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
  12         if test "${LINUX_OBJ}" != "${LINUX}"; then
  13                 KERNELMAKE_PARAMS="$KERNELMAKE_PARAMS O=$LINUX_OBJ"
  14         fi
  15         AC_SUBST(KERNELMAKE_PARAMS)
  16
  17         KERNELCPPFLAGS="$KERNELCPPFLAGS -Wstrict-prototypes"
  18         AC_SUBST(KERNELCPPFLAGS)
  19
  20         SPL_AC_DEBUG
  21         SPL_AC_DEBUG_LOG
  22         SPL_AC_DEBUG_KMEM
  23         SPL_AC_DEBUG_KMEM_TRACKING
  24         SPL_AC_TEST_MODULE
  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_2ARGS_REGISTER_SYSCTL
  30         SPL_AC_SET_SHRINKER
  31         SPL_AC_3ARGS_SHRINKER_CALLBACK
  32         SPL_AC_PATH_IN_NAMEIDATA
  33         SPL_AC_TASK_CURR
  34         SPL_AC_CTL_UNNUMBERED
  35         SPL_AC_CTL_NAME
  36         SPL_AC_FLS64
  37         SPL_AC_DEVICE_CREATE
  38         SPL_AC_5ARGS_DEVICE_CREATE
  39         SPL_AC_CLASS_DEVICE_CREATE
  40         SPL_AC_SET_NORMALIZED_TIMESPEC_EXPORT
  41         SPL_AC_SET_NORMALIZED_TIMESPEC_INLINE
  42         SPL_AC_TIMESPEC_SUB
  43         SPL_AC_INIT_UTSNAME
  44         SPL_AC_UACCESS_HEADER
  45         SPL_AC_KMALLOC_NODE
  46         SPL_AC_MONOTONIC_CLOCK
  47         SPL_AC_INODE_I_MUTEX
  48         SPL_AC_MUTEX_OWNER
  49         SPL_AC_MUTEX_OWNER_TASK_STRUCT
  50         SPL_AC_MUTEX_LOCK_NESTED
  51         SPL_AC_3ARGS_ON_EACH_CPU
  52         SPL_AC_KALLSYMS_LOOKUP_NAME
  53         SPL_AC_GET_VMALLOC_INFO
  54         SPL_AC_PGDAT_HELPERS
  55         SPL_AC_FIRST_ONLINE_PGDAT
  56         SPL_AC_NEXT_ONLINE_PGDAT
  57         SPL_AC_NEXT_ZONE
  58         SPL_AC_PGDAT_LIST
  59         SPL_AC_GLOBAL_PAGE_STATE
  60         SPL_AC_ZONE_STAT_ITEM_FREE
  61         SPL_AC_ZONE_STAT_ITEM_INACTIVE
  62         SPL_AC_ZONE_STAT_ITEM_ACTIVE
  63         SPL_AC_GET_ZONE_COUNTS
  64         SPL_AC_USER_PATH_DIR
  65         SPL_AC_SET_FS_PWD
  66         SPL_AC_2ARGS_SET_FS_PWD
  67         SPL_AC_2ARGS_VFS_UNLINK
  68         SPL_AC_4ARGS_VFS_RENAME
  69         SPL_AC_VFS_FSYNC
  70         SPL_AC_2ARGS_VFS_FSYNC
  71         SPL_AC_INODE_TRUNCATE_RANGE
  72         SPL_AC_FS_STRUCT_SPINLOCK
  73         SPL_AC_CRED_STRUCT
  74         SPL_AC_GROUPS_SEARCH
  75         SPL_AC_PUT_TASK_STRUCT
  76         SPL_AC_5ARGS_PROC_HANDLER
  77         SPL_AC_KVASPRINTF
  78         SPL_AC_EXPORTED_RWSEM_IS_LOCKED
  79         SPL_AC_KERNEL_FALLOCATE
  80         SPL_AC_SHRINK_DCACHE_MEMORY
  81         SPL_AC_SHRINK_ICACHE_MEMORY
  82         SPL_AC_KERN_PATH_PARENT_HEADER
  83         SPL_AC_KERN_PATH_PARENT_SYMBOL
  84         SPL_AC_KERN_PATH_LOCKED
  85         SPL_AC_CONFIG_KALLSYMS
  86         SPL_AC_CONFIG_ZLIB_INFLATE
  87         SPL_AC_CONFIG_ZLIB_DEFLATE
  88         SPL_AC_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE
  89         SPL_AC_SHRINK_CONTROL_STRUCT
  90         SPL_AC_RWSEM_SPINLOCK_IS_RAW
  91         SPL_AC_SCHED_RT_HEADER
  92 ])
  93
  94 AC_DEFUN([SPL_AC_MODULE_SYMVERS], [
  95         modpost=$LINUX/scripts/Makefile.modpost
  96         AC_MSG_CHECKING([kernel file name for module symbols])
  97         if test "x$enable_linux_builtin" != xyes -a -f "$modpost"; then
  98                 if grep -q Modules.symvers $modpost; then
  99                         LINUX_SYMBOLS=Modules.symvers
 100                 else
 101                         LINUX_SYMBOLS=Module.symvers
 102                 fi
 103
 104                 if ! test -f "$LINUX_OBJ/$LINUX_SYMBOLS"; then
 105                         AC_MSG_ERROR([
 106         *** Please make sure the kernel devel package for your distribution
 107         *** is installed.  If your building with a custom kernel make sure the
 108         *** kernel is configured, built, and the '--with-linux=PATH' configure
 109         *** option refers to the location of the kernel source.])
 110                 fi
 111         else
 112                 LINUX_SYMBOLS=NONE
 113         fi
 114         AC_MSG_RESULT($LINUX_SYMBOLS)
 115         AC_SUBST(LINUX_SYMBOLS)
 116 ])
 117
 118 AC_DEFUN([SPL_AC_KERNEL], [
 119         AC_ARG_WITH([linux],
 120                 AS_HELP_STRING([--with-linux=PATH],
 121                 [Path to kernel source]),
 122                 [kernelsrc="$withval"])
 123
 124         AC_ARG_WITH([linux-obj],
 125                 AS_HELP_STRING([--with-linux-obj=PATH],
 126                 [Path to kernel build objects]),
 127                 [kernelbuild="$withval"])
 128
 129         AC_MSG_CHECKING([kernel source directory])
 130         if test -z "$kernelsrc"; then
 131                 if test -e "/lib/modules/$(uname -r)/source"; then
 132                         headersdir="/lib/modules/$(uname -r)/source"
 133                         sourcelink=$(readlink -f "$headersdir")
 134                 elif test -e "/lib/modules/$(uname -r)/build"; then
 135                         headersdir="/lib/modules/$(uname -r)/build"
 136                         sourcelink=$(readlink -f "$headersdir")
 137                 else
 138                         sourcelink=$(ls -1d /usr/src/kernels/* \
 139                                      /usr/src/linux-* \
 140                                      2>/dev/null | grep -v obj | tail -1)
 141                 fi
 142
 143                 if test -n "$sourcelink" && test -e ${sourcelink}; then
 144                         kernelsrc=`readlink -f ${sourcelink}`
 145                 else
 146                         kernelsrc="[Not found]"
 147                 fi
 148         else
 149                 if test "$kernelsrc" = "NONE"; then
 150                         kernsrcver=NONE
 151                 fi
 152         fi
 153
 154         AC_MSG_RESULT([$kernelsrc])
 155         if test ! -d "$kernelsrc"; then
 156                 AC_MSG_ERROR([
 157         *** Please make sure the kernel devel package for your distribution
 158         *** is installed then try again.  If that fails you can specify the
 159         *** location of the kernel source with the '--with-linux=PATH' option.])
 160         fi
 161
 162         AC_MSG_CHECKING([kernel build directory])
 163         if test -z "$kernelbuild"; then
 164                 if test -e "/lib/modules/$(uname -r)/build"; then
 165                         kernelbuild=`readlink -f /lib/modules/$(uname -r)/build`
 166                 elif test -d ${kernelsrc}-obj/${target_cpu}/${target_cpu}; then
 167                         kernelbuild=${kernelsrc}-obj/${target_cpu}/${target_cpu}
 168                 elif test -d ${kernelsrc}-obj/${target_cpu}/default; then
 169                         kernelbuild=${kernelsrc}-obj/${target_cpu}/default
 170                 elif test -d `dirname ${kernelsrc}`/build-${target_cpu}; then
 171                         kernelbuild=`dirname ${kernelsrc}`/build-${target_cpu}
 172                 else
 173                         kernelbuild=${kernelsrc}
 174                 fi
 175         fi
 176         AC_MSG_RESULT([$kernelbuild])
 177
 178         AC_MSG_CHECKING([kernel source version])
 179         utsrelease1=$kernelbuild/include/linux/version.h
 180         utsrelease2=$kernelbuild/include/linux/utsrelease.h
 181         utsrelease3=$kernelbuild/include/generated/utsrelease.h
 182         if test -r $utsrelease1 && fgrep -q UTS_RELEASE $utsrelease1; then
 183                 utsrelease=linux/version.h
 184         elif test -r $utsrelease2 && fgrep -q UTS_RELEASE $utsrelease2; then
 185                 utsrelease=linux/utsrelease.h
 186         elif test -r $utsrelease3 && fgrep -q UTS_RELEASE $utsrelease3; then
 187                 utsrelease=generated/utsrelease.h
 188         fi
 189
 190         if test "$utsrelease"; then
 191                 kernsrcver=`(echo "#include <$utsrelease>";
 192                              echo "kernsrcver=UTS_RELEASE") |
 193                              cpp -I $kernelbuild/include |
 194                              grep "^kernsrcver=" | cut -d \" -f 2`
 195
 196                 if test -z "$kernsrcver"; then
 197                         AC_MSG_RESULT([Not found])
 198                         AC_MSG_ERROR([*** Cannot determine kernel version.])
 199                 fi
 200         else
 201                 AC_MSG_RESULT([Not found])
 202                 if test "x$enable_linux_builtin" != xyes; then
 203                         AC_MSG_ERROR([*** Cannot find UTS_RELEASE definition.])
 204                 else
 205                         AC_MSG_ERROR([
 206         *** Cannot find UTS_RELEASE definition.
 207         *** Please run 'make prepare' inside the kernel source tree.])
 208                 fi
 209         fi
 210
 211         AC_MSG_RESULT([$kernsrcver])
 212
 213         LINUX=${kernelsrc}
 214         LINUX_OBJ=${kernelbuild}
 215         LINUX_VERSION=${kernsrcver}
 216
 217         AC_SUBST(LINUX)
 218         AC_SUBST(LINUX_OBJ)
 219         AC_SUBST(LINUX_VERSION)
 220
 221         SPL_AC_MODULE_SYMVERS
 222 ])
 223
 224 dnl #
 225 dnl # Default SPL user configuration
 226 dnl #
 227 AC_DEFUN([SPL_AC_CONFIG_USER], [])
 228
 229 dnl #
 230 dnl # Check for rpm+rpmbuild to build RPM packages.  If these tools
 231 dnl # are missing it is non-fatal but you will not be able to build
 232 dnl # RPM packages and will be warned if you try too.
