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
  10 my $P = $0;
  11 $P =~ s@.*/@@g;
  12
  13 my $V = '0.32';
  14
  15 use Getopt::Long qw(:config no_auto_abbrev);
  16
  17 my $quiet = 0;
  18 my $tree = 1;
  19 my $chk_signoff = 1;
  20 my $chk_patch = 1;
  21 my $tst_only;
  22 my $emacs = 0;
  23 my $terse = 0;
  24 my $file = 0;
  25 my $check = 0;
  26 my $summary = 1;
  27 my $mailback = 0;
  28 my $summary_file = 0;
  29 my $show_types = 0;
  30 my $root;
  31 my %debug;
  32 my %ignore_type = ();
  33 my @ignore = ();
  34 my $help = 0;
  35 my $configuration_file = ".checkpatch.conf";
  36
  37 sub help {
  38         my ($exitcode) = @_;
  39
  40         print << "EOM";
  41 Usage: $P [OPTION]... [FILE]...
  42 Version: $V
  43
  44 Options:
  45   -q, --quiet                quiet
  46   --no-tree                  run without a kernel tree
  47   --no-signoff               do not check for 'Signed-off-by' line
  48   --patch                    treat FILE as patchfile (default)
  49   --emacs                    emacs compile window format
  50   --terse                    one line per report
  51   -f, --file                 treat FILE as regular source file
  52   --subjective, --strict     enable more subjective tests
  53   --ignore TYPE(,TYPE2...)   ignore various comma separated message types
  54   --show-types               show the message "types" in the output
  55   --root=PATH                PATH to the kernel tree root
  56   --no-summary               suppress the per-file summary
  57   --mailback                 only produce a report in case of warnings/errors
  58   --summary-file             include the filename in summary
  59   --debug KEY=[0|1]          turn on/off debugging of KEY, where KEY is one of
  60                              'values', 'possible', 'type', and 'attr' (default
  61                              is all off)
  62   --test-only=WORD           report only warnings/errors containing WORD
  63                              literally
  64   -h, --help, --version      display this help and exit
  65
  66 When FILE is - read standard input.
  67 EOM
  68
  69         exit($exitcode);
  70 }
  71
  72 my $conf = which_conf($configuration_file);
  73 if (-f $conf) {
  74         my @conf_args;
  75         open(my $conffile, '<', "$conf")
  76             or warn "$P: Can't find a readable $configuration_file file $!\n";
  77
  78         while (<$conffile>) {
  79                 my $line = $_;
  80
  81                 $line =~ s/\s*\n?$//g;
  82                 $line =~ s/^\s*//g;
  83                 $line =~ s/\s+/ /g;
  84
  85                 next if ($line =~ m/^\s*#/);
  86                 next if ($line =~ m/^\s*$/);
  87
  88                 my @words = split(" ", $line);
  89                 foreach my $word (@words) {
  90                         last if ($word =~ m/^#/);
  91                         push (@conf_args, $word);
  92                 }
  93         }
  94         close($conffile);
  95         unshift(@ARGV, @conf_args) if @conf_args;
  96 }
  97
  98 GetOptions(
  99         'q|quiet+'      => \$quiet,
 100         'tree!'         => \$tree,
 101         'signoff!'      => \$chk_signoff,
 102         'patch!'        => \$chk_patch,
 103         'emacs!'        => \$emacs,
 104         'terse!'        => \$terse,
 105         'f|file!'       => \$file,
 106         'subjective!'   => \$check,
 107         'strict!'       => \$check,
 108         'ignore=s'      => \@ignore,
 109         'show-types!'   => \$show_types,
 110         'root=s'        => \$root,
 111         'summary!'      => \$summary,
 112         'mailback!'     => \$mailback,
 113         'summary-file!' => \$summary_file,
 114
 115         'debug=s'       => \%debug,
 116         'test-only=s'   => \$tst_only,
 117         'h|help'        => \$help,
 118         'version'       => \$help
 119 ) or help(1);
 120
 121 help(0) if ($help);
 122
 123 my $exit = 0;
 124
 125 if ($#ARGV < 0) {
 126         print "$P: no input files\n";
 127         exit(1);
 128 }
 129
 130 @ignore = split(/,/, join(',',@ignore));
 131 foreach my $word (@ignore) {
 132         $word =~ s/\s*\n?$//g;
 133         $word =~ s/^\s*//g;
 134         $word =~ s/\s+/ /g;
 135         $word =~ tr/[a-z]/[A-Z]/;
 136
 137         next if ($word =~ m/^\s*#/);
 138         next if ($word =~ m/^\s*$/);
 139
 140         $ignore_type{$word}++;
 141 }
 142
 143 my $dbg_values = 0;
 144 my $dbg_possible = 0;
 145 my $dbg_type = 0;
 146 my $dbg_attr = 0;
 147 for my $key (keys %debug) {
 148         ## no critic
 149         eval "\${dbg_$key} = '$debug{$key}';";
 150         die "$@" if ($@);
 151 }
 152
 153 my $rpt_cleaners = 0;
 154
 155 if ($terse) {
 156         $emacs = 1;
 157         $quiet++;
 158 }
 159
 160 if ($tree) {
 161         if (defined $root) {
 162                 if (!top_of_kernel_tree($root)) {
 163                         die "$P: $root: --root does not point at a valid tree\n";
 164                 }
 165         } else {
 166                 if (top_of_kernel_tree('.')) {
 167                         $root = '.';
 168                 } elsif ($0 =~ m@(.*)/scripts/[^/]*$@ &&
 169                                                 top_of_kernel_tree($1)) {
 170                         $root = $1;
 171                 }
 172         }
 173
 174         if (!defined $root) {
 175                 print "Must be run from the top-level dir. of a kernel tree\n";
 176                 exit(2);
 177         }
 178 }
 179
 180 my $emitted_corrupt = 0;
 181
 182 our $Ident      = qr{
 183                         [A-Za-z_][A-Za-z\d_]*
 184                         (?:\s*\#\#\s*[A-Za-z_][A-Za-z\d_]*)*
 185                 }x;
 186 our $Storage    = qr{extern|static|asmlinkage};
 187 our $Sparse     = qr{
 188                         __user|
 189                         __kernel|
 190                         __force|
 191                         __iomem|
 192                         __must_check|
 193                         __init_refok|
 194                         __kprobes|
 195                         __ref|
 196                         __rcu
 197                 }x;
 198
 199 # Notes to $Attribute:
 200 # We need \b after 'init' otherwise 'initconst' will cause a false positive in a check
 201 our $Attribute  = qr{
 202                         const|
 203                         __percpu|
 204                         __nocast|
 205                         __safe|
 206                         __bitwise__|
 207                         __packed__|
 208                         __packed2__|
 209                         __naked|
 210                         __maybe_unused|
 211                         __always_unused|
 212                         __noreturn|
 213                         __used|
 214                         __cold|
 215                         __noclone|
 216                         __deprecated|
 217                         __read_mostly|
 218                         __kprobes|
 219                         __(?:mem|cpu|dev|)(?:initdata|initconst|init\b)|
 220                         ____cacheline_aligned|
 221                         ____cacheline_aligned_in_smp|
 222                         ____cacheline_internodealigned_in_smp|
 223                         __weak
 224                   }x;
 225 our $Modifier;
 226 our $Inline     = qr{inline|__always_inline|noinline};
 227 our $Member     = qr{->$Ident|\.$Ident|\[[^]]*\]};
 228 our $Lval       = qr{$Ident(?:$Member)*};
 229
 230 our $Constant   = qr{(?i:(?:[0-9]+|0x[0-9a-f]+)[ul]*)};
 231 our $Assignment = qr{(?:\*\=|/=|%=|\+=|-=|<<=|>>=|&=|\^=|\|=|=)};
 232 our $Compare    = qr{<=|>=|==|!=|<|>};
 233 our $Operators  = qr{
 234                         <=|>=|==|!=|
 235                         =>|->|<<|>>|<|>|!|~|
 236                         &&|\|\||,|\^|\+\+|--|&|\||\+|-|\*|\/|%
 237                   }x;
 238
 239 our $NonptrType;
 240 our $Type;
 241 our $Declare;
 242
 243 our $NON_ASCII_UTF8     = qr{
 244         [\xC2-\xDF][\x80-\xBF]               # non-overlong 2-byte
 245         |  \xE0[\xA0-\xBF][\x80-\xBF]        # excluding overlongs
 246         | [\xE1-\xEC\xEE\xEF][\x80-\xBF]{2}  # straight 3-byte
 247         |  \xED[\x80-\x9F][\x80-\xBF]        # excluding surrogates
 248         |  \xF0[\x90-\xBF][\x80-\xBF]{2}     # planes 1-3
 249         | [\xF1-\xF3][\x80-\xBF]{3}          # planes 4-15
 250         |  \xF4[\x80-\x8F][\x80-\xBF]{2}     # plane 16
 251 }x;
 252
 253 our $UTF8       = qr{
 254         [\x09\x0A\x0D\x20-\x7E]              # ASCII
 255         | $NON_ASCII_UTF8
 256 }x;
 257
 258 our $typeTypedefs = qr{(?x:
 259         (?:__)?(?:u|s|be|le)(?:8|16|32|64)|
 260         atomic_t
 261 )};
 262
 263 our $logFunctions = qr{(?x:
 264         printk(?:_ratelimited|_once|)|
 265         [a-z0-9]+_(?:printk|emerg|alert|crit|err|warning|warn|notice|info|debug|dbg|vdbg|devel|cont|WARN)(?:_ratelimited|_once|)|
 266         WARN(?:_RATELIMIT|_ONCE|)|
 267         panic|
 268         MODULE_[A-Z_]+
 269 )};
 270
 271 our $signature_tags = qr{(?xi:
 272         Signed-off-by:|
 273         Acked-by:|
 274         Tested-by:|
 275         Reviewed-by:|
 276         Reported-by:|
 277         To:|
 278         Cc:
 279 )};
 280
 281 our @typeList = (
 282         qr{void},
 283         qr{(?:unsigned\s+)?char},
 284         qr{(?:unsigned\s+)?short},
 285         qr{(?:unsigned\s+)?int},
 286         qr{(?:unsigned\s+)?long},
 287         qr{(?:unsigned\s+)?long\s+int},
 288         qr{(?:unsigned\s+)?long\s+long},
 289         qr{(?:unsigned\s+)?long\s+long\s+int},
 290         qr{unsigned},
 291         qr{float},
 292         qr{double},
 293         qr{bool},
 294         qr{struct\s+$Ident},
 295         qr{union\s+$Ident},
 296         qr{enum\s+$Ident},
 297         qr{${Ident}_t},
 298         qr{${Ident}_handler},
 299         qr{${Ident}_handler_fn},
 300 );
 301 our @modifierList = (
 302         qr{fastcall},
 303 );
 304
 305 our $allowed_asm_includes = qr{(?x:
 306         irq|
 307         memory
 308 )};
 309 # memory.h: ARM has a custom one
 310
 311 sub build_types {
 312         my $mods = "(?x:  \n" . join("|\n  ", @modifierList) . "\n)";
 313         my $all = "(?x:  \n" . join("|\n  ", @typeList) . "\n)";
 314         $Modifier       = qr{(?:$Attribute|$Sparse|$mods)};
 315         $NonptrType     = qr{
 316                         (?:$Modifier\s+|const\s+)*
 317                         (?:
 318                                 (?:typeof|__typeof__)\s*\(\s*\**\s*$Ident\s*\)|
 319                                 (?:$typeTypedefs\b)|
 320                                 (?:${all}\b)
 321                         )
 322                         (?:\s+$Modifier|\s+const)*
 323                   }x;
 324         $Type   = qr{
 325                         $NonptrType
 326                         (?:[\s\*]+\s*const|[\s\*]+|(?:\s*\[\s*\])+)?
 327                         (?:\s+$Inline|\s+$Modifier)*
 328                   }x;
 329         $Declare        = qr{(?:$Storage\s+)?$Type};
 330 }
 331 build_types();
 332
 333 our $match_balanced_parentheses = qr/(\((?:[^\(\)]+|(-1))*\))/;
 334
 335 our $Typecast   = qr{\s*(\(\s*$NonptrType\s*\)){0,1}\s*};
 336 our $LvalOrFunc = qr{($Lval)\s*($match_balanced_parentheses{0,1})\s*};
 337 our $FuncArg = qr{$Typecast{0,1}($LvalOrFunc|$Constant)};
 338
 339 sub deparenthesize {
 340         my ($string) = @_;
 341         return "" if (!defined($string));
 342         $string =~ s@^\s*\(\s*@@g;
 343         $string =~ s@\s*\)\s*$@@g;
 344         $string =~ s@\s+@ @g;
 345         return $string;
 346 }
 347
 348 $chk_signoff = 0 if ($file);
 349
 350 my @dep_includes = ();
 351 my @dep_functions = ();
 352 my $removal = "Documentation/feature-removal-schedule.txt";
 353 if ($tree && -f "$root/$removal") {
 354         open(my $REMOVE, '<', "$root/$removal") ||
 355                                 die "$P: $removal: open failed - $!\n";
 356         while (<$REMOVE>) {
 357                 if (/^Check:\s+(.*\S)/) {
 358                         for my $entry (split(/[, ]+/, $1)) {
 359                                 if ($entry =~ m@include/(.*)@) {
 360                                         push(@dep_includes, $1);
 361
 362                                 } elsif ($entry !~ m@/@) {
 363                                         push(@dep_functions, $entry);
 364                                 }
 365                         }
 366                 }
 367         }
 368         close($REMOVE);
 369 }
 370
 371 my @rawlines = ();
 372 my @lines = ();
 373 my $vname;
 374 for my $filename (@ARGV) {
 375         my $FILE;
 376         if ($file) {
 377                 open($FILE, '-|', "diff -u /dev/null $filename") ||
 378                         die "$P: $filename: diff failed - $!\n";
 379         } elsif ($filename eq '-') {
 380                 open($FILE, '<&STDIN');
 381         } else {
 382                 open($FILE, '<', "$filename") ||
 383                         die "$P: $filename: open failed - $!\n";
 384         }
 385         if ($filename eq '-') {
 386                 $vname = 'Your patch';
 387         } else {
 388                 $vname = $filename;
 389         }
 390         while (<$FILE>) {
 391                 chomp;
 392                 push(@rawlines, $_);
 393         }
 394         close($FILE);
 395         if (!process($filename)) {
 396                 $exit = 1;
 397         }
 398         @rawlines = ();
 399         @lines = ();
 400 }
 401
 402 exit($exit);
 403
 404 sub top_of_kernel_tree {
 405         my ($root) = @_;
 406
 407         my @tree_check = (
 408                 "COPYING", "CREDITS", "Kbuild", "MAINTAINERS", "Makefile",
 409                 "README", "Documentation", "arch", "include", "drivers",
 410                 "fs", "init", "ipc", "kernel", "lib", "scripts",
 411         );
 412
 413         foreach my $check (@tree_check) {
 414                 if (! -e $root . '/' . $check) {
 415                         return 0;
 416                 }
 417         }
 418         return 1;
 419     }
 420
 421 sub parse_email {
 422         my ($formatted_email) = @_;
 423
 424         my $name = "";
 425         my $address = "";
 426         my $comment = "";
 427
 428         if ($formatted_email =~ /^(.*)<(\S+\@\S+)>(.*)$/) {
 429                 $name = $1;
 430                 $address = $2;
 431                 $comment = $3 if defined $3;
 432         } elsif ($formatted_email =~ /^\s*<(\S+\@\S+)>(.*)$/) {
 433                 $address = $1;
 434                 $comment = $2 if defined $2;
 435         } elsif ($formatted_email =~ /(\S+\@\S+)(.*)$/) {
 436                 $address = $1;
 437                 $comment = $2 if defined $2;
 438                 $formatted_email =~ s/$address.*$//;
 439                 $name = $formatted_email;
 440                 $name =~ s/^\s+|\s+$//g;
 441                 $name =~ s/^\"|\"$//g;
 442                 # If there's a name left after stripping spaces and
 443                 # leading quotes, and the address doesn't have both
 444                 # leading and trailing angle brackets, the address
 445                 # is invalid. ie:
 446                 #   "joe smith joe@smith.com" bad
 447                 #   "joe smith <joe@smith.com" bad
 448                 if ($name ne "" && $address !~ /^<[^>]+>$/) {
 449                         $name = "";
 450                         $address = "";
 451                         $comment = "";
 452                 }
 453         }
 454
 455         $name =~ s/^\s+|\s+$//g;
 456         $name =~ s/^\"|\"$//g;
 457         $address =~ s/^\s+|\s+$//g;
 458         $address =~ s/^\<|\>$//g;
 459
 460         if ($name =~ /[^\w \-]/i) { ##has "must quote" chars
 461                 $name =~ s/(?<!\\)"/\\"/g; ##escape quotes
 462                 $name = "\"$name\"";
 463         }
 464
 465         return ($name, $address, $comment);
 466 }
 467
 468 sub format_email {
 469         my ($name, $address) = @_;
 470
 471         my $formatted_email;
 472
 473         $name =~ s/^\s+|\s+$//g;
 474         $name =~ s/^\"|\"$//g;
 475         $address =~ s/^\s+|\s+$//g;
 476
 477         if ($name =~ /[^\w \-]/i) { ##has "must quote" chars
 478                 $name =~ s/(?<!\\)"/\\"/g; ##escape quotes
 479                 $name = "\"$name\"";
 480         }
 481
 482         if ("$name" eq "") {
 483                 $formatted_email = "$address";
 484         } else {
 485                 $formatted_email = "$name <$address>";
 486         }
 487
 488         return $formatted_email;
 489 }
 490
 491 sub which_conf {
 492         my ($conf) = @_;
 493
 494         foreach my $path (split(/:/, ".:$ENV{HOME}:.scripts")) {
 495                 if (-e "$path/$conf") {
 496                         return "$path/$conf";
 497                 }
 498         }
 499
 500         return "";
 501 }
 502
 503 sub expand_tabs {
 504         my ($str) = @_;
 505
 506         my $res = '';
 507         my $n = 0;
 508         for my $c (split(//, $str)) {
 509                 if ($c eq "\t") {
 510                         $res .= ' ';
 511                         $n++;
 512                         for (; ($n % 8) != 0; $n++) {
 513                                 $res .= ' ';
 514                         }
 515                         next;
 516                 }
 517                 $res .= $c;
 518                 $n++;
 519         }
 520
 521         return $res;
 522 }
 523 sub copy_spacing {
 524         (my $res = shift) =~ tr/\t/ /c;
 525         return $res;
 526 }
 527
 528 sub line_stats {
 529         my ($line) = @_;
 530
 531         # Drop the diff line leader and expand tabs
 532         $line =~ s/^.//;
 533         $line = expand_tabs($line);
 534
 535         # Pick the indent from the front of the line.
