config/spl-build.m4

   1 ###############################################################################
   2 # Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
   3 # Copyright (C) 2007 The Regents of the University of California.
   4 # Written by Brian Behlendorf <behlendorf1@llnl.gov>.
   5 ###############################################################################
   6 # SPL_AC_CONFIG_KERNEL: Default SPL kernel configuration.
   7 ###############################################################################
   8
   9 AC_DEFUN([SPL_AC_CONFIG_KERNEL], [
  10         SPL_AC_KERNEL
  11         SPL_AC_KERNEL_CONFIG
  12
  13         if test "${LINUX_OBJ}" != "${LINUX}"; then
  14                 KERNELMAKE_PARAMS="$KERNELMAKE_PARAMS O=$LINUX_OBJ"
  15         fi
  16         AC_SUBST(KERNELMAKE_PARAMS)
  17
  18         KERNELCPPFLAGS="$KERNELCPPFLAGS -Wstrict-prototypes"
  19         AC_SUBST(KERNELCPPFLAGS)
  20
  21         SPL_AC_DEBUG
  22         SPL_AC_DEBUG_LOG
  23         SPL_AC_DEBUG_KMEM
  24         SPL_AC_DEBUG_KMEM_TRACKING
  25         SPL_AC_ATOMIC_SPINLOCK
  26         SPL_AC_TYPE_ATOMIC64_CMPXCHG
  27         SPL_AC_TYPE_ATOMIC64_XCHG
  28         SPL_AC_TYPE_UINTPTR_T
  29         SPL_AC_3ARGS_INIT_WORK
  30         SPL_AC_2ARGS_REGISTER_SYSCTL
  31         SPL_AC_SET_SHRINKER
  32         SPL_AC_3ARGS_SHRINKER_CALLBACK
  33         SPL_AC_PATH_IN_NAMEIDATA
  34         SPL_AC_TASK_CURR
  35         SPL_AC_CTL_UNNUMBERED
  36         SPL_AC_CTL_NAME
  37         SPL_AC_FLS64
  38         SPL_AC_DEVICE_CREATE
  39         SPL_AC_5ARGS_DEVICE_CREATE
  40         SPL_AC_CLASS_DEVICE_CREATE
  41         SPL_AC_SET_NORMALIZED_TIMESPEC_EXPORT
  42         SPL_AC_SET_NORMALIZED_TIMESPEC_INLINE
  43         SPL_AC_TIMESPEC_SUB
  44         SPL_AC_INIT_UTSNAME
  45         SPL_AC_FDTABLE_HEADER
  46         SPL_AC_FILES_FDTABLE
  47         SPL_AC_CLEAR_CLOSE_ON_EXEC
  48         SPL_AC_UACCESS_HEADER
  49         SPL_AC_KMALLOC_NODE
  50         SPL_AC_MONOTONIC_CLOCK
  51         SPL_AC_INODE_I_MUTEX
  52         SPL_AC_MUTEX_OWNER
  53         SPL_AC_MUTEX_OWNER_TASK_STRUCT
  54         SPL_AC_MUTEX_LOCK_NESTED
  55         SPL_AC_3ARGS_ON_EACH_CPU
  56         SPL_AC_KALLSYMS_LOOKUP_NAME
  57         SPL_AC_GET_VMALLOC_INFO
  58         SPL_AC_PGDAT_HELPERS
  59         SPL_AC_FIRST_ONLINE_PGDAT
  60         SPL_AC_NEXT_ONLINE_PGDAT
  61         SPL_AC_NEXT_ZONE
  62         SPL_AC_PGDAT_LIST
  63         SPL_AC_GLOBAL_PAGE_STATE
  64         SPL_AC_ZONE_STAT_ITEM_FREE
  65         SPL_AC_ZONE_STAT_ITEM_INACTIVE
  66         SPL_AC_ZONE_STAT_ITEM_ACTIVE
  67         SPL_AC_GET_ZONE_COUNTS
  68         SPL_AC_USER_PATH_DIR
  69         SPL_AC_SET_FS_PWD
  70         SPL_AC_2ARGS_SET_FS_PWD
  71         SPL_AC_2ARGS_VFS_UNLINK
  72         SPL_AC_4ARGS_VFS_RENAME
  73         SPL_AC_VFS_FSYNC
  74         SPL_AC_2ARGS_VFS_FSYNC
  75         SPL_AC_FS_STRUCT_SPINLOCK
  76         SPL_AC_CRED_STRUCT
  77         SPL_AC_GROUPS_SEARCH
  78         SPL_AC_PUT_TASK_STRUCT
  79         SPL_AC_5ARGS_PROC_HANDLER
  80         SPL_AC_KVASPRINTF
  81         SPL_AC_EXPORTED_RWSEM_IS_LOCKED
  82         SPL_AC_KERNEL_INVALIDATE_INODES
  83         SPL_AC_KERNEL_2ARGS_INVALIDATE_INODES
  84         SPL_AC_SHRINK_DCACHE_MEMORY
  85         SPL_AC_SHRINK_ICACHE_MEMORY
  86         SPL_AC_KERN_PATH_PARENT_HEADER
  87         SPL_AC_KERN_PATH_PARENT_SYMBOL
  88         SPL_AC_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE
  89         SPL_AC_SHRINK_CONTROL_STRUCT
  90         SPL_AC_RWSEM_SPINLOCK_IS_RAW
  91 ])
  92
  93 AC_DEFUN([SPL_AC_MODULE_SYMVERS], [
  94         modpost=$LINUX/scripts/Makefile.modpost
  95         AC_MSG_CHECKING([kernel file name for module symbols])
  96         if test -f "$modpost"; then
  97                 if grep -q Modules.symvers $modpost; then
  98                         LINUX_SYMBOLS=Modules.symvers
  99                 else
 100                         LINUX_SYMBOLS=Module.symvers
 101                 fi
 102
 103                 if ! test -f "$LINUX_OBJ/$LINUX_SYMBOLS"; then
 104                         AC_MSG_ERROR([
 105         *** Please make sure the kernel devel package for your distribution
 106         *** is installed.  If your building with a custom kernel make sure the
 107         *** kernel is configured, built, and the '--with-linux=PATH' configure
 108         *** option refers to the location of the kernel source.])
 109                 fi
 110         else
 111                 LINUX_SYMBOLS=NONE
 112         fi
 113         AC_MSG_RESULT($LINUX_SYMBOLS)
 114         AC_SUBST(LINUX_SYMBOLS)
 115 ])
 116
 117 AC_DEFUN([SPL_AC_KERNEL], [
 118         AC_ARG_WITH([linux],
 119                 AS_HELP_STRING([--with-linux=PATH],
 120                 [Path to kernel source]),
 121                 [kernelsrc="$withval"])
 122
 123         AC_ARG_WITH([linux-obj],
 124                 AS_HELP_STRING([--with-linux-obj=PATH],
 125                 [Path to kernel build objects]),
 126                 [kernelbuild="$withval"])
 127
 128         AC_MSG_CHECKING([kernel source directory])
 129         if test -z "$kernelsrc"; then
 130                 if test -e "/lib/modules/$(uname -r)/source"; then
 131                         headersdir="/lib/modules/$(uname -r)/source"
 132                         sourcelink=$(readlink -f "$headersdir")
 133                 elif test -e "/lib/modules/$(uname -r)/build"; then
 134                         headersdir="/lib/modules/$(uname -r)/build"
 135                         sourcelink=$(readlink -f "$headersdir")
 136                 else
 137                         sourcelink=$(ls -1d /usr/src/kernels/* \
 138                                      /usr/src/linux-* \
 139                                      2>/dev/null | grep -v obj | tail -1)
 140                 fi
 141
 142                 if test -n "$sourcelink" && test -e ${sourcelink}; then
 143                         kernelsrc=`readlink -f ${sourcelink}`
 144                 else
 145                         AC_MSG_RESULT([Not found])
 146                         AC_MSG_ERROR([
 147         *** Please make sure the kernel devel package for your distribution
 148         *** is installed then try again.  If that fails you can specify the
 149         *** location of the kernel source with the '--with-linux=PATH' option.])
 150                 fi
 151         else
 152                 if test "$kernelsrc" = "NONE"; then
 153                         kernsrcver=NONE
 154                 fi
 155         fi
 156
 157         AC_MSG_RESULT([$kernelsrc])
 158         AC_MSG_CHECKING([kernel build directory])
 159         if test -z "$kernelbuild"; then
 160                 if test -e "/lib/modules/$(uname -r)/build"; then
 161                         kernelbuild=`readlink -f /lib/modules/$(uname -r)/build`
 162                 elif test -d ${kernelsrc}-obj/${target_cpu}/${target_cpu}; then
 163                         kernelbuild=${kernelsrc}-obj/${target_cpu}/${target_cpu}
 164                 elif test -d ${kernelsrc}-obj/${target_cpu}/default; then
 165                         kernelbuild=${kernelsrc}-obj/${target_cpu}/default
 166                 elif test -d `dirname ${kernelsrc}`/build-${target_cpu}; then
 167                         kernelbuild=`dirname ${kernelsrc}`/build-${target_cpu}
 168                 else
 169                         kernelbuild=${kernelsrc}
 170                 fi
 171         fi
 172         AC_MSG_RESULT([$kernelbuild])
 173
 174         AC_MSG_CHECKING([kernel source version])
 175         utsrelease1=$kernelbuild/include/linux/version.h
 176         utsrelease2=$kernelbuild/include/linux/utsrelease.h
 177         utsrelease3=$kernelbuild/include/generated/utsrelease.h
 178         if test -r $utsrelease1 && fgrep -q UTS_RELEASE $utsrelease1; then
 179                 utsrelease=linux/version.h
 180         elif test -r $utsrelease2 && fgrep -q UTS_RELEASE $utsrelease2; then
 181                 utsrelease=linux/utsrelease.h
 182         elif test -r $utsrelease3 && fgrep -q UTS_RELEASE $utsrelease3; then
 183                 utsrelease=generated/utsrelease.h
 184         fi
 185
 186         if test "$utsrelease"; then
 187                 kernsrcver=`(echo "#include <$utsrelease>";
 188                              echo "kernsrcver=UTS_RELEASE") |
 189                              cpp -I $kernelbuild/include |
 190                              grep "^kernsrcver=" | cut -d \" -f 2`
 191
 192                 if test -z "$kernsrcver"; then
 193                         AC_MSG_RESULT([Not found])
 194                         AC_MSG_ERROR([*** Cannot determine kernel version.])
 195                 fi
 196         else
 197                 AC_MSG_RESULT([Not found])
 198                 AC_MSG_ERROR([*** Cannot find UTS_RELEASE definition.])
 199         fi
 200
 201         AC_MSG_RESULT([$kernsrcver])
 202
 203         LINUX=${kernelsrc}
 204         LINUX_OBJ=${kernelbuild}
 205         LINUX_VERSION=${kernsrcver}
 206
 207         AC_SUBST(LINUX)
 208         AC_SUBST(LINUX_OBJ)
 209         AC_SUBST(LINUX_VERSION)
 210
 211         SPL_AC_MODULE_SYMVERS
 212 ])
 213
 214 AC_DEFUN([SPL_AC_KERNEL_CONFIG], [
 215         SPL_LINUX_CONFIG([PREEMPT],
 216                 AC_MSG_ERROR([
 217                 *** Kernel built with CONFIG_PREEMPT which is not supported.
 218                 ** You must rebuild your kernel without this option.]), [])
 219 ])
 220
 221 dnl #
 222 dnl # Default SPL user configuration
 223 dnl #
 224 AC_DEFUN([SPL_AC_CONFIG_USER], [])
 225
 226 dnl #
 227 dnl # Check for rpm+rpmbuild to build RPM packages.  If these tools
 228 dnl # are missing it is non-fatal but you will not be able to build
 229 dnl # RPM packages and will be warned if you try too.