 233 dnl #
 234 AC_DEFUN([SPL_AC_RPM], [
 235         RPM=rpm
 236         RPMBUILD=rpmbuild
 237
 238         AC_MSG_CHECKING([whether $RPM is available])
 239         AS_IF([tmp=$($RPM --version 2>/dev/null)], [
 240                 RPM_VERSION=$(echo $tmp | $AWK '/RPM/ { print $[3] }')
 241                 HAVE_RPM=yes
 242                 AC_MSG_RESULT([$HAVE_RPM ($RPM_VERSION)])
 243         ],[
 244                 HAVE_RPM=no
 245                 AC_MSG_RESULT([$HAVE_RPM])
 246         ])
 247
 248         AC_MSG_CHECKING([whether $RPMBUILD is available])
 249         AS_IF([tmp=$($RPMBUILD --version 2>/dev/null)], [
 250                 RPMBUILD_VERSION=$(echo $tmp | $AWK '/RPM/ { print $[3] }')
 251                 HAVE_RPMBUILD=yes
 252                 AC_MSG_RESULT([$HAVE_RPMBUILD ($RPMBUILD_VERSION)])
 253         ],[
 254                 HAVE_RPMBUILD=no
 255                 AC_MSG_RESULT([$HAVE_RPMBUILD])
 256         ])
 257
 258         AC_SUBST(HAVE_RPM)
 259         AC_SUBST(RPM)
 260         AC_SUBST(RPM_VERSION)
 261
 262         AC_SUBST(HAVE_RPMBUILD)
 263         AC_SUBST(RPMBUILD)
 264         AC_SUBST(RPMBUILD_VERSION)
 265 ])
 266
 267 dnl #
 268 dnl # Check for dpkg+dpkg-buildpackage to build DEB packages.  If these
 269 dnl # tools are missing it is non-fatal but you will not be able to build
 270 dnl # DEB packages and will be warned if you try too.
 271 dnl #
 272 AC_DEFUN([SPL_AC_DPKG], [
 273         DPKG=dpkg
 274         DPKGBUILD=dpkg-buildpackage
 275
 276         AC_MSG_CHECKING([whether $DPKG is available])
 277         AS_IF([tmp=$($DPKG --version 2>/dev/null)], [
 278                 DPKG_VERSION=$(echo $tmp | $AWK '/Debian/ { print $[7] }')
 279                 HAVE_DPKG=yes
 280                 AC_MSG_RESULT([$HAVE_DPKG ($DPKG_VERSION)])
 281         ],[
 282                 HAVE_DPKG=no
 283                 AC_MSG_RESULT([$HAVE_DPKG])
 284         ])
 285
 286         AC_MSG_CHECKING([whether $DPKGBUILD is available])
 287         AS_IF([tmp=$($DPKGBUILD --version 2>/dev/null)], [
 288                 DPKGBUILD_VERSION=$(echo $tmp | \
 289                     $AWK '/Debian/ { print $[4] }' | cut -f-4 -d'.')
 290                 HAVE_DPKGBUILD=yes
 291                 AC_MSG_RESULT([$HAVE_DPKGBUILD ($DPKGBUILD_VERSION)])
 292         ],[
 293                 HAVE_DPKGBUILD=no
 294                 AC_MSG_RESULT([$HAVE_DPKGBUILD])
 295         ])
 296
 297         AC_SUBST(HAVE_DPKG)
 298         AC_SUBST(DPKG)
 299         AC_SUBST(DPKG_VERSION)
 300
 301         AC_SUBST(HAVE_DPKGBUILD)
 302         AC_SUBST(DPKGBUILD)
 303         AC_SUBST(DPKGBUILD_VERSION)
 304 ])
 305
 306 dnl #
 307 dnl # Until native packaging for various different packing systems
 308 dnl # can be added the least we can do is attempt to use alien to
 309 dnl # convert the RPM packages to the needed package type.  This is
 310 dnl # a hack but so far it has worked reasonable well.
 311 dnl #
 312 AC_DEFUN([SPL_AC_ALIEN], [
 313         ALIEN=alien
 314
 315         AC_MSG_CHECKING([whether $ALIEN is available])
 316         AS_IF([tmp=$($ALIEN --version 2>/dev/null)], [
 317                 ALIEN_VERSION=$(echo $tmp | $AWK '{ print $[3] }')
 318                 HAVE_ALIEN=yes
 319                 AC_MSG_RESULT([$HAVE_ALIEN ($ALIEN_VERSION)])
 320         ],[
 321                 HAVE_ALIEN=no
 322                 AC_MSG_RESULT([$HAVE_ALIEN])
 323         ])
 324
 325         AC_SUBST(HAVE_ALIEN)
 326         AC_SUBST(ALIEN)
 327         AC_SUBST(ALIEN_VERSION)
 328 ])
 329
 330 dnl #
 331 dnl # Using the VENDOR tag from config.guess set the default
 332 dnl # package type for 'make pkg': (rpm | deb | tgz)
 333 dnl #
 334 AC_DEFUN([SPL_AC_DEFAULT_PACKAGE], [
 335         AC_MSG_CHECKING([linux distribution])
 336         if test -f /etc/toss-release ; then
 337                 VENDOR=toss ;
 338         elif test -f /etc/fedora-release ; then
 339                 VENDOR=fedora ;
 340         elif test -f /etc/redhat-release ; then
 341                 VENDOR=redhat ;
 342         elif test -f /etc/gentoo-release ; then
 343                 VENDOR=gentoo ;
 344         elif test -f /etc/arch-release ; then
 345                 VENDOR=arch ;
 346         elif test -f /etc/SuSE-release ; then
 347                 VENDOR=sles ;
 348         elif test -f /etc/slackware-version ; then
 349                 VENDOR=slackware ;
 350         elif test -f /etc/lunar.release ; then
 351                 VENDOR=lunar ;
 352         elif test -f /etc/lsb-release ; then
 353                 VENDOR=ubuntu ;
 354         elif test -f /etc/debian_version ; then
 355                 VENDOR=debian ;
 356         else
 357                 VENDOR= ;
 358         fi
 359         AC_MSG_RESULT([$VENDOR])
 360         AC_SUBST(VENDOR)
 361
 362         AC_MSG_CHECKING([default package type])
 363         case "$VENDOR" in
 364                 toss)       DEFAULT_PACKAGE=rpm  ;;
 365                 redhat)     DEFAULT_PACKAGE=rpm  ;;
 366                 fedora)     DEFAULT_PACKAGE=rpm  ;;
 367                 gentoo)     DEFAULT_PACKAGE=tgz  ;;
 368                 arch)       DEFAULT_PACKAGE=tgz  ;;
 369                 sles)       DEFAULT_PACKAGE=rpm  ;;
 370                 slackware)  DEFAULT_PACKAGE=tgz  ;;
 371                 lunar)      DEFAULT_PACKAGE=tgz  ;;
 372                 ubuntu)     DEFAULT_PACKAGE=deb  ;;
 373                 debian)     DEFAULT_PACKAGE=deb  ;;
 374                 *)          DEFAULT_PACKAGE=rpm  ;;
 375         esac
 376
 377         AC_MSG_RESULT([$DEFAULT_PACKAGE])
 378         AC_SUBST(DEFAULT_PACKAGE)
 379 ])
 380
 381 dnl #
 382 dnl # Default SPL user configuration
 383 dnl #
 384 AC_DEFUN([SPL_AC_PACKAGE], [
 385         SPL_AC_DEFAULT_PACKAGE
 386         SPL_AC_RPM
 387         SPL_AC_DPKG
 388         SPL_AC_ALIEN
 389 ])
 390
 391 AC_DEFUN([SPL_AC_LICENSE], [
 392         AC_MSG_CHECKING([spl license])
 393         LICENSE=GPL
 394         AC_MSG_RESULT([$LICENSE])
 395         KERNELCPPFLAGS="${KERNELCPPFLAGS} -DHAVE_GPL_ONLY_SYMBOLS"
 396         AC_SUBST(LICENSE)
 397 ])
 398
 399 AC_DEFUN([SPL_AC_CONFIG], [
 400         SPL_CONFIG=all
 401         AC_ARG_WITH([config],
 402                 AS_HELP_STRING([--with-config=CONFIG],
 403                 [Config file 'kernel|user|all|srpm']),
 404                 [SPL_CONFIG="$withval"])
 405         AC_ARG_ENABLE([linux-builtin],
 406                 [AC_HELP_STRING([--enable-linux-builtin],
 407                 [Configure for builtin in-tree kernel modules @<:@default=no@:>@])],
 408                 [],
 409                 [enable_linux_builtin=no])
 410
 411         AC_MSG_CHECKING([spl config])
 412         AC_MSG_RESULT([$SPL_CONFIG]);
 413         AC_SUBST(SPL_CONFIG)
 414
 415         case "$SPL_CONFIG" in
 416                 kernel) SPL_AC_CONFIG_KERNEL ;;
 417                 user)   SPL_AC_CONFIG_USER   ;;
 418                 all)    SPL_AC_CONFIG_KERNEL
 419                         SPL_AC_CONFIG_USER   ;;
 420                 srpm)                        ;;
 421                 *)
 422                 AC_MSG_RESULT([Error!])
 423                 AC_MSG_ERROR([Bad value "$SPL_CONFIG" for --with-config,
 424                              user kernel|user|all|srpm]) ;;
 425         esac
 426
 427         AM_CONDITIONAL([CONFIG_USER],
 428                        [test "$SPL_CONFIG" = user -o "$SPL_CONFIG" = all])
 429         AM_CONDITIONAL([CONFIG_KERNEL],
 430                        [test "$SPL_CONFIG" = kernel -o "$SPL_CONFIG" = all] &&
 431                        [test "x$enable_linux_builtin" != xyes ])
 432 ])
 433
 434 dnl #
 435 dnl # Enable if the SPL should be compiled with internal debugging enabled.
 436 dnl # By default this support is disabled.
 437 dnl #
 438 AC_DEFUN([SPL_AC_DEBUG], [
 439         AC_MSG_CHECKING([whether debugging is enabled])
 440         AC_ARG_ENABLE([debug],
 441                 [AS_HELP_STRING([--enable-debug],
 442                 [Enable generic debug support @<:@default=no@:>@])],
 443                 [],
 444                 [enable_debug=no])
 445
 446         AS_IF([test "x$enable_debug" = xyes],
 447         [
 448                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG -Werror"
 449                 DEBUG_CFLAGS="-DDEBUG -Werror"
 450                 DEBUG_SPL="_with_debug"
 451         ], [
 452                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DNDEBUG"
 453                 DEBUG_CFLAGS="-DNDEBUG"
 454                 DEBUG_SPL="_without_debug"
 455         ])
 456
 457         AC_SUBST(DEBUG_CFLAGS)
 458         AC_SUBST(DEBUG_SPL)
 459         AC_MSG_RESULT([$enable_debug])
 460 ])
 461
 462 dnl #
 463 dnl # Enabled by default it provides a basic debug log infrastructure.
 464 dnl # Each subsystem registers itself with a name and logs messages
 465 dnl # using predefined types.  If the debug mask it set to allow the
 466 dnl # message type it will be written to the internal log.  The log
 467 dnl # can be dumped to a file by echoing 1 to the 'dump' proc entry,
 468 dnl # after dumping the log it must be decoded using the spl utility.