 536         my ($white) = ($line =~ /^(\s*)/);
 537
 538         return (length($line), length($white));
 539 }
 540
 541 my $sanitise_quote = '';
 542
 543 sub sanitise_line_reset {
 544         my ($in_comment) = @_;
 545
 546         if ($in_comment) {
 547                 $sanitise_quote = '*/';
 548         } else {
 549                 $sanitise_quote = '';
 550         }
 551 }
 552 sub sanitise_line {
 553         my ($line) = @_;
 554
 555         my $res = '';
 556         my $l = '';
 557
 558         my $qlen = 0;
 559         my $off = 0;
 560         my $c;
 561
 562         # Always copy over the diff marker.
 563         $res = substr($line, 0, 1);
 564
 565         for ($off = 1; $off < length($line); $off++) {
 566                 $c = substr($line, $off, 1);
 567
 568                 # Comments we are wacking completly including the begin
 569                 # and end, all to $;.
 570                 if ($sanitise_quote eq '' && substr($line, $off, 2) eq '/*') {
 571                         $sanitise_quote = '*/';
 572
 573                         substr($res, $off, 2, "$;$;");
 574                         $off++;
 575                         next;
 576                 }
 577                 if ($sanitise_quote eq '*/' && substr($line, $off, 2) eq '*/') {
 578                         $sanitise_quote = '';
 579                         substr($res, $off, 2, "$;$;");
 580                         $off++;
 581                         next;
 582                 }
 583                 if ($sanitise_quote eq '' && substr($line, $off, 2) eq '//') {
 584                         $sanitise_quote = '//';
 585
 586                         substr($res, $off, 2, $sanitise_quote);
 587                         $off++;
 588                         next;
 589                 }
 590
 591                 # A \ in a string means ignore the next character.
 592                 if (($sanitise_quote eq "'" || $sanitise_quote eq '"') &&
 593                     $c eq "\\") {
 594                         substr($res, $off, 2, 'XX');
 595                         $off++;
 596                         next;
 597                 }
 598                 # Regular quotes.
 599                 if ($c eq "'" || $c eq '"') {
 600                         if ($sanitise_quote eq '') {
 601                                 $sanitise_quote = $c;
 602
 603                                 substr($res, $off, 1, $c);
 604                                 next;
 605                         } elsif ($sanitise_quote eq $c) {
 606                                 $sanitise_quote = '';
 607                         }
 608                 }
 609
 610                 #print "c<$c> SQ<$sanitise_quote>\n";
 611                 if ($off != 0 && $sanitise_quote eq '*/' && $c ne "\t") {
 612                         substr($res, $off, 1, $;);
 613                 } elsif ($off != 0 && $sanitise_quote eq '//' && $c ne "\t") {
 614                         substr($res, $off, 1, $;);
 615                 } elsif ($off != 0 && $sanitise_quote && $c ne "\t") {
 616                         substr($res, $off, 1, 'X');
 617                 } else {
 618                         substr($res, $off, 1, $c);
 619                 }
 620         }
 621
 622         if ($sanitise_quote eq '//') {
 623                 $sanitise_quote = '';
 624         }
 625
 626         # The pathname on a #include may be surrounded by '<' and '>'.
 627         if ($res =~ /^.\s*\#\s*include\s+\<(.*)\>/) {
 628                 my $clean = 'X' x length($1);
 629                 $res =~ s@\<.*\>@<$clean>@;
 630
 631         # The whole of a #error is a string.
 632         } elsif ($res =~ /^.\s*\#\s*(?:error|warning)\s+(.*)\b/) {
 633                 my $clean = 'X' x length($1);
 634                 $res =~ s@(\#\s*(?:error|warning)\s+).*@$1$clean@;
 635         }
 636
 637         return $res;
 638 }
 639
 640 sub ctx_statement_block {
 641         my ($linenr, $remain, $off) = @_;
 642         my $line = $linenr - 1;
 643         my $blk = '';
 644         my $soff = $off;
 645         my $coff = $off - 1;
 646         my $coff_set = 0;
 647
 648         my $loff = 0;
 649
 650         my $type = '';
 651         my $level = 0;
 652         my @stack = ();
 653         my $p;
 654         my $c;
 655         my $len = 0;
 656
 657         my $remainder;
 658         while (1) {
 659                 @stack = (['', 0]) if ($#stack == -1);
 660
 661                 #warn "CSB: blk<$blk> remain<$remain>\n";
 662                 # If we are about to drop off the end, pull in more
 663                 # context.
 664                 if ($off >= $len) {
 665                         for (; $remain > 0; $line++) {
 666                                 last if (!defined $lines[$line]);
 667                                 next if ($lines[$line] =~ /^-/);
 668                                 $remain--;
 669                                 $loff = $len;
 670                                 $blk .= $lines[$line] . "\n";
 671                                 $len = length($blk);
 672                                 $line++;
 673                                 last;
 674                         }
 675                         # Bail if there is no further context.
 676                         #warn "CSB: blk<$blk> off<$off> len<$len>\n";
 677                         if ($off >= $len) {
 678                                 last;
 679                         }
 680                         if ($level == 0 && substr($blk, $off) =~ /^.\s*#\s*define/) {
 681                                 $level++;
 682                                 $type = '#';
 683                         }
 684                 }
 685                 $p = $c;
 686                 $c = substr($blk, $off, 1);
 687                 $remainder = substr($blk, $off);
 688
 689                 #warn "CSB: c<$c> type<$type> level<$level> remainder<$remainder> coff_set<$coff_set>\n";
 690
 691                 # Handle nested #if/#else.
 692                 if ($remainder =~ /^#\s*(?:ifndef|ifdef|if)\s/) {
 693                         push(@stack, [ $type, $level ]);
 694                 } elsif ($remainder =~ /^#\s*(?:else|elif)\b/) {
 695                         ($type, $level) = @{$stack[$#stack - 1]};
 696                 } elsif ($remainder =~ /^#\s*endif\b/) {
 697                         ($type, $level) = @{pop(@stack)};
 698                 }
 699
 700                 # Statement ends at the ';' or a close '}' at the
 701                 # outermost level.
 702                 if ($level == 0 && $c eq ';') {
 703                         last;
 704                 }
 705
 706                 # An else is really a conditional as long as its not else if
 707                 if ($level == 0 && $coff_set == 0 &&
 708                                 (!defined($p) || $p =~ /(?:\s|\}|\+)/) &&
 709                                 $remainder =~ /^(else)(?:\s|{)/ &&
 710                                 $remainder !~ /^else\s+if\b/) {
 711                         $coff = $off + length($1) - 1;
 712                         $coff_set = 1;
 713                         #warn "CSB: mark coff<$coff> soff<$soff> 1<$1>\n";
 714                         #warn "[" . substr($blk, $soff, $coff - $soff + 1) . "]\n";
 715                 }
 716
 717                 if (($type eq '' || $type eq '(') && $c eq '(') {
 718                         $level++;
 719                         $type = '(';
 720                 }
 721                 if ($type eq '(' && $c eq ')') {
 722                         $level--;
 723                         $type = ($level != 0)? '(' : '';
 724
 725                         if ($level == 0 && $coff < $soff) {
 726                                 $coff = $off;
 727                                 $coff_set = 1;
 728                                 #warn "CSB: mark coff<$coff>\n";
 729                         }
 730                 }
 731                 if (($type eq '' || $type eq '{') && $c eq '{') {
 732                         $level++;
 733                         $type = '{';
 734                 }
 735                 if ($type eq '{' && $c eq '}') {
 736                         $level--;
 737                         $type = ($level != 0)? '{' : '';
 738
 739                         if ($level == 0) {
 740                                 if (substr($blk, $off + 1, 1) eq ';') {
 741                                         $off++;
 742                                 }
 743                                 last;
 744                         }
 745                 }
 746                 # Preprocessor commands end at the newline unless escaped.
 747                 if ($type eq '#' && $c eq "\n" && $p ne "\\") {
 748                         $level--;
 749                         $type = '';
 750                         $off++;
 751                         last;
 752                 }
 753                 $off++;
 754         }
 755         # We are truly at the end, so shuffle to the next line.
 756         if ($off == $len) {
 757                 $loff = $len + 1;
 758                 $line++;
 759                 $remain--;
 760         }
 761
 762         my $statement = substr($blk, $soff, $off - $soff + 1);
 763         my $condition = substr($blk, $soff, $coff - $soff + 1);
 764
 765         #warn "STATEMENT<$statement>\n";
 766         #warn "CONDITION<$condition>\n";
 767
 768         #print "coff<$coff> soff<$off> loff<$loff>\n";
 769
 770         return ($statement, $condition,
 771                         $line, $remain + 1, $off - $loff + 1, $level);
 772 }
 773
 774 sub statement_lines {
 775         my ($stmt) = @_;
 776
 777         # Strip the diff line prefixes and rip blank lines at start and end.
 778         $stmt =~ s/(^|\n)./$1/g;
 779         $stmt =~ s/^\s*//;
 780         $stmt =~ s/\s*$//;
 781
 782         my @stmt_lines = ($stmt =~ /\n/g);
 783
 784         return $#stmt_lines + 2;
 785 }
 786
 787 sub statement_rawlines {
 788         my ($stmt) = @_;
 789
 790         my @stmt_lines = ($stmt =~ /\n/g);
 791
 792         return $#stmt_lines + 2;
 793 }
 794
 795 sub statement_block_size {
 796         my ($stmt) = @_;
 797
 798         $stmt =~ s/(^|\n)./$1/g;
 799         $stmt =~ s/^\s*{//;
 800         $stmt =~ s/}\s*$//;
 801         $stmt =~ s/^\s*//;
 802         $stmt =~ s/\s*$//;
 803
 804         my @stmt_lines = ($stmt =~ /\n/g);
 805         my @stmt_statements = ($stmt =~ /;/g);
 806
 807         my $stmt_lines = $#stmt_lines + 2;
 808         my $stmt_statements = $#stmt_statements + 1;
 809
 810         if ($stmt_lines > $stmt_statements) {
 811                 return $stmt_lines;
 812         } else {
 813                 return $stmt_statements;
 814         }
 815 }
 816
 817 sub ctx_statement_full {
 818         my ($linenr, $remain, $off) = @_;
 819         my ($statement, $condition, $level);
 820
 821         my (@chunks);
 822
 823         # Grab the first conditional/block pair.
 824         ($statement, $condition, $linenr, $remain, $off, $level) =
 825                                 ctx_statement_block($linenr, $remain, $off);
 826         #print "F: c<$condition> s<$statement> remain<$remain>\n";
 827         push(@chunks, [ $condition, $statement ]);
 828         if (!($remain > 0 && $condition =~ /^\s*(?:\n[+-])?\s*(?:if|else|do)\b/s)) {
 829                 return ($level, $linenr, @chunks);
 830         }
 831
 832         # Pull in the following conditional/block pairs and see if they
 833         # could continue the statement.
 834         for (;;) {
 835                 ($statement, $condition, $linenr, $remain, $off, $level) =
 836                                 ctx_statement_block($linenr, $remain, $off);
 837                 #print "C: c<$condition> s<$statement> remain<$remain>\n";
 838                 last if (!($remain > 0 && $condition =~ /^(?:\s*\n[+-])*\s*(?:else|do)\b/s));
 839                 #print "C: push\n";
 840                 push(@chunks, [ $condition, $statement ]);
 841         }
 842
 843         return ($level, $linenr, @chunks);
 844 }
 845
 846 sub ctx_block_get {
 847         my ($linenr, $remain, $outer, $open, $close, $off) = @_;
 848         my $line;
 849         my $start = $linenr - 1;
 850         my $blk = '';
 851         my @o;
 852         my @c;
 853         my @res = ();
 854
 855         my $level = 0;
 856         my @stack = ($level);
 857         for ($line = $start; $remain > 0; $line++) {
 858                 next if ($rawlines[$line] =~ /^-/);
 859                 $remain--;
 860
 861                 $blk .= $rawlines[$line];
 862
 863                 # Handle nested #if/#else.
 864                 if ($lines[$line] =~ /^.\s*#\s*(?:ifndef|ifdef|if)\s/) {
 865                         push(@stack, $level);
 866                 } elsif ($lines[$line] =~ /^.\s*#\s*(?:else|elif)\b/) {
 867                         $level = $stack[$#stack - 1];
 868                 } elsif ($lines[$line] =~ /^.\s*#\s*endif\b/) {
 869                         $level = pop(@stack);
 870                 }
 871
 872                 foreach my $c (split(//, $lines[$line])) {
 873                         ##print "C<$c>L<$level><$open$close>O<$off>\n";
 874                         if ($off > 0) {
 875                                 $off--;
 876                                 next;
 877                         }
 878
 879                         if ($c eq $close && $level > 0) {
 880                                 $level--;
 881                                 last if ($level == 0);
 882                         } elsif ($c eq $open) {
 883                                 $level++;
 884                         }
 885                 }
 886
 887                 if (!$outer || $level <= 1) {
 888                         push(@res, $rawlines[$line]);
 889                 }
 890
 891                 last if ($level == 0);
 892         }
 893
 894         return ($level, @res);
 895 }
 896 sub ctx_block_outer {
 897         my ($linenr, $remain) = @_;
 898
 899         my ($level, @r) = ctx_block_get($linenr, $remain, 1, '{', '}', 0);
 900         return @r;
 901 }
 902 sub ctx_block {
 903         my ($linenr, $remain) = @_;
 904
 905         my ($level, @r) = ctx_block_get($linenr, $remain, 0, '{', '}', 0);
 906         return @r;
 907 }
 908 sub ctx_statement {
 909         my ($linenr, $remain, $off) = @_;
 910
 911         my ($level, @r) = ctx_block_get($linenr, $remain, 0, '(', ')', $off);
 912         return @r;
 913 }
 914 sub ctx_block_level {
 915         my ($linenr, $remain) = @_;
 916
 917         return ctx_block_get($linenr, $remain, 0, '{', '}', 0);
 918 }
 919 sub ctx_statement_level {
 920         my ($linenr, $remain, $off) = @_;
 921
 922         return ctx_block_get($linenr, $remain, 0, '(', ')', $off);
 923 }
 924
 925 sub ctx_locate_comment {
 926         my ($first_line, $end_line) = @_;
 927
 928         # Catch a comment on the end of the line itself.
 929         my ($current_comment) = ($rawlines[$end_line - 1] =~ m@.*(/\*.*\*/)\s*(?:\\\s*)?$@);
 930         return $current_comment if (defined $current_comment);
 931
 932         # Look through the context and try and figure out if there is a
 933         # comment.
 934         my $in_comment = 0;
 935         $current_comment = '';
 936         for (my $linenr = $first_line; $linenr < $end_line; $linenr++) {
 937                 my $line = $rawlines[$linenr - 1];
 938                 #warn "           $line\n";
 939                 if ($linenr == $first_line and $line =~ m@^.\s*\*@) {
 940                         $in_comment = 1;
 941                 }
 942                 if ($line =~ m@/\*@) {
 943                         $in_comment = 1;
 944                 }
 945                 if (!$in_comment && $current_comment ne '') {
 946                         $current_comment = '';
 947                 }
 948                 $current_comment .= $line . "\n" if ($in_comment);
 949                 if ($line =~ m@\*/@) {
 950                         $in_comment = 0;
 951                 }
 952         }
 953
 954         chomp($current_comment);
 955         return($current_comment);
 956 }
 957 sub ctx_has_comment {
 958         my ($first_line, $end_line) = @_;
 959         my $cmt = ctx_locate_comment($first_line, $end_line);
 960
 961         ##print "LINE: $rawlines[$end_line - 1 ]\n";
 962         ##print "CMMT: $cmt\n";
 963
 964         return ($cmt ne '');
 965 }
 966
 967 sub raw_line {
 968         my ($linenr, $cnt) = @_;
 969
 970         my $offset = $linenr - 1;
 971         $cnt++;
 972
 973         my $line;
 974         while ($cnt) {
 975                 $line = $rawlines[$offset++];
 976                 next if (defined($line) && $line =~ /^-/);
 977                 $cnt--;
 978         }
 979
 980         return $line;
 981 }
 982
 983 sub cat_vet {
 984         my ($vet) = @_;
 985         my ($res, $coded);
 986
 987         $res = '';
 988         while ($vet =~ /([^[:cntrl:]]*)([[:cntrl:]]|$)/g) {
 989                 $res .= $1;
 990                 if ($2 ne '') {
 991                         $coded = sprintf("^%c", unpack('C', $2) + 64);
 992                         $res .= $coded;
 993                 }
 994         }
 995         $res =~ s/$/\$/;
 996
 997         return $res;
 998 }
 999
1000 my $av_preprocessor = 0;
1001 my $av_pending;
1002 my @av_paren_type;
1003 my $av_pend_colon;
1004
1005 sub annotate_reset {
1006         $av_preprocessor = 0;
1007         $av_pending = '_';
1008         @av_paren_type = ('E');
1009         $av_pend_colon = 'O';
1010 }
1011
1012 sub annotate_values {
1013         my ($stream, $type) = @_;
1014
1015         my $res;
1016         my $var = '_' x length($stream);
1017         my $cur = $stream;
1018
1019         print "$stream\n" if ($dbg_values > 1);
1020
1021         while (length($cur)) {
1022                 @av_paren_type = ('E') if ($#av_paren_type < 0);
1023                 print " <" . join('', @av_paren_type) .