 230 dnl #
 231 AC_DEFUN([SPL_AC_RPM], [
 232         RPM=rpm
 233         RPMBUILD=rpmbuild
 234
 235         AC_MSG_CHECKING([whether $RPM is available])
 236         AS_IF([tmp=$($RPM --version 2>/dev/null)], [
 237                 RPM_VERSION=$(echo $tmp | $AWK '/RPM/ { print $[3] }')
 238                 HAVE_RPM=yes
 239                 AC_MSG_RESULT([$HAVE_RPM ($RPM_VERSION)])
 240         ],[
 241                 HAVE_RPM=no
 242                 AC_MSG_RESULT([$HAVE_RPM])
 243         ])
 244
 245         AC_MSG_CHECKING([whether $RPMBUILD is available])
 246         AS_IF([tmp=$($RPMBUILD --version 2>/dev/null)], [
 247                 RPMBUILD_VERSION=$(echo $tmp | $AWK '/RPM/ { print $[3] }')
 248                 HAVE_RPMBUILD=yes
 249                 AC_MSG_RESULT([$HAVE_RPMBUILD ($RPMBUILD_VERSION)])
 250         ],[
 251                 HAVE_RPMBUILD=no
 252                 AC_MSG_RESULT([$HAVE_RPMBUILD])
 253         ])
 254
 255         AC_SUBST(HAVE_RPM)
 256         AC_SUBST(RPM)
 257         AC_SUBST(RPM_VERSION)
 258
 259         AC_SUBST(HAVE_RPMBUILD)
 260         AC_SUBST(RPMBUILD)
 261         AC_SUBST(RPMBUILD_VERSION)
 262 ])
 263
 264 dnl #
 265 dnl # Check for dpkg+dpkg-buildpackage to build DEB packages.  If these
 266 dnl # tools are missing it is non-fatal but you will not be able to build
 267 dnl # DEB packages and will be warned if you try too.
 268 dnl #
 269 AC_DEFUN([SPL_AC_DPKG], [
 270         DPKG=dpkg
 271         DPKGBUILD=dpkg-buildpackage
 272
 273         AC_MSG_CHECKING([whether $DPKG is available])
 274         AS_IF([tmp=$($DPKG --version 2>/dev/null)], [
 275                 DPKG_VERSION=$(echo $tmp | $AWK '/Debian/ { print $[7] }')
 276                 HAVE_DPKG=yes
 277                 AC_MSG_RESULT([$HAVE_DPKG ($DPKG_VERSION)])
 278         ],[
 279                 HAVE_DPKG=no
 280                 AC_MSG_RESULT([$HAVE_DPKG])
 281         ])
 282
 283         AC_MSG_CHECKING([whether $DPKGBUILD is available])
 284         AS_IF([tmp=$($DPKGBUILD --version 2>/dev/null)], [
 285                 DPKGBUILD_VERSION=$(echo $tmp | \
 286                     $AWK '/Debian/ { print $[4] }' | cut -f-4 -d'.')
 287                 HAVE_DPKGBUILD=yes
 288                 AC_MSG_RESULT([$HAVE_DPKGBUILD ($DPKGBUILD_VERSION)])
 289         ],[
 290                 HAVE_DPKGBUILD=no
 291                 AC_MSG_RESULT([$HAVE_DPKGBUILD])
 292         ])
 293
 294         AC_SUBST(HAVE_DPKG)
 295         AC_SUBST(DPKG)
 296         AC_SUBST(DPKG_VERSION)
 297
 298         AC_SUBST(HAVE_DPKGBUILD)
 299         AC_SUBST(DPKGBUILD)
 300         AC_SUBST(DPKGBUILD_VERSION)
 301 ])
 302
 303 dnl #
 304 dnl # Check for pacman+makepkg to build Arch Linux packages.  If these
 305 dnl # tools are missing it is non-fatal but you will not be able to
 306 dnl # build Arch Linux packages and will be warned if you try too.
 307 dnl #
 308 AC_DEFUN([SPL_AC_PACMAN], [
 309         PACMAN=pacman
 310         MAKEPKG=makepkg
 311
 312         AC_MSG_CHECKING([whether $PACMAN is available])
 313         tmp=$($PACMAN --version 2>/dev/null)
 314         AS_IF([test -n "$tmp"], [
 315                 PACMAN_VERSION=$(echo $tmp |
 316                                  $AWK '/Pacman/ { print $[3] }' |
 317                                  $SED 's/^v//')
 318                 HAVE_PACMAN=yes
 319                 AC_MSG_RESULT([$HAVE_PACMAN ($PACMAN_VERSION)])
 320         ],[
 321                 HAVE_PACMAN=no
 322                 AC_MSG_RESULT([$HAVE_PACMAN])
 323         ])
 324
 325         AC_MSG_CHECKING([whether $MAKEPKG is available])
 326         tmp=$($MAKEPKG --version 2>/dev/null)
 327         AS_IF([test -n "$tmp"], [
 328                 MAKEPKG_VERSION=$(echo $tmp | $AWK '/makepkg/ { print $[3] }')
 329                 HAVE_MAKEPKG=yes
 330                 AC_MSG_RESULT([$HAVE_MAKEPKG ($MAKEPKG_VERSION)])
 331         ],[
 332                 HAVE_MAKEPKG=no
 333                 AC_MSG_RESULT([$HAVE_MAKEPKG])
 334         ])
 335
 336         AC_SUBST(HAVE_PACMAN)
 337         AC_SUBST(PACMAN)
 338         AC_SUBST(PACMAN_VERSION)
 339
 340         AC_SUBST(HAVE_MAKEPKG)
 341         AC_SUBST(MAKEPKG)
 342         AC_SUBST(MAKEPKG_VERSION)
 343 ])
 344
 345 dnl #
 346 dnl # Until native packaging for various different packing systems
 347 dnl # can be added the least we can do is attempt to use alien to
 348 dnl # convert the RPM packages to the needed package type.  This is
 349 dnl # a hack but so far it has worked reasonable well.
 350 dnl #
 351 AC_DEFUN([SPL_AC_ALIEN], [
 352         ALIEN=alien
 353
 354         AC_MSG_CHECKING([whether $ALIEN is available])
 355         AS_IF([tmp=$($ALIEN --version 2>/dev/null)], [
 356                 ALIEN_VERSION=$(echo $tmp | $AWK '{ print $[3] }')
 357                 HAVE_ALIEN=yes
 358                 AC_MSG_RESULT([$HAVE_ALIEN ($ALIEN_VERSION)])
 359         ],[
 360                 HAVE_ALIEN=no
 361                 AC_MSG_RESULT([$HAVE_ALIEN])
 362         ])
 363
 364         AC_SUBST(HAVE_ALIEN)
 365         AC_SUBST(ALIEN)
 366         AC_SUBST(ALIEN_VERSION)
 367 ])
 368
 369 dnl #
 370 dnl # Using the VENDOR tag from config.guess set the default
 371 dnl # package type for 'make pkg': (rpm | deb | tgz)
 372 dnl #
 373 AC_DEFUN([SPL_AC_DEFAULT_PACKAGE], [
 374         AC_MSG_CHECKING([linux distribution])
 375         if test -f /etc/toss-release ; then
 376                 VENDOR=toss ;
 377         elif test -f /etc/fedora-release ; then
 378                 VENDOR=fedora ;
 379         elif test -f /etc/redhat-release ; then
 380                 VENDOR=redhat ;
 381         elif test -f /etc/gentoo-release ; then
 382                 VENDOR=gentoo ;
 383         elif test -f /etc/arch-release ; then
 384                 VENDOR=arch ;
 385         elif test -f /etc/SuSE-release ; then
 386                 VENDOR=sles ;
 387         elif test -f /etc/slackware-version ; then
 388                 VENDOR=slackware ;
 389         elif test -f /etc/lunar.release ; then
 390                 VENDOR=lunar ;
 391         elif test -f /etc/lsb-release ; then
 392                 VENDOR=ubuntu ;
 393         elif test -f /etc/debian_version ; then
 394                 VENDOR=debian ;
 395         else
 396                 VENDOR= ;
 397         fi
 398         AC_MSG_RESULT([$VENDOR])
 399         AC_SUBST(VENDOR)
 400
 401         AC_MSG_CHECKING([default package type])
 402         case "$VENDOR" in
 403                 toss)       DEFAULT_PACKAGE=rpm  ;;
 404                 redhat)     DEFAULT_PACKAGE=rpm  ;;
 405                 fedora)     DEFAULT_PACKAGE=rpm  ;;
 406                 gentoo)     DEFAULT_PACKAGE=tgz  ;;
 407                 arch)       DEFAULT_PACKAGE=arch ;;
 408                 sles)       DEFAULT_PACKAGE=rpm  ;;
 409                 slackware)  DEFAULT_PACKAGE=tgz  ;;
 410                 lunar)      DEFAULT_PACKAGE=tgz  ;;
 411                 ubuntu)     DEFAULT_PACKAGE=deb  ;;
 412                 debian)     DEFAULT_PACKAGE=deb  ;;
 413                 *)          DEFAULT_PACKAGE=rpm  ;;
 414         esac
 415
 416         AC_MSG_RESULT([$DEFAULT_PACKAGE])
 417         AC_SUBST(DEFAULT_PACKAGE)
 418 ])
 419
 420 dnl #
 421 dnl # Default SPL user configuration
 422 dnl #
 423 AC_DEFUN([SPL_AC_PACKAGE], [
 424         SPL_AC_DEFAULT_PACKAGE
 425         SPL_AC_RPM
 426         SPL_AC_DPKG
 427         SPL_AC_ALIEN
 428
 429         AS_IF([test "$VENDOR" = "arch"], [SPL_AC_PACMAN])
 430 ])
 431
 432 AC_DEFUN([SPL_AC_LICENSE], [
 433         AC_MSG_CHECKING([spl license])
 434         LICENSE=GPL
 435         AC_MSG_RESULT([$LICENSE])
 436         KERNELCPPFLAGS="${KERNELCPPFLAGS} -DHAVE_GPL_ONLY_SYMBOLS"
 437         AC_SUBST(LICENSE)
 438 ])
 439
 440 AC_DEFUN([SPL_AC_CONFIG], [
 441         SPL_CONFIG=all
 442         AC_ARG_WITH([config],
 443                 AS_HELP_STRING([--with-config=CONFIG],
 444                 [Config file 'kernel|user|all|srpm']),
 445                 [SPL_CONFIG="$withval"])
 446
 447         AC_MSG_CHECKING([spl config])
 448         AC_MSG_RESULT([$SPL_CONFIG]);
 449         AC_SUBST(SPL_CONFIG)
 450
 451         case "$SPL_CONFIG" in
 452                 kernel) SPL_AC_CONFIG_KERNEL ;;
 453                 user)   SPL_AC_CONFIG_USER   ;;
 454                 all)    SPL_AC_CONFIG_KERNEL
 455                         SPL_AC_CONFIG_USER   ;;
 456                 srpm)                        ;;
 457                 *)
 458                 AC_MSG_RESULT([Error!])
 459                 AC_MSG_ERROR([Bad value "$SPL_CONFIG" for --with-config,
 460                               user kernel|user|all|srpm]) ;;
 461         esac
 462
 463         AM_CONDITIONAL([CONFIG_USER],
 464                        [test "$SPL_CONFIG" = user] ||
 465                        [test "$SPL_CONFIG" = all])
 466         AM_CONDITIONAL([CONFIG_KERNEL],
 467                        [test "$SPL_CONFIG" = kernel] ||
 468                        [test "$SPL_CONFIG" = all])
 469 ])
 470
 471 dnl #
 472 dnl # Enable if the SPL should be compiled with internal debugging enabled.
 473 dnl # By default this support is disabled.