 469 dnl #
 470 dnl # echo 1 >/proc/sys/kernel/spl/debug/dump
 471 dnl # spl /tmp/spl-log.xxx.yyy /tmp/spl-log.xxx.yyy.txt
 472 dnl #
 473 AC_DEFUN([SPL_AC_DEBUG_LOG], [
 474         AC_ARG_ENABLE([debug-log],
 475                 [AS_HELP_STRING([--enable-debug-log],
 476                 [Enable basic debug logging @<:@default=yes@:>@])],
 477                 [],
 478                 [enable_debug_log=yes])
 479
 480         AS_IF([test "x$enable_debug_log" = xyes],
 481         [
 482                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_LOG"
 483                 DEBUG_LOG="_with_debug_log"
 484                 AC_DEFINE([DEBUG_LOG], [1],
 485                 [Define to 1 to enable basic debug logging])
 486         ], [
 487                 DEBUG_LOG="_without_debug_log"
 488         ])
 489
 490         AC_SUBST(DEBUG_LOG)
 491         AC_MSG_CHECKING([whether basic debug logging is enabled])
 492         AC_MSG_RESULT([$enable_debug_log])
 493 ])
 494
 495 dnl #
 496 dnl # Enabled by default it provides a minimal level of memory tracking.
 497 dnl # A total count of bytes allocated is kept for each alloc and free.
 498 dnl # Then at module unload time a report to the console will be printed
 499 dnl # if memory was leaked.  Additionally, /proc/spl/kmem/slab will exist
 500 dnl # and provide an easy way to inspect the kmem based slab.
 501 dnl #
 502 AC_DEFUN([SPL_AC_DEBUG_KMEM], [
 503         AC_ARG_ENABLE([debug-kmem],
 504                 [AS_HELP_STRING([--enable-debug-kmem],
 505                 [Enable basic kmem accounting @<:@default=yes@:>@])],
 506                 [],
 507                 [enable_debug_kmem=yes])
 508
 509         AS_IF([test "x$enable_debug_kmem" = xyes],
 510         [
 511                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_KMEM"
 512                 DEBUG_KMEM="_with_debug_kmem"
 513                 AC_DEFINE([DEBUG_KMEM], [1],
 514                 [Define to 1 to enable basic kmem accounting])
 515         ], [
 516                 DEBUG_KMEM="_without_debug_kmem"
 517         ])
 518
 519         AC_SUBST(DEBUG_KMEM)
 520         AC_MSG_CHECKING([whether basic kmem accounting is enabled])
 521         AC_MSG_RESULT([$enable_debug_kmem])
 522 ])
 523
 524 dnl #
 525 dnl # Disabled by default it provides detailed memory tracking.  This
 526 dnl # feature also requires --enable-debug-kmem to be set.  When enabled
 527 dnl # not only will total bytes be tracked but also the location of every
 528 dnl # alloc and free.  When the SPL module is unloaded a list of all leaked
 529 dnl # addresses and where they were allocated will be dumped to the console.
 530 dnl # Enabling this feature has a significant impact on performance but it
 531 dnl # makes finding memory leaks pretty straight forward.
 532 dnl #
 533 AC_DEFUN([SPL_AC_DEBUG_KMEM_TRACKING], [
 534         AC_ARG_ENABLE([debug-kmem-tracking],
 535                 [AS_HELP_STRING([--enable-debug-kmem-tracking],
 536                 [Enable detailed kmem tracking  @<:@default=no@:>@])],
 537                 [],
 538                 [enable_debug_kmem_tracking=no])
 539
 540         AS_IF([test "x$enable_debug_kmem_tracking" = xyes],
 541         [
 542                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_KMEM_TRACKING"
 543                 DEBUG_KMEM_TRACKING="_with_debug_kmem_tracking"
 544                 AC_DEFINE([DEBUG_KMEM_TRACKING], [1],
 545                 [Define to 1 to enable detailed kmem tracking])
 546         ], [
 547                 DEBUG_KMEM_TRACKING="_without_debug_kmem_tracking"
 548         ])
 549
 550         AC_SUBST(DEBUG_KMEM_TRACKING)
 551         AC_MSG_CHECKING([whether detailed kmem tracking is enabled])
 552         AC_MSG_RESULT([$enable_debug_kmem_tracking])
 553 ])
 554
 555 dnl #
 556 dnl # SPL_LINUX_CONFTEST
 557 dnl #
 558 AC_DEFUN([SPL_LINUX_CONFTEST], [
 559 cat confdefs.h - <<_ACEOF >conftest.c
 560 $1
 561 _ACEOF
 562 ])
 563
 564 dnl #
 565 dnl # SPL_LANG_PROGRAM(C)([PROLOGUE], [BODY])
 566 dnl #
 567 m4_define([SPL_LANG_PROGRAM], [
 568 $1
 569 int
 570 main (void)
 571 {
 572 dnl Do *not* indent the following line: there may be CPP directives.
 573 dnl Don't move the `;' right after for the same reason.
 574 $2
 575   ;
 576   return 0;
 577 }
 578 ])
 579
 580 dnl #
 581 dnl # SPL_LINUX_COMPILE_IFELSE / like AC_COMPILE_IFELSE
 582 dnl #
 583 AC_DEFUN([SPL_LINUX_COMPILE_IFELSE], [
 584         m4_ifvaln([$1], [SPL_LINUX_CONFTEST([$1])])
 585         rm -Rf build && mkdir -p build && touch build/conftest.mod.c
 586         echo "obj-m := conftest.o" >build/Makefile
 587         modpost_flag=''
 588         test "x$enable_linux_builtin" = xyes && modpost_flag='modpost=true' # fake modpost stage
 589         AS_IF(
 590                 [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 $modpost_flag) >/dev/null && AC_TRY_COMMAND([$3])],
 591                 [$4],
 592                 [_AC_MSG_LOG_CONFTEST m4_ifvaln([$5],[$5])]
 593         )
 594         rm -Rf build
 595 ])
 596
 597 dnl #
 598 dnl # SPL_LINUX_TRY_COMPILE like AC_TRY_COMPILE
 599 dnl #
 600 AC_DEFUN([SPL_LINUX_TRY_COMPILE],
 601         [SPL_LINUX_COMPILE_IFELSE(
 602         [AC_LANG_SOURCE([SPL_LANG_PROGRAM([[$1]], [[$2]])])],
 603         [modules],
 604         [test -s build/conftest.o],
 605         [$3], [$4])
 606 ])
 607
 608 dnl #
 609 dnl # SPL_CHECK_SYMBOL_EXPORT
 610 dnl # check symbol exported or not
 611 dnl #
 612 AC_DEFUN([SPL_CHECK_SYMBOL_EXPORT], [
 613         grep -q -E '[[[:space:]]]$1[[[:space:]]]' \
 614                 $LINUX_OBJ/Module*.symvers 2>/dev/null
 615         rc=$?
 616         if test $rc -ne 0; then
 617                 export=0
 618                 for file in $2; do
 619                         grep -q -E "EXPORT_SYMBOL.*($1)" \
 620                                 "$LINUX_OBJ/$file" 2>/dev/null
 621                         rc=$?
 622                         if test $rc -eq 0; then
 623                                 export=1
 624                                 break;
 625                         fi
 626                 done
 627                 if test $export -eq 0; then :
 628                         $4
 629                 else :
 630                         $3
 631                 fi
 632         else :
 633                 $3
 634         fi
 635 ])
 636
 637 dnl #
 638 dnl # SPL_LINUX_TRY_COMPILE_SYMBOL
 639 dnl # like SPL_LINUX_TRY_COMPILE, except SPL_CHECK_SYMBOL_EXPORT
 640 dnl # is called if not compiling for builtin
 641 dnl #
 642 AC_DEFUN([SPL_LINUX_TRY_COMPILE_SYMBOL], [
 643         SPL_LINUX_TRY_COMPILE([$1], [$2], [rc=0], [rc=1])
 644         if test $rc -ne 0; then :
 645                 $6
 646         else
 647                 if test "x$enable_linux_builtin" != xyes; then
 648                         SPL_CHECK_SYMBOL_EXPORT([$3], [$4], [rc=0], [rc=1])
 649                 fi
 650                 if test $rc -ne 0; then :
 651                         $6
 652                 else :
 653                         $5
 654                 fi
 655         fi
 656 ])
 657
 658 dnl #
 659 dnl # SPL_CHECK_SYMBOL_HEADER
 660 dnl # check if a symbol prototype is defined in listed headers.
 661 dnl #
 662 AC_DEFUN([SPL_CHECK_SYMBOL_HEADER], [
 663         AC_MSG_CHECKING([whether symbol $1 exists in header])
 664         header=0
 665         for file in $3; do
 666                 grep -q "$2" "$LINUX/$file" 2>/dev/null
 667                 rc=$?
 668                 if test $rc -eq 0; then
 669                         header=1
 670                         break;
 671                 fi
 672         done
 673         if test $header -eq 0; then
 674                 AC_MSG_RESULT([no])
 675                 $5
 676         else
 677                 AC_MSG_RESULT([yes])
 678                 $4
 679         fi
 680 ])
 681
 682 dnl #
 683 dnl # SPL_CHECK_HEADER
 684 dnl # check whether header exists and define HAVE_$2_HEADER
 685 dnl #
 686 AC_DEFUN([SPL_CHECK_HEADER],
 687         [AC_MSG_CHECKING([whether header $1 exists])
 688         SPL_LINUX_TRY_COMPILE([
 689                 #include <$1>
 690         ],[
 691                 return 0;
 692         ],[
 693                 AC_DEFINE(HAVE_$2_HEADER, 1, [$1 exists])
 694                 AC_MSG_RESULT(yes)
 695                 $3
 696         ],[
 697                 AC_MSG_RESULT(no)
 698                 $4
 699         ])
 700 ])
 701
 702 dnl #
 703 dnl # Basic toolchain sanity check.
 704 dnl #
 705 AC_DEFUN([SPL_AC_TEST_MODULE],
 706         [AC_MSG_CHECKING([whether modules can be built])
 707         SPL_LINUX_TRY_COMPILE([],[],[
 708                 AC_MSG_RESULT([yes])
 709         ],[
 710                 AC_MSG_RESULT([no])
 711                 if test "x$enable_linux_builtin" != xyes; then
 712                         AC_MSG_ERROR([*** Unable to build an empty module.])
 713                 else
 714                         AC_MSG_ERROR([
 715         *** Unable to build an empty module.
 716         *** Please run 'make scripts' inside the kernel source tree.])
 717                 fi
 718         ])
 719 ])
 720
 721 dnl #
 722 dnl # Use the atomic implemenation based on global spinlocks.  This
 723 dnl # should only be needed by 32-bit kernels which do not provide
 724 dnl # the atomic64_* API.  It may be optionally enabled as a fallback
 725 dnl # if problems are observed with the direct mapping to the native
 726 dnl # Linux atomic operations.  You may not disable atomic spinlocks
 727 dnl # if you kernel does not an atomic64_* API.