1024                                 "> <$type> <$av_pending>" if ($dbg_values > 1);
1025                 if ($cur =~ /^(\s+)/o) {
1026                         print "WS($1)\n" if ($dbg_values > 1);
1027                         if ($1 =~ /\n/ && $av_preprocessor) {
1028                                 $type = pop(@av_paren_type);
1029                                 $av_preprocessor = 0;
1030                         }
1031
1032                 } elsif ($cur =~ /^(\(\s*$Type\s*)\)/ && $av_pending eq '_') {
1033                         print "CAST($1)\n" if ($dbg_values > 1);
1034                         push(@av_paren_type, $type);
1035                         $type = 'C';
1036
1037                 } elsif ($cur =~ /^($Type)\s*(?:$Ident|,|\)|\(|\s*$)/) {
1038                         print "DECLARE($1)\n" if ($dbg_values > 1);
1039                         $type = 'T';
1040
1041                 } elsif ($cur =~ /^($Modifier)\s*/) {
1042                         print "MODIFIER($1)\n" if ($dbg_values > 1);
1043                         $type = 'T';
1044
1045                 } elsif ($cur =~ /^(\#\s*define\s*$Ident)(\(?)/o) {
1046                         print "DEFINE($1,$2)\n" if ($dbg_values > 1);
1047                         $av_preprocessor = 1;
1048                         push(@av_paren_type, $type);
1049                         if ($2 ne '') {
1050                                 $av_pending = 'N';
1051                         }
1052                         $type = 'E';
1053
1054                 } elsif ($cur =~ /^(\#\s*(?:undef\s*$Ident|include\b))/o) {
1055                         print "UNDEF($1)\n" if ($dbg_values > 1);
1056                         $av_preprocessor = 1;
1057                         push(@av_paren_type, $type);
1058
1059                 } elsif ($cur =~ /^(\#\s*(?:ifdef|ifndef|if))/o) {
1060                         print "PRE_START($1)\n" if ($dbg_values > 1);
1061                         $av_preprocessor = 1;
1062
1063                         push(@av_paren_type, $type);
1064                         push(@av_paren_type, $type);
1065                         $type = 'E';
1066
1067                 } elsif ($cur =~ /^(\#\s*(?:else|elif))/o) {
1068                         print "PRE_RESTART($1)\n" if ($dbg_values > 1);
1069                         $av_preprocessor = 1;
1070
1071                         push(@av_paren_type, $av_paren_type[$#av_paren_type]);
1072
1073                         $type = 'E';
1074
1075                 } elsif ($cur =~ /^(\#\s*(?:endif))/o) {
1076                         print "PRE_END($1)\n" if ($dbg_values > 1);
1077
1078                         $av_preprocessor = 1;
1079
1080                         # Assume all arms of the conditional end as this
1081                         # one does, and continue as if the #endif was not here.
1082                         pop(@av_paren_type);
1083                         push(@av_paren_type, $type);
1084                         $type = 'E';
1085
1086                 } elsif ($cur =~ /^(\\\n)/o) {
1087                         print "PRECONT($1)\n" if ($dbg_values > 1);
1088
1089                 } elsif ($cur =~ /^(__attribute__)\s*\(?/o) {
1090                         print "ATTR($1)\n" if ($dbg_values > 1);
1091                         $av_pending = $type;
1092                         $type = 'N';
1093
1094                 } elsif ($cur =~ /^(sizeof)\s*(\()?/o) {
1095                         print "SIZEOF($1)\n" if ($dbg_values > 1);
1096                         if (defined $2) {
1097                                 $av_pending = 'V';
1098                         }
1099                         $type = 'N';
1100
1101                 } elsif ($cur =~ /^(if|while|for)\b/o) {
1102                         print "COND($1)\n" if ($dbg_values > 1);
1103                         $av_pending = 'E';
1104                         $type = 'N';
1105
1106                 } elsif ($cur =~/^(case)/o) {
1107                         print "CASE($1)\n" if ($dbg_values > 1);
1108                         $av_pend_colon = 'C';
1109                         $type = 'N';
1110
1111                 } elsif ($cur =~/^(return|else|goto|typeof|__typeof__)\b/o) {
1112                         print "KEYWORD($1)\n" if ($dbg_values > 1);
1113                         $type = 'N';
1114
1115                 } elsif ($cur =~ /^(\()/o) {
1116                         print "PAREN('$1')\n" if ($dbg_values > 1);
1117                         push(@av_paren_type, $av_pending);
1118                         $av_pending = '_';
1119                         $type = 'N';
1120
1121                 } elsif ($cur =~ /^(\))/o) {
1122                         my $new_type = pop(@av_paren_type);
1123                         if ($new_type ne '_') {
1124                                 $type = $new_type;
1125                                 print "PAREN('$1') -> $type\n"
1126                                                         if ($dbg_values > 1);
1127                         } else {
1128                                 print "PAREN('$1')\n" if ($dbg_values > 1);
1129                         }
1130
1131                 } elsif ($cur =~ /^($Ident)\s*\(/o) {
1132                         print "FUNC($1)\n" if ($dbg_values > 1);
1133                         $type = 'V';
1134                         $av_pending = 'V';
1135
1136                 } elsif ($cur =~ /^($Ident\s*):(?:\s*\d+\s*(,|=|;))?/) {
1137                         if (defined $2 && $type eq 'C' || $type eq 'T') {
1138                                 $av_pend_colon = 'B';
1139                         } elsif ($type eq 'E') {
1140                                 $av_pend_colon = 'L';
1141                         }
1142                         print "IDENT_COLON($1,$type>$av_pend_colon)\n" if ($dbg_values > 1);
1143                         $type = 'V';
1144
1145                 } elsif ($cur =~ /^($Ident|$Constant)/o) {
1146                         print "IDENT($1)\n" if ($dbg_values > 1);
1147                         $type = 'V';
1148
1149                 } elsif ($cur =~ /^($Assignment)/o) {
1150                         print "ASSIGN($1)\n" if ($dbg_values > 1);
1151                         $type = 'N';
1152
1153                 } elsif ($cur =~/^(;|{|})/) {
1154                         print "END($1)\n" if ($dbg_values > 1);
1155                         $type = 'E';
1156                         $av_pend_colon = 'O';
1157
1158                 } elsif ($cur =~/^(,)/) {
1159                         print "COMMA($1)\n" if ($dbg_values > 1);
1160                         $type = 'C';
1161
1162                 } elsif ($cur =~ /^(\?)/o) {
1163                         print "QUESTION($1)\n" if ($dbg_values > 1);
1164                         $type = 'N';
1165
1166                 } elsif ($cur =~ /^(:)/o) {
1167                         print "COLON($1,$av_pend_colon)\n" if ($dbg_values > 1);
1168
1169                         substr($var, length($res), 1, $av_pend_colon);
1170                         if ($av_pend_colon eq 'C' || $av_pend_colon eq 'L') {
1171                                 $type = 'E';
1172                         } else {
1173                                 $type = 'N';
1174                         }
1175                         $av_pend_colon = 'O';
1176
1177                 } elsif ($cur =~ /^(\[)/o) {
1178                         print "CLOSE($1)\n" if ($dbg_values > 1);
1179                         $type = 'N';
1180
1181                 } elsif ($cur =~ /^(-(?![->])|\+(?!\+)|\*|\&\&|\&)/o) {
1182                         my $variant;
1183
1184                         print "OPV($1)\n" if ($dbg_values > 1);
1185                         if ($type eq 'V') {
1186                                 $variant = 'B';
1187                         } else {
1188                                 $variant = 'U';
1189                         }
1190
1191                         substr($var, length($res), 1, $variant);
1192                         $type = 'N';
1193
1194                 } elsif ($cur =~ /^($Operators)/o) {
1195                         print "OP($1)\n" if ($dbg_values > 1);
1196                         if ($1 ne '++' && $1 ne '--') {
1197                                 $type = 'N';
1198                         }
1199
1200                 } elsif ($cur =~ /(^.)/o) {
1201                         print "C($1)\n" if ($dbg_values > 1);
1202                 }
1203                 if (defined $1) {
1204                         $cur = substr($cur, length($1));
1205                         $res .= $type x length($1);
1206                 }
1207         }
1208
1209         return ($res, $var);
1210 }
1211
1212 sub possible {
1213         my ($possible, $line) = @_;
1214         my $notPermitted = qr{(?:
1215                 ^(?:
1216                         $Modifier|
1217                         $Storage|
1218                         $Type|
1219                         DEFINE_\S+
1220                 )$|
1221                 ^(?:
1222                         goto|
1223                         return|
1224                         case|
1225                         else|
1226                         asm|__asm__|
1227                         do|
1228                         \#|
1229                         \#\#|
1230                 )(?:\s|$)|
1231                 ^(?:typedef|struct|enum)\b
1232             )}x;
1233         warn "CHECK<$possible> ($line)\n" if ($dbg_possible > 2);
1234         if ($possible !~ $notPermitted) {
1235                 # Check for modifiers.
1236                 $possible =~ s/\s*$Storage\s*//g;
1237                 $possible =~ s/\s*$Sparse\s*//g;
1238                 if ($possible =~ /^\s*$/) {
1239
1240                 } elsif ($possible =~ /\s/) {
1241                         $possible =~ s/\s*$Type\s*//g;
1242                         for my $modifier (split(' ', $possible)) {
1243                                 if ($modifier !~ $notPermitted) {
1244                                         warn "MODIFIER: $modifier ($possible) ($line)\n" if ($dbg_possible);
1245                                         push(@modifierList, $modifier);
1246                                 }
1247                         }
1248
1249                 } else {
1250                         warn "POSSIBLE: $possible ($line)\n" if ($dbg_possible);
1251                         push(@typeList, $possible);
1252                 }
1253                 build_types();
1254         } else {
1255                 warn "NOTPOSS: $possible ($line)\n" if ($dbg_possible > 1);
1256         }
1257 }
1258
1259 my $prefix = '';
1260
1261 sub show_type {
1262        return !defined $ignore_type{$_[0]};
1263 }
1264
1265 sub report {
1266         if (!show_type($_[1]) ||
1267             (defined $tst_only && $_[2] !~ /\Q$tst_only\E/)) {
1268                 return 0;
1269         }
1270         my $line;
1271         if ($show_types) {
1272                 $line = "$prefix$_[0]:$_[1]: $_[2]\n";
1273         } else {
1274                 $line = "$prefix$_[0]: $_[2]\n";
1275         }
1276         $line = (split('\n', $line))[0] . "\n" if ($terse);
1277
1278         push(our @report, $line);
1279
1280         return 1;
1281 }
1282 sub report_dump {
1283         our @report;
1284 }
1285
1286 sub ERROR {
1287         if (report("ERROR", $_[0], $_[1])) {
1288                 our $clean = 0;
1289                 our $cnt_error++;
1290         }
1291 }
1292 sub WARN {
1293         if (report("WARNING", $_[0], $_[1])) {
1294                 our $clean = 0;
1295                 our $cnt_warn++;
1296         }
1297 }
1298 sub CHK {
1299         if ($check && report("CHECK", $_[0], $_[1])) {
1300                 our $clean = 0;
1301                 our $cnt_chk++;
1302         }
1303 }
1304
1305 sub check_absolute_file {
1306         my ($absolute, $herecurr) = @_;
1307         my $file = $absolute;
1308
1309         ##print "absolute<$absolute>\n";
1310
1311         # See if any suffix of this path is a path within the tree.
1312         while ($file =~ s@^[^/]*/@@) {
1313                 if (-f "$root/$file") {
1314                         ##print "file<$file>\n";
1315                         last;
1316                 }
1317         }
1318         if (! -f _)  {
1319                 return 0;
1320         }
1321
1322         # It is, so see if the prefix is acceptable.
1323         my $prefix = $absolute;
1324         substr($prefix, -length($file)) = '';
1325
1326         ##print "prefix<$prefix>\n";
1327         if ($prefix ne ".../") {
1328                 WARN("USE_RELATIVE_PATH",
1329                      "use relative pathname instead of absolute in changelog text\n" . $herecurr);
1330         }
1331 }
1332
1333 sub process {
1334         my $filename = shift;
1335
1336         my $linenr=0;
1337         my $prevline="";
1338         my $prevrawline="";
1339         my $stashline="";
1340         my $stashrawline="";
1341
1342         my $length;
1343         my $indent;
1344         my $previndent=0;
1345         my $stashindent=0;
1346
1347         our $clean = 1;
1348         my $signoff = 0;
1349         my $is_patch = 0;
1350
1351         my $in_header_lines = 1;
1352         my $in_commit_log = 0;          #Scanning lines before patch
1353
1354         our @report = ();
1355         our $cnt_lines = 0;
1356         our $cnt_error = 0;
1357         our $cnt_warn = 0;
1358         our $cnt_chk = 0;
1359
1360         # Trace the real file/line as we go.
1361         my $realfile = '';
1362         my $realline = 0;
1363         my $realcnt = 0;
1364         my $here = '';
1365         my $in_comment = 0;
1366         my $comment_edge = 0;
1367         my $first_line = 0;
1368         my $p1_prefix = '';
1369
1370         my $prev_values = 'E';
1371
1372         # suppression flags
1373         my %suppress_ifbraces;
1374         my %suppress_whiletrailers;
1375         my %suppress_export;
1376         my $suppress_statement = 0;
1377
1378         # Pre-scan the patch sanitizing the lines.
1379         # Pre-scan the patch looking for any __setup documentation.
1380         #
1381         my @setup_docs = ();
1382         my $setup_docs = 0;
1383
1384         sanitise_line_reset();
1385         my $line;
1386         foreach my $rawline (@rawlines) {
1387                 $linenr++;
1388                 $line = $rawline;
1389
1390                 if ($rawline=~/^\+\+\+\s+(\S+)/) {
1391                         $setup_docs = 0;
1392                         if ($1 =~ m@Documentation/kernel-parameters.txt$@) {
1393                                 $setup_docs = 1;
1394                         }
1395                         #next;
1396                 }
1397                 if ($rawline=~/^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@/) {
1398                         $realline=$1-1;
1399                         if (defined $2) {
1400                                 $realcnt=$3+1;
1401                         } else {
1402                                 $realcnt=1+1;
1403                         }
1404                         $in_comment = 0;
1405
1406                         # Guestimate if this is a continuing comment.  Run
1407                         # the context looking for a comment "edge".  If this
1408                         # edge is a close comment then we must be in a comment
1409                         # at context start.
1410                         my $edge;
1411                         my $cnt = $realcnt;
1412                         for (my $ln = $linenr + 1; $cnt > 0; $ln++) {
1413                                 next if (defined $rawlines[$ln - 1] &&
1414                                          $rawlines[$ln - 1] =~ /^-/);
1415                                 $cnt--;
1416                                 #print "RAW<$rawlines[$ln - 1]>\n";
1417                                 last if (!defined $rawlines[$ln - 1]);
1418                                 if ($rawlines[$ln - 1] =~ m@(/\*|\*/)@ &&
1419                                     $rawlines[$ln - 1] !~ m@"[^"]*(?:/\*|\*/)[^"]*"@) {
1420                                         ($edge) = $1;
1421                                         last;
1422                                 }
1423                         }
1424                         if (defined $edge && $edge eq '*/') {
1425                                 $in_comment = 1;
1426                         }
1427
1428                         # Guestimate if this is a continuing comment.  If this
1429                         # is the start of a diff block and this line starts
1430                         # ' *' then it is very likely a comment.
1431                         if (!defined $edge &&
1432                             $rawlines[$linenr] =~ m@^.\s*(?:\*\*+| \*)(?:\s|$)@)
1433                         {
1434                                 $in_comment = 1;
1435                         }
1436
1437                         ##print "COMMENT:$in_comment edge<$edge> $rawline\n";
1438                         sanitise_line_reset($in_comment);
1439
1440                 } elsif ($realcnt && $rawline =~ /^(?:\+| |$)/) {
1441                         # Standardise the strings and chars within the input to
1442                         # simplify matching -- only bother with positive lines.
1443                         $line = sanitise_line($rawline);
1444                 }
1445                 push(@lines, $line);
1446
1447                 if ($realcnt > 1) {
1448                         $realcnt-- if ($line =~ /^(?:\+| |$)/);
1449                 } else {
1450                         $realcnt = 0;
1451                 }
1452
1453                 #print "==>$rawline\n";
1454                 #print "-->$line\n";
1455
1456                 if ($setup_docs && $line =~ /^\+/) {
1457                         push(@setup_docs, $line);
1458                 }
1459         }
1460
1461         $prefix = '';
1462
1463         $realcnt = 0;
1464         $linenr = 0;
1465         foreach my $line (@lines) {
1466                 $linenr++;
1467
1468                 my $rawline = $rawlines[$linenr - 1];
1469
1470 #extract the line range in the file after the patch is applied
1471                 if ($line=~/^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@/) {
1472                         $is_patch = 1;
1473                         $first_line = $linenr + 1;
1474                         $realline=$1-1;
1475                         if (defined $2) {
1476                                 $realcnt=$3+1;
1477                         } else {
1478                                 $realcnt=1+1;
1479                         }
1480                         annotate_reset();
1481                         $prev_values = 'E';
1482
1483                         %suppress_ifbraces = ();
1484                         %suppress_whiletrailers = ();
1485                         %suppress_export = ();
1486                         $suppress_statement = 0;
1487                         next;
1488
1489 # track the line number as we move through the hunk, note that
1490 # new versions of GNU diff omit the leading space on completely
1491 # blank context lines so we need to count that too.
1492                 } elsif ($line =~ /^( |\+|$)/) {
1493                         $realline++;
1494                         $realcnt-- if ($realcnt != 0);
1495
1496                         # Measure the line length and indent.
1497                         ($length, $indent) = line_stats($rawline);
1498
1499                         # Track the previous line.