 474 dnl #
 475 AC_DEFUN([SPL_AC_DEBUG], [
 476         AC_MSG_CHECKING([whether debugging is enabled])
 477         AC_ARG_ENABLE([debug],
 478                 [AS_HELP_STRING([--enable-debug],
 479                 [Enable generic debug support @<:@default=no@:>@])],
 480                 [],
 481                 [enable_debug=no])
 482
 483         AS_IF([test "x$enable_debug" = xyes],
 484         [
 485                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG -Werror"
 486                 DEBUG_CFLAGS="-DDEBUG -Werror"
 487                 DEBUG_SPL="_with_debug"
 488         ], [
 489                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DNDEBUG"
 490                 DEBUG_CFLAGS="-DNDEBUG"
 491                 DEBUG_SPL="_without_debug"
 492         ])
 493
 494         AC_SUBST(DEBUG_CFLAGS)
 495         AC_SUBST(DEBUG_SPL)
 496         AC_MSG_RESULT([$enable_debug])
 497 ])
 498
 499 dnl #
 500 dnl # Enabled by default it provides a basic debug log infrastructure.
 501 dnl # Each subsystem registers itself with a name and logs messages
 502 dnl # using predefined types.  If the debug mask it set to allow the
 503 dnl # message type it will be written to the internal log.  The log
 504 dnl # can be dumped to a file by echoing 1 to the 'dump' proc entry,
 505 dnl # after dumping the log it must be decoded using the spl utility.
 506 dnl #
 507 dnl # echo 1 >/proc/sys/kernel/spl/debug/dump
 508 dnl # spl /tmp/spl-log.xxx.yyy /tmp/spl-log.xxx.yyy.txt
 509 dnl #
 510 AC_DEFUN([SPL_AC_DEBUG_LOG], [
 511         AC_ARG_ENABLE([debug-log],
 512                 [AS_HELP_STRING([--enable-debug-log],
 513                 [Enable basic debug logging @<:@default=yes@:>@])],
 514                 [],
 515                 [enable_debug_log=yes])
 516
 517         AS_IF([test "x$enable_debug_log" = xyes],
 518         [
 519                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_LOG"
 520                 DEBUG_LOG="_with_debug_log"
 521                 AC_DEFINE([DEBUG_LOG], [1],
 522                 [Define to 1 to enable basic debug logging])
 523         ], [
 524                 DEBUG_LOG="_without_debug_log"
 525         ])
 526
 527         AC_SUBST(DEBUG_LOG)
 528         AC_MSG_CHECKING([whether basic debug logging is enabled])
 529         AC_MSG_RESULT([$enable_debug_log])
 530 ])
 531
 532 dnl #
 533 dnl # Enabled by default it provides a minimal level of memory tracking.
 534 dnl # A total count of bytes allocated is kept for each alloc and free.
 535 dnl # Then at module unload time a report to the console will be printed
 536 dnl # if memory was leaked.  Additionally, /proc/spl/kmem/slab will exist
 537 dnl # and provide an easy way to inspect the kmem based slab.
 538 dnl #
 539 AC_DEFUN([SPL_AC_DEBUG_KMEM], [
 540         AC_ARG_ENABLE([debug-kmem],
 541                 [AS_HELP_STRING([--enable-debug-kmem],
 542                 [Enable basic kmem accounting @<:@default=yes@:>@])],
 543                 [],
 544                 [enable_debug_kmem=yes])
 545
 546         AS_IF([test "x$enable_debug_kmem" = xyes],
 547         [
 548                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_KMEM"
 549                 DEBUG_KMEM="_with_debug_kmem"
 550                 AC_DEFINE([DEBUG_KMEM], [1],
 551                 [Define to 1 to enable basic kmem accounting])
 552         ], [
 553                 DEBUG_KMEM="_without_debug_kmem"
 554         ])
 555
 556         AC_SUBST(DEBUG_KMEM)
 557         AC_MSG_CHECKING([whether basic kmem accounting is enabled])
 558         AC_MSG_RESULT([$enable_debug_kmem])
 559 ])
 560
 561 dnl #
 562 dnl # Disabled by default it provides detailed memory tracking.  This
 563 dnl # feature also requires --enable-debug-kmem to be set.  When enabled
 564 dnl # not only will total bytes be tracked but also the location of every
 565 dnl # alloc and free.  When the SPL module is unloaded a list of all leaked
 566 dnl # addresses and where they were allocated will be dumped to the console.
 567 dnl # Enabling this feature has a significant impact on performance but it
 568 dnl # makes finding memory leaks pretty straight forward.
 569 dnl #
 570 AC_DEFUN([SPL_AC_DEBUG_KMEM_TRACKING], [
 571         AC_ARG_ENABLE([debug-kmem-tracking],
 572                 [AS_HELP_STRING([--enable-debug-kmem-tracking],
 573                 [Enable detailed kmem tracking  @<:@default=no@:>@])],
 574                 [],
 575                 [enable_debug_kmem_tracking=no])
 576
 577         AS_IF([test "x$enable_debug_kmem_tracking" = xyes],
 578         [
 579                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_KMEM_TRACKING"
 580                 DEBUG_KMEM_TRACKING="_with_debug_kmem_tracking"
 581                 AC_DEFINE([DEBUG_KMEM_TRACKING], [1],
 582                 [Define to 1 to enable detailed kmem tracking])
 583         ], [
 584                 DEBUG_KMEM_TRACKING="_without_debug_kmem_tracking"
 585         ])
 586
 587         AC_SUBST(DEBUG_KMEM_TRACKING)
 588         AC_MSG_CHECKING([whether detailed kmem tracking is enabled])
 589         AC_MSG_RESULT([$enable_debug_kmem_tracking])
 590 ])
 591
 592 dnl #
 593 dnl # SPL_LINUX_CONFTEST
 594 dnl #
 595 AC_DEFUN([SPL_LINUX_CONFTEST], [
 596 cat confdefs.h - <<_ACEOF >conftest.c
 597 $1
 598 _ACEOF
 599 ])
 600
 601 dnl #
 602 dnl # SPL_LANG_PROGRAM(C)([PROLOGUE], [BODY])
 603 dnl #
 604 m4_define([SPL_LANG_PROGRAM], [
 605 $1
 606 int
 607 main (void)
 608 {
 609 dnl Do *not* indent the following line: there may be CPP directives.
 610 dnl Don't move the `;' right after for the same reason.
 611 $2
 612   ;
 613   return 0;
 614 }
 615 ])
 616
 617 dnl #
 618 dnl # SPL_LINUX_COMPILE_IFELSE / like AC_COMPILE_IFELSE
 619 dnl #
 620 AC_DEFUN([SPL_LINUX_COMPILE_IFELSE], [
 621         m4_ifvaln([$1], [SPL_LINUX_CONFTEST([$1])])
 622         rm -Rf build && mkdir -p build
 623         echo "obj-m := conftest.o" >build/Makefile
 624         AS_IF(
 625                 [AC_TRY_COMMAND(cp conftest.c build && make [$2] -C $LINUX_OBJ EXTRA_CFLAGS="-Werror-implicit-function-declaration $EXTRA_KCFLAGS" $ARCH_UM M=$PWD/build) >/dev/null && AC_TRY_COMMAND([$3])],
 626                 [$4],
 627                 [_AC_MSG_LOG_CONFTEST m4_ifvaln([$5],[$5])]
 628         )
 629         rm -Rf build
 630 ])
 631
 632 dnl #
 633 dnl # SPL_LINUX_TRY_COMPILE like AC_TRY_COMPILE
 634 dnl #
 635 AC_DEFUN([SPL_LINUX_TRY_COMPILE],
 636         [SPL_LINUX_COMPILE_IFELSE(
 637         [AC_LANG_SOURCE([SPL_LANG_PROGRAM([[$1]], [[$2]])])],
 638         [modules],
 639         [test -s build/conftest.o],
 640         [$3], [$4])
 641 ])
 642
 643 dnl #
 644 dnl # SPL_LINUX_CONFIG
 645 dnl #
 646 AC_DEFUN([SPL_LINUX_CONFIG],
 647         [AC_MSG_CHECKING([whether Linux was built with CONFIG_$1])
 648         SPL_LINUX_TRY_COMPILE([
 649                 #include <linux/module.h>
 650         ],[
 651                 #ifndef CONFIG_$1
 652                 #error CONFIG_$1 not #defined
 653                 #endif
 654         ],[
 655                 AC_MSG_RESULT([yes])
 656                 $2
 657         ],[
 658                 AC_MSG_RESULT([no])
 659                 $3
 660         ])
 661 ])
 662
 663 dnl #
 664 dnl # SPL_CHECK_SYMBOL_EXPORT
 665 dnl # check symbol exported or not
 666 dnl #
 667 AC_DEFUN([SPL_CHECK_SYMBOL_EXPORT],
 668         [AC_MSG_CHECKING([whether symbol $1 is exported])
 669         grep -q -E '[[[:space:]]]$1[[[:space:]]]' \
 670                 $LINUX_OBJ/Module*.symvers 2>/dev/null
 671         rc=$?
 672         if test $rc -ne 0; then
 673                 export=0
 674                 for file in $2; do
 675                         grep -q -E "EXPORT_SYMBOL.*($1)" \
 676                                 "$LINUX_OBJ/$file" 2>/dev/null
 677                         rc=$?
 678                         if test $rc -eq 0; then
 679                                 export=1
 680                                 break;
 681                         fi
 682                 done
 683                 if test $export -eq 0; then
 684                         AC_MSG_RESULT([no])
 685                         $4
 686                 else
 687                         AC_MSG_RESULT([yes])
 688                         $3
 689                 fi
 690         else
 691                 AC_MSG_RESULT([yes])
 692                 $3
 693         fi
 694 ])
 695
 696 dnl #
 697 dnl # SPL_CHECK_SYMBOL_HEADER
 698 dnl # check if a symbol prototype is defined in listed headers.
 699 dnl #
 700 AC_DEFUN([SPL_CHECK_SYMBOL_HEADER], [
 701         AC_MSG_CHECKING([whether symbol $1 exists in header])
 702         header=0
 703         for file in $3; do
 704                 grep -q "$2" "$LINUX/$file" 2>/dev/null
 705                 rc=$?
 706                 if test $rc -eq 0; then
 707                         header=1
 708                         break;
 709                 fi
 710         done
 711         if test $header -eq 0; then
 712                 AC_MSG_RESULT([no])
 713                 $5
 714         else
 715                 AC_MSG_RESULT([yes])
 716                 $4
 717         fi
 718 ])
 719
 720 dnl #
 721 dnl # SPL_CHECK_HEADER
 722 dnl # check whether header exists and define HAVE_$2_HEADER
 723 dnl #
 724 AC_DEFUN([SPL_CHECK_HEADER],
 725         [AC_MSG_CHECKING([whether header $1 exists])
 726         SPL_LINUX_TRY_COMPILE([
 727                 #include <$1>
 728         ],[
 729                 return 0;
 730         ],[
 731                 AC_DEFINE(HAVE_$2_HEADER, 1, [$1 exists])
 732                 AC_MSG_RESULT(yes)
 733                 $3
 734         ],[
 735                 AC_MSG_RESULT(no)
 736                 $4
 737         ])
 738 ])
 739
 740 dnl #
 741 dnl # Use the atomic implemenation based on global spinlocks.  This
 742 dnl # should only be needed by 32-bit kernels which do not provide
 743 dnl # the atomic64_* API.  It may be optionally enabled as a fallback
 744 dnl # if problems are observed with the direct mapping to the native
 745 dnl # Linux atomic operations.  You may not disable atomic spinlocks
 746 dnl # if you kernel does not an atomic64_* API.
