $sep = "[...]\n";
2830                                 }
2831                         }
2832                         if ($err ne '') {
2833                                 ERROR("SWITCH_CASE_INDENT_LEVEL",
2834                                       "switch and case should be at the same indent\n$hereline$err");
2835                         }
2836                 }
2837
2838 # if/while/etc brace do not go on next line, unless defining a do while loop,
2839 # or if that brace on the next line is for something else
2840                 if ($line =~ /(.*)\b((?:if|while|for|switch|(?:[a-z_]+|)for_each[a-z_]+)\s*\(|do\b|else\b)/ && $line !~ /^.\s*\#/) {
2841                         my $pre_ctx = "$1$2";
2842
2843                         my ($level, @ctx) = ctx_statement_level($linenr, $realcnt, 0);
2844
2845                         if ($line =~ /^\+\t{6,}/) {
2846                                 WARN("DEEP_INDENTATION",
2847                                      "Too many leading tabs - consider code refactoring\n" . $herecurr);
2848                         }
2849
2850                         my $ctx_cnt = $realcnt - $#ctx - 1;
2851                         my $ctx = join("\n", @ctx);
2852
2853                         my $ctx_ln = $linenr;
2854                         my $ctx_skip = $realcnt;
2855
2856                         while ($ctx_skip > $ctx_cnt || ($ctx_skip == $ctx_cnt &&
2857                                         defined $lines[$ctx_ln - 1] &&
2858                                         $lines[$ctx_ln - 1] =~ /^-/)) {
2859                                 ##print "SKIP<$ctx_skip> CNT<$ctx_cnt>\n";
2860                                 $ctx_skip-- if (!defined $lines[$ctx_ln - 1] || $lines[$ctx_ln - 1] !~ /^-/);
2861                                 $ctx_ln++;
2862                         }
2863
2864                         #print "realcnt<$realcnt> ctx_cnt<$ctx_cnt>\n";
2865                         #print "pre<$pre_ctx>\nline<$line>\nctx<$ctx>\nnext<$lines[$ctx_ln - 1]>\n";
2866
2867                         if ($ctx !~ /{\s*/ && defined($lines[$ctx_ln - 1]) && $lines[$ctx_ln - 1] =~ /^\+\s*{/) {
2868                                 ERROR("OPEN_BRACE",
2869                                       "that open brace { should be on the previous line\n" .
2870                                         "$here\n$ctx\n$rawlines[$ctx_ln - 1]\n");
2871                         }
2872                         if ($level == 0 && $pre_ctx !~ /}\s*while\s*\($/ &&
2873                             $ctx =~ /\)\s*\;\s*$/ &&
2874                             defined $lines[$ctx_ln - 1])
2875                         {
2876                                 my ($nlength, $nindent) = line_stats($lines[$ctx_ln - 1]);
2877                                 if ($nindent > $indent) {
2878                                         WARN("TRAILING_SEMICOLON",
2879                                              "trailing semicolon indicates no statements, indent implies otherwise\n" .
2880                                                 "$here\n$ctx\n$rawlines[$ctx_ln - 1]\n");
2881                                 }
2882                         }
2883                 }
2884
2885 # Check relative indent for conditionals and blocks.
2886                 if ($line =~ /\b(?:(?:if|while|for|(?:[a-z_]+|)for_each[a-z_]+)\s*\(|do\b)/ && $line !~ /^.\s*#/ && $line !~ /\}\s*while\s*/) {
2887                         ($stat, $cond, $line_nr_next, $remain_next, $off_next) =
2888                                 ctx_statement_block($linenr, $realcnt, 0)
2889                                         if (!defined $stat);
2890                         my ($s, $c) = ($stat, $cond);
2891
2892                         substr($s, 0, length($c), '');
2893
2894                         # Make sure we remove the line prefixes as we have
2895                         # none on the first line, and are going to readd them
2896                         # where necessary.
2897                         $s =~ s/\n./\n/gs;
2898
2899                         # Find out how long the conditional actually is.
2900                         my @newlines = ($c =~ /\n/gs);
2901                         my $cond_lines = 1 + $#newlines;
2902
2903                         # We want to check the first line inside the block
2904                         # starting at the end of the conditional, so remove:
2905                         #  1) any blank line termination
2906                         #  2) any opening brace { on end of the line
2907                         #  3) any do (...) {
2908                         my $continuation = 0;
2909                         my $check = 0;
2910                         $s =~ s/^.*\bdo\b//;
2911                         $s =~ s/^\s*{//;
2912                         if ($s =~ s/^\s*\\//) {
2913                                 $continuation = 1;
2914                         }
2915                         if ($s =~ s/^\s*?\n//) {
2916                                 $check = 1;
2917                                 $cond_lines++;
2918                         }
2919
2920                         # Also ignore a loop construct at the end of a
2921                         # preprocessor statement.
2922                         if (($prevline =~ /^.\s*#\s*define\s/ ||
2923                             $prevline =~ /\\\s*$/) && $continuation == 0) {
2924                                 $check = 0;
2925                         }
2926
2927                         my $cond_ptr = -1;
2928                         $continuation = 0;
2929                         while ($cond_ptr != $cond_lines) {
2930                                 $cond_ptr = $cond_lines;
2931
2932                                 # If we see an #else/#elif then the code
2933                                 # is not linear.
2934                                 if ($s =~ /^\s*\#\s*(?:else|elif)/) {
2935                                         $check = 0;
2936                                 }
2937
2938                                 # Ignore:
2939                                 #  1) blank lines, they should be at 0,
2940                                 #  2) preprocessor lines, and
2941                                 #  3) labels.
2942                                 if ($continuation ||
2943                                     $s =~ /^\s*?\n/ ||
2944                                     $s =~ /^\s*#\s*?/ ||
2945                                     $s =~ /^\s*$Ident\s*:/) {
2946                                         $continuation = ($s =~ /^.*?\\\n/) ? 1 : 0;
2947                                         if ($s =~ s/^.*?\n//) {
2948                                                 $cond_lines++;
2949                                         }
2950                                 }
2951                         }
2952
2953                         my (undef, $sindent) = line_stats("+" . $s);
2954                         my $stat_real = raw_line($linenr, $cond_lines);
2955
2956                         # Check if either of these lines are modified, else
2957                         # this is not this patch's fault.
2958                         if (!defined($stat_real) ||
2959                             $stat !~ /^\+/ && $stat_real !~ /^\+/) {
2960                                 $check = 0;
2961                         }
2962                         if (defined($stat_real) && $cond_lines > 1) {
2963                                 $stat_real = "[...]\n$stat_real";
2964                         }
2965
2966                         #print "line<$line> prevline<$prevline> indent<$indent> sindent<$sindent> check<$check> continuation<$continuation> s<$s> cond_lines<$cond_lines> stat_real<$stat_real> stat<$stat>\n";
2967
2968                         if ($check && (($sindent % 8) != 0 ||
2969                             ($sindent <= $indent && $s ne ''))) {
2970                                 WARN("SUSPECT_CODE_INDENT",
2971                                      "suspect code indent for conditional statements ($indent, $sindent)\n" . $herecurr . "$stat_real\n");
2972                         }
2973                 }
2974
2975                 # Track the 'values' across context and added lines.
2976                 my $opline = $line; $opline =~ s/^./ /;
2977                 my ($curr_values, $curr_vars) =
2978                                 annotate_values($opline . "\n", $prev_values);
2979                 $curr_values = $prev_values . $curr_values;
2980                 if ($dbg_values) {
2981                         my $outline = $opline; $outline =~ s/\t/ /g;
2982                         print "$linenr > .$outline\n";
2983                         print "$linenr > $curr_values\n";
2984                         print "$linenr >  $curr_vars\n";
2985                 }
2986                 $prev_values = substr($curr_values, -1);
2987
2988 #ignore lines not being added
2989                 next if ($line =~ /^[^\+]/);
2990
2991 # TEST: allow direct testing of the type matcher.
2992                 if ($dbg_type) {
2993                         if ($line =~ /^.\s*$Declare\s*$/) {
2994                                 ERROR("TEST_TYPE",
2995                                       "TEST: is type\n" . $herecurr);
2996                         } elsif ($dbg_type > 1 && $line =~ /^.+($Declare)/) {
2997                                 ERROR("TEST_NOT_TYPE",
2998                                       "TEST: is not type ($1 is)\n". $herecurr);
2999                         }
3000                         next;
3001                 }
3002 # TEST: allow direct testing of the attribute matcher.
3003                 if ($dbg_attr) {
3004                         if ($line =~ /^.\s*$Modifier\s*$/) {
3005                                 ERROR("TEST_ATTR",
3006                                       "TEST: is attr\n" . $herecurr);
3007                         } elsif ($dbg_attr > 1 && $line =~ /^.+($Modifier)/) {
3008                                 ERROR("TEST_NOT_ATTR",
3009                                       "TEST: is not attr ($1 is)\n". $herecurr);
3010                         }
3011                         next;
3012                 }
3013
3014 # check for initialisation to aggregates open brace on the next line
3015                 if ($line =~ /^.\s*{/ &&
3016                     $prevline =~ /(?:^|[^=])=\s*$/) {
3017                         if (ERROR("OPEN_BRACE",
3018                                   "that open brace { should be on the previous line\n" . $hereprev) &&
3019                             $fix && $prevline =~ /^\+/ && $line =~ /^\+/) {
3020                                 fix_delete_line($fixlinenr - 1, $prevrawline);
3021                                 fix_delete_line($fixlinenr, $rawline);
3022                                 my $fixedline = $prevrawline;
3023                                 $fixedline =~ s/\s*=\s*$/ = {/;
3024                                 fix_insert_line($fixlinenr, $fixedline);
3025                                 $fixedline = $line;
3026                                 $fixedline =~ s/^(.\s*){\s*/$1/;
3027                                 fix_insert_line($fixlinenr, $fixedline);
3028                         }
3029                 }
3030
3031 #
3032 # Checks which are anchored on the added line.
3033 #
3034
3035 # check for malformed paths in #include statements (uses RAW line)
3036                 if ($rawline =~ m{^.\s*\#\s*include\s+[<"](.*)[">]}) {
3037                         my $path = $1;
3038                         if ($path =~ m{//}) {
3039                                 ERROR("MALFORMED_INCLUDE",
3040                                       "malformed #include filename\n" . $herecurr);
3041                         }
3042                         if ($path =~ "^uapi/" && $realfile =~ m@\binclude/uapi/@) {
3043                                 ERROR("UAPI_INCLUDE",
3044                                       "No #include in ...include/uapi/... should use a uapi/ path prefix\n" . $herecurr);
3045                         }
3046                 }
3047
3048 # no C99 // comments
3049                 if ($line =~ m{//}) {
3050                         if (ERROR("C99_COMMENTS",
3051                                   "do not use C99 // comments\n" . $herecurr) &&
3052                             $fix) {
3053                                 my $line = $fixed[$fixlinenr];
3054                                 if ($line =~ /\/\/(.*)$/) {
3055                                         my $comment = trim($1);
3056                                         $fixed[$fixlinenr] =~ s@\/\/(.*)$@/\* $comment \*/@;
3057                                 }
3058                         }
3059                 }
3060                 # Remove C99 comments.
3061                 $line =~ s@//.*@@;
3062                 $opline =~ s@//.*@@;
3063
3064 # EXPORT_SYMBOL should immediately follow the thing it is exporting, consider
3065 # the whole statement.
3066 #print "APW <$lines[$realline_next - 1]>\n";
3067                 if (defined $realline_next &&
3068                     exists $lines[$realline_next - 1] &&
3069                     !defined $suppress_export{$realline_next} &&
3070                     ($lines[$realline_next - 1] =~ /EXPORT_SYMBOL.*\((.*)\)/ ||
3071                      $lines[$realline_next - 1] =~ /EXPORT_UNUSED_SYMBOL.*\((.*)\)/)) {
3072                         # Handle definitions which produce identifiers with
3073                         # a prefix:
3074                         #   XXX(foo);
3075                         #   EXPORT_SYMBOL(something_foo);
3076                         my $name = $1;
3077                         if ($stat =~ /^(?:.\s*}\s*\n)?.([A-Z_]+)\s*\(\s*($Ident)/ &&
3078                             $name =~ /^${Ident}_$2/) {
3079 #print "FOO C name<$name>\n";
3080                                 $suppress_export{$realline_next} = 1;
3081
3082                         } elsif ($stat !~ /(?:
3083                                 \n.}\s*$|
3084                                 ^.DEFINE_$Ident\(\Q$name\E\)|
3085                                 ^.DECLARE_$Ident\(\Q$name\E\)|
3086                                 ^.LIST_HEAD\(\Q$name\E\)|
3087                                 ^.(?:$Storage\s+)?$Type\s*\(\s*\*\s*\Q$name\E\s*\)\s*\(|
3088                                 \b\Q$name\E(?:\s+$Attribute)*\s*(?:;|=|\[|\()
3089                             )/x) {
3090 #print "FOO A<$lines[$realline_next - 1]> stat<$stat> name<$name>\n";
3091                                 $suppress_export{$realline_next} = 2;
3092                         } else {
3093                                 $suppress_export{$realline_next} = 1;
3094                         }
3095                 }
3096                 if (!defined $suppress_export{$linenr} &&
3097                     $prevline =~ /^.\s*$/ &&
3098                     ($line =~ /EXPORT_SYMBOL.*\((.*)\)/ ||
3099                      $line =~ /EXPORT_UNUSED_SYMBOL.*\((.*)\)/)) {
3100 #print "FOO B <$lines[$linenr - 1]>\n";
3101                         $suppress_export{$linenr} = 2;
3102                 }
3103                 if (defined $suppress_export{$linenr} &&
3104                     $suppress_export{$linenr} == 2) {
3105                         WARN("EXPORT_SYMBOL",
3106                              "EXPORT_SYMBOL(foo); should immediately follow its function/variable\n" . $herecurr);
3107                 }
3108
3109 # check for global initialisers.
3110                 if ($line =~ /^\+(\s*$Type\s*$Ident\s*(?:\s+$Modifier))*\s*=\s*(0|NULL|false)\s*;/) {
3111                         if (ERROR("GLOBAL_INITIALISERS",
3112                                   "do not initialise globals to 0 or NULL\n" .
3113                                       $herecurr) &&
3114                             $fix) {
3115                                 $fixed[$fixlinenr] =~ s/($Type\s*$Ident\s*(?:\s+$Modifier))*\s*=\s*(0|NULL|false)\s*;/$1;/;
3116                         }
3117                 }
3118 # check for static initialisers.
3119                 if ($line =~ /^\+.*\bstatic\s.*=\s*(0|NULL|false)\s*;/) {
3120                         if (ERROR("INITIALISED_STATIC",
3121                                   "do not initialise statics to 0 or NULL\n" .
3122                                       $herecurr) &&
3123                             $fix) {
3124                                 $fixed[$fixlinenr] =~ s/(\bstatic\s.*?)\s*=\s*(0|NULL|false)\s*;/$1;/;
3125                         }
3126                 }
3127
3128 # check for misordered declarations of char/short/int/long with signed/unsigned
3129                 while ($sline =~ m{(\b$TypeMisordered\b)}g) {
3130                         my $tmp = trim($1);
3131                         WARN("MISORDERED_TYPE",
3132                              "type '$tmp' should be specified in [[un]signed] [short|int|long|long long] order\n" . $herecurr);
3133                 }
3134
3135 # check for static const char * arrays.
3136                 if ($line =~ /\bstatic\s+const\s+char\s*\*\s*(\w+)\s*\[\s*\]\s*=\s*/) {
3137                         WARN("STATIC_CONST_CHAR_ARRAY",
3138                              "static const char * array should probably be static const char * const\n" .
3139                                 $herecurr);
3140                }
3141
3142 # check for static char foo[] = "bar" declarations.
3143                 if ($line =~ /\bstatic\s+char\s+(\w+)\s*\[\s*\]\s*=\s*"/) {
3144                         WARN("STATIC_CONST_CHAR_ARRAY",
3145                              "static char array declaration should probably be static const char\n" .
3146                                 $herecurr);
3147                }
3148
3149 # check for non-global char *foo[] = {"bar", ...} declarations.
3150                 if ($line =~ /^.\s+(?:static\s+|const\s+)?char\s+\*\s*\w+\s*\[\s*\]\s*=\s*\{/) {
3151                         WARN("STATIC_CONST_CHAR_ARRAY",
3152                              "char * array declaration might be better as static const\n" .