1500                         ($prevline, $stashline) = ($stashline, $line);
1501                         ($previndent, $stashindent) = ($stashindent, $indent);
1502                         ($prevrawline, $stashrawline) = ($stashrawline, $rawline);
1503
1504                         #warn "line<$line>\n";
1505
1506                 } elsif ($realcnt == 1) {
1507                         $realcnt--;
1508                 }
1509
1510                 my $hunk_line = ($realcnt != 0);
1511
1512 #make up the handle for any error we report on this line
1513                 $prefix = "$filename:$realline: " if ($emacs && $file);
1514                 $prefix = "$filename:$linenr: " if ($emacs && !$file);
1515
1516                 $here = "#$linenr: " if (!$file);
1517                 $here = "#$realline: " if ($file);
1518
1519                 # extract the filename as it passes
1520                 if ($line =~ /^diff --git.*?(\S+)$/) {
1521                         $realfile = $1;
1522                         $realfile =~ s@^([^/]*)/@@;
1523                         $in_commit_log = 0;
1524                 } elsif ($line =~ /^\+\+\+\s+(\S+)/) {
1525                         $realfile = $1;
1526                         $realfile =~ s@^([^/]*)/@@;
1527                         $in_commit_log = 0;
1528
1529                         $p1_prefix = $1;
1530                         if (!$file && $tree && $p1_prefix ne '' &&
1531                             -e "$root/$p1_prefix") {
1532                                 WARN("PATCH_PREFIX",
1533                                      "patch prefix '$p1_prefix' exists, appears to be a -p0 patch\n");
1534                         }
1535
1536                         if ($realfile =~ m@^include/asm/@) {
1537                                 ERROR("MODIFIED_INCLUDE_ASM",
1538                                       "do not modify files in include/asm, change architecture specific files in include/asm-<architecture>\n" . "$here$rawline\n");
1539                         }
1540                         next;
1541                 }
1542
1543                 $here .= "FILE: $realfile:$realline:" if ($realcnt != 0);
1544
1545                 my $hereline = "$here\n$rawline\n";
1546                 my $herecurr = "$here\n$rawline\n";
1547                 my $hereprev = "$here\n$prevrawline\n$rawline\n";
1548
1549                 $cnt_lines++ if ($realcnt != 0);
1550
1551 # Check for incorrect file permissions
1552                 if ($line =~ /^new (file )?mode.*[7531]\d{0,2}$/) {
1553                         my $permhere = $here . "FILE: $realfile\n";
1554                         if ($realfile =~ /(Makefile|Kconfig|\.c|\.h|\.S|\.tmpl)$/) {
1555                                 ERROR("EXECUTE_PERMISSIONS",
1556                                       "do not set execute permissions for source files\n" . $permhere);
1557                         }
1558                 }
1559
1560 # Check the patch for a signoff:
1561                 if ($line =~ /^\s*signed-off-by:/i) {
1562                         $signoff++;
1563                         $in_commit_log = 0;
1564                 }
1565
1566 # Check signature styles
1567                 if (!$in_header_lines &&
1568                     $line =~ /^(\s*)($signature_tags)(\s*)(.*)/) {
1569                         my $space_before = $1;
1570                         my $sign_off = $2;
1571                         my $space_after = $3;
1572                         my $email = $4;
1573                         my $ucfirst_sign_off = ucfirst(lc($sign_off));
1574
1575                         if (defined $space_before && $space_before ne "") {
1576                                 WARN("BAD_SIGN_OFF",
1577                                      "Do not use whitespace before $ucfirst_sign_off\n" . $herecurr);
1578                         }
1579                         if ($sign_off =~ /-by:$/i && $sign_off ne $ucfirst_sign_off) {
1580                                 WARN("BAD_SIGN_OFF",
1581                                      "'$ucfirst_sign_off' is the preferred signature form\n" . $herecurr);
1582                         }
1583                         if (!defined $space_after || $space_after ne " ") {
1584                                 WARN("BAD_SIGN_OFF",
1585                                      "Use a single space after $ucfirst_sign_off\n" . $herecurr);
1586                         }
1587
1588                         my ($email_name, $email_address, $comment) = parse_email($email);
1589                         my $suggested_email = format_email(($email_name, $email_address));
1590                         if ($suggested_email eq "") {
1591                                 ERROR("BAD_SIGN_OFF",
1592                                       "Unrecognized email address: '$email'\n" . $herecurr);
1593                         } else {
1594                                 my $dequoted = $suggested_email;
1595                                 $dequoted =~ s/^"//;
1596                                 $dequoted =~ s/" </ </;
1597                                 # Don't force email to have quotes
1598                                 # Allow just an angle bracketed address
1599                                 if ("$dequoted$comment" ne $email &&
1600                                     "<$email_address>$comment" ne $email &&
1601                                     "$suggested_email$comment" ne $email) {
1602                                         WARN("BAD_SIGN_OFF",
1603                                              "email address '$email' might be better as '$suggested_email$comment'\n" . $herecurr);
1604                                 }
1605                         }
1606                 }
1607
1608 # Check for wrappage within a valid hunk of the file
1609                 if ($realcnt != 0 && $line !~ m{^(?:\+|-| |\\ No newline|$)}) {
1610                         ERROR("CORRUPTED_PATCH",
1611                               "patch seems to be corrupt (line wrapped?)\n" .
1612                                 $herecurr) if (!$emitted_corrupt++);
1613                 }
1614
1615 # Check for absolute kernel paths.
1616                 if ($tree) {
1617                         while ($line =~ m{(?:^|\s)(/\S*)}g) {
1618                                 my $file = $1;
1619
1620                                 if ($file =~ m{^(.*?)(?::\d+)+:?$} &&
1621                                     check_absolute_file($1, $herecurr)) {
1622                                         #
1623                                 } else {
1624                                         check_absolute_file($file, $herecurr);
1625                                 }
1626                         }
1627                 }
1628
1629 # UTF-8 regex found at http://www.w3.org/International/questions/qa-forms-utf-8.en.php
1630                 if (($realfile =~ /^$/ || $line =~ /^\+/) &&
1631                     $rawline !~ m/^$UTF8*$/) {
1632                         my ($utf8_prefix) = ($rawline =~ /^($UTF8*)/);
1633
1634                         my $blank = copy_spacing($rawline);
1635                         my $ptr = substr($blank, 0, length($utf8_prefix)) . "^";
1636                         my $hereptr = "$hereline$ptr\n";
1637
1638                         CHK("INVALID_UTF8",
1639                             "Invalid UTF-8, patch and commit message should be encoded in UTF-8\n" . $hereptr);
1640                 }
1641
1642 # Check if it's the start of a commit log
1643 # (not a header line and we haven't seen the patch filename)
1644                 if ($in_header_lines && $realfile =~ /^$/ &&
1645                     $rawline !~ /^(commit\b|from\b|[\w-]+:).+$/i) {
1646                         $in_header_lines = 0;
1647                         $in_commit_log = 1;
1648                 }
1649
1650 # Still not yet in a patch, check for any UTF-8
1651                 if ($in_commit_log && $realfile =~ /^$/ &&
1652                     $rawline =~ /$NON_ASCII_UTF8/) {
1653                         CHK("UTF8_BEFORE_PATCH",
1654                             "8-bit UTF-8 used in possible commit log\n" . $herecurr);
1655                 }
1656
1657 # ignore non-hunk lines and lines being removed
1658                 next if (!$hunk_line || $line =~ /^-/);
1659
1660 #trailing whitespace
1661                 if ($line =~ /^\+.*\015/) {
1662                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1663                         ERROR("DOS_LINE_ENDINGS",
1664                               "DOS line endings\n" . $herevet);
1665
1666                 } elsif ($rawline =~ /^\+.*\S\s+$/ || $rawline =~ /^\+\s+$/) {
1667                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1668                         ERROR("TRAILING_WHITESPACE",
1669                               "trailing whitespace\n" . $herevet);
1670                         $rpt_cleaners = 1;
1671                 }
1672
1673 # check for Kconfig help text having a real description
1674 # Only applies when adding the entry originally, after that we do not have
1675 # sufficient context to determine whether it is indeed long enough.
1676                 if ($realfile =~ /Kconfig/ &&
1677                     $line =~ /.\s*config\s+/) {
1678                         my $length = 0;
1679                         my $cnt = $realcnt;
1680                         my $ln = $linenr + 1;
1681                         my $f;
1682                         my $is_start = 0;
1683                         my $is_end = 0;
1684                         for (; $cnt > 0 && defined $lines[$ln - 1]; $ln++) {
1685                                 $f = $lines[$ln - 1];
1686                                 $cnt-- if ($lines[$ln - 1] !~ /^-/);
1687                                 $is_end = $lines[$ln - 1] =~ /^\+/;
1688
1689                                 next if ($f =~ /^-/);
1690
1691                                 if ($lines[$ln - 1] =~ /.\s*(?:bool|tristate)\s*\"/) {
1692                                         $is_start = 1;
1693                                 } elsif ($lines[$ln - 1] =~ /.\s*(?:---)?help(?:---)?$/) {
1694                                         $length = -1;
1695                                 }
1696
1697                                 $f =~ s/^.//;
1698                                 $f =~ s/#.*//;
1699                                 $f =~ s/^\s+//;
1700                                 next if ($f =~ /^$/);
1701                                 if ($f =~ /^\s*config\s/) {
1702                                         $is_end = 1;
1703                                         last;
1704                                 }
1705                                 $length++;
1706                         }
1707                         WARN("CONFIG_DESCRIPTION",
1708                              "please write a paragraph that describes the config symbol fully\n" . $herecurr) if ($is_start && $is_end && $length < 4);
1709                         #print "is_start<$is_start> is_end<$is_end> length<$length>\n";
1710                 }
1711
1712                 if (($realfile =~ /Makefile.*/ || $realfile =~ /Kbuild.*/) &&
1713                     ($line =~ /\+(EXTRA_[A-Z]+FLAGS).*/)) {
1714                         my $flag = $1;
1715                         my $replacement = {
1716                                 'EXTRA_AFLAGS' =>   'asflags-y',
1717                                 'EXTRA_CFLAGS' =>   'ccflags-y',
1718                                 'EXTRA_CPPFLAGS' => 'cppflags-y',
1719                                 'EXTRA_LDFLAGS' =>  'ldflags-y',
1720                         };
1721
1722                         WARN("DEPRECATED_VARIABLE",
1723                              "Use of $flag is deprecated, please use \`$replacement->{$flag} instead.\n" . $herecurr) if ($replacement->{$flag});
1724                 }
1725
1726 # check we are in a valid source file if not then ignore this hunk
1727                 next if ($realfile !~ /\.(h|c|s|S|pl|sh)$/);
1728
1729 #80 column limit
1730                 if ($line =~ /^\+/ && $prevrawline !~ /\/\*\*/ &&
1731                     $rawline !~ /^.\s*\*\s*\@$Ident\s/ &&
1732                     !($line =~ /^\+\s*$logFunctions\s*\(\s*(?:(KERN_\S+\s*|[^"]*))?"[X\t]*"\s*(?:|,|\)\s*;)\s*$/ ||
1733                     $line =~ /^\+\s*"[^"]*"\s*(?:\s*|,|\)\s*;)\s*$/) &&
1734                     $length > 80)
1735                 {
1736                         WARN("LONG_LINE",
1737                              "line over 80 characters\n" . $herecurr);
1738                 }
1739
1740 # check for spaces before a quoted newline
1741                 if ($rawline =~ /^.*\".*\s\\n/) {
1742                         WARN("QUOTED_WHITESPACE_BEFORE_NEWLINE",
1743                              "unnecessary whitespace before a quoted newline\n" . $herecurr);
1744                 }
1745
1746 # check for adding lines without a newline.
1747                 if ($line =~ /^\+/ && defined $lines[$linenr] && $lines[$linenr] =~ /^\\ No newline at end of file/) {
1748                         WARN("MISSING_EOF_NEWLINE",
1749                              "adding a line without newline at end of file\n" . $herecurr);
1750                 }
1751
1752 # Blackfin: use hi/lo macros
1753                 if ($realfile =~ m@arch/blackfin/.*\.S$@) {
1754                         if ($line =~ /\.[lL][[:space:]]*=.*&[[:space:]]*0x[fF][fF][fF][fF]/) {
1755                                 my $herevet = "$here\n" . cat_vet($line) . "\n";
1756                                 ERROR("LO_MACRO",
1757                                       "use the LO() macro, not (... & 0xFFFF)\n" . $herevet);
1758                         }
1759                         if ($line =~ /\.[hH][[:space:]]*=.*>>[[:space:]]*16/) {
1760                                 my $herevet = "$here\n" . cat_vet($line) . "\n";
1761                                 ERROR("HI_MACRO",
1762                                       "use the HI() macro, not (... >> 16)\n" . $herevet);
1763                         }
1764                 }
1765
1766 # check we are in a valid source file C or perl if not then ignore this hunk
1767                 next if ($realfile !~ /\.(h|c|pl)$/);
1768
1769 # at the beginning of a line any tabs must come first and anything
1770 # more than 8 must use tabs.
1771                 if ($rawline =~ /^\+\s* \t\s*\S/ ||
1772                     $rawline =~ /^\+\s*        \s*/) {
1773                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1774                         ERROR("CODE_INDENT",
1775                               "code indent should use tabs where possible\n" . $herevet);
1776                         $rpt_cleaners = 1;
1777                 }
1778
1779 # check for space before tabs.
1780                 if ($rawline =~ /^\+/ && $rawline =~ / \t/) {
1781                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1782                         WARN("SPACE_BEFORE_TAB",
1783                              "please, no space before tabs\n" . $herevet);
1784                 }
1785
1786 # check for spaces at the beginning of a line.
1787 # Exceptions:
1788 #  1) within comments
1789 #  2) indented preprocessor commands
1790 #  3) hanging labels
1791                 if ($rawline =~ /^\+ / && $line !~ /\+ *(?:$;|#|$Ident:)/)  {
1792                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1793                         WARN("LEADING_SPACE",
1794                              "please, no spaces at the start of a line\n" . $herevet);
1795                 }
1796
1797 # check we are in a valid C source file if not then ignore this hunk
1798                 next if ($realfile !~ /\.(h|c)$/);
1799
1800 # check for RCS/CVS revision markers
1801                 if ($rawline =~ /^\+.*\$(Revision|Log|Id)(?:\$|)/) {
1802                         WARN("CVS_KEYWORD",
1803                              "CVS style keyword markers, these will _not_ be updated\n". $herecurr);
1804                 }
1805
1806 # Blackfin: don't use __builtin_bfin_[cs]sync
1807                 if ($line =~ /__builtin_bfin_csync/) {
1808                         my $herevet = "$here\n" . cat_vet($line) . "\n";
1809                         ERROR("CSYNC",
1810                               "use the CSYNC() macro in asm/blackfin.h\n" . $herevet);
1811                 }
1812                 if ($line =~ /__builtin_bfin_ssync/) {
1813                         my $herevet = "$here\n" . cat_vet($line) . "\n";
1814                         ERROR("SSYNC",
1815                               "use the SSYNC() macro in asm/blackfin.h\n" . $herevet);
1816                 }
1817
1818 # Check for potential 'bare' types
1819                 my ($stat, $cond, $line_nr_next, $remain_next, $off_next,
1820                     $realline_next);
1821 #print "LINE<$line>\n";
1822                 if ($linenr >= $suppress_statement &&
1823                     $realcnt && $line =~ /.\s*\S/) {
1824                         ($stat, $cond, $line_nr_next, $remain_next, $off_next) =
1825                                 ctx_statement_block($linenr, $realcnt, 0);
1826                         $stat =~ s/\n./\n /g;
1827                         $cond =~ s/\n./\n /g;
1828
1829 #print "linenr<$linenr> <$stat>\n";
1830                         # If this statement has no statement boundaries within
1831                         # it there is no point in retrying a statement scan
1832                         # until we hit end of it.
1833                         my $frag = $stat; $frag =~ s/;+\s*$//;
1834                         if ($frag !~ /(?:{|;)/) {
1835 #print "skip<$line_nr_next>\n";
1836                                 $suppress_statement = $line_nr_next;
1837                         }
1838
1839                         # Find the real next line.
1840                         $realline_next = $line_nr_next;
1841                         if (defined $realline_next &&
1842                             (!defined $lines[$realline_next - 1] ||
1843                              substr($lines[$realline_next - 1], $off_next) =~ /^\s*$/)) {
1844                                 $realline_next++;
1845                         }
1846
1847                         my $s = $stat;
1848                         $s =~ s/{.*$//s;
1849
1850                         # Ignore goto labels.
1851                         if ($s =~ /$Ident:\*$/s) {
1852
1853                         # Ignore functions being called
1854                         } elsif ($s =~ /^.\s*$Ident\s*\(/s) {
1855
1856                         } elsif ($s =~ /^.\s*else\b/s) {
1857
1858                         # declarations always start with types
1859                         } elsif ($prev_values eq 'E' && $s =~ /^.\s*(?:$Storage\s+)?(?:$Inline\s+)?(?:const\s+)?((?:\s*$Ident)+?)\b(?:\s+$Sparse)?\s*\**\s*(?:$Ident|\(\*[^\)]*\))(?:\s*$Modifier)?\s*(?:;|=|,|\()/s) {
1860                                 my $type = $1;
1861                                 $type =~ s/\s+/ /g;
1862                                 possible($type, "A:" . $s);
1863
1864                         # definitions in global scope can only start with types
1865                         } elsif ($s =~ /^.(?:$Storage\s+)?(?:$Inline\s+)?(?:const\s+)?($Ident)\b\s*(?!:)/s) {
1866                                 possible($1, "B:" . $s);
1867                         }
1868
1869                         # any (foo ... *) is a pointer cast, and foo is a type
1870                         while ($s =~ /\(($Ident)(?:\s+$Sparse)*[\s\*]+\s*\)/sg) {
1871                                 possible($1, "C:" . $s);
1872                         }
1873
1874                         # Check for any sort of function declaration.