 747 dnl #
 748 AC_DEFUN([SPL_AC_ATOMIC_SPINLOCK], [
 749         AC_ARG_ENABLE([atomic-spinlocks],
 750                 [AS_HELP_STRING([--enable-atomic-spinlocks],
 751                 [Atomic types use spinlocks @<:@default=check@:>@])],
 752                 [],
 753                 [enable_atomic_spinlocks=check])
 754
 755         SPL_LINUX_TRY_COMPILE([
 756                 #include <asm/atomic.h>
 757         ],[
 758                 atomic64_t *ptr __attribute__ ((unused));
 759         ],[
 760                 have_atomic64_t=yes
 761                 AC_DEFINE(HAVE_ATOMIC64_T, 1,
 762                         [kernel defines atomic64_t])
 763         ],[
 764                 have_atomic64_t=no
 765         ])
 766
 767         AS_IF([test "x$enable_atomic_spinlocks" = xcheck], [
 768                 AS_IF([test "x$have_atomic64_t" = xyes], [
 769                         enable_atomic_spinlocks=no
 770                 ],[
 771                         enable_atomic_spinlocks=yes
 772                 ])
 773         ])
 774
 775         AS_IF([test "x$enable_atomic_spinlocks" = xyes], [
 776                 AC_DEFINE([ATOMIC_SPINLOCK], [1],
 777                         [Atomic types use spinlocks])
 778         ],[
 779                 AS_IF([test "x$have_atomic64_t" = xno], [
 780                         AC_MSG_FAILURE(
 781                         [--disable-atomic-spinlocks given but required atomic64 support is unavailable])
 782                 ])
 783         ])
 784
 785         AC_MSG_CHECKING([whether atomic types use spinlocks])
 786         AC_MSG_RESULT([$enable_atomic_spinlocks])
 787
 788         AC_MSG_CHECKING([whether kernel defines atomic64_t])
 789         AC_MSG_RESULT([$have_atomic64_t])
 790 ])
 791
 792 dnl #
 793 dnl # 2.6.24 API change,
 794 dnl # check if atomic64_cmpxchg is defined
 795 dnl #
 796 AC_DEFUN([SPL_AC_TYPE_ATOMIC64_CMPXCHG],
 797         [AC_MSG_CHECKING([whether kernel defines atomic64_cmpxchg])
 798         SPL_LINUX_TRY_COMPILE([
 799                 #include <asm/atomic.h>
 800                 #include <asm/system.h>
 801         ],[
 802                 atomic64_cmpxchg((atomic64_t *)NULL, 0, 0);
 803         ],[
 804                 AC_MSG_RESULT([yes])
 805                 AC_DEFINE(HAVE_ATOMIC64_CMPXCHG, 1,
 806                           [kernel defines atomic64_cmpxchg])
 807         ],[
 808                 AC_MSG_RESULT([no])
 809         ])
 810 ])
 811
 812 dnl #
 813 dnl # 2.6.24 API change,
 814 dnl # check if atomic64_xchg is defined
 815 dnl #
 816 AC_DEFUN([SPL_AC_TYPE_ATOMIC64_XCHG],
 817         [AC_MSG_CHECKING([whether kernel defines atomic64_xchg])
 818         SPL_LINUX_TRY_COMPILE([
 819                 #include <asm/atomic.h>
 820         ],[
 821                 atomic64_xchg((atomic64_t *)NULL, 0);
 822         ],[
 823                 AC_MSG_RESULT([yes])
 824                 AC_DEFINE(HAVE_ATOMIC64_XCHG, 1,
 825                           [kernel defines atomic64_xchg])
 826         ],[
 827                 AC_MSG_RESULT([no])
 828         ])
 829 ])
 830
 831 dnl #
 832 dnl # 2.6.24 API change,
 833 dnl # check if uintptr_t typedef is defined
 834 dnl #
 835 AC_DEFUN([SPL_AC_TYPE_UINTPTR_T],
 836         [AC_MSG_CHECKING([whether kernel defines uintptr_t])
 837         SPL_LINUX_TRY_COMPILE([
 838                 #include <linux/types.h>
 839         ],[
 840                 uintptr_t *ptr __attribute__ ((unused));
 841         ],[
 842                 AC_MSG_RESULT([yes])
 843                 AC_DEFINE(HAVE_UINTPTR_T, 1,
 844                           [kernel defines uintptr_t])
 845         ],[
 846                 AC_MSG_RESULT([no])
 847         ])
 848 ])
 849
 850 dnl #
 851 dnl # 2.6.20 API change,
 852 dnl # INIT_WORK use 2 args and not store data inside
 853 dnl #
 854 AC_DEFUN([SPL_AC_3ARGS_INIT_WORK],
 855         [AC_MSG_CHECKING([whether INIT_WORK wants 3 args])
 856         SPL_LINUX_TRY_COMPILE([
 857                 #include <linux/workqueue.h>
 858         ],[
 859                 struct work_struct work __attribute__ ((unused));
 860                 INIT_WORK(&work, NULL, NULL);
 861         ],[
 862                 AC_MSG_RESULT(yes)
 863                 AC_DEFINE(HAVE_3ARGS_INIT_WORK, 1,
 864                           [INIT_WORK wants 3 args])
 865         ],[
 866                 AC_MSG_RESULT(no)
 867         ])
 868 ])
 869
 870 dnl #
 871 dnl # 2.6.21 API change,
 872 dnl # 'register_sysctl_table' use only one argument instead of two
 873 dnl #
 874 AC_DEFUN([SPL_AC_2ARGS_REGISTER_SYSCTL],
 875         [AC_MSG_CHECKING([whether register_sysctl_table() wants 2 args])
 876         SPL_LINUX_TRY_COMPILE([
 877                 #include <linux/sysctl.h>
 878         ],[
 879                 (void) register_sysctl_table(NULL, 0);
 880         ],[
 881                 AC_MSG_RESULT(yes)
 882                 AC_DEFINE(HAVE_2ARGS_REGISTER_SYSCTL, 1,
 883                           [register_sysctl_table() wants 2 args])
 884         ],[
 885                 AC_MSG_RESULT(no)
 886         ])
 887 ])
 888
 889 dnl #
 890 dnl # 2.6.23 API change
 891 dnl # Old set_shrinker API replaced with register_shrinker
 892 dnl #
 893 AC_DEFUN([SPL_AC_SET_SHRINKER], [
 894         AC_MSG_CHECKING([whether set_shrinker() available])
 895         SPL_LINUX_TRY_COMPILE([
 896                 #include <linux/mm.h>
 897         ],[
 898                 return set_shrinker(DEFAULT_SEEKS, NULL);
 899         ],[
 900                 AC_MSG_RESULT([yes])
 901                 AC_DEFINE(HAVE_SET_SHRINKER, 1,
 902                           [set_shrinker() available])
 903         ],[
 904                 AC_MSG_RESULT([no])
 905         ])
 906 ])
 907
 908 dnl #
 909 dnl # 2.6.35 API change,
 910 dnl # Add context to shrinker callback
 911 dnl #
 912 AC_DEFUN([SPL_AC_3ARGS_SHRINKER_CALLBACK],
 913         [AC_MSG_CHECKING([whether shrinker callback wants 3 args])
 914         tmp_flags="$EXTRA_KCFLAGS"
 915         EXTRA_KCFLAGS="-Werror"
 916         SPL_LINUX_TRY_COMPILE([
 917                 #include <linux/mm.h>
 918
 919                 int shrinker_cb(struct shrinker *, int, unsigned int);
 920         ],[
 921                 struct shrinker cache_shrinker = {
 922                         .shrink = shrinker_cb,
 923                         .seeks = DEFAULT_SEEKS,
 924                 };
 925                 register_shrinker(&cache_shrinker);
 926         ],[
 927                 AC_MSG_RESULT(yes)
 928                 AC_DEFINE(HAVE_3ARGS_SHRINKER_CALLBACK, 1,
 929                           [shrinker callback wants 3 args])
 930         ],[
 931                 AC_MSG_RESULT(no)
 932         ])
 933         EXTRA_KCFLAGS="$tmp_flags"
 934 ])
 935
 936 dnl #
 937 dnl # 2.6.25 API change,
 938 dnl # struct path entry added to struct nameidata
 939 dnl #
 940 AC_DEFUN([SPL_AC_PATH_IN_NAMEIDATA],
 941         [AC_MSG_CHECKING([whether struct path used in struct nameidata])
 942         SPL_LINUX_TRY_COMPILE([
 943                 #include <linux/namei.h>
 944         ],[
 945                 struct nameidata nd __attribute__ ((unused));
 946
 947                 nd.path.mnt = NULL;
 948                 nd.path.dentry = NULL;
 949         ],[
 950                 AC_MSG_RESULT(yes)
 951                 AC_DEFINE(HAVE_PATH_IN_NAMEIDATA, 1,
 952                           [struct path used in struct nameidata])
 953         ],[
 954                 AC_MSG_RESULT(no)
 955         ])
 956 ])
 957
 958 dnl #
 959 dnl # Custom SPL patch may export this system it is not required
 960 dnl #
 961 AC_DEFUN([SPL_AC_TASK_CURR], [
 962         SPL_CHECK_SYMBOL_EXPORT([task_curr], [kernel/sched.c],
 963                 [AC_DEFINE(HAVE_TASK_CURR, 1, [task_curr() exported])],
 964                 [])
 965 ])
 966
 967 dnl #
 968 dnl # 2.6.19 API change,
 969 dnl # Use CTL_UNNUMBERED when binary sysctl is not required
 970 dnl #
 971 AC_DEFUN([SPL_AC_CTL_UNNUMBERED],
 972         [AC_MSG_CHECKING([whether unnumbered sysctl support exists])
 973         SPL_LINUX_TRY_COMPILE([
 974                 #include <linux/sysctl.h>
 975         ],[
 976                 #ifndef CTL_UNNUMBERED
 977                 #error CTL_UNNUMBERED undefined
 978                 #endif
 979         ],[
 980                 AC_MSG_RESULT(yes)
 981                 AC_DEFINE(HAVE_CTL_UNNUMBERED, 1,
 982                           [unnumbered sysctl support exists])
 983         ],[
 984                 AC_MSG_RESULT(no)
 985         ])
 986 ])
 987
 988 dnl #
 989 dnl # 2.6.33 API change,
 990 dnl # Removed .ctl_name from struct ctl_table.
 991 dnl #
 992 AC_DEFUN([SPL_AC_CTL_NAME], [
 993         AC_MSG_CHECKING([whether struct ctl_table has ctl_name])
 994         SPL_LINUX_TRY_COMPILE([
 995                 #include <linux/sysctl.h>
 996         ],[
 997                 struct ctl_table ctl __attribute__ ((unused));
 998                 ctl.ctl_name = 0;
 999         ],[
1000                 AC_MSG_RESULT(yes)
1001                 AC_DEFINE(HAVE_CTL_NAME, 1, [struct ctl_table has ctl_name])
1002         ],[
1003                 AC_MSG_RESULT(no)
1004         ])
1005 ])
1006
1007 dnl #
1008 dnl # 2.6.16 API change.
1009 dnl # Check if 'fls64()' is available
1010 dnl #
1011 AC_DEFUN([SPL_AC_FLS64],
1012         [AC_MSG_CHECKING([whether fls64() is available])
1013         SPL_LINUX_TRY_COMPILE([
1014                 #include <linux/bitops.h>
1015         ],[
1016                 return fls64(0);
1017         ],[
1018                 AC_MSG_RESULT(yes)
1019                 AC_DEFINE(HAVE_FLS64, 1, [fls64() is available])
1020         ],[
1021                 AC_MSG_RESULT(no)
1022         ])
1023 ])
1024
1025 dnl #
1026 dnl # 2.6.18 API change, check whether device_create() is available.
1027 dnl # Device_create() was introduced in 2.6.18 and depricated
1028 dnl # class_device_create() which was fully removed in 2.6.26.