 728 dnl #
 729 AC_DEFUN([SPL_AC_ATOMIC_SPINLOCK], [
 730         AC_ARG_ENABLE([atomic-spinlocks],
 731                 [AS_HELP_STRING([--enable-atomic-spinlocks],
 732                 [Atomic types use spinlocks @<:@default=check@:>@])],
 733                 [],
 734                 [enable_atomic_spinlocks=check])
 735
 736         SPL_LINUX_TRY_COMPILE([
 737                 #include <linux/fs.h>
 738         ],[
 739                 atomic64_t *ptr __attribute__ ((unused));
 740         ],[
 741                 have_atomic64_t=yes
 742                 AC_DEFINE(HAVE_ATOMIC64_T, 1,
 743                         [kernel defines atomic64_t])
 744         ],[
 745                 have_atomic64_t=no
 746         ])
 747
 748         AS_IF([test "x$enable_atomic_spinlocks" = xcheck], [
 749                 AS_IF([test "x$have_atomic64_t" = xyes], [
 750                         enable_atomic_spinlocks=no
 751                 ],[
 752                         enable_atomic_spinlocks=yes
 753                 ])
 754         ])
 755
 756         AS_IF([test "x$enable_atomic_spinlocks" = xyes], [
 757                 AC_DEFINE([ATOMIC_SPINLOCK], [1],
 758                         [Atomic types use spinlocks])
 759         ],[
 760                 AS_IF([test "x$have_atomic64_t" = xno], [
 761                         AC_MSG_FAILURE(
 762                         [--disable-atomic-spinlocks given but required atomic64 support is unavailable])
 763                 ])
 764         ])
 765
 766         AC_MSG_CHECKING([whether atomic types use spinlocks])
 767         AC_MSG_RESULT([$enable_atomic_spinlocks])
 768
 769         AC_MSG_CHECKING([whether kernel defines atomic64_t])
 770         AC_MSG_RESULT([$have_atomic64_t])
 771 ])
 772
 773 dnl #
 774 dnl # 2.6.24 API change,
 775 dnl # check if atomic64_cmpxchg is defined
 776 dnl #
 777 AC_DEFUN([SPL_AC_TYPE_ATOMIC64_CMPXCHG],
 778         [AC_MSG_CHECKING([whether kernel defines atomic64_cmpxchg])
 779         SPL_LINUX_TRY_COMPILE([
 780                 #include <linux/fs.h>
 781         ],[
 782                 atomic64_cmpxchg((atomic64_t *)NULL, 0, 0);
 783         ],[
 784                 AC_MSG_RESULT([yes])
 785                 AC_DEFINE(HAVE_ATOMIC64_CMPXCHG, 1,
 786                           [kernel defines atomic64_cmpxchg])
 787         ],[
 788                 AC_MSG_RESULT([no])
 789         ])
 790 ])
 791
 792 dnl #
 793 dnl # 2.6.24 API change,
 794 dnl # check if atomic64_xchg is defined
 795 dnl #
 796 AC_DEFUN([SPL_AC_TYPE_ATOMIC64_XCHG],
 797         [AC_MSG_CHECKING([whether kernel defines atomic64_xchg])
 798         SPL_LINUX_TRY_COMPILE([
 799                 #include <linux/fs.h>
 800         ],[
 801                 atomic64_xchg((atomic64_t *)NULL, 0);
 802         ],[
 803                 AC_MSG_RESULT([yes])
 804                 AC_DEFINE(HAVE_ATOMIC64_XCHG, 1,
 805                           [kernel defines atomic64_xchg])
 806         ],[
 807                 AC_MSG_RESULT([no])
 808         ])
 809 ])
 810
 811 dnl #
 812 dnl # 2.6.24 API change,
 813 dnl # check if uintptr_t typedef is defined
 814 dnl #
 815 AC_DEFUN([SPL_AC_TYPE_UINTPTR_T],
 816         [AC_MSG_CHECKING([whether kernel defines uintptr_t])
 817         SPL_LINUX_TRY_COMPILE([
 818                 #include <linux/types.h>
 819         ],[
 820                 uintptr_t *ptr __attribute__ ((unused));
 821         ],[
 822                 AC_MSG_RESULT([yes])
 823                 AC_DEFINE(HAVE_UINTPTR_T, 1,
 824                           [kernel defines uintptr_t])
 825         ],[
 826                 AC_MSG_RESULT([no])
 827         ])
 828 ])
 829
 830 dnl #
 831 dnl # 2.6.21 API change,
 832 dnl # 'register_sysctl_table' use only one argument instead of two
 833 dnl #
 834 AC_DEFUN([SPL_AC_2ARGS_REGISTER_SYSCTL],
 835         [AC_MSG_CHECKING([whether register_sysctl_table() wants 2 args])
 836         SPL_LINUX_TRY_COMPILE([
 837                 #include <linux/sysctl.h>
 838         ],[
 839                 (void) register_sysctl_table(NULL, 0);
 840         ],[
 841                 AC_MSG_RESULT(yes)
 842                 AC_DEFINE(HAVE_2ARGS_REGISTER_SYSCTL, 1,
 843                           [register_sysctl_table() wants 2 args])
 844         ],[
 845                 AC_MSG_RESULT(no)
 846         ])
 847 ])
 848
 849 dnl #
 850 dnl # 2.6.23 API change
 851 dnl # Old set_shrinker API replaced with register_shrinker
 852 dnl #
 853 AC_DEFUN([SPL_AC_SET_SHRINKER], [
 854         AC_MSG_CHECKING([whether set_shrinker() available])
 855         SPL_LINUX_TRY_COMPILE([
 856                 #include <linux/mm.h>
 857         ],[
 858                 return set_shrinker(DEFAULT_SEEKS, NULL);
 859         ],[
 860                 AC_MSG_RESULT([yes])
 861                 AC_DEFINE(HAVE_SET_SHRINKER, 1,
 862                           [set_shrinker() available])
 863         ],[
 864                 AC_MSG_RESULT([no])
 865         ])
 866 ])
 867
 868 dnl #
 869 dnl # 2.6.35 API change,
 870 dnl # Add context to shrinker callback
 871 dnl #
 872 AC_DEFUN([SPL_AC_3ARGS_SHRINKER_CALLBACK],
 873         [AC_MSG_CHECKING([whether shrinker callback wants 3 args])
 874         tmp_flags="$EXTRA_KCFLAGS"
 875         EXTRA_KCFLAGS="-Werror"
 876         SPL_LINUX_TRY_COMPILE([
 877                 #include <linux/mm.h>
 878
 879                 int shrinker_cb(struct shrinker *, int, unsigned int);
 880         ],[
 881                 struct shrinker cache_shrinker = {
 882                         .shrink = shrinker_cb,
 883                         .seeks = DEFAULT_SEEKS,
 884                 };
 885                 register_shrinker(&cache_shrinker);
 886         ],[
 887                 AC_MSG_RESULT(yes)
 888                 AC_DEFINE(HAVE_3ARGS_SHRINKER_CALLBACK, 1,
 889                           [shrinker callback wants 3 args])
 890         ],[
 891                 AC_MSG_RESULT(no)
 892         ])
 893         EXTRA_KCFLAGS="$tmp_flags"
 894 ])
 895
 896 dnl #
 897 dnl # 2.6.25 API change,
 898 dnl # struct path entry added to struct nameidata
 899 dnl #
 900 AC_DEFUN([SPL_AC_PATH_IN_NAMEIDATA],
 901         [AC_MSG_CHECKING([whether struct path used in struct nameidata])
 902         SPL_LINUX_TRY_COMPILE([
 903                 #include <linux/namei.h>
 904         ],[
 905                 struct nameidata nd __attribute__ ((unused));
 906
 907                 nd.path.mnt = NULL;
 908                 nd.path.dentry = NULL;
 909         ],[
 910                 AC_MSG_RESULT(yes)
 911                 AC_DEFINE(HAVE_PATH_IN_NAMEIDATA, 1,
 912                           [struct path used in struct nameidata])
 913         ],[
 914                 AC_MSG_RESULT(no)
 915         ])
 916 ])
 917
 918 dnl #
 919 dnl # Custom SPL patch may export this system it is not required
 920 dnl #
 921 AC_DEFUN([SPL_AC_TASK_CURR],
 922         [AC_MSG_CHECKING([whether task_curr() is available])
 923         SPL_LINUX_TRY_COMPILE_SYMBOL([
 924                 #include <linux/sched.h>
 925         ], [
 926                 task_curr(NULL);
 927         ], [task_curr], [kernel/sched.c], [
 928                 AC_MSG_RESULT(yes)
 929                 AC_DEFINE(HAVE_TASK_CURR, 1, [task_curr() is available])
 930         ], [
 931                 AC_MSG_RESULT(no)
 932         ])
 933 ])
 934
 935 dnl #
 936 dnl # 2.6.19 API change,
 937 dnl # Use CTL_UNNUMBERED when binary sysctl is not required
 938 dnl #
 939 AC_DEFUN([SPL_AC_CTL_UNNUMBERED],
 940         [AC_MSG_CHECKING([whether unnumbered sysctl support exists])
 941         SPL_LINUX_TRY_COMPILE([
 942                 #include <linux/sysctl.h>
 943         ],[
 944                 #ifndef CTL_UNNUMBERED
 945                 #error CTL_UNNUMBERED undefined
 946                 #endif
 947         ],[
 948                 AC_MSG_RESULT(yes)
 949                 AC_DEFINE(HAVE_CTL_UNNUMBERED, 1,
 950                           [unnumbered sysctl support exists])
 951         ],[
 952                 AC_MSG_RESULT(no)
 953         ])
 954 ])
 955
 956 dnl #
 957 dnl # 2.6.33 API change,
 958 dnl # Removed .ctl_name from struct ctl_table.
 959 dnl #
 960 AC_DEFUN([SPL_AC_CTL_NAME], [
 961         AC_MSG_CHECKING([whether struct ctl_table has ctl_name])
 962         SPL_LINUX_TRY_COMPILE([
 963                 #include <linux/sysctl.h>
 964         ],[
 965                 struct ctl_table ctl __attribute__ ((unused));
 966                 ctl.ctl_name = 0;
 967         ],[
 968                 AC_MSG_RESULT(yes)
 969                 AC_DEFINE(HAVE_CTL_NAME, 1, [struct ctl_table has ctl_name])
 970         ],[
 971                 AC_MSG_RESULT(no)
 972         ])
 973 ])
 974
 975 dnl #
 976 dnl # 2.6.16 API change.
 977 dnl # Check if 'fls64()' is available
 978 dnl #
 979 AC_DEFUN([SPL_AC_FLS64],
 980         [AC_MSG_CHECKING([whether fls64() is available])
 981         SPL_LINUX_TRY_COMPILE([
 982                 #include <linux/bitops.h>
 983         ],[
 984                 return fls64(0);
 985         ],[
 986                 AC_MSG_RESULT(yes)
 987                 AC_DEFINE(HAVE_FLS64, 1, [fls64() is available])
 988         ],[
 989                 AC_MSG_RESULT(no)
 990         ])
 991 ])
 992
 993 dnl #
 994 dnl # 2.6.18 API change, check whether device_create() is available.
 995 dnl # Device_create() was introduced in 2.6.18 and depricated
 996 dnl # class_device_create() which was fully removed in 2.6.26.