3153                                 $herecurr);
3154                }
3155
3156 # check for function declarations without arguments like "int foo()"
3157                 if ($line =~ /(\b$Type\s+$Ident)\s*\(\s*\)/) {
3158                         if (ERROR("FUNCTION_WITHOUT_ARGS",
3159                                   "Bad function definition - $1() should probably be $1(void)\n" . $herecurr) &&
3160                             $fix) {
3161                                 $fixed[$fixlinenr] =~ s/(\b($Type)\s+($Ident))\s*\(\s*\)/$2 $3(void)/;
3162                         }
3163                 }
3164
3165 # check for uses of DEFINE_PCI_DEVICE_TABLE
3166                 if ($line =~ /\bDEFINE_PCI_DEVICE_TABLE\s*\(\s*(\w+)\s*\)\s*=/) {
3167                         if (WARN("DEFINE_PCI_DEVICE_TABLE",
3168                                  "Prefer struct pci_device_id over deprecated DEFINE_PCI_DEVICE_TABLE\n" . $herecurr) &&
3169                             $fix) {
3170                                 $fixed[$fixlinenr] =~ s/\b(?:static\s+|)DEFINE_PCI_DEVICE_TABLE\s*\(\s*(\w+)\s*\)\s*=\s*/static const struct pci_device_id $1\[\] = /;
3171                         }
3172                 }
3173
3174 # check for new typedefs, only function parameters and sparse annotations
3175 # make sense.
3176                 if ($line =~ /\btypedef\s/ &&
3177                     $line !~ /\btypedef\s+$Type\s*\(\s*\*?$Ident\s*\)\s*\(/ &&
3178                     $line !~ /\btypedef\s+$Type\s+$Ident\s*\(/ &&
3179                     $line !~ /\b$typeTypedefs\b/ &&
3180                     $line !~ /\b$typeOtherOSTypedefs\b/ &&
3181                     $line !~ /\b__bitwise(?:__|)\b/) {
3182                         WARN("NEW_TYPEDEFS",
3183                              "do not add new typedefs\n" . $herecurr);
3184                 }
3185
3186 # * goes on variable not on type
3187                 # (char*[ const])
3188                 while ($line =~ m{(\($NonptrType(\s*(?:$Modifier\b\s*|\*\s*)+)\))}g) {
3189                         #print "AA<$1>\n";
3190                         my ($ident, $from, $to) = ($1, $2, $2);
3191
3192                         # Should start with a space.
3193                         $to =~ s/^(\S)/ $1/;
3194                         # Should not end with a space.
3195                         $to =~ s/\s+$//;
3196                         # '*'s should not have spaces between.
3197                         while ($to =~ s/\*\s+\*/\*\*/) {
3198                         }
3199
3200 ##                      print "1: from<$from> to<$to> ident<$ident>\n";
3201                         if ($from ne $to) {
3202                                 if (ERROR("POINTER_LOCATION",
3203                                           "\"(foo$from)\" should be \"(foo$to)\"\n" .  $herecurr) &&
3204                                     $fix) {
3205                                         my $sub_from = $ident;
3206                                         my $sub_to = $ident;
3207                                         $sub_to =~ s/\Q$from\E/$to/;
3208                                         $fixed[$fixlinenr] =~
3209                                             s@\Q$sub_from\E@$sub_to@;
3210                                 }
3211                         }
3212                 }
3213                 while ($line =~ m{(\b$NonptrType(\s*(?:$Modifier\b\s*|\*\s*)+)($Ident))}g) {
3214                         #print "BB<$1>\n";
3215                         my ($match, $from, $to, $ident) = ($1, $2, $2, $3);
3216
3217                         # Should start with a space.
3218                         $to =~ s/^(\S)/ $1/;
3219                         # Should not end with a space.
3220                         $to =~ s/\s+$//;
3221                         # '*'s should not have spaces between.
3222                         while ($to =~ s/\*\s+\*/\*\*/) {
3223                         }
3224                         # Modifiers should have spaces.
3225                         $to =~ s/(\b$Modifier$)/$1 /;
3226
3227 ##                      print "2: from<$from> to<$to> ident<$ident>\n";
3228                         if ($from ne $to && $ident !~ /^$Modifier$/) {
3229                                 if (ERROR("POINTER_LOCATION",
3230                                           "\"foo${from}bar\" should be \"foo${to}bar\"\n" .  $herecurr) &&
3231                                     $fix) {
3232
3233                                         my $sub_from = $match;
3234                                         my $sub_to = $match;
3235                                         $sub_to =~ s/\Q$from\E/$to/;
3236                                         $fixed[$fixlinenr] =~
3237                                             s@\Q$sub_from\E@$sub_to@;
3238                                 }
3239                         }
3240                 }
3241
3242 # # no BUG() or BUG_ON()
3243 #               if ($line =~ /\b(BUG|BUG_ON)\b/) {
3244 #                       print "Try to use WARN_ON & Recovery code rather than BUG() or BUG_ON()\n";
3245 #                       print "$herecurr";
3246 #                       $clean = 0;
3247 #               }
3248
3249                 if ($line =~ /\bLINUX_VERSION_CODE\b/) {
3250                         WARN("LINUX_VERSION_CODE",
3251                              "LINUX_VERSION_CODE should be avoided, code should be for the version to which it is merged\n" . $herecurr);
3252                 }
3253
3254 # check for uses of printk_ratelimit
3255                 if ($line =~ /\bprintk_ratelimit\s*\(/) {
3256                         WARN("PRINTK_RATELIMITED",
3257                              "Prefer printk_ratelimited or pr_<level>_ratelimited to printk_ratelimit\n" . $herecurr);
3258                 }
3259
3260 # printk should use KERN_* levels.  Note that follow on printk's on the
3261 # same line do not need a level, so we use the current block context
3262 # to try and find and validate the current printk.  In summary the current
3263 # printk includes all preceding printk's which have no newline on the end.
3264 # we assume the first bad printk is the one to report.
3265                 if ($line =~ /\bprintk\((?!KERN_)\s*"/) {
3266                         my $ok = 0;
3267                         for (my $ln = $linenr - 1; $ln >= $first_line; $ln--) {
3268                                 #print "CHECK<$lines[$ln - 1]\n";
3269                                 # we have a preceding printk if it ends
3270                                 # with "\n" ignore it, else it is to blame
3271                                 if ($lines[$ln - 1] =~ m{\bprintk\(}) {
3272                                         if ($rawlines[$ln - 1] !~ m{\\n"}) {
3273                                                 $ok = 1;
3274                                         }
3275                                         last;
3276                                 }
3277                         }
3278                         if ($ok == 0) {
3279                                 WARN("PRINTK_WITHOUT_KERN_LEVEL",
3280                                      "printk() should include KERN_ facility level\n" . $herecurr);
3281                         }
3282                 }
3283
3284                 if ($line =~ /\bprintk\s*\(\s*KERN_([A-Z]+)/) {
3285                         my $orig = $1;
3286                         my $level = lc($orig);
3287                         $level = "warn" if ($level eq "warning");
3288                         my $level2 = $level;
3289                         $level2 = "dbg" if ($level eq "debug");
3290                         WARN("PREFER_PR_LEVEL",
3291                              "Prefer [subsystem eg: netdev]_$level2([subsystem]dev, ... then dev_$level2(dev, ... then pr_$level(...  to printk(KERN_$orig ...\n" . $herecurr);
3292                 }
3293
3294                 if ($line =~ /\bpr_warning\s*\(/) {
3295                         if (WARN("PREFER_PR_LEVEL",
3296                                  "Prefer pr_warn(... to pr_warning(...\n" . $herecurr) &&
3297                             $fix) {
3298                                 $fixed[$fixlinenr] =~
3299                                     s/\bpr_warning\b/pr_warn/;
3300                         }
3301                 }
3302
3303                 if ($line =~ /\bdev_printk\s*\(\s*KERN_([A-Z]+)/) {
3304                         my $orig = $1;
3305                         my $level = lc($orig);
3306                         $level = "warn" if ($level eq "warning");
3307                         $level = "dbg" if ($level eq "debug");
3308                         WARN("PREFER_DEV_LEVEL",
3309                              "Prefer dev_$level(... to dev_printk(KERN_$orig, ...\n" . $herecurr);
3310                 }
3311
3312 # function brace can't be on same line, except for #defines of do while,
3313 # or if closed on same line
3314                 if (($line=~/$Type\s*$Ident\(.*\).*\s*{/) and
3315                     !($line=~/\#\s*define.*do\s{/) and !($line=~/}/)) {
3316                         if (ERROR("OPEN_BRACE",
3317                                   "open brace '{' following function declarations go on the next line\n" . $herecurr) &&
3318                             $fix) {
3319                                 fix_delete_line($fixlinenr, $rawline);
3320                                 my $fixed_line = $rawline;
3321                                 $fixed_line =~ /(^..*$Type\s*$Ident\(.*\)\s*){(.*)$/;
3322                                 my $line1 = $1;
3323                                 my $line2 = $2;
3324                                 fix_insert_line($fixlinenr, ltrim($line1));
3325                                 fix_insert_line($fixlinenr, "\+{");
3326                                 if ($line2 !~ /^\s*$/) {
3327                                         fix_insert_line($fixlinenr, "\+\t" . trim($line2));
3328                                 }
3329                         }
3330                 }
3331
3332 # open braces for enum, union and struct go on the same line.
3333                 if ($line =~ /^.\s*{/ &&
3334                     $prevline =~ /^.\s*(?:typedef\s+)?(enum|union|struct)(?:\s+$Ident)?\s*$/) {
3335                         if (ERROR("OPEN_BRACE",
3336                                   "open brace '{' following $1 go on the same line\n" . $hereprev) &&
3337                             $fix && $prevline =~ /^\+/ && $line =~ /^\+/) {
3338                                 fix_delete_line($fixlinenr - 1, $prevrawline);
3339                                 fix_delete_line($fixlinenr, $rawline);
3340                                 my $fixedline = rtrim($prevrawline) . " {";
3341                                 fix_insert_line($fixlinenr, $fixedline);
3342                                 $fixedline = $rawline;
3343                                 $fixedline =~ s/^(.\s*){\s*/$1\t/;
3344                                 if ($fixedline !~ /^\+\s*$/) {
3345                                         fix_insert_line($fixlinenr, $fixedline);
3346                                 }
3347                         }
3348                 }
3349
3350 # missing space after union, struct or enum definition
3351                 if ($line =~ /^.\s*(?:typedef\s+)?(enum|union|struct)(?:\s+$Ident){1,2}[=\{]/) {
3352                         if (WARN("SPACING",
3353                                  "missing space after $1 definition\n" . $herecurr) &&
3354                             $fix) {
3355                                 $fixed[$fixlinenr] =~
3356                                     s/^(.\s*(?:typedef\s+)?(?:enum|union|struct)(?:\s+$Ident){1,2})([=\{])/$1 $2/;
3357                         }
3358                 }
3359
3360 # Function pointer declarations
3361 # check spacing between type, funcptr, and args
3362 # canonical declaration is "type (*funcptr)(args...)"
3363                 if ($line =~ /^.\s*($Declare)\((\s*)\*(\s*)($Ident)(\s*)\)(\s*)\(/) {
3364                         my $declare = $1;
3365                         my $pre_pointer_space = $2;
3366                         my $post_pointer_space = $3;
3367                         my $funcname = $4;
3368                         my $post_funcname_space = $5;
3369                         my $pre_args_space = $6;
3370
3371 # the $Declare variable will capture all spaces after the type
3372 # so check it for a missing trailing missing space but pointer return types
3373 # don't need a space so don't warn for those.
3374                         my $post_declare_space = "";
3375                         if ($declare =~ /(\s+)$/) {
3376                                 $post_declare_space = $1;
3377                                 $declare = rtrim($declare);
3378                         }
3379                         if ($declare !~ /\*$/ && $post_declare_space =~ /^$/) {
3380                                 WARN("SPACING",
3381                                      "missing space after return type\n" . $herecurr);
3382                                 $post_declare_space = " ";
3383                         }
3384
3385 # unnecessary space "type  (*funcptr)(args...)"
3386 # This test is not currently implemented because these declarations are
3387 # equivalent to
3388 #       int  foo(int bar, ...)
3389 # and this is form shouldn't/doesn't generate a checkpatch warning.
3390 #
3391 #                       elsif ($declare =~ /\s{2,}$/) {
3392 #                               WARN("SPACING",
3393 #                                    "Multiple spaces after return type\n" . $herecurr);
3394 #                       }
3395
3396 # unnecessary space "type ( *funcptr)(args...)"
3397                         if (defined $pre_pointer_space &&
3398                             $pre_pointer_space =~ /^\s/) {
3399                                 WARN("SPACING",
3400                                      "Unnecessary space after function pointer open parenthesis\n" . $herecurr);
3401                         }
3402
3403 # unnecessary space "type (* funcptr)(args...)"
3404                         if (defined $post_pointer_space &&
3405                             $post_pointer_space =~ /^\s/) {
3406                                 WARN("SPACING",
3407                                      "Unnecessary space before function pointer name\n" . $herecurr);
3408                         }
3409
3410 # unnecessary space "type (*funcptr )(args...)"
3411                         if (defined $post_funcname_space &&
3412                             $post_funcname_space =~ /^\s/) {
3413                                 WARN("SPACING",
3414                                      "Unnecessary space after function pointer name\n" . $herecurr);
3415                         }
3416
3417 # unnecessary space "type (*funcptr) (args...)"
3418                         if (defined $pre_args_space &&
3419                             $pre_args_space =~ /^\s/) {
3420                                 WARN("SPACING",
3421                                      "Unnecessary space before function pointer arguments\n" . $herecurr);
3422                         }
3423
3424                         if (show_type("SPACING") && $fix) {
3425                                 $fixed[$fixlinenr] =~
3426                                     s/^(.\s*)$Declare\s*\(\s*\*\s*$Ident\s*\)\s*\(/$1 . $declare . $post_declare_space . '(*' . $funcname . ')('/ex;
3427                         }
3428                 }
3429
3430 # check for spacing round square brackets; allowed:
3431 #  1. with a type on the left -- int [] a;
3432 #  2. at the beginning of a line for slice initialisers -- [0...10] = 5,
3433 #  3. inside a curly brace -- = { [0...10] = 5 }
3434                 while ($line =~ /(.*?\s)\[/g) {
3435                         my ($where, $prefix) = ($-[1], $1);
3436                         if ($prefix !~ /$Type\s+$/ &&
3437                             ($where != 0 || $prefix !~ /^.\s+$/) &&
3438                             $prefix !~ /[{,]\s+$/) {
3439                                 if (ERROR("BRACKET_SPACE",
3440                                           "space prohibited before open square bracket '['\n" . $herecurr) &&
3441                                     $fix) {
3442                                     $fixed[$fixlinenr] =~
3443                                         s/^(\+.*?)\s+\[/$1\[/;
3444                                 }
3445                         }
3446                 }
3447
3448 # check for spaces between functions and their parentheses.
3449                 while ($line =~ /($Ident)\s+\(/g) {
3450                         my $name = $1;
3451                         my $ctx_before = substr($line, 0, $-[1]);
3452                         my $ctx = "$ctx_before$name";
3453
3454                         # Ignore those directives where spaces _are_ permitted.
3455                         if ($name =~ /^(?:
3456                                 if|for|while|switch|return|case|
3457                                 volatile|__volatile__|
3458                                 __attribute__|format|__extension__|
3459                                 asm|__asm__)$/x)
3460                         {
3461                         # cpp #define statements have non-optional spaces, ie
3462                         # if there is a space between the name and the open
3463                         # parenthesis it is simply not a parameter group.
3464                         } elsif ($ctx_before =~ /^.\s*\#\s*define\s*$/) {
3465
3466                         # cpp #elif statement condition may start with a (
3467                         } elsif ($ctx =~ /^.\s*\#\s*elif\s*$/) {
3468
3469                         # If this whole things ends with a type its most
3470                         # likely a typedef for a function.
3471                         } elsif ($ctx =~ /$Type$/) {
3472
3473                         } else {
3474                                 if (WARN("SPACING",
3475                                          "space prohibited between function name and open parenthesis '('\n" . $herecurr) &&
3476                                              $fix) {
3477                                         $fixed[$fixlinenr] =~
3478                                             s/\b$name\s+\(/$name\(/;
3479                                 }
3480                         }
3481                 }
3482
3483 # Check operator spacing.