1029 dnl #
1030 AC_DEFUN([SPL_AC_DEVICE_CREATE], [
1031         SPL_CHECK_SYMBOL_EXPORT(
1032                 [device_create],
1033                 [drivers/base/core.c],
1034                 [AC_DEFINE(HAVE_DEVICE_CREATE, 1,
1035                 [device_create() is available])],
1036                 [])
1037 ])
1038
1039 dnl #
1040 dnl # 2.6.27 API change,
1041 dnl # device_create() uses 5 args, new 'drvdata' argument.
1042 dnl #
1043 AC_DEFUN([SPL_AC_5ARGS_DEVICE_CREATE], [
1044         AC_MSG_CHECKING([whether device_create() wants 5 args])
1045         tmp_flags="$EXTRA_KCFLAGS"
1046         EXTRA_KCFLAGS="-Werror"
1047         SPL_LINUX_TRY_COMPILE([
1048                 #include <linux/device.h>
1049         ],[
1050                 device_create(NULL, NULL, 0, NULL, "%d", 1);
1051         ],[
1052                 AC_MSG_RESULT(yes)
1053                 AC_DEFINE(HAVE_5ARGS_DEVICE_CREATE, 1,
1054                           [device_create wants 5 args])
1055         ],[
1056                 AC_MSG_RESULT(no)
1057         ])
1058         EXTRA_KCFLAGS="$tmp_flags"
1059 ])
1060
1061 dnl #
1062 dnl # 2.6.13 API change, check whether class_device_create() is available.
1063 dnl # Class_device_create() was introduced in 2.6.13 and depricated
1064 dnl # class_simple_device_add() which was fully removed in 2.6.13.
1065 dnl #
1066 AC_DEFUN([SPL_AC_CLASS_DEVICE_CREATE], [
1067         SPL_CHECK_SYMBOL_EXPORT(
1068                 [class_device_create],
1069                 [drivers/base/class.c],
1070                 [AC_DEFINE(HAVE_CLASS_DEVICE_CREATE, 1,
1071                 [class_device_create() is available])],
1072                 [])
1073 ])
1074
1075 dnl #
1076 dnl # 2.6.26 API change, set_normalized_timespec() is exported.
1077 dnl #
1078 AC_DEFUN([SPL_AC_SET_NORMALIZED_TIMESPEC_EXPORT], [
1079         SPL_CHECK_SYMBOL_EXPORT(
1080                 [set_normalized_timespec],
1081                 [kernel/time.c],
1082                 [AC_DEFINE(HAVE_SET_NORMALIZED_TIMESPEC_EXPORT, 1,
1083                 [set_normalized_timespec() is available as export])],
1084                 [])
1085 ])
1086
1087 dnl #
1088 dnl # 2.6.16 API change, set_normalize_timespec() moved to time.c
1089 dnl # previously it was available in time.h as an inline.
1090 dnl #
1091 AC_DEFUN([SPL_AC_SET_NORMALIZED_TIMESPEC_INLINE], [
1092         AC_MSG_CHECKING([whether set_normalized_timespec() is an inline])
1093         SPL_LINUX_TRY_COMPILE([
1094                 #include <linux/time.h>
1095                 void set_normalized_timespec(struct timespec *ts,
1096                                              time_t sec, long nsec) { }
1097         ],
1098         [],
1099         [
1100                 AC_MSG_RESULT(no)
1101         ],[
1102                 AC_MSG_RESULT(yes)
1103                 AC_DEFINE(HAVE_SET_NORMALIZED_TIMESPEC_INLINE, 1,
1104                           [set_normalized_timespec() is available as inline])
1105         ])
1106 ])
1107
1108 dnl #
1109 dnl # 2.6.18 API change,
1110 dnl # timespec_sub() inline function available in linux/time.h
1111 dnl #
1112 AC_DEFUN([SPL_AC_TIMESPEC_SUB], [
1113         AC_MSG_CHECKING([whether timespec_sub() is available])
1114         SPL_LINUX_TRY_COMPILE([
1115                 #include <linux/time.h>
1116         ],[
1117                 struct timespec a = { 0 };
1118                 struct timespec b = { 0 };
1119                 struct timespec c __attribute__ ((unused));
1120                 c = timespec_sub(a, b);
1121         ],[
1122                 AC_MSG_RESULT(yes)
1123                 AC_DEFINE(HAVE_TIMESPEC_SUB, 1, [timespec_sub() is available])
1124         ],[
1125                 AC_MSG_RESULT(no)
1126         ])
1127 ])
1128
1129 dnl #
1130 dnl # 2.6.19 API change,
1131 dnl # check if init_utsname() is available in linux/utsname.h
1132 dnl #
1133 AC_DEFUN([SPL_AC_INIT_UTSNAME], [
1134         AC_MSG_CHECKING([whether init_utsname() is available])
1135         SPL_LINUX_TRY_COMPILE([
1136                 #include <linux/utsname.h>
1137         ],[
1138                 struct new_utsname *a __attribute__ ((unused));
1139                 a = init_utsname();
1140         ],[
1141                 AC_MSG_RESULT(yes)
1142                 AC_DEFINE(HAVE_INIT_UTSNAME, 1, [init_utsname() is available])
1143         ],[
1144                 AC_MSG_RESULT(no)
1145         ])
1146 ])
1147
1148 dnl #
1149 dnl # 2.6.26 API change,
1150 dnl # definition of struct fdtable relocated to linux/fdtable.h
1151 dnl #
1152 AC_DEFUN([SPL_AC_FDTABLE_HEADER], [
1153         SPL_CHECK_HEADER([linux/fdtable.h], [FDTABLE], [], [])
1154 ])
1155
1156 dnl #
1157 dnl # 2.6.14 API change,
1158 dnl # check whether 'files_fdtable()' exists
1159 dnl #
1160 AC_DEFUN([SPL_AC_FILES_FDTABLE], [
1161         AC_MSG_CHECKING([whether files_fdtable() is available])
1162         SPL_LINUX_TRY_COMPILE([
1163                 #include <linux/sched.h>
1164                 #include <linux/file.h>
1165                 #ifdef HAVE_FDTABLE_HEADER
1166                 #include <linux/fdtable.h>
1167                 #endif
1168         ],[
1169                 struct files_struct *files = current->files;
1170                 struct fdtable *fdt __attribute__ ((unused));
1171                 fdt = files_fdtable(files);
1172         ],[
1173                 AC_MSG_RESULT(yes)
1174                 AC_DEFINE(HAVE_FILES_FDTABLE, 1, [files_fdtable() is available])
1175         ],[
1176                 AC_MSG_RESULT(no)
1177         ])
1178 ])
1179
1180 dnl #
1181 dnl # 3.4.0 API change,
1182 dnl # check whether '__clear_close_on_exec()' exists
1183 dnl #
1184 AC_DEFUN([SPL_AC_CLEAR_CLOSE_ON_EXEC], [
1185         AC_MSG_CHECKING([whether __clear_close_on_exec() is available])
1186         SPL_LINUX_TRY_COMPILE([
1187                 #include <linux/fdtable.h>
1188         ],[
1189                 struct fdtable *fdt = NULL;
1190                 int fd = 0;
1191
1192                 __clear_close_on_exec(fd, fdt);
1193         ],[
1194                 AC_MSG_RESULT(yes)
1195                 AC_DEFINE(HAVE_CLEAR_CLOSE_ON_EXEC, 1,
1196                           [__clear_close_on_exec() is available])
1197         ],[
1198                 AC_MSG_RESULT(no)
1199         ])
1200 ])
1201
1202 dnl #
1203 dnl # 2.6.18 API change,
1204 dnl # added linux/uaccess.h
1205 dnl #
1206 AC_DEFUN([SPL_AC_UACCESS_HEADER], [
1207         SPL_CHECK_HEADER([linux/uaccess.h], [UACCESS], [], [])
1208 ])
1209
1210 dnl #
1211 dnl # 2.6.12 API change,
1212 dnl # check whether 'kmalloc_node()' is available.
1213 dnl #
1214 AC_DEFUN([SPL_AC_KMALLOC_NODE], [
1215         AC_MSG_CHECKING([whether kmalloc_node() is available])
1216         SPL_LINUX_TRY_COMPILE([
1217                 #include <linux/slab.h>
1218         ],[
1219                 void *a __attribute__ ((unused));
1220                 a = kmalloc_node(1, GFP_KERNEL, 0);
1221         ],[
1222                 AC_MSG_RESULT(yes)
1223                 AC_DEFINE(HAVE_KMALLOC_NODE, 1, [kmalloc_node() is available])
1224         ],[
1225                 AC_MSG_RESULT(no)
1226         ])
1227 ])
1228
1229 dnl #
1230 dnl # 2.6.9 API change,
1231 dnl # check whether 'monotonic_clock()' is available it may
1232 dnl # be available for some archs but not others.
1233 dnl #
1234 AC_DEFUN([SPL_AC_MONOTONIC_CLOCK], [
1235         SPL_CHECK_SYMBOL_EXPORT(
1236                 [monotonic_clock],
1237                 [],
1238                 [AC_DEFINE(HAVE_MONOTONIC_CLOCK, 1,
1239                 [monotonic_clock() is available])],
1240                 [])
1241 ])
1242
1243 dnl #
1244 dnl # 2.6.16 API change,
1245 dnl # check whether 'struct inode' has i_mutex
1246 dnl #
1247 AC_DEFUN([SPL_AC_INODE_I_MUTEX], [
1248         AC_MSG_CHECKING([whether struct inode has i_mutex])
1249         SPL_LINUX_TRY_COMPILE([
1250                 #include <linux/fs.h>
1251                 #include <linux/mutex.h>
1252         ],[
1253                 struct inode i;
1254                 mutex_init(&i.i_mutex);
1255         ],[
1256                 AC_MSG_RESULT(yes)
1257                 AC_DEFINE(HAVE_INODE_I_MUTEX, 1, [struct inode has i_mutex])
1258         ],[
1259                 AC_MSG_RESULT(no)
1260         ])
1261 ])
1262
1263 dnl #
1264 dnl # 2.6.29 API change,
1265 dnl # Adaptive mutexs introduced.
1266 dnl #
1267 AC_DEFUN([SPL_AC_MUTEX_OWNER], [
1268         AC_MSG_CHECKING([whether struct mutex has owner])
1269         SPL_LINUX_TRY_COMPILE([
1270                 #include <linux/mutex.h>
1271         ],[
1272                 struct mutex mtx __attribute__ ((unused));
1273                 mtx.owner = NULL;
1274         ],[
1275                 AC_MSG_RESULT(yes)
1276                 AC_DEFINE(HAVE_MUTEX_OWNER, 1, [struct mutex has owner])
1277         ],[
1278                 AC_MSG_RESULT(no)
1279         ])
1280 ])
1281
1282 dnl #
1283 dnl # 2.6.39 API change,
1284 dnl # Owner type change.  A Linux mutex prior to 2.6.39 would store
1285 dnl # the owner as a thread_info pointer when CONFIG_DEBUG_MUTEXES
1286 dnl # was defined.  As of 2.6.39 this was changed to a task_struct
1287 dnl # pointer which frankly makes a lot more sense.
1288 dnl #
1289 AC_DEFUN([SPL_AC_MUTEX_OWNER_TASK_STRUCT], [
1290         AC_MSG_CHECKING([whether struct mutex owner is a task_struct])
1291         tmp_flags="$EXTRA_KCFLAGS"
1292         EXTRA_KCFLAGS="-Werror"
1293         SPL_LINUX_TRY_COMPILE([
1294                 #include <linux/mutex.h>
1295         ],[
1296                 struct mutex mtx __attribute__ ((unused));
1297                 mtx.owner = current;
1298         ],[
1299                 AC_MSG_RESULT(yes)
1300                 AC_DEFINE(HAVE_MUTEX_OWNER_TASK_STRUCT, 1,
1301                 [struct mutex owner is a task_struct])
1302         ],[
1303                 AC_MSG_RESULT(no)
1304         ])
1305         EXTRA_KCFLAGS="$tmp_flags"
1306 ])
1307
1308 dnl #
1309 dnl # 2.6.18 API change,
1310 dnl # First introduced 'mutex_lock_nested()' in include/linux/mutex.h,
1311 dnl # as part of the mutex validator.  Fallback to using 'mutex_lock()'
1312 dnl # if the mutex validator is disabled or otherwise unavailable.