 997 dnl #
 998 AC_DEFUN([SPL_AC_DEVICE_CREATE],
 999         [AC_MSG_CHECKING([whether device_create() is available])
1000         SPL_CHECK_SYMBOL_EXPORT([device_create], [drivers/base/core.c], [
1001                 AC_MSG_RESULT(yes)
1002                 AC_DEFINE(HAVE_DEVICE_CREATE, 1,
1003                           [device_create() is available])
1004         ], [
1005                 AC_MSG_RESULT(no)
1006         ])
1007 ])
1008
1009 dnl #
1010 dnl # 2.6.27 API change,
1011 dnl # device_create() uses 5 args, new 'drvdata' argument.
1012 dnl #
1013 AC_DEFUN([SPL_AC_5ARGS_DEVICE_CREATE], [
1014         AC_MSG_CHECKING([whether device_create() wants 5 args])
1015         tmp_flags="$EXTRA_KCFLAGS"
1016         EXTRA_KCFLAGS="-Werror"
1017         SPL_LINUX_TRY_COMPILE([
1018                 #include <linux/device.h>
1019         ],[
1020                 device_create(NULL, NULL, 0, NULL, "%d", 1);
1021         ],[
1022                 AC_MSG_RESULT(yes)
1023                 AC_DEFINE(HAVE_5ARGS_DEVICE_CREATE, 1,
1024                           [device_create wants 5 args])
1025         ],[
1026                 AC_MSG_RESULT(no)
1027         ])
1028         EXTRA_KCFLAGS="$tmp_flags"
1029 ])
1030
1031 dnl #
1032 dnl # 2.6.13 API change, check whether class_device_create() is available.
1033 dnl # Class_device_create() was introduced in 2.6.13 and depricated
1034 dnl # class_simple_device_add() which was fully removed in 2.6.13.
1035 dnl #
1036 AC_DEFUN([SPL_AC_CLASS_DEVICE_CREATE],
1037         [AC_MSG_CHECKING([whether class_device_create() is available])
1038         SPL_LINUX_TRY_COMPILE_SYMBOL([
1039                 #include <linux/device.h>
1040         ], [
1041                 class_device_create(NULL, NULL, 0, NULL, NULL);
1042         ], [class_device_create], [drivers/base/class.c], [
1043                 AC_MSG_RESULT(yes)
1044                 AC_DEFINE(HAVE_CLASS_DEVICE_CREATE, 1,
1045                           [class_device_create() is available])
1046         ], [
1047                 AC_MSG_RESULT(no)
1048         ])
1049 ])
1050
1051 dnl #
1052 dnl # 2.6.26 API change, set_normalized_timespec() is exported.
1053 dnl #
1054 AC_DEFUN([SPL_AC_SET_NORMALIZED_TIMESPEC_EXPORT],
1055         [AC_MSG_CHECKING([whether set_normalized_timespec() is available as export])
1056         SPL_LINUX_TRY_COMPILE_SYMBOL([
1057                 #include <linux/time.h>
1058         ], [
1059                 set_normalized_timespec(NULL, 0, 0);
1060         ], [set_normalized_timespec], [kernel/time.c], [
1061                 AC_MSG_RESULT(yes)
1062                 AC_DEFINE(HAVE_SET_NORMALIZED_TIMESPEC_EXPORT, 1,
1063                           [set_normalized_timespec() is available as export])
1064         ], [
1065                 AC_MSG_RESULT(no)
1066         ])
1067 ])
1068
1069 dnl #
1070 dnl # 2.6.16 API change, set_normalize_timespec() moved to time.c
1071 dnl # previously it was available in time.h as an inline.
1072 dnl #
1073 AC_DEFUN([SPL_AC_SET_NORMALIZED_TIMESPEC_INLINE], [
1074         AC_MSG_CHECKING([whether set_normalized_timespec() is an inline])
1075         SPL_LINUX_TRY_COMPILE([
1076                 #include <linux/time.h>
1077                 void set_normalized_timespec(struct timespec *ts,
1078                                              time_t sec, long nsec) { }
1079         ],
1080         [],
1081         [
1082                 AC_MSG_RESULT(no)
1083         ],[
1084                 AC_MSG_RESULT(yes)
1085                 AC_DEFINE(HAVE_SET_NORMALIZED_TIMESPEC_INLINE, 1,
1086                           [set_normalized_timespec() is available as inline])
1087         ])
1088 ])
1089
1090 dnl #
1091 dnl # 2.6.18 API change,
1092 dnl # timespec_sub() inline function available in linux/time.h
1093 dnl #
1094 AC_DEFUN([SPL_AC_TIMESPEC_SUB], [
1095         AC_MSG_CHECKING([whether timespec_sub() is available])
1096         SPL_LINUX_TRY_COMPILE([
1097                 #include <linux/time.h>
1098         ],[
1099                 struct timespec a = { 0 };
1100                 struct timespec b = { 0 };
1101                 struct timespec c __attribute__ ((unused));
1102                 c = timespec_sub(a, b);
1103         ],[
1104                 AC_MSG_RESULT(yes)
1105                 AC_DEFINE(HAVE_TIMESPEC_SUB, 1, [timespec_sub() is available])
1106         ],[
1107                 AC_MSG_RESULT(no)
1108         ])
1109 ])
1110
1111 dnl #
1112 dnl # 2.6.19 API change,
1113 dnl # check if init_utsname() is available in linux/utsname.h
1114 dnl #
1115 AC_DEFUN([SPL_AC_INIT_UTSNAME], [
1116         AC_MSG_CHECKING([whether init_utsname() is available])
1117         SPL_LINUX_TRY_COMPILE([
1118                 #include <linux/utsname.h>
1119         ],[
1120                 struct new_utsname *a __attribute__ ((unused));
1121                 a = init_utsname();
1122         ],[
1123                 AC_MSG_RESULT(yes)
1124                 AC_DEFINE(HAVE_INIT_UTSNAME, 1, [init_utsname() is available])
1125         ],[
1126                 AC_MSG_RESULT(no)
1127         ])
1128 ])
1129
1130 dnl #
1131 dnl # 2.6.18 API change,
1132 dnl # added linux/uaccess.h
1133 dnl #
1134 AC_DEFUN([SPL_AC_UACCESS_HEADER], [
1135         SPL_CHECK_HEADER([linux/uaccess.h], [UACCESS], [], [])
1136 ])
1137
1138 dnl #
1139 dnl # 2.6.12 API change,
1140 dnl # check whether 'kmalloc_node()' is available.
1141 dnl #
1142 AC_DEFUN([SPL_AC_KMALLOC_NODE], [
1143         AC_MSG_CHECKING([whether kmalloc_node() is available])
1144         SPL_LINUX_TRY_COMPILE([
1145                 #include <linux/slab.h>
1146         ],[
1147                 void *a __attribute__ ((unused));
1148                 a = kmalloc_node(1, GFP_KERNEL, 0);
1149         ],[
1150                 AC_MSG_RESULT(yes)
1151                 AC_DEFINE(HAVE_KMALLOC_NODE, 1, [kmalloc_node() is available])
1152         ],[
1153                 AC_MSG_RESULT(no)
1154         ])
1155 ])
1156
1157 dnl #
1158 dnl # 2.6.9 API change,
1159 dnl # check whether 'monotonic_clock()' is available it may
1160 dnl # be available for some archs but not others.
1161 dnl #
1162 AC_DEFUN([SPL_AC_MONOTONIC_CLOCK],
1163         [AC_MSG_CHECKING([whether monotonic_clock() is available])
1164         SPL_LINUX_TRY_COMPILE_SYMBOL([
1165                 #include <linux/timex.h>
1166         ], [
1167                 monotonic_clock();
1168         ], [monotonic_clock], [], [
1169                 AC_MSG_RESULT(yes)
1170                 AC_DEFINE(HAVE_MONOTONIC_CLOCK, 1,
1171                           [monotonic_clock() is available])
1172         ], [
1173                 AC_MSG_RESULT(no)
1174         ])
1175 ])
1176
1177 dnl #
1178 dnl # 2.6.16 API change,
1179 dnl # check whether 'struct inode' has i_mutex
1180 dnl #
1181 AC_DEFUN([SPL_AC_INODE_I_MUTEX], [
1182         AC_MSG_CHECKING([whether struct inode has i_mutex])
1183         SPL_LINUX_TRY_COMPILE([
1184                 #include <linux/fs.h>
1185                 #include <linux/mutex.h>
1186         ],[
1187                 struct inode i;
1188                 mutex_init(&i.i_mutex);
1189         ],[
1190                 AC_MSG_RESULT(yes)
1191                 AC_DEFINE(HAVE_INODE_I_MUTEX, 1, [struct inode has i_mutex])
1192         ],[
1193                 AC_MSG_RESULT(no)
1194         ])
1195 ])
1196
1197 dnl #
1198 dnl # 2.6.29 API change,
1199 dnl # Adaptive mutexs introduced.
1200 dnl #
1201 AC_DEFUN([SPL_AC_MUTEX_OWNER], [
1202         AC_MSG_CHECKING([whether struct mutex has owner])
1203         SPL_LINUX_TRY_COMPILE([
1204                 #include <linux/mutex.h>
1205         ],[
1206                 struct mutex mtx __attribute__ ((unused));
1207                 mtx.owner = NULL;
1208         ],[
1209                 AC_MSG_RESULT(yes)
1210                 AC_DEFINE(HAVE_MUTEX_OWNER, 1, [struct mutex has owner])
1211         ],[
1212                 AC_MSG_RESULT(no)
1213         ])
1214 ])
1215
1216 dnl #
1217 dnl # 2.6.39 API change,
1218 dnl # Owner type change.  A Linux mutex prior to 2.6.39 would store
1219 dnl # the owner as a thread_info pointer when CONFIG_DEBUG_MUTEXES
1220 dnl # was defined.  As of 2.6.39 this was changed to a task_struct
1221 dnl # pointer which frankly makes a lot more sense.
1222 dnl #
1223 AC_DEFUN([SPL_AC_MUTEX_OWNER_TASK_STRUCT], [
1224         AC_MSG_CHECKING([whether struct mutex owner is a task_struct])
1225         tmp_flags="$EXTRA_KCFLAGS"
1226         EXTRA_KCFLAGS="-Werror"
1227         SPL_LINUX_TRY_COMPILE([
1228                 #include <linux/mutex.h>
1229                 #include <linux/sched.h>
1230         ],[
1231                 struct mutex mtx __attribute__ ((unused));
1232                 mtx.owner = current;
1233         ],[
1234                 AC_MSG_RESULT(yes)
1235                 AC_DEFINE(HAVE_MUTEX_OWNER_TASK_STRUCT, 1,
1236                 [struct mutex owner is a task_struct])
1237         ],[
1238                 AC_MSG_RESULT(no)
1239         ])
1240         EXTRA_KCFLAGS="$tmp_flags"
1241 ])
1242
1243 dnl #
1244 dnl # 2.6.18 API change,
1245 dnl # First introduced 'mutex_lock_nested()' in include/linux/mutex.h,
1246 dnl # as part of the mutex validator.  Fallback to using 'mutex_lock()'
1247 dnl # if the mutex validator is disabled or otherwise unavailable.