1875                         # int foo(something bar, other baz);
1876                         # void (*store_gdt)(x86_descr_ptr *);
1877                         if ($prev_values eq 'E' && $s =~ /^(.(?:typedef\s*)?(?:(?:$Storage|$Inline)\s*)*\s*$Type\s*(?:\b$Ident|\(\*\s*$Ident\))\s*)\(/s) {
1878                                 my ($name_len) = length($1);
1879
1880                                 my $ctx = $s;
1881                                 substr($ctx, 0, $name_len + 1, '');
1882                                 $ctx =~ s/\)[^\)]*$//;
1883
1884                                 for my $arg (split(/\s*,\s*/, $ctx)) {
1885                                         if ($arg =~ /^(?:const\s+)?($Ident)(?:\s+$Sparse)*\s*\**\s*(:?\b$Ident)?$/s || $arg =~ /^($Ident)$/s) {
1886
1887                                                 possible($1, "D:" . $s);
1888                                         }
1889                                 }
1890                         }
1891
1892                 }
1893
1894 #
1895 # Checks which may be anchored in the context.
1896 #
1897
1898 # Check for switch () and associated case and default
1899 # statements should be at the same indent.
1900                 if ($line=~/\bswitch\s*\(.*\)/) {
1901                         my $err = '';
1902                         my $sep = '';
1903                         my @ctx = ctx_block_outer($linenr, $realcnt);
1904                         shift(@ctx);
1905                         for my $ctx (@ctx) {
1906                                 my ($clen, $cindent) = line_stats($ctx);
1907                                 if ($ctx =~ /^\+\s*(case\s+|default:)/ &&
1908                                                         $indent != $cindent) {
1909                                         $err .= "$sep$ctx\n";
1910                                         $sep = '';
1911                                 } else {
1912                                         $sep = "[...]\n";
1913                                 }
1914                         }
1915                         if ($err ne '') {
1916                                 ERROR("SWITCH_CASE_INDENT_LEVEL",
1917                                       "switch and case should be at the same indent\n$hereline$err");
1918                         }
1919                 }
1920
1921 # if/while/etc brace do not go on next line, unless defining a do while loop,
1922 # or if that brace on the next line is for something else
1923                 if ($line =~ /(.*)\b((?:if|while|for|switch)\s*\(|do\b|else\b)/ && $line !~ /^.\s*\#/) {
1924                         my $pre_ctx = "$1$2";
1925
1926                         my ($level, @ctx) = ctx_statement_level($linenr, $realcnt, 0);
1927                         my $ctx_cnt = $realcnt - $#ctx - 1;
1928                         my $ctx = join("\n", @ctx);
1929
1930                         my $ctx_ln = $linenr;
1931                         my $ctx_skip = $realcnt;
1932
1933                         while ($ctx_skip > $ctx_cnt || ($ctx_skip == $ctx_cnt &&
1934                                         defined $lines[$ctx_ln - 1] &&
1935                                         $lines[$ctx_ln - 1] =~ /^-/)) {
1936                                 ##print "SKIP<$ctx_skip> CNT<$ctx_cnt>\n";
1937                                 $ctx_skip-- if (!defined $lines[$ctx_ln - 1] || $lines[$ctx_ln - 1] !~ /^-/);
1938                                 $ctx_ln++;
1939                         }
1940
1941                         #print "realcnt<$realcnt> ctx_cnt<$ctx_cnt>\n";
1942                         #print "pre<$pre_ctx>\nline<$line>\nctx<$ctx>\nnext<$lines[$ctx_ln - 1]>\n";
1943
1944                         if ($ctx !~ /{\s*/ && defined($lines[$ctx_ln -1]) && $lines[$ctx_ln - 1] =~ /^\+\s*{/) {
1945                                 ERROR("OPEN_BRACE",
1946                                       "that open brace { should be on the previous line\n" .
1947                                         "$here\n$ctx\n$rawlines[$ctx_ln - 1]\n");
1948                         }
1949                         if ($level == 0 && $pre_ctx !~ /}\s*while\s*\($/ &&
1950                             $ctx =~ /\)\s*\;\s*$/ &&
1951                             defined $lines[$ctx_ln - 1])
1952                         {
1953                                 my ($nlength, $nindent) = line_stats($lines[$ctx_ln - 1]);
1954                                 if ($nindent > $indent) {
1955                                         WARN("TRAILING_SEMICOLON",
1956                                              "trailing semicolon indicates no statements, indent implies otherwise\n" .
1957                                                 "$here\n$ctx\n$rawlines[$ctx_ln - 1]\n");
1958                                 }
1959                         }
1960                 }
1961
1962 # Check relative indent for conditionals and blocks.
1963                 if ($line =~ /\b(?:(?:if|while|for)\s*\(|do\b)/ && $line !~ /^.\s*#/ && $line !~ /\}\s*while\s*/) {
1964                         ($stat, $cond, $line_nr_next, $remain_next, $off_next) =
1965                                 ctx_statement_block($linenr, $realcnt, 0)
1966                                         if (!defined $stat);
1967                         my ($s, $c) = ($stat, $cond);
1968
1969                         substr($s, 0, length($c), '');
1970
1971                         # Make sure we remove the line prefixes as we have
1972                         # none on the first line, and are going to readd them
1973                         # where necessary.
1974                         $s =~ s/\n./\n/gs;
1975
1976                         # Find out how long the conditional actually is.
1977                         my @newlines = ($c =~ /\n/gs);
1978                         my $cond_lines = 1 + $#newlines;
1979
1980                         # We want to check the first line inside the block
1981                         # starting at the end of the conditional, so remove:
1982                         #  1) any blank line termination
1983                         #  2) any opening brace { on end of the line
1984                         #  3) any do (...) {
1985                         my $continuation = 0;
1986                         my $check = 0;
1987                         $s =~ s/^.*\bdo\b//;
1988                         $s =~ s/^\s*{//;
1989                         if ($s =~ s/^\s*\\//) {
1990                                 $continuation = 1;
1991                         }
1992                         if ($s =~ s/^\s*?\n//) {
1993                                 $check = 1;
1994                                 $cond_lines++;
1995                         }
1996
1997                         # Also ignore a loop construct at the end of a
1998                         # preprocessor statement.
1999                         if (($prevline =~ /^.\s*#\s*define\s/ ||
2000                             $prevline =~ /\\\s*$/) && $continuation == 0) {
2001                                 $check = 0;
2002                         }
2003
2004                         my $cond_ptr = -1;
2005                         $continuation = 0;
2006                         while ($cond_ptr != $cond_lines) {
2007                                 $cond_ptr = $cond_lines;
2008
2009                                 # If we see an #else/#elif then the code
2010                                 # is not linear.
2011                                 if ($s =~ /^\s*\#\s*(?:else|elif)/) {
2012                                         $check = 0;
2013                                 }
2014
2015                                 # Ignore:
2016                                 #  1) blank lines, they should be at 0,
2017                                 #  2) preprocessor lines, and
2018                                 #  3) labels.
2019                                 if ($continuation ||
2020                                     $s =~ /^\s*?\n/ ||
2021                                     $s =~ /^\s*#\s*?/ ||
2022                                     $s =~ /^\s*$Ident\s*:/) {
2023                                         $continuation = ($s =~ /^.*?\\\n/) ? 1 : 0;
2024                                         if ($s =~ s/^.*?\n//) {
2025                                                 $cond_lines++;
2026                                         }
2027                                 }
2028                         }
2029
2030                         my (undef, $sindent) = line_stats("+" . $s);
2031                         my $stat_real = raw_line($linenr, $cond_lines);
2032
2033                         # Check if either of these lines are modified, else
2034                         # this is not this patch's fault.
2035                         if (!defined($stat_real) ||
2036                             $stat !~ /^\+/ && $stat_real !~ /^\+/) {
2037                                 $check = 0;
2038                         }
2039                         if (defined($stat_real) && $cond_lines > 1) {
2040                                 $stat_real = "[...]\n$stat_real";
2041                         }
2042
2043                         #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";
2044
2045                         if ($check && (($sindent % 8) != 0 ||
2046                             ($sindent <= $indent && $s ne ''))) {
2047                                 WARN("SUSPECT_CODE_INDENT",
2048                                      "suspect code indent for conditional statements ($indent, $sindent)\n" . $herecurr . "$stat_real\n");
2049                         }
2050                 }
2051
2052                 # Track the 'values' across context and added lines.
2053                 my $opline = $line; $opline =~ s/^./ /;
2054                 my ($curr_values, $curr_vars) =
2055                                 annotate_values($opline . "\n", $prev_values);
2056                 $curr_values = $prev_values . $curr_values;
2057                 if ($dbg_values) {
2058                         my $outline = $opline; $outline =~ s/\t/ /g;
2059                         print "$linenr > .$outline\n";
2060                         print "$linenr > $curr_values\n";
2061                         print "$linenr >  $curr_vars\n";
2062                 }
2063                 $prev_values = substr($curr_values, -1);
2064
2065 #ignore lines not being added
2066                 if ($line=~/^[^\+]/) {next;}
2067
2068 # TEST: allow direct testing of the type matcher.
2069                 if ($dbg_type) {
2070                         if ($line =~ /^.\s*$Declare\s*$/) {
2071                                 ERROR("TEST_TYPE",
2072                                       "TEST: is type\n" . $herecurr);
2073                         } elsif ($dbg_type > 1 && $line =~ /^.+($Declare)/) {
2074                                 ERROR("TEST_NOT_TYPE",
2075                                       "TEST: is not type ($1 is)\n". $herecurr);
2076                         }
2077                         next;
2078                 }
2079 # TEST: allow direct testing of the attribute matcher.
2080                 if ($dbg_attr) {
2081                         if ($line =~ /^.\s*$Modifier\s*$/) {
2082                                 ERROR("TEST_ATTR",
2083                                       "TEST: is attr\n" . $herecurr);
2084                         } elsif ($dbg_attr > 1 && $line =~ /^.+($Modifier)/) {
2085                                 ERROR("TEST_NOT_ATTR",
2086                                       "TEST: is not attr ($1 is)\n". $herecurr);
2087                         }
2088                         next;
2089                 }
2090
2091 # check for initialisation to aggregates open brace on the next line
2092                 if ($line =~ /^.\s*{/ &&
2093                     $prevline =~ /(?:^|[^=])=\s*$/) {
2094                         ERROR("OPEN_BRACE",
2095                               "that open brace { should be on the previous line\n" . $hereprev);
2096                 }
2097
2098 #
2099 # Checks which are anchored on the added line.
2100 #
2101
2102 # check for malformed paths in #include statements (uses RAW line)
2103                 if ($rawline =~ m{^.\s*\#\s*include\s+[<"](.*)[">]}) {
2104                         my $path = $1;
2105                         if ($path =~ m{//}) {
2106                                 ERROR("MALFORMED_INCLUDE",
2107                                       "malformed #include filename\n" .
2108                                         $herecurr);
2109                         }
2110                 }
2111
2112 # no C99 // comments
2113                 if ($line =~ m{//}) {
2114                         ERROR("C99_COMMENTS",
2115                               "do not use C99 // comments\n" . $herecurr);
2116                 }
2117                 # Remove C99 comments.
2118                 $line =~ s@//.*@@;
2119                 $opline =~ s@//.*@@;
2120
2121 # EXPORT_SYMBOL should immediately follow the thing it is exporting, consider
2122 # the whole statement.
2123 #print "APW <$lines[$realline_next - 1]>\n";
2124                 if (defined $realline_next &&
2125                     exists $lines[$realline_next - 1] &&
2126                     !defined $suppress_export{$realline_next} &&
2127                     ($lines[$realline_next - 1] =~ /EXPORT_SYMBOL.*\((.*)\)/ ||
2128                      $lines[$realline_next - 1] =~ /EXPORT_UNUSED_SYMBOL.*\((.*)\)/)) {
2129                         # Handle definitions which produce identifiers with
2130                         # a prefix:
2131                         #   XXX(foo);
2132                         #   EXPORT_SYMBOL(something_foo);
2133                         my $name = $1;
2134                         if ($stat =~ /^(?:.\s*}\s*\n)?.([A-Z_]+)\s*\(\s*($Ident)/ &&
2135                             $name =~ /^${Ident}_$2/) {
2136 #print "FOO C name<$name>\n";
2137                                 $suppress_export{$realline_next} = 1;
2138
2139                         } elsif ($stat !~ /(?:
2140                                 \n.}\s*$|
2141                                 ^.DEFINE_$Ident\(\Q$name\E\)|
2142                                 ^.DECLARE_$Ident\(\Q$name\E\)|
2143                                 ^.LIST_HEAD\(\Q$name\E\)|
2144                                 ^.(?:$Storage\s+)?$Type\s*\(\s*\*\s*\Q$name\E\s*\)\s*\(|
2145                                 \b\Q$name\E(?:\s+$Attribute)*\s*(?:;|=|\[|\()
2146                             )/x) {
2147 #print "FOO A<$lines[$realline_next - 1]> stat<$stat> name<$name>\n";
2148                                 $suppress_export{$realline_next} = 2;
2149                         } else {
2150                                 $suppress_export{$realline_next} = 1;
2151                         }
2152                 }
2153                 if (!defined $suppress_export{$linenr} &&
2154                     $prevline =~ /^.\s*$/ &&
2155                     ($line =~ /EXPORT_SYMBOL.*\((.*)\)/ ||
2156                      $line =~ /EXPORT_UNUSED_SYMBOL.*\((.*)\)/)) {
2157 #print "FOO B <$lines[$linenr - 1]>\n";
2158                         $suppress_export{$linenr} = 2;
2159                 }
2160                 if (defined $suppress_export{$linenr} &&
2161                     $suppress_export{$linenr} == 2) {
2162                         WARN("EXPORT_SYMBOL",
2163                              "EXPORT_SYMBOL(foo); should immediately follow its function/variable\n" . $herecurr);
2164                 }
2165
2166 # check for global initialisers.
2167                 if ($line =~ /^.$Type\s*$Ident\s*(?:\s+$Modifier)*\s*=\s*(0|NULL|false)\s*;/) {
2168                         ERROR("GLOBAL_INITIALISERS",
2169                               "do not initialise globals to 0 or NULL\n" .
2170                                 $herecurr);
2171                 }
2172 # check for static initialisers.
2173                 if ($line =~ /\bstatic\s.*=\s*(0|NULL|false)\s*;/) {
2174                         ERROR("INITIALISED_STATIC",
2175                               "do not initialise statics to 0 or NULL\n" .
2176                                 $herecurr);
2177                 }
2178
2179 # check for static const char * arrays.
2180                 if ($line =~ /\bstatic\s+const\s+char\s*\*\s*(\w+)\s*\[\s*\]\s*=\s*/) {
2181                         WARN("STATIC_CONST_CHAR_ARRAY",
2182                              "static const char * array should probably be static const char * const\n" .
2183                                 $herecurr);
2184                }
2185
2186 # check for static char foo[] = "bar" declarations.
2187                 if ($line =~ /\bstatic\s+char\s+(\w+)\s*\[\s*\]\s*=\s*"/) {
2188                         WARN("STATIC_CONST_CHAR_ARRAY",
2189                              "static char array declaration should probably be static const char\n" .
2190                                 $herecurr);
2191                }
2192
2193 # check for declarations of struct pci_device_id
2194                 if ($line =~ /\bstruct\s+pci_device_id\s+\w+\s*\[\s*\]\s*\=\s*\{/) {
2195                         WARN("DEFINE_PCI_DEVICE_TABLE",
2196                              "Use DEFINE_PCI_DEVICE_TABLE for struct pci_device_id\n" . $herecurr);
2197                 }
2198
2199 # check for new typedefs, only function parameters and sparse annotations
2200 # make sense.
2201                 if ($line =~ /\btypedef\s/ &&
2202                     $line !~ /\btypedef\s+$Type\s*\(\s*\*?$Ident\s*\)\s*\(/ &&
2203                     $line !~ /\btypedef\s+$Type\s+$Ident\s*\(/ &&
2204                     $line !~ /\b$typeTypedefs\b/ &&
2205                     $line !~ /\b__bitwise(?:__|)\b/) {
2206                         WARN("NEW_TYPEDEFS",
2207                              "do not add new typedefs\n" . $herecurr);
2208                 }
2209
2210 # * goes on variable not on type
2211                 # (char*[ const])
2212                 if ($line =~ m{\($NonptrType(\s*(?:$Modifier\b\s*|\*\s*)+)\)}) {
2213                         my ($from, $to) = ($1, $1);
2214
2215                         # Should start with a space.
2216                         $to =~ s/^(\S)/ $1/;
2217                         # Should not end with a space.
2218                         $to =~ s/\s+$//;
2219                         # '*'s should not have spaces between.
2220                         while ($to =~ s/\*\s+\*/\*\*/) {
2221                         }
2222
2223                         #print "from<$from> to<$to>\n";
2224                         if ($from ne $to) {
2225                                 ERROR("POINTER_LOCATION",
2226                                       "\"(foo$from)\" should be \"(foo$to)\"\n" .  $herecurr);
2227                         }
2228                 } elsif ($line =~ m{\b$NonptrType(\s*(?:$Modifier\b\s*|\*\s*)+)($Ident)}) {
2229                         my ($from, $to, $ident) = ($1, $1, $2);
2230
2231                         # Should start with a space.
2232                         $to =~ s/^(\S)/ $1/;
2233                         # Should not end with a space.
2234                         $to =~ s/\s+$//;
2235                         # '*'s should not have spaces between.
2236                         while ($to =~ s/\*\s+\*/\*\*/) {
2237                         }
2238                         # Modifiers should have spaces.
2239                         $to =~ s/(\b$Modifier$)/$1 /;
2240
2241                         #print "from<$from> to<$to> ident<$ident>\n";
2242                         if ($from ne $to && $ident !~ /^$Modifier$/) {
2243                                 ERROR("POINTER_LOCATION",
2244                                       "\"foo${from}bar\" should be \"foo${to}bar\"\n" .  $herecurr);
2245                         }
2246                 }
2247
2248 # # no BUG() or BUG_ON()
2249 #               if ($line =~ /\b(BUG|BUG_ON)\b/) {
2250 #                       print "Try to use WARN_ON & Recovery code rather than BUG() or BUG_ON()\n";
2251 #                       print "$herecurr";
2252 #                       $clean = 0;
2253 #               }
2254
2255                 if ($line =~ /\bLINUX_VERSION_CODE\b/) {
2256                         WARN("LINUX_VERSION_CODE",
2257                              "LINUX_VERSION_CODE should be avoided, code should be for the version to which it is merged\n" . $herecurr);
2258                 }
2259
2260 # check for uses of printk_ratelimit
2261                 if ($line =~ /\bprintk_ratelimit\s*\(/) {
2262                         WARN("PRINTK_RATELIMITED",
2263 "Prefer printk_ratelimited or pr_<level>_ratelimited to printk_ratelimit\n" . $herecurr);
2264                 }
2265
2266 # printk should use KERN_* levels.  Note that follow on printk's on the
2267 # same line do not need a level, so we use the current block context
2268 # to try and find and validate the current printk.  In summary the current
2269 # printk includes all preceding printk's which have no newline on the end.