1313 dnl #
1314 AC_DEFUN([SPL_AC_MUTEX_LOCK_NESTED], [
1315         AC_MSG_CHECKING([whether mutex_lock_nested() is available])
1316         SPL_LINUX_TRY_COMPILE([
1317                 #include <linux/mutex.h>
1318         ],[
1319                 struct mutex mutex;
1320                 mutex_init(&mutex);
1321                 mutex_lock_nested(&mutex, 0);
1322         ],[
1323                 AC_MSG_RESULT(yes)
1324                 AC_DEFINE(HAVE_MUTEX_LOCK_NESTED, 1,
1325                 [mutex_lock_nested() is available])
1326         ],[
1327                 AC_MSG_RESULT(no)
1328         ])
1329 ])
1330
1331 dnl #
1332 dnl # 2.6.27 API change,
1333 dnl # on_each_cpu() uses 3 args, no 'retry' argument
1334 dnl #
1335 AC_DEFUN([SPL_AC_3ARGS_ON_EACH_CPU], [
1336         AC_MSG_CHECKING([whether on_each_cpu() wants 3 args])
1337         SPL_LINUX_TRY_COMPILE([
1338                 #include <linux/smp.h>
1339         ],[
1340                 on_each_cpu(NULL, NULL, 0);
1341         ],[
1342                 AC_MSG_RESULT(yes)
1343                 AC_DEFINE(HAVE_3ARGS_ON_EACH_CPU, 1,
1344                           [on_each_cpu wants 3 args])
1345         ],[
1346                 AC_MSG_RESULT(no)
1347         ])
1348 ])
1349
1350 dnl #
1351 dnl # 2.6.18 API change,
1352 dnl # kallsyms_lookup_name no longer exported
1353 dnl #
1354 AC_DEFUN([SPL_AC_KALLSYMS_LOOKUP_NAME], [
1355         SPL_CHECK_SYMBOL_EXPORT(
1356                 [kallsyms_lookup_name],
1357                 [],
1358                 [AC_DEFINE(HAVE_KALLSYMS_LOOKUP_NAME, 1,
1359                 [kallsyms_lookup_name() is available])],
1360                 [])
1361 ])
1362
1363 dnl #
1364 dnl # Proposed API change,
1365 dnl # This symbol is not available in stock kernels.  You may build a
1366 dnl # custom kernel with the *-spl-export-symbols.patch which will export
1367 dnl # these symbols for use.  If your already rolling a custom kernel for
1368 dnl # your environment this is recommended.
1369 dnl #
1370 AC_DEFUN([SPL_AC_GET_VMALLOC_INFO], [
1371         SPL_CHECK_SYMBOL_EXPORT(
1372                 [get_vmalloc_info],
1373                 [],
1374                 [AC_DEFINE(HAVE_GET_VMALLOC_INFO, 1,
1375                 [get_vmalloc_info() is available])],
1376                 [])
1377 ])
1378
1379 dnl #
1380 dnl # 2.6.17 API change
1381 dnl # The helper functions first_online_pgdat(), next_online_pgdat(), and
1382 dnl # next_zone() are introduced to simplify for_each_zone().  These symbols
1383 dnl # were exported in 2.6.17 for use by modules which was consistent with
1384 dnl # the previous implementation of for_each_zone().  From 2.6.18 - 2.6.19
1385 dnl # the symbols were exported as 'unused', and by 2.6.20 they exports
1386 dnl # were dropped entirely leaving modules no way to directly iterate over
1387 dnl # the zone list.  Because we need access to the zone helpers we check
1388 dnl # if the kernel contains the old or new implementation.  Then we check
1389 dnl # to see if the symbols we need for each version are available.  If they
1390 dnl # are not, dynamically aquire the addresses with kallsyms_lookup_name().
1391 dnl #
1392 AC_DEFUN([SPL_AC_PGDAT_HELPERS], [
1393         AC_MSG_CHECKING([whether symbol *_pgdat exist])
1394         grep -q -E 'first_online_pgdat' $LINUX/include/linux/mmzone.h 2>/dev/null
1395         rc=$?
1396         if test $rc -eq 0; then
1397                 AC_MSG_RESULT([yes])
1398                 AC_DEFINE(HAVE_PGDAT_HELPERS, 1, [pgdat helpers are available])
1399         else
1400                 AC_MSG_RESULT([no])
1401         fi
1402 ])
1403
1404 dnl #
1405 dnl # Proposed API change,
1406 dnl # This symbol is not available in stock kernels.  You may build a
1407 dnl # custom kernel with the *-spl-export-symbols.patch which will export
1408 dnl # these symbols for use.  If your already rolling a custom kernel for
1409 dnl # your environment this is recommended.
1410 dnl #
1411 AC_DEFUN([SPL_AC_FIRST_ONLINE_PGDAT], [
1412         SPL_CHECK_SYMBOL_EXPORT(
1413                 [first_online_pgdat],
1414                 [],
1415                 [AC_DEFINE(HAVE_FIRST_ONLINE_PGDAT, 1,
1416                 [first_online_pgdat() is available])],
1417                 [])
1418 ])
1419
1420 dnl #
1421 dnl # Proposed API change,
1422 dnl # This symbol is not available in stock kernels.  You may build a
1423 dnl # custom kernel with the *-spl-export-symbols.patch which will export
1424 dnl # these symbols for use.  If your already rolling a custom kernel for
1425 dnl # your environment this is recommended.
1426 dnl #
1427 AC_DEFUN([SPL_AC_NEXT_ONLINE_PGDAT], [
1428         SPL_CHECK_SYMBOL_EXPORT(
1429                 [next_online_pgdat],
1430                 [],
1431                 [AC_DEFINE(HAVE_NEXT_ONLINE_PGDAT, 1,
1432                 [next_online_pgdat() is available])],
1433                 [])
1434 ])
1435
1436 dnl #
1437 dnl # Proposed API change,
1438 dnl # This symbol is not available in stock kernels.  You may build a
1439 dnl # custom kernel with the *-spl-export-symbols.patch which will export
1440 dnl # these symbols for use.  If your already rolling a custom kernel for
1441 dnl # your environment this is recommended.
1442 dnl #
1443 AC_DEFUN([SPL_AC_NEXT_ZONE], [
1444         SPL_CHECK_SYMBOL_EXPORT(
1445                 [next_zone],
1446                 [],
1447                 [AC_DEFINE(HAVE_NEXT_ZONE, 1,
1448                 [next_zone() is available])],
1449                 [])
1450 ])
1451
1452 dnl #
1453 dnl # 2.6.17 API change,
1454 dnl # See SPL_AC_PGDAT_HELPERS for details.
1455 dnl #
1456 AC_DEFUN([SPL_AC_PGDAT_LIST], [
1457         SPL_CHECK_SYMBOL_EXPORT(
1458                 [pgdat_list],
1459                 [],
1460                 [AC_DEFINE(HAVE_PGDAT_LIST, 1,
1461                 [pgdat_list is available])],
1462                 [])
1463 ])
1464
1465 dnl #
1466 dnl # 2.6.18 API change,
1467 dnl # First introduced global_page_state() support as an inline.
1468 dnl #
1469 AC_DEFUN([SPL_AC_GLOBAL_PAGE_STATE], [
1470         AC_MSG_CHECKING([whether global_page_state() is available])
1471         SPL_LINUX_TRY_COMPILE([
1472                 #include <linux/mm.h>
1473         ],[
1474                 unsigned long state __attribute__ ((unused));
1475                 state = global_page_state(0);
1476         ],[
1477                 AC_MSG_RESULT(yes)
1478                 AC_DEFINE(HAVE_GLOBAL_PAGE_STATE, 1,
1479                           [global_page_state() is available])
1480         ],[
1481                 AC_MSG_RESULT(no)
1482         ])
1483 ])
1484
1485 dnl #
1486 dnl # 2.6.21 API change (plus subsequent naming convention changes),
1487 dnl # Public global zone stats now include a free page count.  However
1488 dnl # the enumerated names of the counters have changed since this API
1489 dnl # was introduced.  We need to deduce the corrent name to use.  This
1490 dnl # replaces the priviate get_zone_counts() interface.
1491 dnl #
1492 dnl # NR_FREE_PAGES was available from 2.6.21 to current kernels, which
1493 dnl # is 2.6.30 as of when this was written.
1494 dnl #
1495 AC_DEFUN([SPL_AC_ZONE_STAT_ITEM_FREE], [
1496         AC_MSG_CHECKING([whether page state NR_FREE_PAGES is available])
1497         SPL_LINUX_TRY_COMPILE([
1498                 #include <linux/mm.h>
1499         ],[
1500                 enum zone_stat_item zsi __attribute__ ((unused));
1501                 zsi = NR_FREE_PAGES;
1502         ],[
1503                 AC_MSG_RESULT(yes)
1504                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_FREE_PAGES, 1,
1505                           [Page state NR_FREE_PAGES is available])
1506         ],[
1507                 AC_MSG_RESULT(no)
1508         ])
1509 ])
1510
1511 dnl #
1512 dnl # 2.6.21 API change (plus subsequent naming convention changes),
1513 dnl # Public global zone stats now include an inactive page count.  However
1514 dnl # the enumerated names of the counters have changed since this API
1515 dnl # was introduced.  We need to deduce the corrent name to use.  This
1516 dnl # replaces the priviate get_zone_counts() interface.
1517 dnl #
1518 dnl # NR_INACTIVE was available from 2.6.21 to 2.6.27 and included both
1519 dnl # anonymous and file inactive pages.  As of 2.6.28 it was split in
1520 dnl # to NR_INACTIVE_ANON and NR_INACTIVE_FILE.
1521 dnl #
1522 AC_DEFUN([SPL_AC_ZONE_STAT_ITEM_INACTIVE], [
1523         AC_MSG_CHECKING([whether page state NR_INACTIVE is available])
1524         SPL_LINUX_TRY_COMPILE([
1525                 #include <linux/mm.h>
1526         ],[
1527                 enum zone_stat_item zsi __attribute__ ((unused));
1528                 zsi = NR_INACTIVE;
1529         ],[
1530                 AC_MSG_RESULT(yes)
1531                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_INACTIVE, 1,
1532                           [Page state NR_INACTIVE is available])
1533         ],[
1534                 AC_MSG_RESULT(no)
1535         ])
1536
1537         AC_MSG_CHECKING([whether page state NR_INACTIVE_ANON is available])
1538         SPL_LINUX_TRY_COMPILE([
1539                 #include <linux/mm.h>
1540         ],[
1541                 enum zone_stat_item zsi __attribute__ ((unused));
1542                 zsi = NR_INACTIVE_ANON;
1543         ],[
1544                 AC_MSG_RESULT(yes)
1545                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_ANON, 1,
1546                           [Page state NR_INACTIVE_ANON is available])
1547         ],[
1548                 AC_MSG_RESULT(no)
1549         ])
1550
1551         AC_MSG_CHECKING([whether page state NR_INACTIVE_FILE is available])
1552         SPL_LINUX_TRY_COMPILE([
1553                 #include <linux/mm.h>
1554         ],[
1555                 enum zone_stat_item zsi __attribute__ ((unused));
1556                 zsi = NR_INACTIVE_FILE;
1557         ],[
1558                 AC_MSG_RESULT(yes)
1559                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_FILE, 1,
1560                           [Page state NR_INACTIVE_FILE is available])
1561         ],[
1562                 AC_MSG_RESULT(no)
1563         ])
1564 ])
1565
1566 dnl #
1567 dnl # 2.6.21 API change (plus subsequent naming convention changes),
1568 dnl # Public global zone stats now include an active page count.  However
1569 dnl # the enumerated names of the counters have changed since this API
1570 dnl # was introduced.  We need to deduce the corrent name to use.  This
1571 dnl # replaces the priviate get_zone_counts() interface.