3484                 if (!($line=~/\#\s*include/)) {
3485                         my $fixed_line = "";
3486                         my $line_fixed = 0;
3487
3488                         my $ops = qr{
3489                                 <<=|>>=|<=|>=|==|!=|
3490                                 \+=|-=|\*=|\/=|%=|\^=|\|=|&=|
3491                                 =>|->|<<|>>|<|>|=|!|~|
3492                                 &&|\|\||,|\^|\+\+|--|&|\||\+|-|\*|\/|%|
3493                                 \?:|\?|:
3494                         }x;
3495                         my @elements = split(/($ops|;)/, $opline);
3496
3497 ##                      print("element count: <" . $#elements . ">\n");
3498 ##                      foreach my $el (@elements) {
3499 ##                              print("el: <$el>\n");
3500 ##                      }
3501
3502                         my @fix_elements = ();
3503                         my $off = 0;
3504
3505                         foreach my $el (@elements) {
3506                                 push(@fix_elements, substr($rawline, $off, length($el)));
3507                                 $off += length($el);
3508                         }
3509
3510                         $off = 0;
3511
3512                         my $blank = copy_spacing($opline);
3513                         my $last_after = -1;
3514
3515                         for (my $n = 0; $n < $#elements; $n += 2) {
3516
3517                                 my $good = $fix_elements[$n] . $fix_elements[$n + 1];
3518
3519 ##                              print("n: <$n> good: <$good>\n");
3520
3521                                 $off += length($elements[$n]);
3522
3523                                 # Pick up the preceding and succeeding characters.
3524                                 my $ca = substr($opline, 0, $off);
3525                                 my $cc = '';
3526                                 if (length($opline) >= ($off + length($elements[$n + 1]))) {
3527                                         $cc = substr($opline, $off + length($elements[$n + 1]));
3528                                 }
3529                                 my $cb = "$ca$;$cc";
3530
3531                                 my $a = '';
3532                                 $a = 'V' if ($elements[$n] ne '');
3533                                 $a = 'W' if ($elements[$n] =~ /\s$/);
3534                                 $a = 'C' if ($elements[$n] =~ /$;$/);
3535                                 $a = 'B' if ($elements[$n] =~ /(\[|\()$/);
3536                                 $a = 'O' if ($elements[$n] eq '');
3537                                 $a = 'E' if ($ca =~ /^\s*$/);
3538
3539                                 my $op = $elements[$n + 1];
3540
3541                                 my $c = '';
3542                                 if (defined $elements[$n + 2]) {
3543                                         $c = 'V' if ($elements[$n + 2] ne '');
3544                                         $c = 'W' if ($elements[$n + 2] =~ /^\s/);
3545                                         $c = 'C' if ($elements[$n + 2] =~ /^$;/);
3546                                         $c = 'B' if ($elements[$n + 2] =~ /^(\)|\]|;)/);
3547                                         $c = 'O' if ($elements[$n + 2] eq '');
3548                                         $c = 'E' if ($elements[$n + 2] =~ /^\s*\\$/);
3549                                 } else {
3550                                         $c = 'E';
3551                                 }
3552
3553                                 my $ctx = "${a}x${c}";
3554
3555                                 my $at = "(ctx:$ctx)";
3556
3557                                 my $ptr = substr($blank, 0, $off) . "^";
3558                                 my $hereptr = "$hereline$ptr\n";
3559
3560                                 # Pull out the value of this operator.
3561                                 my $op_type = substr($curr_values, $off + 1, 1);
3562
3563                                 # Get the full operator variant.
3564                                 my $opv = $op . substr($curr_vars, $off, 1);
3565
3566                                 # Ignore operators passed as parameters.
3567                                 if ($op_type ne 'V' &&
3568                                     $ca =~ /\s$/ && $cc =~ /^\s*,/) {
3569
3570 #                               # Ignore comments
3571 #                               } elsif ($op =~ /^$;+$/) {
3572
3573                                 # ; should have either the end of line or a space or \ after it
3574                                 } elsif ($op eq ';') {
3575                                         if ($ctx !~ /.x[WEBC]/ &&
3576                                             $cc !~ /^\\/ && $cc !~ /^;/) {
3577                                                 if (ERROR("SPACING",
3578                                                           "space required after that '$op' $at\n" . $hereptr)) {
3579                                                         $good = $fix_elements[$n] . trim($fix_elements[$n + 1]) . " ";
3580                                                         $line_fixed = 1;
3581                                                 }
3582                                         }
3583
3584                                 # // is a comment
3585                                 } elsif ($op eq '//') {
3586
3587                                 #   :   when part of a bitfield
3588                                 } elsif ($opv eq ':B') {
3589                                         # skip the bitfield test for now
3590
3591                                 # No spaces for:
3592                                 #   ->
3593                                 } elsif ($op eq '->') {
3594                                         if ($ctx =~ /Wx.|.xW/) {
3595                                                 if (ERROR("SPACING",
3596                                                           "spaces prohibited around that '$op' $at\n" . $hereptr)) {
3597                                                         $good = rtrim($fix_elements[$n]) . trim($fix_elements[$n + 1]);
3598                                                         if (defined $fix_elements[$n + 2]) {
3599                                                                 $fix_elements[$n + 2] =~ s/^\s+//;
3600                                                         }
3601                                                         $line_fixed = 1;
3602                                                 }
3603                                         }
3604
3605                                 # , must not have a space before and must have a space on the right.
3606                                 } elsif ($op eq ',') {
3607                                         my $rtrim_before = 0;
3608                                         my $space_after = 0;
3609                                         if ($ctx =~ /Wx./) {
3610                                                 if (ERROR("SPACING",
3611                                                           "space prohibited before that '$op' $at\n" . $hereptr)) {
3612                                                         $line_fixed = 1;
3613                                                         $rtrim_before = 1;
3614                                                 }
3615                                         }
3616                                         if ($ctx !~ /.x[WEC]/ && $cc !~ /^}/) {
3617                                                 if (ERROR("SPACING",
3618                                                           "space required after that '$op' $at\n" . $hereptr)) {
3619                                                         $line_fixed = 1;
3620                                                         $last_after = $n;
3621                                                         $space_after = 1;
3622                                                 }
3623                                         }
3624                                         if ($rtrim_before || $space_after) {
3625                                                 if ($rtrim_before) {
3626                                                         $good = rtrim($fix_elements[$n]) . trim($fix_elements[$n + 1]);
3627                                                 } else {
3628                                                         $good = $fix_elements[$n] . trim($fix_elements[$n + 1]);
3629                                                 }
3630                                                 if ($space_after) {
3631                                                         $good .= " ";
3632                                                 }
3633                                         }
3634
3635                                 # '*' as part of a type definition -- reported already.
3636                                 } elsif ($opv eq '*_') {
3637                                         #warn "'*' is part of type\n";
3638
3639                                 # unary operators should have a space before and
3640                                 # none after.  May be left adjacent to another
3641                                 # unary operator, or a cast
3642                                 } elsif ($op eq '!' || $op eq '~' ||
3643                                          $opv eq '*U' || $opv eq '-U' ||
3644                                          $opv eq '&U' || $opv eq '&&U') {
3645                                         if ($ctx !~ /[WEBC]x./ && $ca !~ /(?:\)|!|~|\*|-|\&|\||\+\+|\-\-|\{)$/) {
3646                                                 if (ERROR("SPACING",
3647                                                           "space required before that '$op' $at\n" . $hereptr)) {
3648                                                         if ($n != $last_after + 2) {
3649                                                                 $good = $fix_elements[$n] . " " . ltrim($fix_elements[$n + 1]);
3650                                                                 $line_fixed = 1;
3651                                                         }
3652                                                 }
3653                                         }
3654                                         if ($op eq '*' && $cc =~/\s*$Modifier\b/) {
3655                                                 # A unary '*' may be const
3656
3657                                         } elsif ($ctx =~ /.xW/) {
3658                                                 if (ERROR("SPACING",
3659                                                           "space prohibited after that '$op' $at\n" . $hereptr)) {
3660                                                         $good = $fix_elements[$n] . rtrim($fix_elements[$n + 1]);
3661                                                         if (defined $fix_elements[$n + 2]) {
3662                                                                 $fix_elements[$n + 2] =~ s/^\s+//;
3663                                                         }
3664                                                         $line_fixed = 1;
3665                                                 }
3666                                         }
3667
3668                                 # unary ++ and unary -- are allowed no space on one side.
3669                                 } elsif ($op eq '++' or $op eq '--') {
3670                                         if ($ctx !~ /[WEOBC]x[^W]/ && $ctx !~ /[^W]x[WOBEC]/) {
3671                                                 if (ERROR("SPACING",
3672                                                           "space required one side of that '$op' $at\n" . $hereptr)) {
3673                                                         $good = $fix_elements[$n] . trim($fix_elements[$n + 1]) . " ";
3674                                                         $line_fixed = 1;
3675                                                 }
3676                                         }
3677                                         if ($ctx =~ /Wx[BE]/ ||
3678                                             ($ctx =~ /Wx./ && $cc =~ /^;/)) {
3679                                                 if (ERROR("SPACING",
3680                                                           "space prohibited before that '$op' $at\n" . $hereptr)) {
3681                                                         $good = rtrim($fix_elements[$n]) . trim($fix_elements[$n + 1]);
3682                                                         $line_fixed = 1;
3683                                                 }
3684                                         }
3685                                         if ($ctx =~ /ExW/) {
3686                                                 if (ERROR("SPACING",
3687                                                           "space prohibited after that '$op' $at\n" . $hereptr)) {
3688                                                         $good = $fix_elements[$n] . trim($fix_elements[$n + 1]);
3689                                                         if (defined $fix_elements[$n + 2]) {
3690                                                                 $fix_elements[$n + 2] =~ s/^\s+//;
3691                                                         }
3692                                                         $line_fixed = 1;
3693                                                 }
3694                                         }
3695
3696                                 # << and >> may either have or not have spaces both sides
3697                                 } elsif ($op eq '<<' or $op eq '>>' or
3698                                          $op eq '&' or $op eq '^' or $op eq '|' or
3699                                          $op eq '+' or $op eq '-' or
3700                                          $op eq '*' or $op eq '/' or
3701                                          $op eq '%')
3702                                 {
3703                                         if ($check) {
3704                                                 if (defined $fix_elements[$n + 2] && $ctx !~ /[EW]x[EW]/) {
3705                                                         if (CHK("SPACING",
3706                                                                 "spaces preferred around that '$op' $at\n" . $hereptr)) {
3707                                                                 $good = rtrim($fix_elements[$n]) . " " . trim($fix_elements[$n + 1]) . " ";
3708                                                                 $fix_elements[$n + 2] =~ s/^\s+//;
3709                                                                 $line_fixed = 1;
3710                                                         }
3711                                                 } elsif (!defined $fix_elements[$n + 2] && $ctx !~ /Wx[OE]/) {
3712                                                         if (CHK("SPACING",
3713                                                                 "space preferred before that '$op' $at\n" . $hereptr)) {
3714                                                                 $good = rtrim($fix_elements[$n]) . " " . trim($fix_elements[$n + 1]);
3715                                                                 $line_fixed = 1;
3716                                                         }
3717                                                 }
3718                                         } elsif ($ctx =~ /Wx[^WCE]|[^WCE]xW/) {
3719                                                 if (ERROR("SPACING",
3720                                                           "need consistent spacing around '$op' $at\n" . $hereptr)) {
3721                                                         $good = rtrim($fix_elements[$n]) . " " . trim($fix_elements[$n + 1]) . " ";
3722                                                         if (defined $fix_elements[$n + 2]) {
3723                                                                 $fix_elements[$n + 2] =~ s/^\s+//;
3724                                                         }
3725                                                         $line_fixed = 1;
3726                                                 }
3727                                         }
3728
3729                                 # A colon needs no spaces before when it is
3730                                 # terminating a case value or a label.
3731                                 } elsif ($opv eq ':C' || $opv eq ':L') {
3732                                         if ($ctx =~ /Wx./) {
3733                                                 if (ERROR("SPACING",
3734                                                           "space prohibited before that '$op' $at\n" . $hereptr)) {
3735                                                         $good = rtrim($fix_elements[$n]) . trim($fix_elements[$n + 1]);
3736                                                         $line_fixed = 1;
3737                                                 }
3738                                         }
3739
3740                                 # All the others need spaces both sides.
3741                                 } elsif ($ctx !~ /[EWC]x[CWE]/) {
3742                                         my $ok = 0;
3743
3744                                         # Ignore email addresses <foo@bar>
3745                                         if (($op eq '<' &&
3746                                              $cc =~ /^\S+\@\S+>/) ||
3747                                             ($op eq '>' &&
3748                                              $ca =~ /<\S+\@\S+$/))
3749                                         {
3750                                                 $ok = 1;
3751                                         }
3752
3753                                         # messages are ERROR, but ?: are CHK
3754                                         if ($ok == 0) {
3755                                                 my $msg_type = \&ERROR;
3756                                                 $msg_type = \&CHK if (($op eq '?:' || $op eq '?' || $op eq ':') && $ctx =~ /VxV/);
3757
3758                                                 if (&{$msg_type}("SPACING",
3759                                                                  "spaces required around that '$op' $at\n" . $hereptr)) {
3760                                                         $good = rtrim($fix_elements[$n]) . " " . trim($fix_elements[$n + 1]) . " ";
3761                                                         if (defined $fix_elements[$n + 2]) {
3762                                                                 $fix_elements[$n + 2] =~ s/^\s+//;
3763                                                         }
3764                                                         $line_fixed = 1;
3765                                                 }
3766                                         }
3767                                 }
3768                                 $off += length($elements[$n + 1]);
3769
3770 ##                              print("n: <$n> GOOD: <$good>\n");
3771
3772                                 $fixed_line = $fixed_line . $good;
3773                         }
3774
3775                         if (($#elements % 2) == 0) {
3776                                 $fixed_line = $fixed_line . $fix_elements[$#elements];
3777                         }
3778
3779                         if ($fix && $line_fixed && $fixed_line ne $fixed[$fixlinenr]) {
3780                                 $fixed[$fixlinenr] = $fixed_line;
3781                         }
3782
3783
3784                 }
3785
3786 # check for whitespace before a non-naked semicolon
3787                 if ($line =~ /^\+.*\S\s+;\s*$/) {
3788                         if (WARN("SPACING",
3789                                  "space prohibited before semicolon\n" . $herecurr) &&
3790                             $fix) {
3791                                 1 while $fixed[$fixlinenr] =~
3792                                     s/^(\+.*\S)\s+;/$1;/;
3793                         }
3794                 }
3795
3796 # check for multiple assignments
3797                 if ($line =~ /^.\s*$Lval\s*=\s*$Lval\s*=(?!=)/) {
3798                         CHK("MULTIPLE_ASSIGNMENTS",
3799                             "multiple assignments should be avoided\n" . $herecurr);
3800                 }
3801
3802 ## # check for multiple declarations, allowing for a function declaration
3803 ## # continuation.
3804 ##              if ($line =~ /^.\s*$Type\s+$Ident(?:\s*=[^,{]*)?\s*,\s*$Ident.*/ &&
3805 ##                  $line !~ /^.\s*$Type\s+$Ident(?:\s*=[^,{]*)?\s*,\s*$Type\s*$Ident.*/) {
3806 ##
3807 ##                      # Remove any bracketed sections to ensure we do not
3808 ##                      # falsly report the parameters of functions.