2270 # we assume the first bad printk is the one to report.
2271                 if ($line =~ /\bprintk\((?!KERN_)\s*"/) {
2272                         my $ok = 0;
2273                         for (my $ln = $linenr - 1; $ln >= $first_line; $ln--) {
2274                                 #print "CHECK<$lines[$ln - 1]\n";
2275                                 # we have a preceding printk if it ends
2276                                 # with "\n" ignore it, else it is to blame
2277                                 if ($lines[$ln - 1] =~ m{\bprintk\(}) {
2278                                         if ($rawlines[$ln - 1] !~ m{\\n"}) {
2279                                                 $ok = 1;
2280                                         }
2281                                         last;
2282                                 }
2283                         }
2284                         if ($ok == 0) {
2285                                 WARN("PRINTK_WITHOUT_KERN_LEVEL",
2286                                      "printk() should include KERN_ facility level\n" . $herecurr);
2287                         }
2288                 }
2289
2290 # function brace can't be on same line, except for #defines of do while,
2291 # or if closed on same line
2292                 if (($line=~/$Type\s*$Ident\(.*\).*\s{/) and
2293                     !($line=~/\#\s*define.*do\s{/) and !($line=~/}/)) {
2294                         ERROR("OPEN_BRACE",
2295                               "open brace '{' following function declarations go on the next line\n" . $herecurr);
2296                 }
2297
2298 # open braces for enum, union and struct go on the same line.
2299                 if ($line =~ /^.\s*{/ &&
2300                     $prevline =~ /^.\s*(?:typedef\s+)?(enum|union|struct)(?:\s+$Ident)?\s*$/) {
2301                         ERROR("OPEN_BRACE",
2302                               "open brace '{' following $1 go on the same line\n" . $hereprev);
2303                 }
2304
2305 # missing space after union, struct or enum definition
2306                 if ($line =~ /^.\s*(?:typedef\s+)?(enum|union|struct)(?:\s+$Ident)?(?:\s+$Ident)?[=\{]/) {
2307                     WARN("SPACING",
2308                          "missing space after $1 definition\n" . $herecurr);
2309                 }
2310
2311 # check for spacing round square brackets; allowed:
2312 #  1. with a type on the left -- int [] a;
2313 #  2. at the beginning of a line for slice initialisers -- [0...10] = 5,
2314 #  3. inside a curly brace -- = { [0...10] = 5 }
2315                 while ($line =~ /(.*?\s)\[/g) {
2316                         my ($where, $prefix) = ($-[1], $1);
2317                         if ($prefix !~ /$Type\s+$/ &&
2318                             ($where != 0 || $prefix !~ /^.\s+$/) &&
2319                             $prefix !~ /{\s+$/) {
2320                                 ERROR("BRACKET_SPACE",
2321                                       "space prohibited before open square bracket '['\n" . $herecurr);
2322                         }
2323                 }
2324
2325 # check for spaces between functions and their parentheses.
2326                 while ($line =~ /($Ident)\s+\(/g) {
2327                         my $name = $1;
2328                         my $ctx_before = substr($line, 0, $-[1]);
2329                         my $ctx = "$ctx_before$name";
2330
2331                         # Ignore those directives where spaces _are_ permitted.
2332                         if ($name =~ /^(?:
2333                                 if|for|while|switch|return|case|
2334                                 volatile|__volatile__|
2335                                 __attribute__|format|__extension__|
2336                                 asm|__asm__)$/x)
2337                         {
2338
2339                         # cpp #define statements have non-optional spaces, ie
2340                         # if there is a space between the name and the open
2341                         # parenthesis it is simply not a parameter group.
2342                         } elsif ($ctx_before =~ /^.\s*\#\s*define\s*$/) {
2343
2344                         # cpp #elif statement condition may start with a (
2345                         } elsif ($ctx =~ /^.\s*\#\s*elif\s*$/) {
2346
2347                         # If this whole things ends with a type its most
2348                         # likely a typedef for a function.
2349                         } elsif ($ctx =~ /$Type$/) {
2350
2351                         } else {
2352                                 WARN("SPACING",
2353                                      "space prohibited between function name and open parenthesis '('\n" . $herecurr);
2354                         }
2355                 }
2356 # Check operator spacing.
2357                 if (!($line=~/\#\s*include/)) {
2358                         my $ops = qr{
2359                                 <<=|>>=|<=|>=|==|!=|
2360                                 \+=|-=|\*=|\/=|%=|\^=|\|=|&=|
2361                                 =>|->|<<|>>|<|>|=|!|~|
2362                                 &&|\|\||,|\^|\+\+|--|&|\||\+|-|\*|\/|%|
2363                                 \?|:
2364                         }x;
2365                         my @elements = split(/($ops|;)/, $opline);
2366                         my $off = 0;
2367
2368                         my $blank = copy_spacing($opline);
2369
2370                         for (my $n = 0; $n < $#elements; $n += 2) {
2371                                 $off += length($elements[$n]);
2372
2373                                 # Pick up the preceding and succeeding characters.
2374                                 my $ca = substr($opline, 0, $off);
2375                                 my $cc = '';
2376                                 if (length($opline) >= ($off + length($elements[$n + 1]))) {
2377                                         $cc = substr($opline, $off + length($elements[$n + 1]));
2378                                 }
2379                                 my $cb = "$ca$;$cc";
2380
2381                                 my $a = '';
2382                                 $a = 'V' if ($elements[$n] ne '');
2383                                 $a = 'W' if ($elements[$n] =~ /\s$/);
2384                                 $a = 'C' if ($elements[$n] =~ /$;$/);
2385                                 $a = 'B' if ($elements[$n] =~ /(\[|\()$/);
2386                                 $a = 'O' if ($elements[$n] eq '');
2387                                 $a = 'E' if ($ca =~ /^\s*$/);
2388
2389                                 my $op = $elements[$n + 1];
2390
2391                                 my $c = '';
2392                                 if (defined $elements[$n + 2]) {
2393                                         $c = 'V' if ($elements[$n + 2] ne '');
2394                                         $c = 'W' if ($elements[$n + 2] =~ /^\s/);
2395                                         $c = 'C' if ($elements[$n + 2] =~ /^$;/);
2396                                         $c = 'B' if ($elements[$n + 2] =~ /^(\)|\]|;)/);
2397                                         $c = 'O' if ($elements[$n + 2] eq '');
2398                                         $c = 'E' if ($elements[$n + 2] =~ /^\s*\\$/);
2399                                 } else {
2400                                         $c = 'E';
2401                                 }
2402
2403                                 my $ctx = "${a}x${c}";
2404
2405                                 my $at = "(ctx:$ctx)";
2406
2407                                 my $ptr = substr($blank, 0, $off) . "^";
2408                                 my $hereptr = "$hereline$ptr\n";
2409
2410                                 # Pull out the value of this operator.
2411                                 my $op_type = substr($curr_values, $off + 1, 1);
2412
2413                                 # Get the full operator variant.
2414                                 my $opv = $op . substr($curr_vars, $off, 1);
2415
2416                                 # Ignore operators passed as parameters.
2417                                 if ($op_type ne 'V' &&
2418                                     $ca =~ /\s$/ && $cc =~ /^\s*,/) {
2419
2420 #                               # Ignore comments
2421 #                               } elsif ($op =~ /^$;+$/) {
2422
2423                                 # ; should have either the end of line or a space or \ after it
2424                                 } elsif ($op eq ';') {
2425                                         if ($ctx !~ /.x[WEBC]/ &&
2426                                             $cc !~ /^\\/ && $cc !~ /^;/) {
2427                                                 ERROR("SPACING",
2428                                                       "space required after that '$op' $at\n" . $hereptr);
2429                                         }
2430
2431                                 # // is a comment
2432                                 } elsif ($op eq '//') {
2433
2434                                 # No spaces for:
2435                                 #   ->
2436                                 #   :   when part of a bitfield
2437                                 } elsif ($op eq '->' || $opv eq ':B') {
2438                                         if ($ctx =~ /Wx.|.xW/) {
2439                                                 ERROR("SPACING",
2440                                                       "spaces prohibited around that '$op' $at\n" . $hereptr);
2441                                         }
2442
2443                                 # , must have a space on the right.
2444                                 } elsif ($op eq ',') {
2445                                         if ($ctx !~ /.x[WEC]/ && $cc !~ /^}/) {
2446                                                 ERROR("SPACING",
2447                                                       "space required after that '$op' $at\n" . $hereptr);
2448                                         }
2449
2450                                 # '*' as part of a type definition -- reported already.
2451                                 } elsif ($opv eq '*_') {
2452                                         #warn "'*' is part of type\n";
2453
2454                                 # unary operators should have a space before and
2455                                 # none after.  May be left adjacent to another
2456                                 # unary operator, or a cast
2457                                 } elsif ($op eq '!' || $op eq '~' ||
2458                                          $opv eq '*U' || $opv eq '-U' ||
2459                                          $opv eq '&U' || $opv eq '&&U') {
2460                                         if ($ctx !~ /[WEBC]x./ && $ca !~ /(?:\)|!|~|\*|-|\&|\||\+\+|\-\-|\{)$/) {
2461                                                 ERROR("SPACING",
2462                                                       "space required before that '$op' $at\n" . $hereptr);
2463                                         }
2464                                         if ($op eq '*' && $cc =~/\s*$Modifier\b/) {
2465                                                 # A unary '*' may be const
2466
2467                                         } elsif ($ctx =~ /.xW/) {
2468                                                 ERROR("SPACING",
2469                                                       "space prohibited after that '$op' $at\n" . $hereptr);
2470                                         }
2471
2472                                 # unary ++ and unary -- are allowed no space on one side.
2473                                 } elsif ($op eq '++' or $op eq '--') {
2474                                         if ($ctx !~ /[WEOBC]x[^W]/ && $ctx !~ /[^W]x[WOBEC]/) {
2475                                                 ERROR("SPACING",
2476                                                       "space required one side of that '$op' $at\n" . $hereptr);
2477                                         }
2478                                         if ($ctx =~ /Wx[BE]/ ||
2479                                             ($ctx =~ /Wx./ && $cc =~ /^;/)) {
2480                                                 ERROR("SPACING",
2481                                                       "space prohibited before that '$op' $at\n" . $hereptr);
2482                                         }
2483                                         if ($ctx =~ /ExW/) {
2484                                                 ERROR("SPACING",
2485                                                       "space prohibited after that '$op' $at\n" . $hereptr);
2486                                         }
2487
2488
2489                                 # << and >> may either have or not have spaces both sides
2490                                 } elsif ($op eq '<<' or $op eq '>>' or
2491                                          $op eq '&' or $op eq '^' or $op eq '|' or
2492                                          $op eq '+' or $op eq '-' or
2493                                          $op eq '*' or $op eq '/' or
2494                                          $op eq '%')
2495                                 {
2496                                         if ($ctx =~ /Wx[^WCE]|[^WCE]xW/) {
2497                                                 ERROR("SPACING",
2498                                                       "need consistent spacing around '$op' $at\n" .
2499                                                         $hereptr);
2500                                         }
2501
2502                                 # A colon needs no spaces before when it is
2503                                 # terminating a case value or a label.
2504                                 } elsif ($opv eq ':C' || $opv eq ':L') {
2505                                         if ($ctx =~ /Wx./) {
2506                                                 ERROR("SPACING",
2507                                                       "space prohibited before that '$op' $at\n" . $hereptr);
2508                                         }
2509
2510                                 # All the others need spaces both sides.
2511                                 } elsif ($ctx !~ /[EWC]x[CWE]/) {
2512                                         my $ok = 0;
2513
2514                                         # Ignore email addresses <foo@bar>
2515                                         if (($op eq '<' &&
2516                                              $cc =~ /^\S+\@\S+>/) ||
2517                                             ($op eq '>' &&
2518                                              $ca =~ /<\S+\@\S+$/))
2519                                         {
2520                                                 $ok = 1;
2521                                         }
2522
2523                                         # Ignore ?:
2524                                         if (($opv eq ':O' && $ca =~ /\?$/) ||
2525                                             ($op eq '?' && $cc =~ /^:/)) {
2526                                                 $ok = 1;
2527                                         }
2528
2529                                         if ($ok == 0) {
2530                                                 ERROR("SPACING",
2531                                                       "spaces required around that '$op' $at\n" . $hereptr);
2532                                         }
2533                                 }
2534                                 $off += length($elements[$n + 1]);
2535                         }
2536                 }
2537
2538 # check for multiple assignments
2539                 if ($line =~ /^.\s*$Lval\s*=\s*$Lval\s*=(?!=)/) {
2540                         CHK("MULTIPLE_ASSIGNMENTS",
2541                             "multiple assignments should be avoided\n" . $herecurr);
2542                 }
2543
2544 ## # check for multiple declarations, allowing for a function declaration
2545 ## # continuation.
2546 ##              if ($line =~ /^.\s*$Type\s+$Ident(?:\s*=[^,{]*)?\s*,\s*$Ident.*/ &&
2547 ##                  $line !~ /^.\s*$Type\s+$Ident(?:\s*=[^,{]*)?\s*,\s*$Type\s*$Ident.*/) {
2548 ##
2549 ##                      # Remove any bracketed sections to ensure we do not
2550 ##                      # falsly report the parameters of functions.
2551 ##                      my $ln = $line;
2552 ##                      while ($ln =~ s/\([^\(\)]*\)//g) {
2553 ##                      }
2554 ##                      if ($ln =~ /,/) {
2555 ##                              WARN("MULTIPLE_DECLARATION",
2556 ##                                   "declaring multiple variables together should be avoided\n" . $herecurr);
2557 ##                      }
2558 ##              }
2559
2560 #need space before brace following if, while, etc
2561                 if (($line =~ /\(.*\){/ && $line !~ /\($Type\){/) ||
2562                     $line =~ /do{/) {
2563                         ERROR("SPACING",
2564                               "space required before the open brace '{'\n" . $herecurr);
2565                 }
2566
2567 # closing brace should have a space following it when it has anything
2568 # on the line
2569                 if ($line =~ /}(?!(?:,|;|\)))\S/) {
2570                         ERROR("SPACING",
2571                               "space required after that close brace '}'\n" . $herecurr);
2572                 }
2573
2574 # check spacing on square brackets
2575                 if ($line =~ /\[\s/ && $line !~ /\[\s*$/) {
2576                         ERROR("SPACING",
2577                               "space prohibited after that open square bracket '['\n" . $herecurr);
2578                 }
2579                 if ($line =~ /\s\]/) {
2580                         ERROR("SPACING",
2581                               "space prohibited before that close square bracket ']'\n" . $herecurr);
2582                 }
2583
2584 # check spacing on parentheses
2585                 if ($line =~ /\(\s/ && $line !~ /\(\s*(?:\\)?$/ &&
2586                     $line !~ /for\s*\(\s+;/) {
2587                         ERROR("SPACING",
2588                               "space prohibited after that open parenthesis '('\n" . $herecurr);
2589                 }
2590                 if ($line =~ /(\s+)\)/ && $line !~ /^.\s*\)/ &&
2591                     $line !~ /for\s*\(.*;\s+\)/ &&
2592                     $line !~ /:\s+\)/) {
2593                         ERROR("SPACING",
2594                               "space prohibited before that close parenthesis ')'\n" . $herecurr);
2595                 }
2596
2597 #goto labels aren't indented, allow a single space however
2598                 if ($line=~/^.\s+[A-Za-z\d_]+:(?![0-9]+)/ and
2599                    !($line=~/^. [A-Za-z\d_]+:/) and !($line=~/^.\s+default:/)) {
2600                         WARN("INDENTED_LABEL",
2601                              "labels should not be indented\n" . $herecurr);
2602                 }
2603
2604 # Return is not a function.
2605                 if (defined($stat) && $stat =~ /^.\s*return(\s*)(\(.*);/s) {
2606                         my $spacing = $1;
2607                         my $value = $2;
2608
2609                         # Flatten any parentheses
2610                         $value =~ s/\(/ \(/g;
2611                         $value =~ s/\)/\) /g;
2612                         while ($value =~ s/\[[^\[\]]*\]/1/ ||
2613                                $value !~ /(?:$Ident|-?$Constant)\s*
2614                                              $Compare\s*
2615                                              (?:$Ident|-?$Constant)/x &&
2616                                $value =~ s/\([^\(\)]*\)/1/) {
2617                         }
2618 #print "value<$value>\n";
2619                         if ($value =~ /^\s*(?:$Ident|-?$Constant)\s*$/) {
2620                                 ERROR("RETURN_PARENTHESES",
2621                                       "return is not a function, parentheses are not required\n" . $herecurr);
2622
2623                         } elsif ($spacing !~ /\s+/) {
2624                                 ERROR("SPACING",
2625                                       "space required before the open parenthesis '('\n" . $herecurr);
2626                         }
2627                 }
2628 # Return of what appears to be an errno should normally be -'ve
2629                 if ($line =~ /^.\s*return\s*(E[A-Z]*)\s*;/) {
2630                         my $name = $1;
2631                         if ($name ne 'EOF' && $name ne 'ERROR') {
2632                                 WARN("USE_NEGATIVE_ERRNO",
2633                                      "return of an errno should typically be -ve (return -$1)\n" . $herecurr);
2634                         }
2635                 }
2636
2637 # Need a space before open parenthesis after if, while etc
2638                 if ($line=~/\b(if|while|for|switch)\(/) {
2639                         ERROR("SPACING", "space required before the open parenthesis '('\n" . $herecurr);
2640                 }
2641
2642 # Check for illegal assignment in if conditional -- and check for trailing
2643 # statements after the conditional.