1248 dnl #
1249 AC_DEFUN([SPL_AC_MUTEX_LOCK_NESTED], [
1250         AC_MSG_CHECKING([whether mutex_lock_nested() is available])
1251         SPL_LINUX_TRY_COMPILE([
1252                 #include <linux/mutex.h>
1253         ],[
1254                 struct mutex mutex;
1255                 mutex_init(&mutex);
1256                 mutex_lock_nested(&mutex, 0);
1257         ],[
1258                 AC_MSG_RESULT(yes)
1259                 AC_DEFINE(HAVE_MUTEX_LOCK_NESTED, 1,
1260                 [mutex_lock_nested() is available])
1261         ],[
1262                 AC_MSG_RESULT(no)
1263         ])
1264 ])
1265
1266 dnl #
1267 dnl # 2.6.27 API change,
1268 dnl # on_each_cpu() uses 3 args, no 'retry' argument
1269 dnl #
1270 AC_DEFUN([SPL_AC_3ARGS_ON_EACH_CPU], [
1271         AC_MSG_CHECKING([whether on_each_cpu() wants 3 args])
1272         SPL_LINUX_TRY_COMPILE([
1273                 #include <linux/interrupt.h>
1274                 #include <linux/smp.h>
1275
1276                 void on_each_cpu_func(void *data) { return; }
1277         ],[
1278                 on_each_cpu(on_each_cpu_func, NULL, 0);
1279         ],[
1280                 AC_MSG_RESULT(yes)
1281                 AC_DEFINE(HAVE_3ARGS_ON_EACH_CPU, 1,
1282                           [on_each_cpu wants 3 args])
1283         ],[
1284                 AC_MSG_RESULT(no)
1285         ])
1286 ])
1287
1288 dnl #
1289 dnl # 2.6.18 API change,
1290 dnl # kallsyms_lookup_name no longer exported
1291 dnl #
1292 AC_DEFUN([SPL_AC_KALLSYMS_LOOKUP_NAME],
1293         [AC_MSG_CHECKING([whether kallsyms_lookup_name() is available])
1294         SPL_LINUX_TRY_COMPILE_SYMBOL([
1295                 #include <linux/kallsyms.h>
1296         ], [
1297                 kallsyms_lookup_name(NULL);
1298         ], [kallsyms_lookup_name], [], [
1299                 AC_MSG_RESULT(yes)
1300                 AC_DEFINE(HAVE_KALLSYMS_LOOKUP_NAME, 1,
1301                           [kallsyms_lookup_name() is available])
1302         ], [
1303                 AC_MSG_RESULT(no)
1304         ])
1305 ])
1306
1307 dnl #
1308 dnl # Proposed API change,
1309 dnl # This symbol is not available in stock kernels.  You may build a
1310 dnl # custom kernel with the *-spl-export-symbols.patch which will export
1311 dnl # these symbols for use.  If your already rolling a custom kernel for
1312 dnl # your environment this is recommended.
1313 dnl #
1314 AC_DEFUN([SPL_AC_GET_VMALLOC_INFO],
1315         [AC_MSG_CHECKING([whether get_vmalloc_info() is available])
1316         SPL_CHECK_SYMBOL_EXPORT([get_vmalloc_info], [], [
1317                 AC_MSG_RESULT(yes)
1318                 AC_DEFINE(HAVE_GET_VMALLOC_INFO, 1,
1319                           [get_vmalloc_info() is available])
1320         ], [
1321                 AC_MSG_RESULT(no)
1322         ])
1323 ])
1324
1325 dnl #
1326 dnl # 2.6.17 API change
1327 dnl # The helper functions first_online_pgdat(), next_online_pgdat(), and
1328 dnl # next_zone() are introduced to simplify for_each_zone().  These symbols
1329 dnl # were exported in 2.6.17 for use by modules which was consistent with
1330 dnl # the previous implementation of for_each_zone().  From 2.6.18 - 2.6.19
1331 dnl # the symbols were exported as 'unused', and by 2.6.20 they exports
1332 dnl # were dropped entirely leaving modules no way to directly iterate over
1333 dnl # the zone list.  Because we need access to the zone helpers we check
1334 dnl # if the kernel contains the old or new implementation.  Then we check
1335 dnl # to see if the symbols we need for each version are available.  If they
1336 dnl # are not, dynamically aquire the addresses with kallsyms_lookup_name().
1337 dnl #
1338 AC_DEFUN([SPL_AC_PGDAT_HELPERS], [
1339         AC_MSG_CHECKING([whether symbol *_pgdat exist])
1340         grep -q -E 'first_online_pgdat' $LINUX/include/linux/mmzone.h 2>/dev/null
1341         rc=$?
1342         if test $rc -eq 0; then
1343                 AC_MSG_RESULT([yes])
1344                 AC_DEFINE(HAVE_PGDAT_HELPERS, 1, [pgdat helpers are available])
1345         else
1346                 AC_MSG_RESULT([no])
1347         fi
1348 ])
1349
1350 dnl #
1351 dnl # Proposed API change,
1352 dnl # This symbol is not available in stock kernels.  You may build a
1353 dnl # custom kernel with the *-spl-export-symbols.patch which will export
1354 dnl # these symbols for use.  If your already rolling a custom kernel for
1355 dnl # your environment this is recommended.
1356 dnl #
1357 AC_DEFUN([SPL_AC_FIRST_ONLINE_PGDAT],
1358         [AC_MSG_CHECKING([whether first_online_pgdat() is available])
1359         SPL_LINUX_TRY_COMPILE_SYMBOL([
1360                 #include <linux/mmzone.h>
1361         ], [
1362                 first_online_pgdat();
1363         ], [first_online_pgdat], [], [
1364                 AC_MSG_RESULT(yes)
1365                 AC_DEFINE(HAVE_FIRST_ONLINE_PGDAT, 1,
1366                           [first_online_pgdat() is available])
1367         ], [
1368                 AC_MSG_RESULT(no)
1369         ])
1370 ])
1371
1372 dnl #
1373 dnl # Proposed API change,
1374 dnl # This symbol is not available in stock kernels.  You may build a
1375 dnl # custom kernel with the *-spl-export-symbols.patch which will export
1376 dnl # these symbols for use.  If your already rolling a custom kernel for
1377 dnl # your environment this is recommended.
1378 dnl #
1379 AC_DEFUN([SPL_AC_NEXT_ONLINE_PGDAT],
1380         [AC_MSG_CHECKING([whether next_online_pgdat() is available])
1381         SPL_LINUX_TRY_COMPILE_SYMBOL([
1382                 #include <linux/mmzone.h>
1383         ], [
1384                 next_online_pgdat(NULL);
1385         ], [next_online_pgdat], [], [
1386                 AC_MSG_RESULT(yes)
1387                 AC_DEFINE(HAVE_NEXT_ONLINE_PGDAT, 1,
1388                           [next_online_pgdat() is available])
1389         ], [
1390                 AC_MSG_RESULT(no)
1391         ])
1392 ])
1393
1394 dnl #
1395 dnl # Proposed API change,
1396 dnl # This symbol is not available in stock kernels.  You may build a
1397 dnl # custom kernel with the *-spl-export-symbols.patch which will export
1398 dnl # these symbols for use.  If your already rolling a custom kernel for
1399 dnl # your environment this is recommended.
1400 dnl #
1401 AC_DEFUN([SPL_AC_NEXT_ZONE],
1402         [AC_MSG_CHECKING([whether next_zone() is available])
1403         SPL_LINUX_TRY_COMPILE_SYMBOL([
1404                 #include <linux/mmzone.h>
1405         ], [
1406                 next_zone(NULL);
1407         ], [next_zone], [], [
1408                 AC_MSG_RESULT(yes)
1409                 AC_DEFINE(HAVE_NEXT_ZONE, 1, [next_zone() is available])
1410         ], [
1411                 AC_MSG_RESULT(no)
1412         ])
1413 ])
1414
1415 dnl #
1416 dnl # 2.6.17 API change,
1417 dnl # See SPL_AC_PGDAT_HELPERS for details.
1418 dnl #
1419 AC_DEFUN([SPL_AC_PGDAT_LIST],
1420         [AC_MSG_CHECKING([whether pgdat_list is available])
1421         SPL_LINUX_TRY_COMPILE_SYMBOL([
1422                 #include <linux/topology.h>
1423                 pg_data_t *tmp = pgdat_list;
1424         ], [], [pgdat_list], [], [
1425                 AC_MSG_RESULT(yes)
1426                 AC_DEFINE(HAVE_PGDAT_LIST, 1, [pgdat_list is available])
1427         ], [
1428                 AC_MSG_RESULT(no)
1429         ])
1430 ])
1431
1432 dnl #
1433 dnl # 2.6.18 API change,
1434 dnl # First introduced global_page_state() support as an inline.
1435 dnl #
1436 AC_DEFUN([SPL_AC_GLOBAL_PAGE_STATE], [
1437         AC_MSG_CHECKING([whether global_page_state() is available])
1438         SPL_LINUX_TRY_COMPILE([
1439                 #include <linux/mm.h>
1440         ],[
1441                 unsigned long state __attribute__ ((unused));
1442                 state = global_page_state(0);
1443         ],[
1444                 AC_MSG_RESULT(yes)
1445                 AC_DEFINE(HAVE_GLOBAL_PAGE_STATE, 1,
1446                           [global_page_state() is available])
1447         ],[
1448                 AC_MSG_RESULT(no)
1449         ])
1450 ])
1451
1452 dnl #
1453 dnl # 2.6.21 API change (plus subsequent naming convention changes),
1454 dnl # Public global zone stats now include a free page count.  However
1455 dnl # the enumerated names of the counters have changed since this API
1456 dnl # was introduced.  We need to deduce the corrent name to use.  This
1457 dnl # replaces the priviate get_zone_counts() interface.
1458 dnl #
1459 dnl # NR_FREE_PAGES was available from 2.6.21 to current kernels, which
1460 dnl # is 2.6.30 as of when this was written.
1461 dnl #
1462 AC_DEFUN([SPL_AC_ZONE_STAT_ITEM_FREE], [
1463         AC_MSG_CHECKING([whether page state NR_FREE_PAGES is available])
1464         SPL_LINUX_TRY_COMPILE([
1465                 #include <linux/mm.h>
1466         ],[
1467                 enum zone_stat_item zsi __attribute__ ((unused));
1468                 zsi = NR_FREE_PAGES;
1469         ],[
1470                 AC_MSG_RESULT(yes)
1471                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_FREE_PAGES, 1,
1472                           [Page state NR_FREE_PAGES is available])
1473         ],[
1474                 AC_MSG_RESULT(no)
1475         ])
1476 ])
1477
1478 dnl #
1479 dnl # 2.6.21 API change (plus subsequent naming convention changes),
1480 dnl # Public global zone stats now include an inactive page count.  However
1481 dnl # the enumerated names of the counters have changed since this API
1482 dnl # was introduced.  We need to deduce the corrent name to use.  This
1483 dnl # replaces the priviate get_zone_counts() interface.
1484 dnl #
1485 dnl # NR_INACTIVE was available from 2.6.21 to 2.6.27 and included both
1486 dnl # anonymous and file inactive pages.  As of 2.6.28 it was split in
1487 dnl # to NR_INACTIVE_ANON and NR_INACTIVE_FILE.