3809 ##                      my $ln = $line;
3810 ##                      while ($ln =~ s/\([^\(\)]*\)//g) {
3811 ##                      }
3812 ##                      if ($ln =~ /,/) {
3813 ##                              WARN("MULTIPLE_DECLARATION",
3814 ##                                   "declaring multiple variables together should be avoided\n" . $herecurr);
3815 ##                      }
3816 ##              }
3817
3818 #need space before brace following if, while, etc
3819                 if (($line =~ /\(.*\){/ && $line !~ /\($Type\){/) ||
3820                     $line =~ /do{/) {
3821                         if (ERROR("SPACING",
3822                                   "space required before the open brace '{'\n" . $herecurr) &&
3823                             $fix) {
3824                                 $fixed[$fixlinenr] =~ s/^(\+.*(?:do|\))){/$1 {/;
3825                         }
3826                 }
3827
3828 ## # check for blank lines before declarations
3829 ##              if ($line =~ /^.\t+$Type\s+$Ident(?:\s*=.*)?;/ &&
3830 ##                  $prevrawline =~ /^.\s*$/) {
3831 ##                      WARN("SPACING",
3832 ##                           "No blank lines before declarations\n" . $hereprev);
3833 ##              }
3834 ##
3835
3836 # closing brace should have a space following it when it has anything
3837 # on the line
3838                 if ($line =~ /}(?!(?:,|;|\)))\S/) {
3839                         if (ERROR("SPACING",
3840                                   "space required after that close brace '}'\n" . $herecurr) &&
3841                             $fix) {
3842                                 $fixed[$fixlinenr] =~
3843                                     s/}((?!(?:,|;|\)))\S)/} $1/;
3844                         }
3845                 }
3846
3847 # check spacing on square brackets
3848                 if ($line =~ /\[\s/ && $line !~ /\[\s*$/) {
3849                         if (ERROR("SPACING",
3850                                   "space prohibited after that open square bracket '['\n" . $herecurr) &&
3851                             $fix) {
3852                                 $fixed[$fixlinenr] =~
3853                                     s/\[\s+/\[/;
3854                         }
3855                 }
3856                 if ($line =~ /\s\]/) {
3857                         if (ERROR("SPACING",
3858                                   "space prohibited before that close square bracket ']'\n" . $herecurr) &&
3859                             $fix) {
3860                                 $fixed[$fixlinenr] =~
3861                                     s/\s+\]/\]/;
3862                         }
3863                 }
3864
3865 # check spacing on parentheses
3866                 if ($line =~ /\(\s/ && $line !~ /\(\s*(?:\\)?$/ &&
3867                     $line !~ /for\s*\(\s+;/) {
3868                         if (ERROR("SPACING",
3869                                   "space prohibited after that open parenthesis '('\n" . $herecurr) &&
3870                             $fix) {
3871                                 $fixed[$fixlinenr] =~
3872                                     s/\(\s+/\(/;
3873                         }
3874                 }
3875                 if ($line =~ /(\s+)\)/ && $line !~ /^.\s*\)/ &&
3876                     $line !~ /for\s*\(.*;\s+\)/ &&
3877                     $line !~ /:\s+\)/) {
3878                         if (ERROR("SPACING",
3879                                   "space prohibited before that close parenthesis ')'\n" . $herecurr) &&
3880                             $fix) {
3881                                 $fixed[$fixlinenr] =~
3882                                     s/\s+\)/\)/;
3883                         }
3884                 }
3885
3886 # check unnecessary parentheses around addressof/dereference single $Lvals
3887 # ie: &(foo->bar) should be &foo->bar and *(foo->bar) should be *foo->bar
3888
3889                 while ($line =~ /(?:[^&]&\s*|\*)\(\s*($Ident\s*(?:$Member\s*)+)\s*\)/g) {
3890                         my $var = $1;
3891                         if (CHK("UNNECESSARY_PARENTHESES",
3892                                 "Unnecessary parentheses around $var\n" . $herecurr) &&
3893                             $fix) {
3894                                 $fixed[$fixlinenr] =~ s/\(\s*\Q$var\E\s*\)/$var/;
3895                         }
3896                 }
3897
3898 # check for unnecessary parentheses around function pointer uses
3899 # ie: (foo->bar)(); should be foo->bar();
3900 # but not "if (foo->bar) (" to avoid some false positives
3901                 if ($line =~ /(\bif\s*|)(\(\s*$Ident\s*(?:$Member\s*)+\))[ \t]*\(/ && $1 !~ /^if/) {
3902                         my $var = $2;
3903                         if (CHK("UNNECESSARY_PARENTHESES",
3904                                 "Unnecessary parentheses around function pointer $var\n" . $herecurr) &&
3905                             $fix) {
3906                                 my $var2 = deparenthesize($var);
3907                                 $var2 =~ s/\s//g;
3908                                 $fixed[$fixlinenr] =~ s/\Q$var\E/$var2/;
3909                         }
3910                 }
3911
3912 #goto labels aren't indented, allow a single space however
3913                 if ($line=~/^.\s+[A-Za-z\d_]+:(?![0-9]+)/ and
3914                    !($line=~/^. [A-Za-z\d_]+:/) and !($line=~/^.\s+default:/)) {
3915                         if (WARN("INDENTED_LABEL",
3916                                  "labels should not be indented\n" . $herecurr) &&
3917                             $fix) {
3918                                 $fixed[$fixlinenr] =~
3919                                     s/^(.)\s+/$1/;
3920                         }
3921                 }
3922
3923 # return is not a function
3924                 if (defined($stat) && $stat =~ /^.\s*return(\s*)\(/s) {
3925                         my $spacing = $1;
3926                         if ($^V && $^V ge 5.10.0 &&
3927                             $stat =~ /^.\s*return\s*($balanced_parens)\s*;\s*$/) {
3928                                 my $value = $1;
3929                                 $value = deparenthesize($value);
3930                                 if ($value =~ m/^\s*$FuncArg\s*(?:\?|$)/) {
3931                                         ERROR("RETURN_PARENTHESES",
3932                                               "return is not a function, parentheses are not required\n" . $herecurr);
3933                                 }
3934                         } elsif ($spacing !~ /\s+/) {
3935                                 ERROR("SPACING",
3936                                       "space required before the open parenthesis '('\n" . $herecurr);
3937                         }
3938                 }
3939
3940 # unnecessary return in a void function
3941 # at end-of-function, with the previous line a single leading tab, then return;
3942 # and the line before that not a goto label target like "out:"
3943                 if ($sline =~ /^[ \+]}\s*$/ &&
3944                     $prevline =~ /^\+\treturn\s*;\s*$/ &&
3945                     $linenr >= 3 &&
3946                     $lines[$linenr - 3] =~ /^[ +]/ &&
3947                     $lines[$linenr - 3] !~ /^[ +]\s*$Ident\s*:/) {
3948                         WARN("RETURN_VOID",
3949                              "void function return statements are not generally useful\n" . $hereprev);
3950                }
3951
3952 # if statements using unnecessary parentheses - ie: if ((foo == bar))
3953                 if ($^V && $^V ge 5.10.0 &&
3954                     $line =~ /\bif\s*((?:\(\s*){2,})/) {
3955                         my $openparens = $1;
3956                         my $count = $openparens =~ tr@\(@\(@;
3957                         my $msg = "";
3958                         if ($line =~ /\bif\s*(?:\(\s*){$count,$count}$LvalOrFunc\s*($Compare)\s*$LvalOrFunc(?:\s*\)){$count,$count}/) {
3959                                 my $comp = $4;  #Not $1 because of $LvalOrFunc
3960                                 $msg = " - maybe == should be = ?" if ($comp eq "==");
3961                                 WARN("UNNECESSARY_PARENTHESES",
3962                                      "Unnecessary parentheses$msg\n" . $herecurr);
3963                         }
3964                 }
3965
3966 # Return of what appears to be an errno should normally be -'ve
3967                 if ($line =~ /^.\s*return\s*(E[A-Z]*)\s*;/) {
3968                         my $name = $1;
3969                         if ($name ne 'EOF' && $name ne 'ERROR') {
3970                                 WARN("USE_NEGATIVE_ERRNO",
3971                                      "return of an errno should typically be -ve (return -$1)\n" . $herecurr);
3972                         }
3973                 }
3974
3975 # Need a space before open parenthesis after if, while etc
3976                 if ($line =~ /\b(if|while|for|switch)\(/) {
3977                         if (ERROR("SPACING",
3978                                   "space required before the open parenthesis '('\n" . $herecurr) &&
3979                             $fix) {
3980                                 $fixed[$fixlinenr] =~
3981                                     s/\b(if|while|for|switch)\(/$1 \(/;
3982                         }
3983                 }
3984
3985 # Check for illegal assignment in if conditional -- and check for trailing
3986 # statements after the conditional.
3987                 if ($line =~ /do\s*(?!{)/) {
3988                         ($stat, $cond, $line_nr_next, $remain_next, $off_next) =
3989                                 ctx_statement_block($linenr, $realcnt, 0)
3990                                         if (!defined $stat);
3991                         my ($stat_next) = ctx_statement_block($line_nr_next,
3992                                                 $remain_next, $off_next);
3993                         $stat_next =~ s/\n./\n /g;
3994                         ##print "stat<$stat> stat_next<$stat_next>\n";
3995
3996                         if ($stat_next =~ /^\s*while\b/) {
3997                                 # If the statement carries leading newlines,
3998                                 # then count those as offsets.
3999                                 my ($whitespace) =
4000                                         ($stat_next =~ /^((?:\s*\n[+-])*\s*)/s);
4001                                 my $offset =
4002                                         statement_rawlines($whitespace) - 1;
4003
4004                                 $suppress_whiletrailers{$line_nr_next +
4005                                                                 $offset} = 1;
4006                         }
4007                 }
4008                 if (!defined $suppress_whiletrailers{$linenr} &&
4009                     defined($stat) && defined($cond) &&
4010                     $line =~ /\b(?:if|while|for)\s*\(/ && $line !~ /^.\s*#/) {
4011                         my ($s, $c) = ($stat, $cond);
4012
4013                         if ($c =~ /\bif\s*\(.*[^<>!=]=[^=].*/s) {
4014                                 ERROR("ASSIGN_IN_IF",
4015                                       "do not use assignment in if condition\n" . $herecurr);
4016                         }
4017
4018                         # Find out what is on the end of the line after the
4019                         # conditional.
4020                         substr($s, 0, length($c), '');
4021                         $s =~ s/\n.*//g;
4022                         $s =~ s/$;//g;  # Remove any comments
4023                         if (length($c) && $s !~ /^\s*{?\s*\\*\s*$/ &&
4024                             $c !~ /}\s*while\s*/)
4025                         {
4026                                 # Find out how long the conditional actually is.
4027                                 my @newlines = ($c =~ /\n/gs);
4028                                 my $cond_lines = 1 + $#newlines;
4029                                 my $stat_real = '';
4030
4031                                 $stat_real = raw_line($linenr, $cond_lines)
4032                                                         . "\n" if ($cond_lines);
4033                                 if (defined($stat_real) && $cond_lines > 1) {
4034                                         $stat_real = "[...]\n$stat_real";
4035                                 }
4036
4037                                 ERROR("TRAILING_STATEMENTS",
4038                                       "trailing statements should be on next line\n" . $herecurr . $stat_real);
4039                         }
4040                 }
4041
4042 # Check for bitwise tests written as boolean
4043                 if ($line =~ /
4044                         (?:
4045                                 (?:\[|\(|\&\&|\|\|)
4046                                 \s*0[xX][0-9]+\s*
4047                                 (?:\&\&|\|\|)
4048                         |
4049                                 (?:\&\&|\|\|)
4050                                 \s*0[xX][0-9]+\s*
4051                                 (?:\&\&|\|\||\)|\])
4052                         )/x)
4053                 {
4054                         WARN("HEXADECIMAL_BOOLEAN_TEST",
4055                              "boolean test with hexadecimal, perhaps just 1 \& or \|?\n" . $herecurr);
4056                 }
4057
4058 # if and else should not have general statements after it
4059                 if ($line =~ /^.\s*(?:}\s*)?else\b(.*)/) {
4060                         my $s = $1;
4061                         $s =~ s/$;//g;  # Remove any comments
4062                         if ($s !~ /^\s*(?:\sif|(?:{|)\s*\\?\s*$)/) {
4063                                 ERROR("TRAILING_STATEMENTS",
4064                                       "trailing statements should be on next line\n" . $herecurr);
4065                         }
4066                 }
4067 # if should not continue a brace
4068                 if ($line =~ /}\s*if\b/) {
4069                         ERROR("TRAILING_STATEMENTS",
4070                               "trailing statements should be on next line (or did you mean 'else if'?)\n" .
4071                                 $herecurr);
4072                 }
4073 # case and default should not have general statements after them
4074                 if ($line =~ /^.\s*(?:case\s*.*|default\s*):/g &&
4075                     $line !~ /\G(?:
4076                         (?:\s*$;*)(?:\s*{)?(?:\s*$;*)(?:\s*\\)?\s*$|
4077                         \s*return\s+
4078                     )/xg)
4079                 {
4080                         ERROR("TRAILING_STATEMENTS",
4081                               "trailing statements should be on next line\n" . $herecurr);
4082                 }
4083
4084                 # Check for }<nl>else {, these must be at the same
4085                 # indent level to be relevant to each other.
4086                 if ($prevline=~/}\s*$/ and $line=~/^.\s*else\s*/ &&
4087                     $previndent == $indent) {
4088                         if (ERROR("ELSE_AFTER_BRACE",
4089                                   "else should follow close brace '}'\n" . $hereprev) &&
4090                             $fix && $prevline =~ /^\+/ && $line =~ /^\+/) {
4091                                 fix_delete_line($fixlinenr - 1, $prevrawline);
4092                                 fix_delete_line($fixlinenr, $rawline);
4093                                 my $fixedline = $prevrawline;
4094                                 $fixedline =~ s/}\s*$//;
4095                                 if ($fixedline !~ /^\+\s*$/) {
4096                                         fix_insert_line($fixlinenr, $fixedline);
4097                                 }
4098                                 $fixedline = $rawline;
4099                                 $fixedline =~ s/^(.\s*)else/$1} else/;
4100                                 fix_insert_line($fixlinenr, $fixedline);
4101                         }
4102                 }
4103
4104                 if ($prevline=~/}\s*$/ and $line=~/^.\s*while\s*/ &&
4105                     $previndent == $indent) {
4106                         my ($s, $c) = ctx_statement_block($linenr, $realcnt, 0);
4107
4108                         # Find out what is on the end of the line after the
4109                         # conditional.
4110                         substr($s, 0, length($c), '');
4111                         $s =~ s/\n.*//g;
4112
4113                         if ($s =~ /^\s*;/) {
4114                                 if (ERROR("WHILE_AFTER_BRACE",
4115                                           "while should follow close brace '}'\n" . $hereprev) &&
4116                                     $fix && $prevline =~ /^\+/ && $line =~ /^\+/) {
4117                                         fix_delete_line($fixlinenr - 1, $prevrawline);
4118                                         fix_delete_line($fixlinenr, $rawline);
4119                                         my $fixedline = $prevrawline;
4120                                         my $trailing = $rawline;
4121                                         $trailing =~ s/^\+//;
4122                                         $trailing = trim($trailing);
4123                                         $fixedline =~ s/}\s*$/} $trailing/;
4124                                         fix_insert_line($fixlinenr, $fixedline);
4125                                 }
4126                         }
4127                 }
4128
4129 #Specific variable tests
4130                 while ($line =~ m{($Constant|$Lval)}g) {
4131                         my $var = $1;
4132
4133 #gcc binary extension
4134                         if ($var =~ /^$Binary$/) {
4135                                 if (WARN("GCC_BINARY_CONSTANT",
4136                                          "Avoid gcc v4.3+ binary constant extension: <$var>\n" . $herecurr) &&
4137                                     $fix) {
4138                                         my $hexval = sprintf("0x%x", oct($var));
4139                                         $fixed[$fixlinenr] =~
4140                                             s/\b$var\b/$hexval/;
4141                                 }
4142                         }
4143
4144 #CamelCase
4145                         if ($var !~ /^$Constant$/ &&
4146                             $var =~ /[A-Z][a-z]|[a-z][A-Z]/ &&
4147 #Ignore Page<foo> variants
4148                             $var !~ /^(?:Clear|Set|TestClear|TestSet|)Page[A-Z]/ &&
4149 #Ignore SI style variants like nS, mV and dB (ie: max_uV, regulator_min_uA_show)
4150                             $var !~ /^(?:[a-z_]*?)_?[a-z][A-Z](?:_[a-z_]+)?$/ &&
4151 #Ignore some three character SI units explicitly, like MiB and KHz
4152                             $var !~ /^(?:[a-z_]*?)_?(?:[KMGT]iB|[KMGT]?Hz)(?:_[a-z_]+)?$/) {
4153                                 while ($var =~ m{($Ident)}g) {
4154                                         my $word = $1;
4155                                         next if ($word !~ /[A-Z][a-z]|[a-z][A-Z]/);
4156                                         if ($check) {
4157                                                 seed_camelcase_includes();
4158                                                 if (!$file && !$camelcase_file_seeded) {
4159                                                         seed_camelcase_file($realfile);
4160                                                         $camelcase_file_seeded = 1;
4161                                                 }
4162                                         }
4163                                         if (!defined $camelcase{$word}) {
4164                                                 $camelcase{$word} = 1;
4165                                                 CHK("CAMELCASE",
4166                                                     "Avoid CamelCase: <$word>\n" . $herecurr);
4167                                         }
4168                                 }
4169                         }
4170                 }
4171
4172 #no spaces allowed after \ in define
4173                 if ($line =~ /\#\s*define.*\\\s+$/) {
4174                         if (WARN("WHITESPACE_AFTER_LINE_CONTINUATION",
4175                                  "Whitespace after \\ makes next lines useless\n" . $herecurr) &&
4176                             $fix) {
4177                                 $fixed[$fixlinenr] =~ s/\s+$//;
4178                         }
4179                 }
4180
4181 #warn if <asm/foo.h> is #included and <linux/foo.h> is available (uses RAW line)
4182                 if ($tree && $rawline =~ m{^.\s*\#\s*include\s*\<asm\/(.*)\.h\>}) {
4183                         my $file = "$1.h";
4184                         my $checkfile = "include/linux/$file";
4185                         if (-f "$root/$checkfile" &&
4186                             $realfile ne $checkfile &&
4187                             $1 !~ /$allowed_asm_includes/)
4188                         {
4189                                 if ($realfile =~ m{^arch/}) {
4190                                         CHK("ARCH_INCLUDE_LINUX",
4191                                             "Consider using #include <linux/$file> instead of <asm/$file>\n" . $herecurr);
4192                                 } else {
4193                                         WARN("INCLUDE_LINUX",
4194                                              "Use #include <linux/$file> instead of <asm/$file>\n" . $herecurr);
4195                                 }
4196                         }
4197                 }
4198
4199 # multi-statement macros should be enclosed in a do while loop, grab the
4200 # first statement and ensure its the whole macro if its not enclosed
4201 # in a known good container
4202                 if ($realfile !~ m@/vmlinux.lds.h$@ &&
4203                     $line =~ /^.\s*\#\s*define\s*$Ident(\()?/) {
4204                         my $ln = $linenr;
4205                         my $cnt = $realcnt;
4206                         my ($off, $dstat, $dcond, $rest);
4207                         my $ctx = '';
4208                         my $has_flow_statement = 0;
4209                         my $has_arg_concat = 0;
4210                         ($dstat, $dcond, $ln, $cnt, $off) =
4211                                 ctx_statement_block($linenr, $realcnt, 0);
4212                         $ctx = $dstat;
4213                         #print "dstat<$dstat> dcond<$dcond> cnt<$cnt> off<$off>\n";
4214                         #print "LINE<$lines[$ln-1]> len<" . length($lines[$ln-1]) . "\n";
4215
4216                         $has_flow_statement = 1 if ($ctx =~ /\b(goto|return)\b/);
4217                         $has_arg_concat = 1 if ($ctx =~ /\#\#/);
4218
4219                         $dstat =~ s/^.\s*\#\s*define\s+$Ident(?:\([^\)]*\))?\s*//;
4220                         $dstat =~ s/$;//g;
4221                         $dstat =~ s/\\\n.//g;
4222                         $dstat =~ s/^\s*//s;
4223                         $dstat =~ s/\s*$//s;
4224
4225                         # Flatten any parentheses and braces
4226                         while ($dstat =~ s/\([^\(\)]*\)/1/ ||
4227                                $dstat =~ s/\{[^\{\}]*\}/1/ ||
4228                                $dstat =~ s/\[[^\[\]]*\]/1/)
4229                         {
4230                         }
4231
4232                         # Flatten any obvious string concatentation.