2644                 if ($line =~ /do\s*(?!{)/) {
2645                         ($stat, $cond, $line_nr_next, $remain_next, $off_next) =
2646                                 ctx_statement_block($linenr, $realcnt, 0)
2647                                         if (!defined $stat);
2648                         my ($stat_next) = ctx_statement_block($line_nr_next,
2649                                                 $remain_next, $off_next);
2650                         $stat_next =~ s/\n./\n /g;
2651                         ##print "stat<$stat> stat_next<$stat_next>\n";
2652
2653                         if ($stat_next =~ /^\s*while\b/) {
2654                                 # If the statement carries leading newlines,
2655                                 # then count those as offsets.
2656                                 my ($whitespace) =
2657                                         ($stat_next =~ /^((?:\s*\n[+-])*\s*)/s);
2658                                 my $offset =
2659                                         statement_rawlines($whitespace) - 1;
2660
2661                                 $suppress_whiletrailers{$line_nr_next +
2662                                                                 $offset} = 1;
2663                         }
2664                 }
2665                 if (!defined $suppress_whiletrailers{$linenr} &&
2666                     $line =~ /\b(?:if|while|for)\s*\(/ && $line !~ /^.\s*#/) {
2667                         my ($s, $c) = ($stat, $cond);
2668
2669                         if ($c =~ /\bif\s*\(.*[^<>!=]=[^=].*/s) {
2670                                 ERROR("ASSIGN_IN_IF",
2671                                       "do not use assignment in if condition\n" . $herecurr);
2672                         }
2673
2674                         # Find out what is on the end of the line after the
2675                         # conditional.
2676                         substr($s, 0, length($c), '');
2677                         $s =~ s/\n.*//g;
2678                         $s =~ s/$;//g;  # Remove any comments
2679                         if (length($c) && $s !~ /^\s*{?\s*\\*\s*$/ &&
2680                             $c !~ /}\s*while\s*/)
2681                         {
2682                                 # Find out how long the conditional actually is.
2683                                 my @newlines = ($c =~ /\n/gs);
2684                                 my $cond_lines = 1 + $#newlines;
2685                                 my $stat_real = '';
2686
2687                                 $stat_real = raw_line($linenr, $cond_lines)
2688                                                         . "\n" if ($cond_lines);
2689                                 if (defined($stat_real) && $cond_lines > 1) {
2690                                         $stat_real = "[...]\n$stat_real";
2691                                 }
2692
2693                                 ERROR("TRAILING_STATEMENTS",
2694                                       "trailing statements should be on next line\n" . $herecurr . $stat_real);
2695                         }
2696                 }
2697
2698 # Check for bitwise tests written as boolean
2699                 if ($line =~ /
2700                         (?:
2701                                 (?:\[|\(|\&\&|\|\|)
2702                                 \s*0[xX][0-9]+\s*
2703                                 (?:\&\&|\|\|)
2704                         |
2705                                 (?:\&\&|\|\|)
2706                                 \s*0[xX][0-9]+\s*
2707                                 (?:\&\&|\|\||\)|\])
2708                         )/x)
2709                 {
2710                         WARN("HEXADECIMAL_BOOLEAN_TEST",
2711                              "boolean test with hexadecimal, perhaps just 1 \& or \|?\n" . $herecurr);
2712                 }
2713
2714 # if and else should not have general statements after it
2715                 if ($line =~ /^.\s*(?:}\s*)?else\b(.*)/) {
2716                         my $s = $1;
2717                         $s =~ s/$;//g;  # Remove any comments
2718                         if ($s !~ /^\s*(?:\sif|(?:{|)\s*\\?\s*$)/) {
2719                                 ERROR("TRAILING_STATEMENTS",
2720                                       "trailing statements should be on next line\n" . $herecurr);
2721                         }
2722                 }
2723 # if should not continue a brace
2724                 if ($line =~ /}\s*if\b/) {
2725                         ERROR("TRAILING_STATEMENTS",
2726                               "trailing statements should be on next line\n" .
2727                                 $herecurr);
2728                 }
2729 # case and default should not have general statements after them
2730                 if ($line =~ /^.\s*(?:case\s*.*|default\s*):/g &&
2731                     $line !~ /\G(?:
2732                         (?:\s*$;*)(?:\s*{)?(?:\s*$;*)(?:\s*\\)?\s*$|
2733                         \s*return\s+
2734                     )/xg)
2735                 {
2736                         ERROR("TRAILING_STATEMENTS",
2737                               "trailing statements should be on next line\n" . $herecurr);
2738                 }
2739
2740                 # Check for }<nl>else {, these must be at the same
2741                 # indent level to be relevant to each other.
2742                 if ($prevline=~/}\s*$/ and $line=~/^.\s*else\s*/ and
2743                                                 $previndent == $indent) {
2744                         ERROR("ELSE_AFTER_BRACE",
2745                               "else should follow close brace '}'\n" . $hereprev);
2746                 }
2747
2748                 if ($prevline=~/}\s*$/ and $line=~/^.\s*while\s*/ and
2749                                                 $previndent == $indent) {
2750                         my ($s, $c) = ctx_statement_block($linenr, $realcnt, 0);
2751
2752                         # Find out what is on the end of the line after the
2753                         # conditional.
2754                         substr($s, 0, length($c), '');
2755                         $s =~ s/\n.*//g;
2756
2757                         if ($s =~ /^\s*;/) {
2758                                 ERROR("WHILE_AFTER_BRACE",
2759                                       "while should follow close brace '}'\n" . $hereprev);
2760                         }
2761                 }
2762
2763 #studly caps, commented out until figure out how to distinguish between use of existing and adding new
2764 #               if (($line=~/[\w_][a-z\d]+[A-Z]/) and !($line=~/print/)) {
2765 #                   print "No studly caps, use _\n";
2766 #                   print "$herecurr";
2767 #                   $clean = 0;
2768 #               }
2769
2770 #no spaces allowed after \ in define
2771                 if ($line=~/\#\s*define.*\\\s$/) {
2772                         WARN("WHITESPACE_AFTER_LINE_CONTINUATION",
2773                              "Whitepspace after \\ makes next lines useless\n" . $herecurr);
2774                 }
2775
2776 #warn if <asm/foo.h> is #included and <linux/foo.h> is available (uses RAW line)
2777                 if ($tree && $rawline =~ m{^.\s*\#\s*include\s*\<asm\/(.*)\.h\>}) {
2778                         my $file = "$1.h";
2779                         my $checkfile = "include/linux/$file";
2780                         if (-f "$root/$checkfile" &&
2781                             $realfile ne $checkfile &&
2782                             $1 !~ /$allowed_asm_includes/)
2783                         {
2784                                 if ($realfile =~ m{^arch/}) {
2785                                         CHK("ARCH_INCLUDE_LINUX",
2786                                             "Consider using #include <linux/$file> instead of <asm/$file>\n" . $herecurr);
2787                                 } else {
2788                                         WARN("INCLUDE_LINUX",
2789                                              "Use #include <linux/$file> instead of <asm/$file>\n" . $herecurr);
2790                                 }
2791                         }
2792                 }
2793
2794 # multi-statement macros should be enclosed in a do while loop, grab the
2795 # first statement and ensure its the whole macro if its not enclosed
2796 # in a known good container
2797                 if ($realfile !~ m@/vmlinux.lds.h$@ &&
2798                     $line =~ /^.\s*\#\s*define\s*$Ident(\()?/) {
2799                         my $ln = $linenr;
2800                         my $cnt = $realcnt;
2801                         my ($off, $dstat, $dcond, $rest);
2802                         my $ctx = '';
2803                         ($dstat, $dcond, $ln, $cnt, $off) =
2804                                 ctx_statement_block($linenr, $realcnt, 0);
2805                         $ctx = $dstat;
2806                         #print "dstat<$dstat> dcond<$dcond> cnt<$cnt> off<$off>\n";
2807                         #print "LINE<$lines[$ln-1]> len<" . length($lines[$ln-1]) . "\n";
2808
2809                         $dstat =~ s/^.\s*\#\s*define\s+$Ident(?:\([^\)]*\))?\s*//;
2810                         $dstat =~ s/$;//g;
2811                         $dstat =~ s/\\\n.//g;
2812                         $dstat =~ s/^\s*//s;
2813                         $dstat =~ s/\s*$//s;
2814
2815                         # Flatten any parentheses and braces
2816                         while ($dstat =~ s/\([^\(\)]*\)/1/ ||
2817                                $dstat =~ s/\{[^\{\}]*\}/1/ ||
2818                                $dstat =~ s/\[[^\{\}]*\]/1/)
2819                         {
2820                         }
2821
2822                         my $exceptions = qr{
2823                                 $Declare|
2824                                 module_param_named|
2825                                 MODULE_PARAM_DESC|
2826                                 DECLARE_PER_CPU|
2827                                 DEFINE_PER_CPU|
2828                                 __typeof__\(|
2829                                 union|
2830                                 struct|
2831                                 \.$Ident\s*=\s*|
2832                                 ^\"|\"$
2833                         }x;
2834                         #print "REST<$rest> dstat<$dstat> ctx<$ctx>\n";
2835                         if ($dstat ne '' &&
2836                             $dstat !~ /^(?:$Ident|-?$Constant),$/ &&                    # 10, // foo(),
2837                             $dstat !~ /^(?:$Ident|-?$Constant);$/ &&                    # foo();
2838                             $dstat !~ /^(?:$Ident|-?$Constant)$/ &&                     # 10 // foo()
2839                             $dstat !~ /$exceptions/ &&
2840                             $dstat !~ /^\.$Ident\s*=/ &&                                # .foo =
2841                             $dstat !~ /^do\s*$Constant\s*while\s*$Constant;?$/ &&       # do {...} while (...); // do {...} while (...)
2842                             $dstat !~ /^for\s*$Constant$/ &&                            # for (...)
2843                             $dstat !~ /^for\s*$Constant\s+(?:$Ident|-?$Constant)$/ &&   # for (...) bar()
2844                             $dstat !~ /^do\s*{/ &&                                      # do {...
2845                             $dstat !~ /^\({/)                                           # ({...
2846                         {
2847                                 $ctx =~ s/\n*$//;
2848                                 my $herectx = $here . "\n";
2849                                 my $cnt = statement_rawlines($ctx);
2850
2851                                 for (my $n = 0; $n < $cnt; $n++) {
2852                                         $herectx .= raw_line($linenr, $n) . "\n";
2853                                 }
2854
2855                                 if ($dstat =~ /;/) {
2856                                         ERROR("MULTISTATEMENT_MACRO_USE_DO_WHILE",
2857                                               "Macros with multiple statements should be enclosed in a do - while loop\n" . "$herectx");
2858                                 } else {
2859                                         ERROR("COMPLEX_MACRO",
2860                                               "Macros with complex values should be enclosed in parenthesis\n" . "$herectx");
2861                                 }
2862                         }
2863                 }
2864
2865 # make sure symbols are always wrapped with VMLINUX_SYMBOL() ...
2866 # all assignments may have only one of the following with an assignment:
2867 #       .
2868 #       ALIGN(...)
2869 #       VMLINUX_SYMBOL(...)
2870                 if ($realfile eq 'vmlinux.lds.h' && $line =~ /(?:(?:^|\s)$Ident\s*=|=\s*$Ident(?:\s|$))/) {
2871                         WARN("MISSING_VMLINUX_SYMBOL",
2872                              "vmlinux.lds.h needs VMLINUX_SYMBOL() around C-visible symbols\n" . $herecurr);
2873                 }
2874
2875 # check for redundant bracing round if etc
2876                 if ($line =~ /(^.*)\bif\b/ && $1 !~ /else\s*$/) {
2877                         my ($level, $endln, @chunks) =
2878                                 ctx_statement_full($linenr, $realcnt, 1);
2879                         #print "chunks<$#chunks> linenr<$linenr> endln<$endln> level<$level>\n";
2880                         #print "APW: <<$chunks[1][0]>><<$chunks[1][1]>>\n";
2881                         if ($#chunks > 0 && $level == 0) {
2882                                 my $allowed = 0;
2883                                 my $seen = 0;
2884                                 my $herectx = $here . "\n";
2885                                 my $ln = $linenr - 1;
2886                                 for my $chunk (@chunks) {
2887                                         my ($cond, $block) = @{$chunk};
2888
2889                                         # If the condition carries leading newlines, then count those as offsets.
2890                                         my ($whitespace) = ($cond =~ /^((?:\s*\n[+-])*\s*)/s);
2891                                         my $offset = statement_rawlines($whitespace) - 1;
2892
2893                                         #print "COND<$cond> whitespace<$whitespace> offset<$offset>\n";
2894
2895                                         # We have looked at and allowed this specific line.
2896                                         $suppress_ifbraces{$ln + $offset} = 1;
2897
2898                                         $herectx .= "$rawlines[$ln + $offset]\n[...]\n";
2899                                         $ln += statement_rawlines($block) - 1;
2900
2901                                         substr($block, 0, length($cond), '');
2902
2903                                         $seen++ if ($block =~ /^\s*{/);
2904
2905                                         #print "cond<$cond> block<$block> allowed<$allowed>\n";
2906                                         if (statement_lines($cond) > 1) {
2907                                                 #print "APW: ALLOWED: cond<$cond>\n";
2908                                                 $allowed = 1;
2909                                         }
2910                                         if ($block =~/\b(?:if|for|while)\b/) {
2911                                                 #print "APW: ALLOWED: block<$block>\n";
2912                                                 $allowed = 1;
2913                                         }
2914                                         if (statement_block_size($block) > 1) {
2915                                                 #print "APW: ALLOWED: lines block<$block>\n";
2916                                                 $allowed = 1;
2917                                         }
2918                                 }
2919                                 if ($seen && !$allowed) {
2920                                         WARN("BRACES",
2921                                              "braces {} are not necessary for any arm of this statement\n" . $herectx);
2922                                 }
2923                         }
2924                 }
2925                 if (!defined $suppress_ifbraces{$linenr - 1} &&
2926                                         $line =~ /\b(if|while|for|else)\b/) {
2927                         my $allowed = 0;
2928
2929                         # Check the pre-context.
2930                         if (substr($line, 0, $-[0]) =~ /(\}\s*)$/) {
2931                                 #print "APW: ALLOWED: pre<$1>\n";
2932                                 $allowed = 1;
2933                         }
2934
2935                         my ($level, $endln, @chunks) =
2936                                 ctx_statement_full($linenr, $realcnt, $-[0]);
2937
2938                         # Check the condition.
2939                         my ($cond, $block) = @{$chunks[0]};
2940                         #print "CHECKING<$linenr> cond<$cond> block<$block>\n";
2941                         if (defined $cond) {
2942                                 substr($block, 0, length($cond), '');
2943                         }
2944                         if (statement_lines($cond) > 1) {
2945                                 #print "APW: ALLOWED: cond<$cond>\n";
2946                                 $allowed = 1;
2947                         }
2948                         if ($block =~/\b(?:if|for|while)\b/) {
2949                                 #print "APW: ALLOWED: block<$block>\n";
2950                                 $allowed = 1;
2951                         }
2952                         if (statement_block_size($block) > 1) {
2953                                 #print "APW: ALLOWED: lines block<$block>\n";
2954                                 $allowed = 1;
2955                         }
2956                         # Check the post-context.
2957                         if (defined $chunks[1]) {
2958                                 my ($cond, $block) = @{$chunks[1]};
2959                                 if (defined $cond) {
2960                                         substr($block, 0, length($cond), '');
2961                                 }
2962                                 if ($block =~ /^\s*\{/) {
2963                                         #print "APW: ALLOWED: chunk-1 block<$block>\n";
2964                                         $allowed = 1;
2965                                 }
2966                         }
2967                         if ($level == 0 && $block =~ /^\s*\{/ && !$allowed) {
2968                                 my $herectx = $here . "\n";
2969                                 my $cnt = statement_rawlines($block);
2970
2971                                 for (my $n = 0; $n < $cnt; $n++) {
2972                                         $herectx .= raw_line($linenr, $n) . "\n";
2973                                 }
2974
2975                                 WARN("BRACES",
2976                                      "braces {} are not necessary for single statement blocks\n" . $herectx);
2977                         }
2978                 }
2979
2980 # don't include deprecated include files (uses RAW line)
2981                 for my $inc (@dep_includes) {
2982                         if ($rawline =~ m@^.\s*\#\s*include\s*\<$inc>@) {
2983                                 ERROR("DEPRECATED_INCLUDE",
2984                                       "Don't use <$inc>: see Documentation/feature-removal-schedule.txt\n" . $herecurr);
2985                         }
2986                 }
2987
2988 # don't use deprecated functions
2989                 for my $func (@dep_functions) {
2990                         if ($line =~ /\b$func\b/) {
2991                                 ERROR("DEPRECATED_FUNCTION",
2992                                       "Don't use $func(): see Documentation/feature-removal-schedule.txt\n" . $herecurr);
2993                         }
2994                 }
2995
2996 # no volatiles please
2997                 my $asm_volatile = qr{\b(__asm__|asm)\s+(__volatile__|volatile)\b};
2998                 if ($line =~ /\bvolatile\b/ && $line !~ /$asm_volatile/) {
2999                         WARN("VOLATILE",
3000                              "Use of volatile is usually wrong: see Documentation/volatile-considered-harmful.txt\n" . $herecurr);
3001                 }
3002
3003 # warn about #if 0
3004                 if ($line =~ /^.\s*\#\s*if\s+0\b/) {
3005                         CHK("REDUNDANT_CODE",
3006                             "if this code is redundant consider removing it\n" .