1572 dnl #
1573 dnl # NR_ACTIVE was available from 2.6.21 to 2.6.27 and included both
1574 dnl # anonymous and file active pages.  As of 2.6.28 it was split in
1575 dnl # to NR_ACTIVE_ANON and NR_ACTIVE_FILE.
1576 dnl #
1577 AC_DEFUN([SPL_AC_ZONE_STAT_ITEM_ACTIVE], [
1578         AC_MSG_CHECKING([whether page state NR_ACTIVE is available])
1579         SPL_LINUX_TRY_COMPILE([
1580                 #include <linux/mm.h>
1581         ],[
1582                 enum zone_stat_item zsi __attribute__ ((unused));
1583                 zsi = NR_ACTIVE;
1584         ],[
1585                 AC_MSG_RESULT(yes)
1586                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_ACTIVE, 1,
1587                           [Page state NR_ACTIVE is available])
1588         ],[
1589                 AC_MSG_RESULT(no)
1590         ])
1591
1592         AC_MSG_CHECKING([whether page state NR_ACTIVE_ANON is available])
1593         SPL_LINUX_TRY_COMPILE([
1594                 #include <linux/mm.h>
1595         ],[
1596                 enum zone_stat_item zsi __attribute__ ((unused));
1597                 zsi = NR_ACTIVE_ANON;
1598         ],[
1599                 AC_MSG_RESULT(yes)
1600                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_ANON, 1,
1601                           [Page state NR_ACTIVE_ANON is available])
1602         ],[
1603                 AC_MSG_RESULT(no)
1604         ])
1605
1606         AC_MSG_CHECKING([whether page state NR_ACTIVE_FILE is available])
1607         SPL_LINUX_TRY_COMPILE([
1608                 #include <linux/mm.h>
1609         ],[
1610                 enum zone_stat_item zsi __attribute__ ((unused));
1611                 zsi = NR_ACTIVE_FILE;
1612         ],[
1613                 AC_MSG_RESULT(yes)
1614                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_FILE, 1,
1615                           [Page state NR_ACTIVE_FILE is available])
1616         ],[
1617                 AC_MSG_RESULT(no)
1618         ])
1619 ])
1620
1621 dnl #
1622 dnl # Proposed API change for legacy kernels.
1623 dnl # This symbol is not available in older kernels.  For kernels post
1624 dnl # 2.6.21 the global_page_state() API is used to get free/inactive/active
1625 dnl # page state information.  This symbol is only used in legacy kernels
1626 dnl # any only as a last resort.
1627 dnl
1628 AC_DEFUN([SPL_AC_GET_ZONE_COUNTS], [
1629         AC_MSG_CHECKING([whether symbol get_zone_counts is needed])
1630         SPL_LINUX_TRY_COMPILE([
1631         ],[
1632                 #if !defined(HAVE_ZONE_STAT_ITEM_NR_FREE_PAGES)
1633                 #error "global_page_state needs NR_FREE_PAGES"
1634                 #endif
1635
1636                 #if !defined(HAVE_ZONE_STAT_ITEM_NR_ACTIVE) && \
1637                     !defined(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_ANON) && \
1638                     !defined(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_FILE)
1639                 #error "global_page_state needs NR_ACTIVE*"
1640                 #endif
1641
1642                 #if !defined(HAVE_ZONE_STAT_ITEM_NR_INACTIVE) && \
1643                     !defined(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_ANON) && \
1644                     !defined(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_FILE)
1645                 #error "global_page_state needs NR_INACTIVE*"
1646                 #endif
1647         ],[
1648                 AC_MSG_RESULT(no)
1649         ],[
1650                 AC_MSG_RESULT(yes)
1651                 AC_DEFINE(NEED_GET_ZONE_COUNTS, 1,
1652                           [get_zone_counts() is needed])
1653
1654                 SPL_CHECK_SYMBOL_EXPORT(
1655                         [get_zone_counts],
1656                         [],
1657                         [AC_DEFINE(HAVE_GET_ZONE_COUNTS, 1,
1658                         [get_zone_counts() is available])],
1659                         [])
1660         ])
1661 ])
1662
1663 dnl #
1664 dnl # 2.6.27 API change,
1665 dnl # The user_path_dir() replaces __user_walk()
1666 dnl #
1667 AC_DEFUN([SPL_AC_USER_PATH_DIR], [
1668         SPL_CHECK_SYMBOL_EXPORT(
1669                 [user_path_at],
1670                 [],
1671                 [AC_DEFINE(HAVE_USER_PATH_DIR, 1,
1672                 [user_path_dir() is available])],
1673                 [])
1674 ])
1675
1676 dnl #
1677 dnl # Symbol available in RHEL kernels not in stock kernels.
1678 dnl #
1679 AC_DEFUN([SPL_AC_SET_FS_PWD], [
1680         SPL_CHECK_SYMBOL_EXPORT(
1681                 [set_fs_pwd],
1682                 [],
1683                 [AC_DEFINE(HAVE_SET_FS_PWD, 1,
1684                 [set_fs_pwd() is available])],
1685                 [])
1686 ])
1687
1688 dnl #
1689 dnl # 2.6.25 API change,
1690 dnl # Simplied API by replacing mnt+dentry args with a single path arg.
1691 dnl #
1692 AC_DEFUN([SPL_AC_2ARGS_SET_FS_PWD],
1693         [AC_MSG_CHECKING([whether set_fs_pwd() wants 2 args])
1694         SPL_LINUX_TRY_COMPILE([
1695                 #include <linux/sched.h>
1696                 #include <linux/fs_struct.h>
1697         ],[
1698                 set_fs_pwd(NULL, NULL);
1699         ],[
1700                 AC_MSG_RESULT(yes)
1701                 AC_DEFINE(HAVE_2ARGS_SET_FS_PWD, 1,
1702                           [set_fs_pwd() wants 2 args])
1703         ],[
1704                 AC_MSG_RESULT(no)
1705         ])
1706 ])
1707
1708 dnl #
1709 dnl # SLES API change, never adopted in mainline,
1710 dnl # Third 'struct vfsmount *' argument removed.
1711 dnl #
1712 AC_DEFUN([SPL_AC_2ARGS_VFS_UNLINK],
1713         [AC_MSG_CHECKING([whether vfs_unlink() wants 2 args])
1714         SPL_LINUX_TRY_COMPILE([
1715                 #include <linux/fs.h>
1716         ],[
1717                 vfs_unlink(NULL, NULL);
1718         ],[
1719                 AC_MSG_RESULT(yes)
1720                 AC_DEFINE(HAVE_2ARGS_VFS_UNLINK, 1,
1721                           [vfs_unlink() wants 2 args])
1722         ],[
1723                 AC_MSG_RESULT(no)
1724         ])
1725 ])
1726
1727 dnl #
1728 dnl # SLES API change, never adopted in mainline,
1729 dnl # Third and sixth 'struct vfsmount *' argument removed.
1730 dnl #
1731 AC_DEFUN([SPL_AC_4ARGS_VFS_RENAME],
1732         [AC_MSG_CHECKING([whether vfs_rename() wants 4 args])
1733         SPL_LINUX_TRY_COMPILE([
1734                 #include <linux/fs.h>
1735         ],[
1736                 vfs_rename(NULL, NULL, NULL, NULL);
1737         ],[
1738                 AC_MSG_RESULT(yes)
1739                 AC_DEFINE(HAVE_4ARGS_VFS_RENAME, 1,
1740                           [vfs_rename() wants 4 args])
1741         ],[
1742                 AC_MSG_RESULT(no)
1743         ])
1744 ])
1745
1746 dnl #
1747 dnl # 2.6.36 API change,
1748 dnl # The 'struct fs_struct->lock' was changed from a rwlock_t to
1749 dnl # a spinlock_t to improve the fastpath performance.
1750 dnl #
1751 AC_DEFUN([SPL_AC_FS_STRUCT_SPINLOCK], [
1752         AC_MSG_CHECKING([whether struct fs_struct uses spinlock_t])
1753         tmp_flags="$EXTRA_KCFLAGS"
1754         EXTRA_KCFLAGS="-Werror"
1755         SPL_LINUX_TRY_COMPILE([
1756                 #include <linux/sched.h>
1757                 #include <linux/fs_struct.h>
1758         ],[
1759                 struct fs_struct fs;
1760                 spin_lock_init(&fs.lock);
1761         ],[
1762                 AC_MSG_RESULT(yes)
1763                 AC_DEFINE(HAVE_FS_STRUCT_SPINLOCK, 1,
1764                           [struct fs_struct uses spinlock_t])
1765         ],[
1766                 AC_MSG_RESULT(no)
1767         ])
1768         EXTRA_KCFLAGS="$tmp_flags"
1769 ])
1770
1771 dnl #
1772 dnl # 2.6.29 API change,
1773 dnl # check whether 'struct cred' exists
1774 dnl #
1775 AC_DEFUN([SPL_AC_CRED_STRUCT], [
1776         AC_MSG_CHECKING([whether struct cred exists])
1777         SPL_LINUX_TRY_COMPILE([
1778                 #include <linux/cred.h>
1779         ],[
1780                 struct cred *cr __attribute__ ((unused));
1781                 cr  = NULL;
1782         ],[
1783                 AC_MSG_RESULT(yes)
1784                 AC_DEFINE(HAVE_CRED_STRUCT, 1, [struct cred exists])
1785         ],[
1786                 AC_MSG_RESULT(no)
1787         ])
1788 ])
1789
1790 dnl #
1791 dnl # Custom SPL patch may export this symbol.
1792 dnl #
1793 AC_DEFUN([SPL_AC_GROUPS_SEARCH], [
1794         SPL_CHECK_SYMBOL_EXPORT(
1795                 [groups_search],
1796                 [],
1797                 [AC_DEFINE(HAVE_GROUPS_SEARCH, 1,
1798                 [groups_search() is available])],
1799                 [])
1800 ])
1801
1802 dnl #
1803 dnl # 2.6.x API change,
1804 dnl # __put_task_struct() was exported in RHEL5 but unavailable elsewhere.
1805 dnl #
1806 AC_DEFUN([SPL_AC_PUT_TASK_STRUCT], [
1807         SPL_CHECK_SYMBOL_EXPORT(
1808                 [__put_task_struct],
1809                 [],
1810                 [AC_DEFINE(HAVE_PUT_TASK_STRUCT, 1,
1811                 [__put_task_struct() is available])],
1812                 [])
1813 ])
1814
1815 dnl #
1816 dnl # 2.6.32 API change,
1817 dnl # Unused 'struct file *' removed from prototype.
1818 dnl #
1819 AC_DEFUN([SPL_AC_5ARGS_PROC_HANDLER], [
1820         AC_MSG_CHECKING([whether proc_handler() wants 5 args])
1821         SPL_LINUX_TRY_COMPILE([
1822                 #include <linux/sysctl.h>
1823         ],[
1824                 proc_dostring(NULL, 0, NULL, NULL, NULL);
1825         ],[
1826                 AC_MSG_RESULT(yes)
1827                 AC_DEFINE(HAVE_5ARGS_PROC_HANDLER, 1,
1828                           [proc_handler() wants 5 args])
1829         ],[
1830                 AC_MSG_RESULT(no)
1831         ])
1832 ])
1833
1834 dnl #
1835 dnl # 2.6.x API change,
1836 dnl # kvasprintf() function added.