4233                         while ($dstat =~ s/("X*")\s*$Ident/$1/ ||
4234                                $dstat =~ s/$Ident\s*("X*")/$1/)
4235                         {
4236                         }
4237
4238                         my $exceptions = qr{
4239                                 $Declare|
4240                                 module_param_named|
4241                                 MODULE_PARM_DESC|
4242                                 DECLARE_PER_CPU|
4243                                 DEFINE_PER_CPU|
4244                                 __typeof__\(|
4245                                 union|
4246                                 struct|
4247                                 \.$Ident\s*=\s*|
4248                                 ^\"|\"$
4249                         }x;
4250                         #print "REST<$rest> dstat<$dstat> ctx<$ctx>\n";
4251                         if ($dstat ne '' &&
4252                             $dstat !~ /^(?:$Ident|-?$Constant),$/ &&                    # 10, // foo(),
4253                             $dstat !~ /^(?:$Ident|-?$Constant);$/ &&                    # foo();
4254                             $dstat !~ /^[!~-]?(?:$Lval|$Constant)$/ &&          # 10 // foo() // !foo // ~foo // -foo // foo->bar // foo.bar->baz
4255                             $dstat !~ /^'X'$/ && $dstat !~ /^'XX'$/ &&                  # character constants
4256                             $dstat !~ /$exceptions/ &&
4257                             $dstat !~ /^\.$Ident\s*=/ &&                                # .foo =
4258                             $dstat !~ /^(?:\#\s*$Ident|\#\s*$Constant)\s*$/ &&          # stringification #foo
4259                             $dstat !~ /^do\s*$Constant\s*while\s*$Constant;?$/ &&       # do {...} while (...); // do {...} while (...)
4260                             $dstat !~ /^for\s*$Constant$/ &&                            # for (...)
4261                             $dstat !~ /^for\s*$Constant\s+(?:$Ident|-?$Constant)$/ &&   # for (...) bar()
4262                             $dstat !~ /^do\s*{/ &&                                      # do {...
4263                             $dstat !~ /^\({/ &&                                         # ({...
4264                             $ctx !~ /^.\s*#\s*define\s+TRACE_(?:SYSTEM|INCLUDE_FILE|INCLUDE_PATH)\b/)
4265                         {
4266                                 $ctx =~ s/\n*$//;
4267                                 my $herectx = $here . "\n";
4268                                 my $cnt = statement_rawlines($ctx);
4269
4270                                 for (my $n = 0; $n < $cnt; $n++) {
4271                                         $herectx .= raw_line($linenr, $n) . "\n";
4272                                 }
4273
4274                                 if ($dstat =~ /;/) {
4275                                         ERROR("MULTISTATEMENT_MACRO_USE_DO_WHILE",
4276                                               "Macros with multiple statements should be enclosed in a do - while loop\n" . "$herectx");
4277                                 } else {
4278                                         ERROR("COMPLEX_MACRO",
4279                                               "Macros with complex values should be enclosed in parentheses\n" . "$herectx");
4280                                 }
4281                         }
4282
4283 # check for macros with flow control, but without ## concatenation
4284 # ## concatenation is commonly a macro that defines a function so ignore those
4285                         if ($has_flow_statement && !$has_arg_concat) {
4286                                 my $herectx = $here . "\n";
4287                                 my $cnt = statement_rawlines($ctx);
4288
4289                                 for (my $n = 0; $n < $cnt; $n++) {
4290                                         $herectx .= raw_line($linenr, $n) . "\n";
4291                                 }
4292                                 WARN("MACRO_WITH_FLOW_CONTROL",
4293                                      "Macros with flow control statements should be avoided\n" . "$herectx");
4294                         }
4295
4296 # check for line continuations outside of #defines, preprocessor #, and asm
4297
4298                 } else {
4299                         if ($prevline !~ /^..*\\$/ &&
4300                             $line !~ /^\+\s*\#.*\\$/ &&         # preprocessor
4301                             $line !~ /^\+.*\b(__asm__|asm)\b.*\\$/ &&   # asm
4302                             $line =~ /^\+.*\\$/) {
4303                                 WARN("LINE_CONTINUATIONS",
4304                                      "Avoid unnecessary line continuations\n" . $herecurr);
4305                         }
4306                 }
4307
4308 # do {} while (0) macro tests:
4309 # single-statement macros do not need to be enclosed in do while (0) loop,
4310 # macro should not end with a semicolon
4311                 if ($^V && $^V ge 5.10.0 &&
4312                     $realfile !~ m@/vmlinux.lds.h$@ &&
4313                     $line =~ /^.\s*\#\s*define\s+$Ident(\()?/) {
4314                         my $ln = $linenr;
4315                         my $cnt = $realcnt;
4316                         my ($off, $dstat, $dcond, $rest);
4317                         my $ctx = '';
4318                         ($dstat, $dcond, $ln, $cnt, $off) =
4319                                 ctx_statement_block($linenr, $realcnt, 0);
4320                         $ctx = $dstat;
4321
4322                         $dstat =~ s/\\\n.//g;
4323                         $dstat =~ s/$;/ /g;
4324
4325                         if ($dstat =~ /^\+\s*#\s*define\s+$Ident\s*${balanced_parens}\s*do\s*{(.*)\s*}\s*while\s*\(\s*0\s*\)\s*([;\s]*)\s*$/) {
4326                                 my $stmts = $2;
4327                                 my $semis = $3;
4328
4329                                 $ctx =~ s/\n*$//;
4330                                 my $cnt = statement_rawlines($ctx);
4331                                 my $herectx = $here . "\n";
4332
4333                                 for (my $n = 0; $n < $cnt; $n++) {
4334                                         $herectx .= raw_line($linenr, $n) . "\n";
4335                                 }
4336
4337                                 if (($stmts =~ tr/;/;/) == 1 &&
4338                                     $stmts !~ /^\s*(if|while|for|switch)\b/) {
4339                                         WARN("SINGLE_STATEMENT_DO_WHILE_MACRO",
4340                                              "Single statement macros should not use a do {} while (0) loop\n" . "$herectx");
4341                                 }
4342                                 if (defined $semis && $semis ne "") {
4343                                         WARN("DO_WHILE_MACRO_WITH_TRAILING_SEMICOLON",
4344                                              "do {} while (0) macros should not be semicolon terminated\n" . "$herectx");
4345                                 }
4346                         } elsif ($dstat =~ /^\+\s*#\s*define\s+$Ident.*;\s*$/) {
4347                                 $ctx =~ s/\n*$//;
4348                                 my $cnt = statement_rawlines($ctx);
4349                                 my $herectx = $here . "\n";
4350
4351                                 for (my $n = 0; $n < $cnt; $n++) {
4352                                         $herectx .= raw_line($linenr, $n) . "\n";
4353                                 }
4354
4355                                 WARN("TRAILING_SEMICOLON",
4356                                      "macros should not use a trailing semicolon\n" . "$herectx");
4357                         }
4358                 }
4359
4360 # make sure symbols are always wrapped with VMLINUX_SYMBOL() ...
4361 # all assignments may have only one of the following with an assignment:
4362 #       .
4363 #       ALIGN(...)
4364 #       VMLINUX_SYMBOL(...)
4365                 if ($realfile eq 'vmlinux.lds.h' && $line =~ /(?:(?:^|\s)$Ident\s*=|=\s*$Ident(?:\s|$))/) {
4366                         WARN("MISSING_VMLINUX_SYMBOL",
4367                              "vmlinux.lds.h needs VMLINUX_SYMBOL() around C-visible symbols\n" . $herecurr);
4368                 }
4369
4370 # check for redundant bracing round if etc
4371                 if ($line =~ /(^.*)\bif\b/ && $1 !~ /else\s*$/) {
4372                         my ($level, $endln, @chunks) =
4373                                 ctx_statement_full($linenr, $realcnt, 1);
4374                         #print "chunks<$#chunks> linenr<$linenr> endln<$endln> level<$level>\n";
4375                         #print "APW: <<$chunks[1][0]>><<$chunks[1][1]>>\n";
4376                         if ($#chunks > 0 && $level == 0) {
4377                                 my @allowed = ();
4378                                 my $allow = 0;
4379                                 my $seen = 0;
4380                                 my $herectx = $here . "\n";
4381                                 my $ln = $linenr - 1;
4382                                 for my $chunk (@chunks) {
4383                                         my ($cond, $block) = @{$chunk};
4384
4385                                         # If the condition carries leading newlines, then count those as offsets.
4386                                         my ($whitespace) = ($cond =~ /^((?:\s*\n[+-])*\s*)/s);
4387                                         my $offset = statement_rawlines($whitespace) - 1;
4388
4389                                         $allowed[$allow] = 0;
4390                                         #print "COND<$cond> whitespace<$whitespace> offset<$offset>\n";
4391
4392                                         # We have looked at and allowed this specific line.
4393                                         $suppress_ifbraces{$ln + $offset} = 1;
4394
4395                                         $herectx .= "$rawlines[$ln + $offset]\n[...]\n";
4396                                         $ln += statement_rawlines($block) - 1;
4397
4398                                         substr($block, 0, length($cond), '');
4399
4400                                         $seen++ if ($block =~ /^\s*{/);
4401
4402                                         #print "cond<$cond> block<$block> allowed<$allowed[$allow]>\n";
4403                                         if (statement_lines($cond) > 1) {
4404                                                 #print "APW: ALLOWED: cond<$cond>\n";
4405                                                 $allowed[$allow] = 1;
4406                                         }
4407                                         if ($block =~/\b(?:if|for|while)\b/) {
4408                                                 #print "APW: ALLOWED: block<$block>\n";
4409                                                 $allowed[$allow] = 1;
4410                                         }
4411                                         if (statement_block_size($block) > 1) {
4412                                                 #print "APW: ALLOWED: lines block<$block>\n";
4413                                                 $allowed[$allow] = 1;
4414                                         }
4415                                         $allow++;
4416                                 }
4417                                 if ($seen) {
4418                                         my $sum_allowed = 0;
4419                                         foreach (@allowed) {
4420                                                 $sum_allowed += $_;
4421                                         }
4422                                         if ($sum_allowed == 0) {
4423                                                 WARN("BRACES",
4424                                                      "braces {} are not necessary for any arm of this statement\n" . $herectx);
4425                                         } elsif ($sum_allowed != $allow &&
4426                                                  $seen != $allow) {
4427                                                 CHK("BRACES",
4428                                                     "braces {} should be used on all arms of this statement\n" . $herectx);
4429                                         }
4430                                 }
4431                         }
4432                 }
4433                 if (!defined $suppress_ifbraces{$linenr - 1} &&
4434                                         $line =~ /\b(if|while|for|else)\b/) {
4435                         my $allowed = 0;
4436
4437                         # Check the pre-context.
4438                         if (substr($line, 0, $-[0]) =~ /(\}\s*)$/) {
4439                                 #print "APW: ALLOWED: pre<$1>\n";
4440                                 $allowed = 1;
4441                         }
4442
4443                         my ($level, $endln, @chunks) =
4444                                 ctx_statement_full($linenr, $realcnt, $-[0]);
4445
4446                         # Check the condition.
4447                         my ($cond, $block) = @{$chunks[0]};
4448                         #print "CHECKING<$linenr> cond<$cond> block<$block>\n";
4449                         if (defined $cond) {
4450                                 substr($block, 0, length($cond), '');
4451                         }
4452                         if (statement_lines($cond) > 1) {
4453                                 #print "APW: ALLOWED: cond<$cond>\n";
4454                                 $allowed = 1;
4455                         }
4456                         if ($block =~/\b(?:if|for|while)\b/) {
4457                                 #print "APW: ALLOWED: block<$block>\n";
4458                                 $allowed = 1;
4459                         }
4460                         if (statement_block_size($block) > 1) {
4461                                 #print "APW: ALLOWED: lines block<$block>\n";
4462                                 $allowed = 1;
4463                         }
4464                         # Check the post-context.