1488 dnl #
1489 AC_DEFUN([SPL_AC_ZONE_STAT_ITEM_INACTIVE], [
1490         AC_MSG_CHECKING([whether page state NR_INACTIVE is available])
1491         SPL_LINUX_TRY_COMPILE([
1492                 #include <linux/mm.h>
1493         ],[
1494                 enum zone_stat_item zsi __attribute__ ((unused));
1495                 zsi = NR_INACTIVE;
1496         ],[
1497                 AC_MSG_RESULT(yes)
1498                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_INACTIVE, 1,
1499                           [Page state NR_INACTIVE is available])
1500         ],[
1501                 AC_MSG_RESULT(no)
1502         ])
1503
1504         AC_MSG_CHECKING([whether page state NR_INACTIVE_ANON is available])
1505         SPL_LINUX_TRY_COMPILE([
1506                 #include <linux/mm.h>
1507         ],[
1508                 enum zone_stat_item zsi __attribute__ ((unused));
1509                 zsi = NR_INACTIVE_ANON;
1510         ],[
1511                 AC_MSG_RESULT(yes)
1512                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_ANON, 1,
1513                           [Page state NR_INACTIVE_ANON is available])
1514         ],[
1515                 AC_MSG_RESULT(no)
1516         ])
1517
1518         AC_MSG_CHECKING([whether page state NR_INACTIVE_FILE is available])
1519         SPL_LINUX_TRY_COMPILE([
1520                 #include <linux/mm.h>
1521         ],[
1522                 enum zone_stat_item zsi __attribute__ ((unused));
1523                 zsi = NR_INACTIVE_FILE;
1524         ],[
1525                 AC_MSG_RESULT(yes)
1526                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_FILE, 1,
1527                           [Page state NR_INACTIVE_FILE is available])
1528         ],[
1529                 AC_MSG_RESULT(no)
1530         ])
1531 ])
1532
1533 dnl #
1534 dnl # 2.6.21 API change (plus subsequent naming convention changes),
1535 dnl # Public global zone stats now include an active page count.  However
1536 dnl # the enumerated names of the counters have changed since this API
1537 dnl # was introduced.  We need to deduce the corrent name to use.  This
1538 dnl # replaces the priviate get_zone_counts() interface.
1539 dnl #
1540 dnl # NR_ACTIVE was available from 2.6.21 to 2.6.27 and included both
1541 dnl # anonymous and file active pages.  As of 2.6.28 it was split in
1542 dnl # to NR_ACTIVE_ANON and NR_ACTIVE_FILE.
1543 dnl #
1544 AC_DEFUN([SPL_AC_ZONE_STAT_ITEM_ACTIVE], [
1545         AC_MSG_CHECKING([whether page state NR_ACTIVE is available])
1546         SPL_LINUX_TRY_COMPILE([
1547                 #include <linux/mm.h>
1548         ],[
1549                 enum zone_stat_item zsi __attribute__ ((unused));
1550                 zsi = NR_ACTIVE;
1551         ],[
1552                 AC_MSG_RESULT(yes)
1553                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_ACTIVE, 1,
1554                           [Page state NR_ACTIVE is available])
1555         ],[
1556                 AC_MSG_RESULT(no)
1557         ])
1558
1559         AC_MSG_CHECKING([whether page state NR_ACTIVE_ANON is available])
1560         SPL_LINUX_TRY_COMPILE([
1561                 #include <linux/mm.h>
1562         ],[
1563                 enum zone_stat_item zsi __attribute__ ((unused));
1564                 zsi = NR_ACTIVE_ANON;
1565         ],[
1566                 AC_MSG_RESULT(yes)
1567                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_ANON, 1,
1568                           [Page state NR_ACTIVE_ANON is available])
1569         ],[
1570                 AC_MSG_RESULT(no)
1571         ])
1572
1573         AC_MSG_CHECKING([whether page state NR_ACTIVE_FILE is available])
1574         SPL_LINUX_TRY_COMPILE([
1575                 #include <linux/mm.h>
1576         ],[
1577                 enum zone_stat_item zsi __attribute__ ((unused));
1578                 zsi = NR_ACTIVE_FILE;
1579         ],[
1580                 AC_MSG_RESULT(yes)
1581                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_FILE, 1,
1582                           [Page state NR_ACTIVE_FILE is available])
1583         ],[
1584                 AC_MSG_RESULT(no)
1585         ])
1586 ])
1587
1588 dnl #
1589 dnl # Proposed API change for legacy kernels.
1590 dnl # This symbol is not available in older kernels.  For kernels post
1591 dnl # 2.6.21 the global_page_state() API is used to get free/inactive/active
1592 dnl # page state information.  This symbol is only used in legacy kernels
1593 dnl # any only as a last resort.
1594 dnl
1595 AC_DEFUN([SPL_AC_GET_ZONE_COUNTS], [
1596         AC_MSG_CHECKING([whether symbol get_zone_counts is needed])
1597         SPL_LINUX_TRY_COMPILE([
1598         ],[
1599                 #if !defined(HAVE_ZONE_STAT_ITEM_NR_FREE_PAGES)
1600                 #error "global_page_state needs NR_FREE_PAGES"
1601                 #endif
1602
1603                 #if !defined(HAVE_ZONE_STAT_ITEM_NR_ACTIVE) && \
1604                     !defined(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_ANON) && \
1605                     !defined(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_FILE)
1606                 #error "global_page_state needs NR_ACTIVE*"
1607                 #endif
1608
1609                 #if !defined(HAVE_ZONE_STAT_ITEM_NR_INACTIVE) && \
1610                     !defined(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_ANON) && \
1611                     !defined(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_FILE)
1612                 #error "global_page_state needs NR_INACTIVE*"
1613                 #endif
1614         ],[
1615                 AC_MSG_RESULT(no)
1616         ],[
1617                 AC_MSG_RESULT(yes)
1618                 AC_DEFINE(NEED_GET_ZONE_COUNTS, 1,
1619                           [get_zone_counts() is needed])
1620
1621                 AC_MSG_CHECKING([whether get_zone_counts() is available])
1622                 SPL_LINUX_TRY_COMPILE_SYMBOL([
1623                         #include <linux/mmzone.h>
1624                 ], [
1625                         get_zone_counts(NULL, NULL, NULL);
1626                 ], [get_zone_counts], [], [
1627                         AC_MSG_RESULT(yes)
1628                         AC_DEFINE(HAVE_GET_ZONE_COUNTS, 1,
1629                                   [get_zone_counts() is available])
1630                 ], [
1631                         AC_MSG_RESULT(no)
1632                 ])
1633         ])
1634 ])
1635
1636 dnl #
1637 dnl # 2.6.27 API change,
1638 dnl # The user_path_dir() replaces __user_walk()
1639 dnl #
1640 AC_DEFUN([SPL_AC_USER_PATH_DIR],
1641         [AC_MSG_CHECKING([whether user_path_dir() is available])
1642         SPL_LINUX_TRY_COMPILE_SYMBOL([
1643                 #include <linux/fcntl.h>
1644                 #include <linux/namei.h>
1645         ], [
1646                 user_path_dir(NULL, NULL);
1647         ], [user_path_at], [], [
1648                 AC_MSG_RESULT(yes)
1649                 AC_DEFINE(HAVE_USER_PATH_DIR, 1, [user_path_dir() is available])
1650         ], [
1651                 AC_MSG_RESULT(no)
1652         ])
1653 ])
1654
1655 dnl #
1656 dnl # Symbol available in RHEL kernels not in stock kernels.
1657 dnl #
1658 AC_DEFUN([SPL_AC_SET_FS_PWD],
1659         [AC_MSG_CHECKING([whether set_fs_pwd() is available])
1660         SPL_LINUX_TRY_COMPILE_SYMBOL([
1661                 #include <linux/spinlock.h>
1662                 #include <linux/fs_struct.h>
1663         ], [
1664                 (void) set_fs_pwd;
1665         ], [set_fs_pwd], [], [
1666                 AC_MSG_RESULT(yes)
1667                 AC_DEFINE(HAVE_SET_FS_PWD, 1, [set_fs_pwd() is available])
1668         ], [
1669                 AC_MSG_RESULT(no)
1670         ])
1671 ])
1672
1673 dnl #
1674 dnl # 2.6.25 API change,
1675 dnl # Simplied API by replacing mnt+dentry args with a single path arg.
1676 dnl #
1677 AC_DEFUN([SPL_AC_2ARGS_SET_FS_PWD],
1678         [AC_MSG_CHECKING([whether set_fs_pwd() wants 2 args])
1679         SPL_LINUX_TRY_COMPILE([
1680                 #include <linux/sched.h>
1681                 #include <linux/fs_struct.h>
1682         ],[
1683                 set_fs_pwd(NULL, NULL);
1684         ],[
1685                 AC_MSG_RESULT(yes)
1686                 AC_DEFINE(HAVE_2ARGS_SET_FS_PWD, 1,
1687                           [set_fs_pwd() wants 2 args])
1688         ],[
1689                 AC_MSG_RESULT(no)
1690         ])
1691 ])
1692
1693 dnl #
1694 dnl # SLES API change, never adopted in mainline,
1695 dnl # Third 'struct vfsmount *' argument removed.
1696 dnl #
1697 AC_DEFUN([SPL_AC_2ARGS_VFS_UNLINK],
1698         [AC_MSG_CHECKING([whether vfs_unlink() wants 2 args])
1699         SPL_LINUX_TRY_COMPILE([
1700                 #include <linux/fs.h>
1701         ],[
1702                 vfs_unlink(NULL, NULL);
1703         ],[
1704                 AC_MSG_RESULT(yes)
1705                 AC_DEFINE(HAVE_2ARGS_VFS_UNLINK, 1,
1706                           [vfs_unlink() wants 2 args])
1707         ],[
1708                 AC_MSG_RESULT(no)
1709         ])
1710 ])
1711
1712 dnl #
1713 dnl # SLES API change, never adopted in mainline,
1714 dnl # Third and sixth 'struct vfsmount *' argument removed.
1715 dnl #
1716 AC_DEFUN([SPL_AC_4ARGS_VFS_RENAME],
1717         [AC_MSG_CHECKING([whether vfs_rename() wants 4 args])
1718         SPL_LINUX_TRY_COMPILE([
1719                 #include <linux/fs.h>
1720         ],[
1721                 vfs_rename(NULL, NULL, NULL, NULL);
1722         ],[
1723                 AC_MSG_RESULT(yes)
1724                 AC_DEFINE(HAVE_4ARGS_VFS_RENAME, 1,
1725                           [vfs_rename() wants 4 args])
1726         ],[
1727                 AC_MSG_RESULT(no)
1728         ])
1729 ])
1730
1731 dnl #
1732 dnl # 2.6.36 API change,
1733 dnl # The 'struct fs_struct->lock' was changed from a rwlock_t to
1734 dnl # a spinlock_t to improve the fastpath performance.