1837 dnl #
1838 AC_DEFUN([SPL_AC_KVASPRINTF], [
1839         SPL_CHECK_SYMBOL_EXPORT(
1840                 [kvasprintf],
1841                 [],
1842                 [AC_DEFINE(HAVE_KVASPRINTF, 1,
1843                 [kvasprintf() is available])],
1844                 [])
1845 ])
1846
1847 dnl #
1848 dnl # 2.6.29 API change,
1849 dnl # vfs_fsync() funcation added, prior to this use file_fsync().
1850 dnl #
1851 AC_DEFUN([SPL_AC_VFS_FSYNC], [
1852         SPL_CHECK_SYMBOL_EXPORT(
1853                 [vfs_fsync],
1854                 [fs/sync.c],
1855                 [AC_DEFINE(HAVE_VFS_FSYNC, 1, [vfs_fsync() is available])],
1856                 [])
1857 ])
1858
1859 dnl #
1860 dnl # 2.6.35 API change,
1861 dnl # Unused 'struct dentry *' removed from vfs_fsync() prototype.
1862 dnl #
1863 AC_DEFUN([SPL_AC_2ARGS_VFS_FSYNC], [
1864         AC_MSG_CHECKING([whether vfs_fsync() wants 2 args])
1865         SPL_LINUX_TRY_COMPILE([
1866                 #include <linux/fs.h>
1867         ],[
1868                 vfs_fsync(NULL, 0);
1869         ],[
1870                 AC_MSG_RESULT(yes)
1871                 AC_DEFINE(HAVE_2ARGS_VFS_FSYNC, 1, [vfs_fsync() wants 2 args])
1872         ],[
1873                 AC_MSG_RESULT(no)
1874         ])
1875 ])
1876
1877 dnl #
1878 dnl # 2.6.33 API change. Also backported in RHEL5 as of 2.6.18-190.el5.
1879 dnl # Earlier versions of rwsem_is_locked() were inline and had a race
1880 dnl # condition.  The fixed version is exported as a symbol.  The race
1881 dnl # condition is fixed by acquiring sem->wait_lock, so we must not
1882 dnl # call that version while holding sem->wait_lock.
1883 dnl #
1884 AC_DEFUN([SPL_AC_EXPORTED_RWSEM_IS_LOCKED], [
1885         SPL_CHECK_SYMBOL_EXPORT(
1886                 [rwsem_is_locked],
1887                 [lib/rwsem-spinlock.c],
1888                 [AC_DEFINE(RWSEM_IS_LOCKED_TAKES_WAIT_LOCK, 1,
1889                 [rwsem_is_locked() acquires sem->wait_lock])],
1890                 [])
1891 ])
1892
1893 dnl #
1894 dnl # 2.6.37 API compat,
1895 dnl # The function invalidate_inodes() is no longer exported by the kernel.
1896 dnl # The prototype however is still available which means it is safe
1897 dnl # to acquire the symbol's address using spl_kallsyms_lookup_name().
1898 dnl #
1899 dnl # The Proxmox VE kernel contains a patch which renames the function
1900 dnl # invalidate_inodes() to invalidate_inodes_check().  In the process
1901 dnl # it adds a 'check' argument and a '#define invalidate_inodes(x)'
1902 dnl # compatibility wrapper for legacy callers.  Therefore, if either
1903 dnl # of these functions are exported invalidate_inodes() can be
1904 dnl # safely used.
1905 dnl #
1906 AC_DEFUN([SPL_AC_KERNEL_INVALIDATE_INODES], [
1907         SPL_CHECK_SYMBOL_EXPORT(
1908                 [invalidate_inodes],
1909                 [],
1910                 [AC_DEFINE(HAVE_INVALIDATE_INODES, 1,
1911                 [invalidate_inodes() is available])],
1912                 [])
1913         SPL_CHECK_SYMBOL_EXPORT(
1914                 [invalidate_inodes_check],
1915                 [],
1916                 [AC_DEFINE(HAVE_INVALIDATE_INODES_CHECK, 1,
1917                 [invalidate_inodes_check() is available])],
1918                 [])
1919 ])
1920
1921 dnl #
1922 dnl # 2.6.39 API compat,
1923 dnl # The function invalidate_inodes() now take 2 arguments.  The second
1924 dnl # 'kill_dirty' argument describes how invalidate_inodes() should
1925 dnl # handle dirty inodes.  Only when set will dirty inodes be discarded,
1926 dnl # otherwise they will be handled as busy.
1927 dnl #
1928 dnl # Unfortunately, we don't have access to the invalidate_inodes()
1929 dnl # prototype so it's not easy to check how many arguments it takes.
1930 dnl # However, this change was done for the benefit of invalidate_device()
1931 dnl # which also added an argument.  The invalidate_device() symbol does
1932 dnl # exist in the development headers so if it takes two arguments we
1933 dnl # can fairly safely infer that invalidate_inodes() takes two arguments
1934 dnl # as well.  See commit 93b270f76e7ef3b81001576860c2701931cdc78b.
1935 dnl #
1936 AC_DEFUN([SPL_AC_KERNEL_2ARGS_INVALIDATE_INODES],
1937         [AC_MSG_CHECKING([whether invalidate_inodes() wants 2 args])
1938         SPL_LINUX_TRY_COMPILE([
1939                 #include <linux/fs.h>
1940         ],[
1941                 return __invalidate_device(NULL, 0);
1942         ],[
1943                 AC_MSG_RESULT(yes)
1944                 AC_DEFINE(HAVE_2ARGS_INVALIDATE_INODES, 1,
1945                           [invalidate_inodes() wants 2 args])
1946         ],[
1947                 AC_MSG_RESULT(no)
1948         ])
1949 ])
1950
1951 dnl #
1952 dnl # 2.6.xx API compat,
1953 dnl # There currently exists no exposed API to partially shrink the dcache.
1954 dnl # The expected mechanism to shrink the cache is a registered shrinker
1955 dnl # which is called during memory pressure.
1956 dnl #
1957 AC_DEFUN([SPL_AC_SHRINK_DCACHE_MEMORY], [
1958         SPL_CHECK_SYMBOL_EXPORT(
1959                 [shrink_dcache_memory],
1960                 [fs/dcache.c],
1961                 [AC_DEFINE(HAVE_SHRINK_DCACHE_MEMORY, 1,
1962                 [shrink_dcache_memory() is available])],
1963                 [])
1964 ])
1965
1966 dnl #
1967 dnl # 2.6.xx API compat,
1968 dnl # There currently exists no exposed API to partially shrink the icache.
1969 dnl # The expected mechanism to shrink the cache is a registered shrinker
1970 dnl # which is called during memory pressure.
1971 dnl #
1972 AC_DEFUN([SPL_AC_SHRINK_ICACHE_MEMORY], [
1973         SPL_CHECK_SYMBOL_EXPORT(
1974                 [shrink_icache_memory],
1975                 [fs/inode.c],
1976                 [AC_DEFINE(HAVE_SHRINK_ICACHE_MEMORY, 1,
1977                 [shrink_icache_memory() is available])],
1978                 [])
1979 ])
1980
1981 dnl #
1982 dnl # 2.6.39 API compat,
1983 dnl # The path_lookup() function has been renamed to kern_path_parent()
1984 dnl # and the flags argument has been removed.  The only behavior now
1985 dnl # offered is that of LOOKUP_PARENT.  The spl already always passed
1986 dnl # this flag so dropping the flag does not impact us.
1987 dnl #
1988 AC_DEFUN([SPL_AC_KERN_PATH_PARENT_HEADER], [
1989         SPL_CHECK_SYMBOL_HEADER(
1990                 [kern_path_parent],
1991                 [int kern_path_parent(const char \*, struct nameidata \*)],
1992                 [include/linux/namei.h],
1993                 [AC_DEFINE(HAVE_KERN_PATH_PARENT_HEADER, 1,
1994                 [kern_path_parent() is available])],
1995                 [])
1996 ])
1997
1998 dnl #
1999 dnl # 3.1 API compat,
2000 dnl # The kern_path_parent() symbol is no longer exported by the kernel.
2001 dnl # However, it remains the prefered interface and since we still have
2002 dnl # access to the prototype we dynamically lookup the required address.
2003 dnl #
2004 AC_DEFUN([SPL_AC_KERN_PATH_PARENT_SYMBOL], [
2005         SPL_CHECK_SYMBOL_EXPORT(
2006                 [kern_path_parent],
2007                 [fs/namei.c],
2008                 [AC_DEFINE(HAVE_KERN_PATH_PARENT_SYMBOL, 1,
2009                 [kern_path_parent() is available])],
2010                 [])
2011 ])
2012
2013 dnl #
2014 dnl # 2.6.39 API compat,
2015 dnl # The function zlib_deflate_workspacesize() now take 2 arguments.
2016 dnl # This was done to avoid always having to allocate the maximum size
2017 dnl # workspace (268K).  The caller can now specific the windowBits and
2018 dnl # memLevel compression parameters to get a smaller workspace.
2019 dnl #
2020 AC_DEFUN([SPL_AC_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE],
2021         [AC_MSG_CHECKING([whether zlib_deflate_workspacesize() wants 2 args])
2022         SPL_LINUX_TRY_COMPILE([
2023                 #include <linux/zlib.h>
2024         ],[
2025                 return zlib_deflate_workspacesize(MAX_WBITS, MAX_MEM_LEVEL);
2026         ],[
2027                 AC_MSG_RESULT(yes)
2028                 AC_DEFINE(HAVE_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE, 1,
2029                           [zlib_deflate_workspacesize() wants 2 args])
2030         ],[
2031                 AC_MSG_RESULT(no)
2032         ])
2033 ])
2034
2035 dnl #
2036 dnl # 2.6.39 API change,
2037 dnl # Shrinker adjust to use common shrink_control structure.
2038 dnl #
2039 AC_DEFUN([SPL_AC_SHRINK_CONTROL_STRUCT], [
2040         AC_MSG_CHECKING([whether struct shrink_control exists])
2041         SPL_LINUX_TRY_COMPILE([
2042                 #include <linux/mm.h>
2043         ],[
2044                 struct shrink_control sc __attribute__ ((unused));
2045
2046                 sc.nr_to_scan = 0;
2047                 sc.gfp_mask = GFP_KERNEL;
2048         ],[
2049                 AC_MSG_RESULT(yes)
2050                 AC_DEFINE(HAVE_SHRINK_CONTROL_STRUCT, 1,
2051                         [struct shrink_control exists])
2052         ],[
2053                 AC_MSG_RESULT(no)
2054         ])
2055 ])
2056
2057 dnl #
2058 dnl # 3.1 API Change
2059 dnl #
2060 dnl # The rw_semaphore.wait_lock member was changed from spinlock_t to
2061 dnl # raw_spinlock_t at commit ddb6c9b58a19edcfac93ac670b066c836ff729f1.
2062 dnl #
2063 AC_DEFUN([SPL_AC_RWSEM_SPINLOCK_IS_RAW], [
2064         AC_MSG_CHECKING([whether struct rw_semaphore member wait_lock is raw])
2065         tmp_flags="$EXTRA_KCFLAGS"
2066         EXTRA_KCFLAGS="-Werror"
2067         SPL_LINUX_TRY_COMPILE([
2068                 #include <linux/rwsem.h>
2069         ],[
2070                 struct rw_semaphore dummy_semaphore __attribute__ ((unused));
2071                 raw_spinlock_t dummy_lock __attribute__ ((unused));
2072                 dummy_semaphore.wait_lock = dummy_lock;
2073         ],[
2074                 AC_MSG_RESULT(yes)
2075                 AC_DEFINE(RWSEM_SPINLOCK_IS_RAW, 1,
2076                 [struct rw_semaphore member wait_lock is raw_spinlock_t])
2077         ],[
2078                 AC_MSG_RESULT(no)
2079         ])
2080         EXTRA_KCFLAGS="$tmp_flags"
2081 ])