4465                         if (defined $chunks[1]) {
4466                                 my ($cond, $block) = @{$chunks[1]};
4467                                 if (defined $cond) {
4468                                         substr($block, 0, length($cond), '');
4469                                 }
4470                                 if ($block =~ /^\s*\{/) {
4471                                         #print "APW: ALLOWED: chunk-1 block<$block>\n";
4472                                         $allowed = 1;
4473                                 }
4474                         }
4475                         if ($level == 0 && $block =~ /^\s*\{/ && !$allowed) {
4476                                 my $herectx = $here . "\n";
4477                                 my $cnt = statement_rawlines($block);
4478
4479                                 for (my $n = 0; $n < $cnt; $n++) {
4480                                         $herectx .= raw_line($linenr, $n) . "\n";
4481                                 }
4482
4483                                 WARN("BRACES",
4484                                      "braces {} are not necessary for single statement blocks\n" . $herectx);
4485                         }
4486                 }
4487
4488 # check for unnecessary blank lines around braces
4489                 if (($line =~ /^.\s*}\s*$/ && $prevrawline =~ /^.\s*$/)) {
4490                         if (CHK("BRACES",
4491                                 "Blank lines aren't necessary before a close brace '}'\n" . $hereprev) &&
4492                             $fix && $prevrawline =~ /^\+/) {
4493                                 fix_delete_line($fixlinenr - 1, $prevrawline);
4494                         }
4495                 }
4496                 if (($rawline =~ /^.\s*$/ && $prevline =~ /^..*{\s*$/)) {
4497                         if (CHK("BRACES",
4498                                 "Blank lines aren't necessary after an open brace '{'\n" . $hereprev) &&
4499                             $fix) {
4500                                 fix_delete_line($fixlinenr, $rawline);
4501                         }
4502                 }
4503
4504 # no volatiles please
4505                 my $asm_volatile = qr{\b(__asm__|asm)\s+(__volatile__|volatile)\b};
4506                 if ($line =~ /\bvolatile\b/ && $line !~ /$asm_volatile/) {
4507                         WARN("VOLATILE",
4508                              "Use of volatile is usually wrong: see Documentation/volatile-considered-harmful.txt\n" . $herecurr);
4509                 }
4510
4511 # Check for user-visible strings broken across lines, which breaks the ability
4512 # to grep for the string.  Make exceptions when the previous string ends in a
4513 # newline (multiple lines in one string constant) or '\t', '\r', ';', or '{'
4514 # (common in inline assembly) or is a octal \123 or hexadecimal \xaf value
4515                 if ($line =~ /^\+\s*"[X\t]*"/ &&
4516                     $prevline =~ /"\s*$/ &&
4517                     $prevrawline !~ /(?:\\(?:[ntr]|[0-7]{1,3}|x[0-9a-fA-F]{1,2})|;\s*|\{\s*)"\s*$/) {
4518                         if (WARN("SPLIT_STRING",
4519                                  "quoted string split across lines\n" . $hereprev) &&
4520                                      $fix &&
4521                                      $prevrawline =~ /^\+.*"\s*$/ &&
4522                                      $last_coalesced_string_linenr != $linenr - 1) {
4523                                 my $extracted_string = get_quoted_string($line, $rawline);
4524                                 my $comma_close = "";
4525                                 if ($rawline =~ /\Q$extracted_string\E(\s*\)\s*;\s*$|\s*,\s*)/) {
4526                                         $comma_close = $1;
4527                                 }
4528
4529                                 fix_delete_line($fixlinenr - 1, $prevrawline);
4530                                 fix_delete_line($fixlinenr, $rawline);
4531                                 my $fixedline = $prevrawline;
4532                                 $fixedline =~ s/"\s*$//;
4533                                 $fixedline .= substr($extracted_string, 1) . trim($comma_close);
4534                                 fix_insert_line($fixlinenr - 1, $fixedline);
4535                                 $fixedline = $rawline;
4536                                 $fixedline =~ s/\Q$extracted_string\E\Q$comma_close\E//;
4537                                 if ($fixedline !~ /\+\s*$/) {
4538                                         fix_insert_line($fixlinenr, $fixedline);
4539                                 }
4540                                 $last_coalesced_string_linenr = $linenr;
4541                         }
4542                 }
4543
4544 # check for missing a space in a string concatenation
4545                 if ($prevrawline =~ /[^\\]\w"$/ && $rawline =~ /^\+[\t ]+"\w/) {
4546                         WARN('MISSING_SPACE',
4547                              "break quoted strings at a space character\n" . $hereprev);
4548                 }
4549
4550 # check for spaces before a quoted newline
4551                 if ($rawline =~ /^.*\".*\s\\n/) {
4552                         if (WARN("QUOTED_WHITESPACE_BEFORE_NEWLINE",
4553                                  "unnecessary whitespace before a quoted newline\n" . $herecurr) &&
4554                             $fix) {
4555                                 $fixed[$fixlinenr] =~ s/^(\+.*\".*)\s+\\n/$1\\n/;
4556                         }
4557
4558                 }
4559
4560 # concatenated string without spaces between elements
4561                 if ($line =~ /"X+"[A-Z_]+/ || $line =~ /[A-Z_]+"X+"/) {
4562                         CHK("CONCATENATED_STRING",
4563                             "Concatenated strings should use spaces between elements\n" . $herecurr);
4564                 }
4565
4566 # uncoalesced string fragments
4567                 if ($line =~ /"X*"\s*"/) {
4568                         WARN("STRING_FRAGMENTS",
4569                              "Consecutive strings are generally better as a single string\n" . $herecurr);
4570                 }
4571
4572 # check for %L{u,d,i} in strings
4573                 my $string;
4574                 while ($line =~ /(?:^|")([X\t]*)(?:"|$)/g) {
4575                         $string = substr($rawline, $-[1], $+[1] - $-[1]);
4576                         $string =~ s/%%/__/g;
4577                         if ($string =~ /(?<!%)%L[udi]/) {
4578                                 WARN("PRINTF_L",
4579                                      "\%Ld/%Lu are not-standard C, use %lld/%llu\n" . $herecurr);
4580                                 last;
4581                         }
4582                 }
4583
4584 # check for line continuations in quoted strings with odd counts of "
4585                 if ($rawline =~ /\\$/ && $rawline =~ tr/"/"/ % 2) {
4586                         WARN("LINE_CONTINUATIONS",
4587                              "Avoid line continuations in quoted strings\n" . $herecurr);
4588                 }
4589
4590 # warn about #if 0
4591                 if ($line =~ /^.\s*\#\s*if\s+0\b/) {
4592                         CHK("REDUNDANT_CODE",
4593                             "if this code is redundant consider removing it\n" .
4594                                 $herecurr);
4595                 }
4596
4597 # check for needless "if (<foo>) fn(<foo>)" uses
4598                 if ($prevline =~ /\bif\s*\(\s*($Lval)\s*\)/) {
4599                         my $expr = '\s*\(\s*' . quotemeta($1) . '\s*\)\s*;';
4600                         if ($line =~ /\b(kfree|usb_free_urb|debugfs_remove(?:_recursive)?)$expr/) {
4601                                 WARN('NEEDLESS_IF',
4602                                      "$1(NULL) is safe and this check is probably not required\n" . $hereprev);
4603                         }
4604                 }
4605
4606 # check for unnecessary "Out of Memory" messages
4607                 if ($line =~ /^\+.*\b$logFunctions\s*\(/ &&
4608                     $prevline =~ /^[ \+]\s*if\s*\(\s*(\!\s*|NULL\s*==\s*)?($Lval)(\s*==\s*NULL\s*)?\s*\)/ &&
4609                     (defined $1 || defined $3) &&
4610                     $linenr > 3) {
4611                         my $testval = $2;
4612                         my $testline = $lines[$linenr - 3];
4613
4614                         my ($s, $c) = ctx_statement_block($linenr - 3, $realcnt, 0);
4615 #                       print("line: <$line>\nprevline: <$prevline>\ns: <$s>\nc: <$c>\n\n\n");
4616
4617                         if ($c =~ /(?:^|\n)[ \+]\s*(?:$Type\s*)?\Q$testval\E\s*=\s*(?:\([^\)]*\)\s*)?\s*(?:devm_)?(?:[kv][czm]alloc(?:_node|_array)?\b|kstrdup|(?:dev_)?alloc_skb)/) {
4618                                 WARN("OOM_MESSAGE",
4619                                      "Possible unnecessary 'out of memory' message\n" . $hereprev);
4620                         }
4621                 }
4622
4623 # check for logging functions with KERN_<LEVEL>
4624                 if ($line !~ /printk(?:_ratelimited|_once)?\s*\(/ &&
4625                     $line =~ /\b$logFunctions\s*\(.*\b(KERN_[A-Z]+)\b/) {
4626                         my $level = $1;
4627                         if (WARN("UNNECESSARY_KERN_LEVEL",
4628                                  "Possible unnecessary $level\n" . $herecurr) &&
4629                             $fix) {
4630                                 $fixed[$fixlinenr] =~ s/\s*$level\s*//;
4631                         }
4632                 }
4633
4634 # check for mask then right shift without a parentheses
4635                 if ($^V && $^V ge 5.10.0 &&
4636                     $line =~ /$LvalOrFunc\s*\&\s*($LvalOrFunc)\s*>>/ &&
4637                     $4 !~ /^\&/) { # $LvalOrFunc may be &foo, ignore if so
4638                         WARN("MASK_THEN_SHIFT",
4639                              "Possible precedence defect with mask then right shift - may need parentheses\n" . $herecurr);
4640                 }
4641
4642 # check for pointer comparisons to NULL
4643                 if ($^V && $^V ge 5.10.0) {
4644                         while ($line =~ /\b$LvalOrFunc\s*(==|\!=)\s*NULL\b/g) {
4645                                 my $val = $1;
4646                                 my $equal = "!";
4647                                 $equal = "" if ($4 eq "!=");
4648                                 if (CHK("COMPARISON_TO_NULL",
4649                                         "Comparison to NULL could be written \"${equal}${val}\"\n" . $herecurr) &&
4650                                             $fix) {
4651                                         $fixed[$fixlinenr] =~ s/\b\Q$val\E\s*(?:==|\!=)\s*NULL\b/$equal$val/;
4652                                 }
4653                         }
4654                 }
4655
4656 # check for bad placement of section $InitAttribute (e.g.: __initdata)
4657                 if ($line =~ /(\b$InitAttribute\b)/) {
4658                         my $attr = $1;
4659                         if ($line =~ /^\+\s*static\s+(?:const\s+)?(?:$attr\s+)?($NonptrTypeWithAttr)\s+(?:$attr\s+)?($Ident(?:\[[^]]*\])?)\s*[=;]/) {
4660                                 my $ptr = $1;
4661                                 my $var = $2;
4662                                 if ((($ptr =~ /\b(union|struct)\s+$attr\b/ &&
4663                                       ERROR("MISPLACED_INIT",
4664                                             "$attr should be placed after $var\n" . $herecurr)) ||
4665                                      ($ptr !~ /\b(union|struct)\s+$attr\b/ &&
4666                                       WARN("MISPLACED_INIT",
4667                                            "$attr should be placed after $var\n" . $herecurr))) &&
4668                                     $fix) {
4669                                         $fixed[$fixlinenr] =~ s/(\bstatic\s+(?:const\s+)?)(?:$attr\s+)?($NonptrTypeWithAttr)\s+(?:$attr\s+)?($Ident(?:\[[^]]*\])?)\s*([=;])\s*/"$1" . trim(string_find_replace($2, "\\s*$attr\\s*", " ")) . " " . trim(string_find_replace($3, "\\s*$attr\\s*", "")) . " $attr" . ("$4" eq ";" ? ";" : " = ")/e;
4670                                 }
4671                         }
4672                 }
4673
4674 # check for $InitAttributeData (ie: __initdata) with const
4675                 if ($line =~ /\bconst\b/ && $line =~ /($InitAttributeData)/) {
4676                         my $attr = $1;
4677                         $attr =~ /($InitAttributePrefix)(.*)/;
4678                         my $attr_prefix = $1;
4679                         my $attr_type = $2;
4680                         if (ERROR("INIT_ATTRIBUTE",
4681                                   "Use of const init definition must use ${attr_prefix}initconst\n" . $herecurr) &&
4682                             $fix) {
4683                                 $fixed[$fixlinenr] =~
4684                                     s/$InitAttributeData/${attr_prefix}initconst/;
4685                         }
4686                 }
4687
4688 # check for $InitAttributeConst (ie: __initconst) without const
4689                 if ($line !~ /\bconst\b/ && $line =~ /($InitAttributeConst)/) {
4690                         my $attr = $1;
4691                         if (ERROR("INIT_ATTRIBUTE",
4692                                   "Use of $attr requires a separate use of const\n" . $herecurr) &&
4693                             $fix) {
4694                                 my $lead = $fixed[$fixlinenr] =~
4695                                     /(^\+\s*(?:static\s+))/;
4696                                 $lead = rtrim($1);
4697                                 $lead = "$lead " if ($lead !~ /^\+$/);
4698                                 $lead = "${lead}const ";
4699                                 $fixed[$fixlinenr] =~ s/(^\+\s*(?:static\s+))/$lead/;
4700                         }
4701                 }
4702
4703 # don't use __constant_<foo> functions outside of include/uapi/
4704                 if ($realfile !~ m@^include/uapi/@ &&
4705                     $line =~ /(__constant_(?:htons|ntohs|[bl]e(?:16|32|64)_to_cpu|cpu_to_[bl]e(?:16|32|64)))\s*\(/) {
4706                         my $constant_func = $1;
4707                         my $func = $constant_func;
4708                         $func =~ s/^__constant_//;
4709                         if (WARN("CONSTANT_CONVERSION",
4710                                  "$constant_func should be $func\n" . $herecurr) &&
4711                             $fix) {
4712                                 $fixed[$fixlinenr] =~ s/\b$constant_func\b/$func/g;
4713                         }
4714                 }
4715
4716 # prefer usleep_range over udelay
4717                 if ($line =~ /\budelay\s*\(\s*(\d+)\s*\)/) {
4718                         my $delay = $1;
4719                         # ignore udelay's < 10, however
4720                         if (! ($delay < 10) ) {
4721                                 CHK("USLEEP_RANGE",
4722                                     "usleep_range is preferred over udelay; see Documentation/timers/timers-howto.txt\n" . $herecurr);
4723                         }
4724                         if ($delay > 2000) {
4725                                 WARN("LONG_UDELAY",
4726                                      "long udelay - prefer mdelay; see arch/arm/include/asm/delay.h\n" . $herecurr);
4727                         }
4728                 }
4729
4730 # warn about unexpectedly long msleep's
4731                 if ($line =~ /\bmsleep\s*\((\d+)\);/) {
4732                         if ($1 < 20) {
4733                                 WARN("MSLEEP",
4734                                      "msleep < 20ms can sleep for up to 20ms; see Documentation/timers/timers-howto.txt\n" . $herecurr);
4735                         }
4736                 }
4737
4738 # check for comparisons of jiffies
4739                 if ($line =~ /\bjiffies\s*$Compare|$Compare\s*jiffies\b/) {
4740                         WARN("JIFFIES_COMPARISON",
4741                              "Comparing jiffies is almost always wrong; prefer time_after, time_before and friends\n" . $herecurr);
4742                 }
4743
4744 # check for comparisons of get_jiffies_64()
4745                 if ($line =~ /\bget_jiffies_64\s*\(\s*\)\s*$Compare|$Compare\s*get_jiffies_64\s*\(\s*\)/) {
4746                         WARN("JIFFIES_COMPARISON",
4747                              "Comparing get_jiffies_64() is almost always wrong; prefer time_after64, time_before64 and friends\n" . $herecurr);
4748                 }
4749
4750 # warn about #ifdefs in C files
4751 #               if ($line =~ /^.\s*\#\s*if(|n)def/ && ($realfile =~ /\.c$/)) {
4752 #                       print "#ifdef in C files should be avoided\n";
4753 #                       print "$herecurr";
4754 #                       $clean = 0;
4755 #               }
4756
4757 # warn about spacing in #ifdefs
4758                 if ($line =~ /^.\s*\#\s*(ifdef|ifndef|elif)\s\s+/) {
4759                         if (ERROR("SPACING",
4760                                   "exactly one space required after that #$1\n" . $herecurr) &&
4761                             $fix) {
4762                                 $fixed[$fixlinenr] =~
4763                                     s/^(.\s*\#\s*(ifdef|ifndef|elif))\s{2,}/$1 /;
4764                         }
4765
4766                 }
4767
4768 # check for spinlock_t definitions without a comment.
4769                 if ($line =~ /^.\s*(struct\s+mutex|spinlock_t)\s+\S+;/ ||
4770                     $line =~ /^.\s*(DEFINE_MUTEX)\s*\(/) {
4771                         my $which = $1;
4772                         if (!ctx_has_comment($first_line, $linenr)) {
4773                                 CHK("UNCOMMENTED_DEFINITION",
4774                                     "$1 definition without comment\n" . $herecurr);
4775                         }
4776                 }
4777 # check for memory barriers without a comment.
4778                 if ($line =~ /\b(mb|rmb|wmb|read_barrier_depends|smp_mb|smp_rmb|smp_wmb|smp_read_barrier_depends)\(/) {
4779                         if (!ctx_has_comment($first_line, $linenr)) {
4780                                 WARN("MEMORY_BARRIER",
4781                                      "memory barrier without comment\n" . $herecurr);
4782                         }
4783                 }
4784 # check of hardware specific defines
4785                 if ($line =~ m@^.\s*\#\s*if.*\b(__i386__|__powerpc64__|__sun__|__s390x__)\b@ && $realfile !~ m@include/asm-@) {
4786                         CHK("ARCH_DEFINES",
4787                             "architecture specific defines should be avoided\n" .  $herecurr);
4788                 }
4789
4790 # Check that the storage class is at the beginning of a declaration
4791                 if ($line =~ /\b$Storage\b/ && $line !~ /^.\s*$Storage\b/) {
4792                         WARN("STORAGE_CLASS",
4793                              "storage class should be at the beginning of the declaration\n" . $herecurr)
4794                 }
4795
4796 # check the location of the inline attribute, that it is between
4797 # storage class and type.
