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