3007                                 $herecurr);
3008                 }
3009
3010 # check for needless kfree() checks
3011                 if ($prevline =~ /\bif\s*\(([^\)]*)\)/) {
3012                         my $expr = $1;
3013                         if ($line =~ /\bkfree\(\Q$expr\E\);/) {
3014                                 WARN("NEEDLESS_KFREE",
3015                                      "kfree(NULL) is safe this check is probably not required\n" . $hereprev);
3016                         }
3017                 }
3018 # check for needless usb_free_urb() checks
3019                 if ($prevline =~ /\bif\s*\(([^\)]*)\)/) {
3020                         my $expr = $1;
3021                         if ($line =~ /\busb_free_urb\(\Q$expr\E\);/) {
3022                                 WARN("NEEDLESS_USB_FREE_URB",
3023                                      "usb_free_urb(NULL) is safe this check is probably not required\n" . $hereprev);
3024                         }
3025                 }
3026
3027 # prefer usleep_range over udelay
3028                 if ($line =~ /\budelay\s*\(\s*(\w+)\s*\)/) {
3029                         # ignore udelay's < 10, however
3030                         if (! (($1 =~ /(\d+)/) && ($1 < 10)) ) {
3031                                 CHK("USLEEP_RANGE",
3032                                     "usleep_range is preferred over udelay; see Documentation/timers/timers-howto.txt\n" . $line);
3033                         }
3034                 }
3035
3036 # warn about unexpectedly long msleep's
3037                 if ($line =~ /\bmsleep\s*\((\d+)\);/) {
3038                         if ($1 < 20) {
3039                                 WARN("MSLEEP",
3040                                      "msleep < 20ms can sleep for up to 20ms; see Documentation/timers/timers-howto.txt\n" . $line);
3041                         }
3042                 }
3043
3044 # warn about #ifdefs in C files
3045 #               if ($line =~ /^.\s*\#\s*if(|n)def/ && ($realfile =~ /\.c$/)) {
3046 #                       print "#ifdef in C files should be avoided\n";
3047 #                       print "$herecurr";
3048 #                       $clean = 0;
3049 #               }
3050
3051 # warn about spacing in #ifdefs
3052                 if ($line =~ /^.\s*\#\s*(ifdef|ifndef|elif)\s\s+/) {
3053                         ERROR("SPACING",
3054                               "exactly one space required after that #$1\n" . $herecurr);
3055                 }
3056
3057 # check for spinlock_t definitions without a comment.
3058                 if ($line =~ /^.\s*(struct\s+mutex|spinlock_t)\s+\S+;/ ||
3059                     $line =~ /^.\s*(DEFINE_MUTEX)\s*\(/) {
3060                         my $which = $1;
3061                         if (!ctx_has_comment($first_line, $linenr)) {
3062                                 CHK("UNCOMMENTED_DEFINITION",
3063                                     "$1 definition without comment\n" . $herecurr);
3064                         }
3065                 }
3066 # check for memory barriers without a comment.
3067                 if ($line =~ /\b(mb|rmb|wmb|read_barrier_depends|smp_mb|smp_rmb|smp_wmb|smp_read_barrier_depends)\(/) {
3068                         if (!ctx_has_comment($first_line, $linenr)) {
3069                                 CHK("MEMORY_BARRIER",
3070                                     "memory barrier without comment\n" . $herecurr);
3071                         }
3072                 }
3073 # check of hardware specific defines
3074                 if ($line =~ m@^.\s*\#\s*if.*\b(__i386__|__powerpc64__|__sun__|__s390x__)\b@ && $realfile !~ m@include/asm-@) {
3075                         CHK("ARCH_DEFINES",
3076                             "architecture specific defines should be avoided\n" .  $herecurr);
3077                 }
3078
3079 # Check that the storage class is at the beginning of a declaration
3080                 if ($line =~ /\b$Storage\b/ && $line !~ /^.\s*$Storage\b/) {
3081                         WARN("STORAGE_CLASS",
3082                              "storage class should be at the beginning of the declaration\n" . $herecurr)
3083                 }
3084
3085 # check the location of the inline attribute, that it is between
3086 # storage class and type.
3087                 if ($line =~ /\b$Type\s+$Inline\b/ ||
3088                     $line =~ /\b$Inline\s+$Storage\b/) {
3089                         ERROR("INLINE_LOCATION",
3090                               "inline keyword should sit between storage class and type\n" . $herecurr);
3091                 }
3092
3093 # Check for __inline__ and __inline, prefer inline
3094                 if ($line =~ /\b(__inline__|__inline)\b/) {
3095                         WARN("INLINE",
3096                              "plain inline is preferred over $1\n" . $herecurr);
3097                 }
3098
3099 # Check for __attribute__ packed, prefer __packed
3100                 if ($line =~ /\b__attribute__\s*\(\s*\(.*\bpacked\b/) {
3101                         WARN("PREFER_PACKED",
3102                              "__packed is preferred over __attribute__((packed))\n" . $herecurr);
3103                 }
3104
3105 # Check for __attribute__ aligned, prefer __aligned
3106                 if ($line =~ /\b__attribute__\s*\(\s*\(.*aligned/) {
3107                         WARN("PREFER_ALIGNED",
3108                              "__aligned(size) is preferred over __attribute__((aligned(size)))\n" . $herecurr);
3109                 }
3110
3111 # Check for __attribute__ format(printf, prefer __printf
3112                 if ($line =~ /\b__attribute__\s*\(\s*\(\s*format\s*\(\s*printf/) {
3113                         WARN("PREFER_PRINTF",
3114                              "__printf(string-index, first-to-check) is preferred over __attribute__((format(printf, string-index, first-to-check)))\n" . $herecurr);
3115                 }
3116
3117 # check for sizeof(&)
3118                 if ($line =~ /\bsizeof\s*\(\s*\&/) {
3119                         WARN("SIZEOF_ADDRESS",
3120                              "sizeof(& should be avoided\n" . $herecurr);
3121                 }
3122
3123 # check for line continuations in quoted strings with odd counts of "
3124                 if ($rawline =~ /\\$/ && $rawline =~ tr/"/"/ % 2) {
3125                         WARN("LINE_CONTINUATIONS",
3126                              "Avoid line continuations in quoted strings\n" . $herecurr);
3127                 }
3128
3129 # Check for misused memsets
3130                 if (defined $stat &&
3131                     $stat =~ /^\+(?:.*?)\bmemset\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\,\s*$FuncArg\s*\)/s) {
3132
3133                         my $ms_addr = $2;
3134                         my $ms_val = $8;
3135                         my $ms_size = $14;
3136
3137                         if ($ms_size =~ /^(0x|)0$/i) {
3138                                 ERROR("MEMSET",
3139                                       "memset to 0's uses 0 as the 2nd argument, not the 3rd\n" . "$here\n$stat\n");
3140                         } elsif ($ms_size =~ /^(0x|)1$/i) {
3141                                 WARN("MEMSET",
3142                                      "single byte memset is suspicious. Swapped 2nd/3rd argument?\n" . "$here\n$stat\n");
3143                         }
3144                 }
3145
3146 # typecasts on min/max could be min_t/max_t
3147                 if (defined $stat &&
3148                     $stat =~ /^\+(?:.*?)\b(min|max)\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\)/) {
3149                         if (defined $2 || defined $8) {
3150                                 my $call = $1;
3151                                 my $cast1 = deparenthesize($2);
3152                                 my $arg1 = $3;
3153                                 my $cast2 = deparenthesize($8);
3154                                 my $arg2 = $9;
3155                                 my $cast;
3156
3157                                 if ($cast1 ne "" && $cast2 ne "") {
3158                                         $cast = "$cast1 or $cast2";
3159                                 } elsif ($cast1 ne "") {
3160                                         $cast = $cast1;
3161                                 } else {
3162                                         $cast = $cast2;
3163                                 }
3164                                 WARN("MINMAX",
3165                                      "$call() should probably be ${call}_t($cast, $arg1, $arg2)\n" . "$here\n$stat\n");
3166                         }
3167                 }
3168
3169 # check for new externs in .c files.
3170                 if ($realfile =~ /\.c$/ && defined $stat &&
3171                     $stat =~ /^.\s*(?:extern\s+)?$Type\s+($Ident)(\s*)\(/s)
3172                 {
3173                         my $function_name = $1;
3174                         my $paren_space = $2;
3175
3176                         my $s = $stat;
3177                         if (defined $cond) {
3178                                 substr($s, 0, length($cond), '');
3179                         }
3180                         if ($s =~ /^\s*;/ &&
3181                             $function_name ne 'uninitialized_var')
3182                         {
3183                                 WARN("AVOID_EXTERNS",
3184                                      "externs should be avoided in .c files\n" .  $herecurr);
3185                         }
3186
3187                         if ($paren_space =~ /\n/) {
3188                                 WARN("FUNCTION_ARGUMENTS",
3189                                      "arguments for function declarations should follow identifier\n" . $herecurr);
3190                         }
3191
3192                 } elsif ($realfile =~ /\.c$/ && defined $stat &&
3193                     $stat =~ /^.\s*extern\s+/)
3194                 {
3195                         WARN("AVOID_EXTERNS",
3196                              "externs should be avoided in .c files\n" .  $herecurr);
3197                 }
3198
3199 # checks for new __setup's
3200                 if ($rawline =~ /\b__setup\("([^"]*)"/) {
3201                         my $name = $1;
3202
3203                         if (!grep(/$name/, @setup_docs)) {
3204                                 CHK("UNDOCUMENTED_SETUP",
3205                                     "__setup appears un-documented -- check Documentation/kernel-parameters.txt\n" . $herecurr);
3206                         }
3207                 }
3208
3209 # check for pointless casting of kmalloc return
3210                 if ($line =~ /\*\s*\)\s*[kv][czm]alloc(_node){0,1}\b/) {
3211                         WARN("UNNECESSARY_CASTS",
3212                              "unnecessary cast may hide bugs, see http://c-faq.com/malloc/mallocnocast.html\n" . $herecurr);
3213                 }
3214
3215 # check for multiple semicolons
3216                 if ($line =~ /;\s*;\s*$/) {
3217                     WARN("ONE_SEMICOLON",
3218                          "Statements terminations use 1 semicolon\n" . $herecurr);
3219                 }
3220
3221 # check for gcc specific __FUNCTION__
3222                 if ($line =~ /__FUNCTION__/) {
3223                         WARN("USE_FUNC",
3224                              "__func__ should be used instead of gcc specific __FUNCTION__\n"  . $herecurr);
3225                 }
3226
3227 # check for semaphores initialized locked
3228                 if ($line =~ /^.\s*sema_init.+,\W?0\W?\)/) {
3229                         WARN("CONSIDER_COMPLETION",
3230                              "consider using a completion\n" . $herecurr);
3231
3232                 }
3233 # recommend kstrto* over simple_strto* and strict_strto*
3234                 if ($line =~ /\b((simple|strict)_(strto(l|ll|ul|ull)))\s*\(/) {
3235                         WARN("CONSIDER_KSTRTO",
3236                              "$1 is obsolete, use k$3 instead\n" . $herecurr);
3237                 }
3238 # check for __initcall(), use device_initcall() explicitly please
3239                 if ($line =~ /^.\s*__initcall\s*\(/) {
3240                         WARN("USE_DEVICE_INITCALL",
3241                              "please use device_initcall() instead of __initcall()\n" . $herecurr);
3242                 }
3243 # check for various ops structs, ensure they are const.
3244                 my $struct_ops = qr{acpi_dock_ops|
3245                                 address_space_operations|
3246                                 backlight_ops|
3247                                 block_device_operations|
3248                                 dentry_operations|
3249                                 dev_pm_ops|
3250                                 dma_map_ops|
3251                                 extent_io_ops|
3252                                 file_lock_operations|
3253                                 file_operations|
3254                                 hv_ops|
3255                                 ide_dma_ops|
3256                                 intel_dvo_dev_ops|
3257                                 item_operations|
3258                                 iwl_ops|
3259                                 kgdb_arch|
3260                                 kgdb_io|
3261                                 kset_uevent_ops|
3262                                 lock_manager_operations|
3263                                 microcode_ops|
3264                                 mtrr_ops|
3265                                 neigh_ops|
3266                                 nlmsvc_binding|
3267                                 pci_raw_ops|
3268                                 pipe_buf_operations|
3269                                 platform_hibernation_ops|
3270                                 platform_suspend_ops|
3271                                 proto_ops|
3272                                 rpc_pipe_ops|
3273                                 seq_operations|
3274                                 snd_ac97_build_ops|
3275                                 soc_pcmcia_socket_ops|
3276                                 stacktrace_ops|
3277                                 sysfs_ops|
3278                                 tty_operations|
3279                                 usb_mon_operations|
3280                                 wd_ops}x;
3281                 if ($line !~ /\bconst\b/ &&
3282                     $line =~ /\bstruct\s+($struct_ops)\b/) {
3283                         WARN("CONST_STRUCT",
3284                              "struct $1 should normally be const\n" .
3285                                 $herecurr);
3286                 }
3287
3288 # use of NR_CPUS is usually wrong
3289 # ignore definitions of NR_CPUS and usage to define arrays as likely right
3290                 if ($line =~ /\bNR_CPUS\b/ &&
3291                     $line !~ /^.\s*\s*#\s*if\b.*\bNR_CPUS\b/ &&
3292                     $line !~ /^.\s*\s*#\s*define\b.*\bNR_CPUS\b/ &&
3293                     $line !~ /^.\s*$Declare\s.*\[[^\]]*NR_CPUS[^\]]*\]/ &&
3294                     $line !~ /\[[^\]]*\.\.\.[^\]]*NR_CPUS[^\]]*\]/ &&
3295                     $line !~ /\[[^\]]*NR_CPUS[^\]]*\.\.\.[^\]]*\]/)
3296                 {
3297                         WARN("NR_CPUS",
3298                              "usage of NR_CPUS is often wrong - consider using cpu_possible(), num_possible_cpus(), for_each_possible_cpu(), etc\n" . $herecurr);
3299                 }
3300
3301 # check for %L{u,d,i} in strings
3302                 my $string;
3303                 while ($line =~ /(?:^|")([X\t]*)(?:"|$)/g) {
3304                         $string = substr($rawline, $-[1], $+[1] - $-[1]);
3305                         $string =~ s/%%/__/g;
3306                         if ($string =~ /(?<!%)%L[udi]/) {
3307                                 WARN("PRINTF_L",
3308                                      "\%Ld/%Lu are not-standard C, use %lld/%llu\n" . $herecurr);
3309                                 last;
3310                         }
3311                 }
3312
3313 # whine mightly about in_atomic
3314                 if ($line =~ /\bin_atomic\s*\(/) {
3315                         if ($realfile =~ m@^drivers/@) {
3316                                 ERROR("IN_ATOMIC",
3317                                       "do not use in_atomic in drivers\n" . $herecurr);
3318                         } elsif ($realfile !~ m@^kernel/@) {
3319                                 WARN("IN_ATOMIC",
3320                                      "use of in_atomic() is incorrect outside core kernel code\n" . $herecurr);
3321                         }
3322                 }
3323
3324 # check for lockdep_set_novalidate_class
3325                 if ($line =~ /^.\s*lockdep_set_novalidate_class\s*\(/ ||
3326                     $line =~ /__lockdep_no_validate__\s*\)/ ) {
3327                         if ($realfile !~ m@^kernel/lockdep@ &&
3328                             $realfile !~ m@^include/linux/lockdep@ &&
3329                             $realfile !~ m@^drivers/base/core@) {
3330                                 ERROR("LOCKDEP",
3331                                       "lockdep_no_validate class is reserved for device->mutex.\n" . $herecurr);
3332                         }
3333                 }
3334
3335                 if ($line =~ /debugfs_create_file.*S_IWUGO/ ||
3336                     $line =~ /DEVICE_ATTR.*S_IWUGO/ ) {
3337                         WARN("EXPORTED_WORLD_WRITABLE",
3338                              "Exporting world writable files is usually an error. Consider more restrictive permissions.\n" . $herecurr);
3339                 }
3340         }
3341
3342         # If we have no input at all, then there is nothing to report on
3343         # so just keep quiet.
3344         if ($#rawlines == -1) {
3345                 exit(0);
3346         }
3347
3348         # In mailback mode only produce a report in the negative, for
3349         # things that appear to be patches.
3350         if ($mailback && ($clean == 1 || !$is_patch)) {
3351                 exit(0);
3352         }
3353
3354         # This is not a patch, and we are are in 'no-patch' mode so
3355         # just keep quiet.
3356         if (!$chk_patch && !$is_patch) {
3357                 exit(0);
3358         }
3359
3360         if (!$is_patch) {
3361                 ERROR("NOT_UNIFIED_DIFF",
3362                       "Does not appear to be a unified-diff format patch\n");
3363         }
3364         if ($is_patch && $chk_signoff && $signoff == 0) {
3365                 ERROR("MISSING_SIGN_OFF",
3366                       "Missing Signed-off-by: line(s)\n");
3367         }
3368
3369         print report_dump();
3370         if ($summary && !($clean == 1 && $quiet == 1)) {
3371                 print "$filename " if ($summary_file);
3372                 print "total: $cnt_error errors, $cnt_warn warnings, " .
3373                         (($check)? "$cnt_chk checks, " : "") .
3374                         "$cnt_lines lines checked\n";
3375                 print "\n" if ($quiet == 0);
3376         }
3377
3378         if ($quiet == 0) {
3379                 # If there were whitespace errors which cleanpatch can fix
3380                 # then suggest that.
3381                 if ($rpt_cleaners) {
3382                         print "NOTE: whitespace errors detected, you may wish to use scripts/cleanpatch or\n";
3383                         print "      scripts/cleanfile\n\n";
3384                         $rpt_cleaners = 0;
3385                 }
3386         }
3387
3388         if (keys %ignore_type) {
3389             print "NOTE: Ignored message types:";
3390             foreach my $ignore (sort keys %ignore_type) {
3391                 print " $ignore";
3392             }
3393             print "\n";
3394             print "\n" if ($quiet == 0);
3395         }
3396
3397         if ($clean == 1 && $quiet == 0) {
3398                 print "$vname has no obvious style problems and is ready for submission.\n"
3399         }
3400         if ($clean == 0 && $quiet == 0) {
3401                 print << "EOM";
3402 $vname has style problems, please review.
3403
3404 If any of these errors are false positives, please report
3405 them to the maintainer, see CHECKPATCH in MAINTAINERS.
3406 EOM
3407         }
3408
3409         return $clean;
3410 }