4798                 if ($line =~ /\b$Type\s+$Inline\b/ ||
4799                     $line =~ /\b$Inline\s+$Storage\b/) {
4800                         ERROR("INLINE_LOCATION",
4801                               "inline keyword should sit between storage class and type\n" . $herecurr);
4802                 }
4803
4804 # Check for __inline__ and __inline, prefer inline
4805                 if ($realfile !~ m@\binclude/uapi/@ &&
4806                     $line =~ /\b(__inline__|__inline)\b/) {
4807                         if (WARN("INLINE",
4808                                  "plain inline is preferred over $1\n" . $herecurr) &&
4809                             $fix) {
4810                                 $fixed[$fixlinenr] =~ s/\b(__inline__|__inline)\b/inline/;
4811
4812                         }
4813                 }
4814
4815 # Check for __attribute__ packed, prefer __packed
4816                 if ($realfile !~ m@\binclude/uapi/@ &&
4817                     $line =~ /\b__attribute__\s*\(\s*\(.*\bpacked\b/) {
4818                         WARN("PREFER_PACKED",
4819                              "__packed is preferred over __attribute__((packed))\n" . $herecurr);
4820                 }
4821
4822 # Check for __attribute__ aligned, prefer __aligned
4823                 if ($realfile !~ m@\binclude/uapi/@ &&
4824                     $line =~ /\b__attribute__\s*\(\s*\(.*aligned/) {
4825                         WARN("PREFER_ALIGNED",
4826                              "__aligned(size) is preferred over __attribute__((aligned(size)))\n" . $herecurr);
4827                 }
4828
4829 # Check for __attribute__ format(printf, prefer __printf
4830                 if ($realfile !~ m@\binclude/uapi/@ &&
4831                     $line =~ /\b__attribute__\s*\(\s*\(\s*format\s*\(\s*printf/) {
4832                         if (WARN("PREFER_PRINTF",
4833                                  "__printf(string-index, first-to-check) is preferred over __attribute__((format(printf, string-index, first-to-check)))\n" . $herecurr) &&
4834                             $fix) {
4835                                 $fixed[$fixlinenr] =~ s/\b__attribute__\s*\(\s*\(\s*format\s*\(\s*printf\s*,\s*(.*)\)\s*\)\s*\)/"__printf(" . trim($1) . ")"/ex;
4836
4837                         }
4838                 }
4839
4840 # Check for __attribute__ format(scanf, prefer __scanf
4841                 if ($realfile !~ m@\binclude/uapi/@ &&
4842                     $line =~ /\b__attribute__\s*\(\s*\(\s*format\s*\(\s*scanf\b/) {
4843                         if (WARN("PREFER_SCANF",
4844                                  "__scanf(string-index, first-to-check) is preferred over __attribute__((format(scanf, string-index, first-to-check)))\n" . $herecurr) &&
4845                             $fix) {
4846                                 $fixed[$fixlinenr] =~ s/\b__attribute__\s*\(\s*\(\s*format\s*\(\s*scanf\s*,\s*(.*)\)\s*\)\s*\)/"__scanf(" . trim($1) . ")"/ex;
4847                         }
4848                 }
4849
4850 # Check for __attribute__ weak, or __weak declarations (may have link issues)
4851                 if ($^V && $^V ge 5.10.0 &&
4852                     $line =~ /(?:$Declare|$DeclareMisordered)\s*$Ident\s*$balanced_parens\s*(?:$Attribute)?\s*;/ &&
4853                     ($line =~ /\b__attribute__\s*\(\s*\(.*\bweak\b/ ||
4854                      $line =~ /\b__weak\b/)) {
4855                         ERROR("WEAK_DECLARATION",
4856                               "Using weak declarations can have unintended link defects\n" . $herecurr);
4857                 }
4858
4859 # check for sizeof(&)
4860                 if ($line =~ /\bsizeof\s*\(\s*\&/) {
4861                         WARN("SIZEOF_ADDRESS",
4862                              "sizeof(& should be avoided\n" . $herecurr);
4863                 }
4864
4865 # check for sizeof without parenthesis
4866                 if ($line =~ /\bsizeof\s+((?:\*\s*|)$Lval|$Type(?:\s+$Lval|))/) {
4867                         if (WARN("SIZEOF_PARENTHESIS",
4868                                  "sizeof $1 should be sizeof($1)\n" . $herecurr) &&
4869                             $fix) {
4870                                 $fixed[$fixlinenr] =~ s/\bsizeof\s+((?:\*\s*|)$Lval|$Type(?:\s+$Lval|))/"sizeof(" . trim($1) . ")"/ex;
4871                         }
4872                 }
4873
4874 # check for struct spinlock declarations
4875                 if ($line =~ /^.\s*\bstruct\s+spinlock\s+\w+\s*;/) {
4876                         WARN("USE_SPINLOCK_T",
4877                              "struct spinlock should be spinlock_t\n" . $herecurr);
4878                 }
4879
4880 # check for seq_printf uses that could be seq_puts
4881                 if ($sline =~ /\bseq_printf\s*\(.*"\s*\)\s*;\s*$/) {
4882                         my $fmt = get_quoted_string($line, $rawline);
4883                         $fmt =~ s/%%//g;
4884                         if ($fmt !~ /%/) {
4885                                 if (WARN("PREFER_SEQ_PUTS",
4886                                          "Prefer seq_puts to seq_printf\n" . $herecurr) &&
4887                                     $fix) {
4888                                         $fixed[$fixlinenr] =~ s/\bseq_printf\b/seq_puts/;
4889                                 }
4890                         }
4891                 }
4892
4893 # Check for misused memsets
4894                 if ($^V && $^V ge 5.10.0 &&
4895                     defined $stat &&
4896                     $stat =~ /^\+(?:.*?)\bmemset\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\,\s*$FuncArg\s*\)/s) {
4897
4898                         my $ms_addr = $2;
4899                         my $ms_val = $7;
4900                         my $ms_size = $12;
4901
4902                         if ($ms_size =~ /^(0x|)0$/i) {
4903                                 ERROR("MEMSET",
4904                                       "memset to 0's uses 0 as the 2nd argument, not the 3rd\n" . "$here\n$stat\n");
4905                         } elsif ($ms_size =~ /^(0x|)1$/i) {
4906                                 WARN("MEMSET",
4907                                      "single byte memset is suspicious. Swapped 2nd/3rd argument?\n" . "$here\n$stat\n");
4908                         }
4909                 }
4910
4911 # Check for memcpy(foo, bar, ETH_ALEN) that could be ether_addr_copy(foo, bar)
4912                 if ($^V && $^V ge 5.10.0 &&
4913                     $line =~ /^\+(?:.*?)\bmemcpy\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\,\s*ETH_ALEN\s*\)/s) {
4914                         if (WARN("PREFER_ETHER_ADDR_COPY",
4915                                  "Prefer ether_addr_copy() over memcpy() if the Ethernet addresses are __aligned(2)\n" . $herecurr) &&
4916                             $fix) {
4917                                 $fixed[$fixlinenr] =~ s/\bmemcpy\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\,\s*ETH_ALEN\s*\)/ether_addr_copy($2, $7)/;
4918                         }
4919                 }
4920
4921 # typecasts on min/max could be min_t/max_t
4922                 if ($^V && $^V ge 5.10.0 &&
4923                     defined $stat &&
4924                     $stat =~ /^\+(?:.*?)\b(min|max)\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\)/) {
4925                         if (defined $2 || defined $7) {
4926                                 my $call = $1;
4927                                 my $cast1 = deparenthesize($2);
4928                                 my $arg1 = $3;
4929                                 my $cast2 = deparenthesize($7);
4930                                 my $arg2 = $8;
4931                                 my $cast;
4932
4933                                 if ($cast1 ne "" && $cast2 ne "" && $cast1 ne $cast2) {
4934                                         $cast = "$cast1 or $cast2";
4935                                 } elsif ($cast1 ne "") {
4936                                         $cast = $cast1;
4937                                 } else {
4938                                         $cast = $cast2;
4939                                 }
4940                                 WARN("MINMAX",
4941                                      "$call() should probably be ${call}_t($cast, $arg1, $arg2)\n" . "$here\n$stat\n");
4942                         }
4943                 }
4944
4945 # check usleep_range arguments
4946                 if ($^V && $^V ge 5.10.0 &&
4947                     defined $stat &&
4948                     $stat =~ /^\+(?:.*?)\busleep_range\s*\(\s*($FuncArg)\s*,\s*($FuncArg)\s*\)/) {
4949                         my $min = $1;
4950                         my $max = $7;
4951                         if ($min eq $max) {
4952                                 WARN("USLEEP_RANGE",
4953                                      "usleep_range should not use min == max args; see Documentation/timers/timers-howto.txt\n" . "$here\n$stat\n");
4954                         } elsif ($min =~ /^\d+$/ && $max =~ /^\d+$/ &&
4955                                  $min > $max) {
4956                                 WARN("USLEEP_RANGE",
4957                                      "usleep_range args reversed, use min then max; see Documentation/timers/timers-howto.txt\n" . "$here\n$stat\n");
4958                         }
4959                 }
4960
4961 # check for naked sscanf
4962                 if ($^V && $^V ge 5.10.0 &&
4963                     defined $stat &&
4964                     $line =~ /\bsscanf\b/ &&
4965                     ($stat !~ /$Ident\s*=\s*sscanf\s*$balanced_parens/ &&
4966                      $stat !~ /\bsscanf\s*$balanced_parens\s*(?:$Compare)/ &&
4967                      $stat !~ /(?:$Compare)\s*\bsscanf\s*$balanced_parens/)) {
4968                         my $lc = $stat =~ tr@\n@@;
4969                         $lc = $lc + $linenr;
4970                         my $stat_real = raw_line($linenr, 0);
4971                         for (my $count = $linenr + 1; $count <= $lc; $count++) {
4972                                 $stat_real = $stat_real . "\n" . raw_line($count, 0);
4973                         }
4974                         WARN("NAKED_SSCANF",
4975                              "unchecked sscanf return value\n" . "$here\n$stat_real\n");
4976                 }
4977
4978 # check for simple sscanf that should be kstrto<foo>
4979                 if ($^V && $^V ge 5.10.0 &&
4980                     defined $stat &&
4981                     $line =~ /\bsscanf\b/) {
4982                         my $lc = $stat =~ tr@\n@@;
4983                         $lc = $lc + $linenr;
4984                         my $stat_real = raw_line($linenr, 0);
4985                         for (my $count = $linenr + 1; $count <= $lc; $count++) {
4986                                 $stat_real = $stat_real . "\n" . raw_line($count, 0);
4987                         }
4988                         if ($stat_real =~ /\bsscanf\b\s*\(\s*$FuncArg\s*,\s*("[^"]+")/) {
4989                                 my $format = $6;
4990                                 my $count = $format =~ tr@%@%@;
4991                                 if ($count == 1 &&
4992                                     $format =~ /^"\%(?i:ll[udxi]|[udxi]ll|ll|[hl]h?[udxi]|[udxi][hl]h?|[hl]h?|[udxi])"$/) {
4993                                         WARN("SSCANF_TO_KSTRTO",
4994                                              "Prefer kstrto<type> to single variable sscanf\n" . "$here\n$stat_real\n");
4995                                 }
4996                         }
4997                 }
4998
4999 # check for new externs in .h files.
5000                 if ($realfile =~ /\.h$/ &&
5001                     $line =~ /^\+\s*(extern\s+)$Type\s*$Ident\s*\(/s) {
5002                         if (CHK("AVOID_EXTERNS",
5003                                 "extern prototypes should be avoided in .h files\n" . $herecurr) &&
5004                             $fix) {
5005                                 $fixed[$fixlinenr] =~ s/(.*)\bextern\b\s*(.*)/$1$2/;
5006                         }
5007                 }
5008
5009 # check for new externs in .c files.
5010                 if ($realfile =~ /\.c$/ && defined $stat &&
5011                     $stat =~ /^.\s*(?:extern\s+)?$Type\s+($Ident)(\s*)\(/s)
5012                 {
5013                         my $function_name = $1;
5014                         my $paren_space = $2;
5015
5016                         my $s = $stat;
5017                         if (defined $cond) {
5018                                 substr($s, 0, length($cond), '');
5019                         }
5020                         if ($s =~ /^\s*;/ &&
5021                             $function_name ne 'uninitialized_var')
5022                         {
5023                                 WARN("AVOID_EXTERNS",
5024                                      "externs should be avoided in .c files\n" .  $herecurr);
5025                         }
5026
5027                         if ($paren_space =~ /\n/) {
5028                                 WARN("FUNCTION_ARGUMENTS",
5029                                      "arguments for function declarations should follow identifier\n" . $herecurr);
5030                         }
5031
5032                 } elsif ($realfile =~ /\.c$/ && defined $stat &&
5033                     $stat =~ /^.\s*extern\s+/)
5034                 {
5035                         WARN("AVOID_EXTERNS",
5036                              "externs should be avoided in .c files\n" .  $herecurr);
5037                 }
5038
5039 # checks for new __setup's
5040                 if ($rawline =~ /\b__setup\("([^"]*)"/) {
5041                         my $name = $1;
5042
5043                         if (!grep(/$name/, @setup_docs)) {
5044                                 CHK("UNDOCUMENTED_SETUP",
5045                                     "__setup appears un-documented -- check Documentation/kernel-parameters.txt\n" . $herecurr);
5046                         }
5047                 }
5048
5049 # check for pointless casting of kmalloc return
5050                 if ($line =~ /\*\s*\)\s*[kv][czm]alloc(_node){0,1}\b/) {
5051                         WARN("UNNECESSARY_CASTS",
5052                              "unnecessary cast may hide bugs, see http://c-faq.com/malloc/mallocnocast.html\n" . $herecurr);
5053                 }
5054
5055 # alloc style
5056 # p = alloc(sizeof(struct foo), ...) should be p = alloc(sizeof(*p), ...)
5057                 if ($^V && $^V ge 5.10.0 &&
5058                     $line =~ /\b($Lval)\s*\=\s*(?:$balanced_parens)?\s*([kv][mz]alloc(?:_node)?)\s*\(\s*(sizeof\s*\(\s*struct\s+$Lval\s*\))/) {
5059                         CHK("ALLOC_SIZEOF_STRUCT",
5060                             "Prefer $3(sizeof(*$1)...) over $3($4...)\n" . $herecurr);
5061                 }
5062
5063 # check for k[mz]alloc with multiplies that could be kmalloc_array/kcalloc
5064                 if ($^V && $^V ge 5.10.0 &&
5065                     $line =~ /\b($Lval)\s*\=\s*(?:$balanced_parens)?\s*(k[mz]alloc)\s*\(\s*($FuncArg)\s*\*\s*($FuncArg)\s*,/) {
5066                         my $oldfunc = $3;
5067                         my $a1 = $4;
5068                         my $a2 = $10;
5069                         my $newfunc = "kmalloc_array";
5070                         $newfunc = "kcalloc" if ($oldfunc eq "kzalloc");
5071                         my $r1 = $a1;
5072                         my $r2 = $a2;
5073                         if ($a1 =~ /^sizeof\s*\S/) {
5074                                 $r1 = $a2;
5075                                 $r2 = $a1;
5076                         }
5077                         if ($r1 !~ /^sizeof\b/ && $r2 =~ /^sizeof\s*\S/ &&
5078                             !($r1 =~ /^$Constant$/ || $r1 =~ /^[A-Z_][A-Z0-9_]*$/)) {
5079                                 if (WARN("ALLOC_WITH_MULTIPLY",
5080                                          "Prefer $newfunc over $oldfunc with multiply\n" . $herecurr) &&
5081                                     $fix) {
5082                                         $fixed[$fixlinenr] =~ s/\b($Lval)\s*\=\s*(?:$balanced_parens)?\s*(k[mz]alloc)\s*\(\s*($FuncArg)\s*\*\s*($FuncArg)/$1 . ' = ' . "$newfunc(" . trim($r1) . ', ' . trim($r2)/e;
5083
5084                                 }
5085                         }
5086                 }
5087
5088 # check for krealloc arg reuse
5089                 if ($^V && $^V ge 5.10.0 &&
5090                     $line =~ /\b($Lval)\s*\=\s*(?:$balanced_parens)?\s*krealloc\s*\(\s*\1\s*,/) {
5091                         WARN("KREALLOC_ARG_REUSE",
5092                              "Reusing the krealloc arg is almost always a bug\n" . $herecurr);
5093                 }
5094
5095 # check for alloc argument mismatch
5096                 if ($line =~ /\b(kcalloc|kmalloc_array)\s*\(\s*sizeof\b/) {
5097                         WARN("ALLOC_ARRAY_ARGS",
5098                              "$1 uses number as first arg, sizeof is generally wrong\n" . $herecurr);
5099                 }
5100
5101 # check for multiple semicolons
5102                 if ($line =~ /;\s*;\s*$/) {
5103                         if (WARN("ONE_SEMICOLON",
5104                                  "Statements terminations use 1 semicolon\n" . $herecurr) &&
5105                             $fix) {
5106                                 $fixed[$fixlinenr] =~ s/(\s*;\s*){2,}$/;/g;
5107                         }
5108                 }
5109
5110 # check for #defines like: 1 << <digit> that could be BIT(digit)
5111                 if ($line =~ /#\s*define\s+\w+\s+\(?\s*1\s*([ulUL]*)\s*\<\<\s*(?:\d+|$Ident)\s*\)?/) {
5112                         my $ull = "";
5113                         $ull = "_ULL" if (defined($1) && $1 =~ /ll/i);
5114                         if (CHK("BIT_MACRO",
5115                                 "Prefer using the BIT$ull macro\n" . $herecurr) &&
5116                             $fix) {
5117                                 $fixed[$fixlinenr] =~ s/\(?\s*1\s*[ulUL]*\s*<<\s*(\d+|$Ident)\s*\)?/BIT${ull}($1)/;
5118                         }
5119                 }
5120
5121 # check for case / default statements not preceded by break/fallthrough/switch
5122                 if ($line =~ /^.\s*(?:case\s+(?:$Ident|$Constant)\s*|default):/) {
5123                         my $has_break = 0;
5124                         my $has_statement = 0;
5125                         my $count = 0;
5126                         my $prevline = $linenr;
5127                         while ($prevline > 1 && ($file || $count < 3) && !$has_break) {
5128                                 $prevline--;
5129                                 my $rline = $rawlines[$prevline - 1];
5130                                 my $fline = $lines[$prevline - 1];
5131                                 last if ($fline =~ /^\@\@/);
5132                                 next if ($fline =~ /^\-/);
5133                                 next if ($fline =~ /^.(?:\s*(?:case\s+(?:$Ident|$Constant)[\s$;]*|default):[\s$;]*)*$/);
5134                                 $has_break = 1 if ($rline =~ /fall[\s_-]*(through|thru)/i);
5135                                 next if ($fline =~ /^.[\s$;]*$/);
5136                                 $has_statement = 1;
5137                                 $count++;
5138                                 $has_break = 1 if ($fline =~ /\bswitch\b|\b(?:break\s*;[\s$;]*$|return\b|goto\b|continue\b)/);
5139                         }
5140                         if (!$has_break && $has_statement) {
5141                                 WARN("MISSING_BREAK",
5142                                      "Possible switch case/default not preceeded by break or fallthrough comment\n" . $herecurr);
5143                         }
5144                 }
5145
5146 # check for switch/default statements without a break;
5147                 if ($^V && $^V ge 5.10.0 &&
5148                     defined $stat &&
5149                     $stat =~ /^\+[$;\s]*(?:case[$;\s]+\w+[$;\s]*:[$;\s]*|)*[$;\s]*\bdefault[$;\s]*:[$;\s]*;/g) {
5150                         my $ctx = '';
5151                         my $herectx = $here . "\n";
5152                         my $cnt = statement_rawlines($stat);
5153                         for (my $n = 0; $n < $cnt; $n++) {
5154                                 $herectx .= raw_line($linenr, $n) . "\n";
5155                         }
5156                         WARN("DEFAULT_NO_BREAK",
5157                              "switch default: should use break\n" . $herectx);
5158                 }
5159
5160 # check for gcc specific __FUNCTION__
5161                 if ($line =~ /\b__FUNCTION__\b/) {
5162                         if (WARN("USE_FUNC",
5163                                  "__func__ should be used instead of gcc specific __FUNCTION__\n"  . $herecurr) &&
5164                             $fix) {
5165                                 $fixed[$fixlinenr] =~ s/\b__FUNCTION__\b/__func__/g;
5166                         }
5167                 }
5168
5169 # check for uses of __DATE__, __TIME__, __TIMESTAMP__
5170                 while ($line =~ /\b(__(?:DATE|TIME|TIMESTAMP)__)\b/g) {
5171                         ERROR("DATE_TIME",
5172                               "Use of the '$1' macro makes the build non-deterministic\n" . $herecurr);
5173                 }
5174
5175 # check for use of yield()
5176                 if ($line =~ /\byield\s*\(\s*\)/) {
5177                         WARN("YIELD",
5178                              "Using yield() is generally wrong. See yield() kernel-doc (sched/core.c)\n"  . $herecurr);
5179                 }
5180
5181 # check for comparisons against true and false
5182                 if ($line =~ /\+\s*(.*?)\b(true|false|$Lval)\s*(==|\!=)\s*(true|false|$Lval)\b(.*)$/i) {
5183                         my $lead = $1;
5184                         my $arg = $2;
5185                         my $test = $3;
5186                         my $otype = $4;
5187                         my $trail = $5;
5188                         my $op = "!";
5189
5190                         ($arg, $otype) = ($otype, $arg) if ($arg =~ /^(?:true|false)$/i);
5191
5192                         my $type = lc($otype);
5193                         if ($type =~ /^(?:true|false)$/) {
5194                                 if (("$test" eq "==" && "$type" eq "true") ||
5195                                     ("$test" eq "!=" && "$type" eq "false")) {
5196                                         $op = "";
5197                                 }
5198
5199                                 CHK("BOOL_COMPARISON",
5200                                     "Using comparison to $otype is error prone\n" . $herecurr);
5201
5202 ## maybe suggesting a correct construct would better
5203 ##                                  "Using comparison to $otype is error prone.  Perhaps use '${lead}${op}${arg}${trail}'\n" . $herecurr);
5204
5205                         }
5206                 }
5207
5208 # check for semaphores initialized locked
5209                 if ($line =~ /^.\s*sema_init.+,\W?0\W?\)/) {
5210                         WARN("CONSIDER_COMPLETION",
5211                              "consider using a completion\n" . $herecurr);
5212                 }
5213
5214 # recommend kstrto* over simple_strto* and strict_strto*
5215                 if ($line =~ /\b((simple|strict)_(strto(l|ll|ul|ull)))\s*\(/) {
5216                         WARN("CONSIDER_KSTRTO",
5217                              "$1 is obsolete, use k$3 instead\n" . $herecurr);
5218                 }
5219
5220 # check for __initcall(), use device_initcall() explicitly or more appropriate function please
5221                 if ($line =~ /^.\s*__initcall\s*\(/) {
5222                         WARN("USE_DEVICE_INITCALL",
5223                              "please use device_initcall() or more appropriate function instead of __initcall() (see include/linux/init.h)\n" . $herecurr);
5224                 }
5225
5226 # check for various structs that are normally const (ops, kgdb, device_tree)
5227                 my $const_structs = qr{
5228                                 acpi_dock_ops|
5229                                 address_space_operations|
5230                                 backlight_ops|
5231                                 block_device_operations|
5232                                 dentry_operations|
5233                                 dev_pm_ops|
5234                                 dma_map_ops|
5235                                 extent_io_ops|
5236                                 file_lock_operations|
5237                                 file_operations|
5238                                 hv_ops|
5239                                 ide_dma_ops|
5240                                 intel_dvo_dev_ops|
5241                                 item_operations|
5242                                 iwl_ops|
5243                                 kgdb_arch|
5244                                 kgdb_io|
5245                                 kset_uevent_ops|
5246                                 lock_manager_operations|
5247                                 microcode_ops|
5248                                 mtrr_ops|
5249                                 neigh_ops|
5250                                 nlmsvc_binding|
5251                                 of_device_id|
5252                                 pci_raw_ops|
5253                                 pipe_buf_operations|
5254                                 platform_hibernation_ops|
5255                                 platform_suspend_ops|
5256                                 proto_ops|
5257                                 rpc_pipe_ops|
5258                                 seq_operations|
5259                                 snd_ac97_build_ops|
5260                                 soc_pcmcia_socket_ops|
5261                                 stacktrace_ops|
5262                                 sysfs_ops|
5263                                 tty_operations|
5264                                 usb_mon_operations|
5265                                 wd_ops}x;
5266                 if ($line !~ /\bconst\b/ &&
5267                     $line =~ /\bstruct\s+($const_structs)\b/) {
5268                         WARN("CONST_STRUCT",
5269                              "struct $1 should normally be const\n" .
5270                                 $herecurr);
5271                 }
5272
5273 # use of NR_CPUS is usually wrong
5274 # ignore definitions of NR_CPUS and usage to define arrays as likely right
5275                 if ($line =~ /\bNR_CPUS\b/ &&
5276                     $line !~ /^.\s*\s*#\s*if\b.*\bNR_CPUS\b/ &&
5277                     $line !~ /^.\s*\s*#\s*define\b.*\bNR_CPUS\b/ &&
5278                     $line !~ /^.\s*$Declare\s.*\[[^\]]*NR_CPUS[^\]]*\]/ &&
5279                     $line !~ /\[[^\]]*\.\.\.[^\]]*NR_CPUS[^\]]*\]/ &&
5280                     $line !~ /\[[^\]]*NR_CPUS[^\]]*\.\.\.[^\]]*\]/)
5281                 {
5282                         WARN("NR_CPUS",
5283                              "usage of NR_CPUS is often wrong - consider using cpu_possible(), num_possible_cpus(), for_each_possible_cpu(), etc\n" . $herecurr);
5284                 }
5285
5286 # Use of __ARCH_HAS_<FOO> or ARCH_HAVE_<BAR> is wrong.
5287                 if ($line =~ /\+\s*#\s*define\s+((?:__)?ARCH_(?:HAS|HAVE)\w*)\b/) {
5288                         ERROR("DEFINE_ARCH_HAS",
5289                               "#define of '$1' is wrong - use Kconfig variables or standard guards instead\n" . $herecurr);
5290                 }
5291
5292 # likely/unlikely comparisons similar to "(likely(foo) > 0)"
5293                 if ($^V && $^V ge 5.10.0 &&
5294                     $line =~ /\b((?:un)?likely)\s*\(\s*$FuncArg\s*\)\s*$Compare/) {
5295                         WARN("LIKELY_MISUSE",
5296                              "Using $1 should generally have parentheses around the comparison\n" . $herecurr);
5297                 }
5298
5299 # whine mightly about in_atomic
5300                 if ($line =~ /\bin_atomic\s*\(/) {
5301                         if ($realfile =~ m@^drivers/@) {
5302                                 ERROR("IN_ATOMIC",
5303                                       "do not use in_atomic in drivers\n" . $herecurr);
5304                         } elsif ($realfile !~ m@^kernel/@) {
5305                                 WARN("IN_ATOMIC",
5306                                      "use of in_atomic() is incorrect outside core kernel code\n" . $herecurr);
5307                         }
5308                 }
5309
5310 # check for lockdep_set_novalidate_class
5311                 if ($line =~ /^.\s*lockdep_set_novalidate_class\s*\(/ ||
5312                     $line =~ /__lockdep_no_validate__\s*\)/ ) {
5313                         if ($realfile !~ m@^kernel/lockdep@ &&
5314                             $realfile !~ m@^include/linux/lockdep@ &&
5315                             $realfile !~ m@^drivers/base/core@) {
5316                                 ERROR("LOCKDEP",
5317                                       "lockdep_no_validate class is reserved for device->mutex.\n" . $herecurr);
5318                         }
5319                 }
5320
5321                 if ($line =~ /debugfs_create_file.*S_IWUGO/ ||
5322                     $line =~ /DEVICE_ATTR.*S_IWUGO/ ) {
5323                         WARN("EXPORTED_WORLD_WRITABLE",
5324                              "Exporting world writable files is usually an error. Consider more restrictive permissions.\n" . $herecurr);
5325                 }
5326
5327 # Mode permission misuses where it seems decimal should be octal
5328 # This uses a shortcut match to avoid unnecessary uses of a slow foreach loop
5329                 if ($^V && $^V ge 5.10.0 &&
5330                     $line =~ /$mode_perms_search/) {
5331                         foreach my $entry (@mode_permission_funcs) {
5332                                 my $func = $entry->[0];
5333                                 my $arg_pos = $entry->[1];
5334
5335                                 my $skip_args = "";
5336                                 if ($arg_pos > 1) {
5337                                         $arg_pos--;
5338                                         $skip_args = "(?:\\s*$FuncArg\\s*,\\s*){$arg_pos,$arg_pos}";
5339                                 }
5340                                 my $test = "\\b$func\\s*\\(${skip_args}([\\d]+)\\s*[,\\)]";
5341                                 if ($line =~ /$test/) {
5342                                         my $val = $1;
5343                                         $val = $6 if ($skip_args ne "");
5344
5345                                         if ($val !~ /^0$/ &&
5346                                             (($val =~ /^$Int$/ && $val !~ /^$Octal$/) ||
5347                                              length($val) ne 4)) {
5348                                                 ERROR("NON_OCTAL_PERMISSIONS",
5349                                                       "Use 4 digit octal (0777) not decimal permissions\n" . $herecurr);
5350                                         } elsif ($val =~ /^$Octal$/ && (oct($val) & 02)) {
5351                                                 ERROR("EXPORTED_WORLD_WRITABLE",
5352                                                       "Exporting writable files is usually an error. Consider more restrictive permissions.\n" . $herecurr);
5353                                         }
5354                                 }
5355                         }
5356                 }
5357         }
5358
5359         # If we have no input at all, then there is nothing to report on
5360         # so just keep quiet.
5361         if ($#rawlines == -1) {
5362                 exit(0);
5363         }
5364
5365         # In mailback mode only produce a report in the negative, for
5366         # things that appear to be patches.
5367         if ($mailback && ($clean == 1 || !$is_patch)) {
5368                 exit(0);
5369         }
5370
5371         # This is not a patch, and we are are in 'no-patch' mode so
5372         # just keep quiet.
5373         if (!$chk_patch && !$is_patch) {
5374                 exit(0);
5375         }
5376
5377         if (!$is_patch) {
5378                 ERROR("NOT_UNIFIED_DIFF",
5379                       "Does not appear to be a unified-diff format patch\n");
5380         }
5381         if ($is_patch && $chk_signoff && $signoff == 0) {
5382                 ERROR("MISSING_SIGN_OFF",
5383                       "Missing Signed-off-by: line(s)\n");
5384         }
5385
5386         print report_dump();
5387         if ($summary && !($clean == 1 && $quiet == 1)) {
5388                 print "$filename " if ($summary_file);
5389                 print "total: $cnt_error errors, $cnt_warn warnings, " .
5390                         (($check)? "$cnt_chk checks, " : "") .
5391                         "$cnt_lines lines checked\n";
5392                 print "\n" if ($quiet == 0);
5393         }
5394
5395         if ($quiet == 0) {
5396
5397                 if ($^V lt 5.10.0) {
5398                         print("NOTE: perl $^V is not modern enough to detect all possible issues.\n");
5399                         print("An upgrade to at least perl v5.10.0 is suggested.\n\n");
5400                 }
5401
5402                 # If there were whitespace errors which cleanpatch can fix
5403                 # then suggest that.
5404                 if ($rpt_cleaners) {
5405                         print "NOTE: whitespace errors detected, you may wish to use scripts/cleanpatch or\n";
5406                         print "      scripts/cleanfile\n\n";
5407                         $rpt_cleaners = 0;
5408                 }
5409         }
5410
5411         hash_show_words(\%use_type, "Used");
5412         hash_show_words(\%ignore_type, "Ignored");
5413
5414         if ($clean == 0 && $fix &&
5415             ("@rawlines" ne "@fixed" ||
5416              $#fixed_inserted >= 0 || $#fixed_deleted >= 0)) {
5417                 my $newfile = $filename;
5418                 $newfile .= ".EXPERIMENTAL-checkpatch-fixes" if (!$fix_inplace);
5419                 my $linecount = 0;
5420                 my $f;
5421
5422                 @fixed = fix_inserted_deleted_lines(\@fixed, \@fixed_inserted, \@fixed_deleted);
5423
5424                 open($f, '>', $newfile)
5425                     or die "$P: Can't open $newfile for write\n";
5426                 foreach my $fixed_line (@fixed) {
5427                         $linecount++;
5428                         if ($file) {
5429                                 if ($linecount > 3) {
5430                                         $fixed_line =~ s/^\+//;
5431                                         print $f $fixed_line . "\n";
5432                                 }
5433                         } else {
5434                                 print $f $fixed_line . "\n";
5435                         }
5436                 }
5437                 close($f);
5438
5439                 if (!$quiet) {
5440                         print << "EOM";
5441 Wrote EXPERIMENTAL --fix correction(s) to '$newfile'
5442
5443 Do _NOT_ trust the results written to this file.
5444 Do _NOT_ submit these changes without inspecting them for correctness.
5445
5446 This EXPERIMENTAL file is simply a convenience to help rewrite patches.
5447 No warranties, expressed or implied...
5448
5449 EOM
5450                 }
5451         }
5452
5453         if ($clean == 1 && $quiet == 0) {
5454                 print "$vname has no obvious style problems and is ready for submission.\n"
5455         }
5456         if ($clean == 0 && $quiet == 0) {
5457                 print << "EOM";
5458 $vname has style problems, please review.
5459
5460 If any of these errors are false positives, please report
5461 them to the maintainer, see CHECKPATCH in MAINTAINERS.
5462 EOM
5463         }
5464
5465         return $clean;
5466 }