1735 dnl #
1736 AC_DEFUN([SPL_AC_FS_STRUCT_SPINLOCK], [
1737         AC_MSG_CHECKING([whether struct fs_struct uses spinlock_t])
1738         tmp_flags="$EXTRA_KCFLAGS"
1739         EXTRA_KCFLAGS="-Werror"
1740         SPL_LINUX_TRY_COMPILE([
1741                 #include <linux/sched.h>
1742                 #include <linux/fs_struct.h>
1743         ],[
1744                 struct fs_struct fs;
1745                 spin_lock_init(&fs.lock);
1746         ],[
1747                 AC_MSG_RESULT(yes)
1748                 AC_DEFINE(HAVE_FS_STRUCT_SPINLOCK, 1,
1749                           [struct fs_struct uses spinlock_t])
1750         ],[
1751                 AC_MSG_RESULT(no)
1752         ])
1753         EXTRA_KCFLAGS="$tmp_flags"
1754 ])
1755
1756 dnl #
1757 dnl # 2.6.29 API change,
1758 dnl # check whether 'struct cred' exists
1759 dnl #
1760 AC_DEFUN([SPL_AC_CRED_STRUCT], [
1761         AC_MSG_CHECKING([whether struct cred exists])
1762         SPL_LINUX_TRY_COMPILE([
1763                 #include <linux/cred.h>
1764         ],[
1765                 struct cred *cr __attribute__ ((unused));
1766                 cr  = NULL;
1767         ],[
1768                 AC_MSG_RESULT(yes)
1769                 AC_DEFINE(HAVE_CRED_STRUCT, 1, [struct cred exists])
1770         ],[
1771                 AC_MSG_RESULT(no)
1772         ])
1773 ])
1774
1775 dnl #
1776 dnl # Custom SPL patch may export this symbol.
1777 dnl #
1778 AC_DEFUN([SPL_AC_GROUPS_SEARCH],
1779         [AC_MSG_CHECKING([whether groups_search() is available])
1780         SPL_LINUX_TRY_COMPILE_SYMBOL([
1781                 #include <linux/cred.h>
1782         ], [
1783                 groups_search(NULL, 0);
1784         ], [groups_search], [], [
1785                 AC_MSG_RESULT(yes)
1786                 AC_DEFINE(HAVE_GROUPS_SEARCH, 1, [groups_search() is available])
1787         ], [
1788                 AC_MSG_RESULT(no)
1789         ])
1790 ])
1791
1792 dnl #
1793 dnl # 2.6.x API change,
1794 dnl # __put_task_struct() was exported in RHEL5 but unavailable elsewhere.
1795 dnl #
1796 AC_DEFUN([SPL_AC_PUT_TASK_STRUCT],
1797         [AC_MSG_CHECKING([whether __put_task_struct() is available])
1798         SPL_LINUX_TRY_COMPILE_SYMBOL([
1799                 #include <linux/sched.h>
1800         ], [
1801                 __put_task_struct(NULL);
1802         ], [__put_task_struct], [], [
1803                 AC_MSG_RESULT(yes)
1804                 AC_DEFINE(HAVE_PUT_TASK_STRUCT, 1,
1805                           [__put_task_struct() is available])
1806         ], [
1807                 AC_MSG_RESULT(no)
1808         ])
1809 ])
1810
1811 dnl #
1812 dnl # 2.6.32 API change,
1813 dnl # Unused 'struct file *' removed from prototype.
1814 dnl #
1815 AC_DEFUN([SPL_AC_5ARGS_PROC_HANDLER], [
1816         AC_MSG_CHECKING([whether proc_handler() wants 5 args])
1817         SPL_LINUX_TRY_COMPILE([
1818                 #include <linux/sysctl.h>
1819         ],[
1820                 proc_dostring(NULL, 0, NULL, NULL, NULL);
1821         ],[
1822                 AC_MSG_RESULT(yes)
1823                 AC_DEFINE(HAVE_5ARGS_PROC_HANDLER, 1,
1824                           [proc_handler() wants 5 args])
1825         ],[
1826                 AC_MSG_RESULT(no)
1827         ])
1828 ])
1829
1830 dnl #
1831 dnl # 2.6.x API change,
1832 dnl # kvasprintf() function added.
1833 dnl #
1834 AC_DEFUN([SPL_AC_KVASPRINTF],
1835         [AC_MSG_CHECKING([whether kvasprintf() is available])
1836         SPL_LINUX_TRY_COMPILE_SYMBOL([
1837                 #include <linux/kernel.h>
1838         ], [
1839                 kvasprintf(0, NULL, *((va_list*)NULL));
1840         ], [kvasprintf], [], [
1841                 AC_MSG_RESULT(yes)
1842                 AC_DEFINE(HAVE_KVASPRINTF, 1, [kvasprintf() is available])
1843         ], [
1844                 AC_MSG_RESULT(no)
1845         ])
1846 ])
1847
1848 dnl #
1849 dnl # 2.6.29 API change,
1850 dnl # vfs_fsync() funcation added, prior to this use file_fsync().
1851 dnl #
1852 AC_DEFUN([SPL_AC_VFS_FSYNC],
1853         [AC_MSG_CHECKING([whether vfs_fsync() is available])
1854         SPL_LINUX_TRY_COMPILE_SYMBOL([
1855                 #include <linux/fs.h>
1856         ], [
1857                 (void) vfs_fsync;
1858         ], [vfs_fsync], [fs/sync.c], [
1859                 AC_MSG_RESULT(yes)
1860                 AC_DEFINE(HAVE_VFS_FSYNC, 1, [vfs_fsync() is available])
1861         ], [
1862                 AC_MSG_RESULT(no)
1863         ])
1864 ])
1865
1866 dnl #
1867 dnl # 2.6.35 API change,
1868 dnl # Unused 'struct dentry *' removed from vfs_fsync() prototype.
1869 dnl #
1870 AC_DEFUN([SPL_AC_2ARGS_VFS_FSYNC], [
1871         AC_MSG_CHECKING([whether vfs_fsync() wants 2 args])
1872         SPL_LINUX_TRY_COMPILE([
1873                 #include <linux/fs.h>
1874         ],[
1875                 vfs_fsync(NULL, 0);
1876         ],[
1877                 AC_MSG_RESULT(yes)
1878                 AC_DEFINE(HAVE_2ARGS_VFS_FSYNC, 1, [vfs_fsync() wants 2 args])
1879         ],[
1880                 AC_MSG_RESULT(no)
1881         ])
1882 ])
1883
1884 dnl #
1885 dnl # 3.5 API change,
1886 dnl # inode_operations.truncate_range removed
1887 dnl #
1888 AC_DEFUN([SPL_AC_INODE_TRUNCATE_RANGE], [
1889         AC_MSG_CHECKING([whether truncate_range() inode operation is available])
1890         SPL_LINUX_TRY_COMPILE([
1891                 #include <linux/fs.h>
1892         ],[
1893                 struct inode_operations ops;
1894                 ops.truncate_range = NULL;
1895         ],[
1896                 AC_MSG_RESULT(yes)
1897                 AC_DEFINE(HAVE_INODE_TRUNCATE_RANGE, 1,
1898                         [truncate_range() inode operation is available])
1899         ],[
1900                 AC_MSG_RESULT(no)
1901         ])
1902 ])
1903
1904 dnl #
1905 dnl # Linux 2.6.38 - 3.x API
1906 dnl #
1907 AC_DEFUN([SPL_AC_KERNEL_FILE_FALLOCATE], [
1908         AC_MSG_CHECKING([whether fops->fallocate() exists])
1909         SPL_LINUX_TRY_COMPILE([
1910                 #include <linux/fs.h>
1911         ],[
1912                 long (*fallocate) (struct file *, int, loff_t, loff_t) = NULL;
1913                 struct file_operations fops __attribute__ ((unused)) = {
1914                         .fallocate = fallocate,
1915                 };
1916         ],[
1917                 AC_MSG_RESULT(yes)
1918                 AC_DEFINE(HAVE_FILE_FALLOCATE, 1, [fops->fallocate() exists])
1919         ],[
1920                 AC_MSG_RESULT(no)
1921         ])
1922 ])
1923
1924 dnl #
1925 dnl # Linux 2.6.x - 2.6.37 API
1926 dnl #
1927 AC_DEFUN([SPL_AC_KERNEL_INODE_FALLOCATE], [
1928         AC_MSG_CHECKING([whether iops->fallocate() exists])
1929         SPL_LINUX_TRY_COMPILE([
1930                 #include <linux/fs.h>
1931         ],[
1932                 long (*fallocate) (struct inode *, int, loff_t, loff_t) = NULL;
1933                 struct inode_operations fops __attribute__ ((unused)) = {
1934                         .fallocate = fallocate,
1935                 };
1936         ],[
1937                 AC_MSG_RESULT(yes)
1938                 AC_DEFINE(HAVE_INODE_FALLOCATE, 1, [fops->fallocate() exists])
1939         ],[
1940                 AC_MSG_RESULT(no)
1941         ])
1942 ])
1943
1944 dnl #
1945 dnl # PaX Linux 2.6.38 - 3.x API
1946 dnl #
1947 AC_DEFUN([SPL_AC_PAX_KERNEL_FILE_FALLOCATE], [
1948         AC_MSG_CHECKING([whether fops->fallocate() exists])
1949         SPL_LINUX_TRY_COMPILE([
1950                 #include <linux/fs.h>
1951         ],[
1952                 long (*fallocate) (struct file *, int, loff_t, loff_t) = NULL;
1953                 struct file_operations_no_const fops __attribute__ ((unused)) = {
1954                         .fallocate = fallocate,
1955                 };
1956         ],[
1957                 AC_MSG_RESULT(yes)
1958                 AC_DEFINE(HAVE_FILE_FALLOCATE, 1, [fops->fallocate() exists])
1959         ],[
1960                 AC_MSG_RESULT(no)
1961         ])
1962 ])
1963
1964 dnl #
1965 dnl # The fallocate callback was moved from the inode_operations
1966 dnl # structure to the file_operations structure.
1967 dnl #
1968 AC_DEFUN([SPL_AC_KERNEL_FALLOCATE], [
1969         SPL_AC_KERNEL_FILE_FALLOCATE
1970         SPL_AC_KERNEL_INODE_FALLOCATE
1971         SPL_AC_PAX_KERNEL_FILE_FALLOCATE
1972 ])
1973
1974 dnl #
1975 dnl # 2.6.33 API change. Also backported in RHEL5 as of 2.6.18-190.el5.
1976 dnl # Earlier versions of rwsem_is_locked() were inline and had a race
1977 dnl # condition.  The fixed version is exported as a symbol.  The race
1978 dnl # condition is fixed by acquiring sem->wait_lock, so we must not
1979 dnl # call that version while holding sem->wait_lock.
1980 dnl #
1981 AC_DEFUN([SPL_AC_EXPORTED_RWSEM_IS_LOCKED],
1982         [AC_MSG_CHECKING([whether rwsem_is_locked() acquires sem->wait_lock])
1983         SPL_LINUX_TRY_COMPILE_SYMBOL([
1984                 #include <linux/rwsem.h>
1985                 int rwsem_is_locked(struct rw_semaphore *sem) { return 0; }
1986         ], [], [rwsem_is_locked], [lib/rwsem-spinlock.c], [
1987                 AC_MSG_RESULT(yes)
1988                 AC_DEFINE(RWSEM_IS_LOCKED_TAKES_WAIT_LOCK, 1,
1989                           [rwsem_is_locked() acquires sem->wait_lock])
1990         ], [
1991                 AC_MSG_RESULT(no)
1992         ])
1993 ])
1994
1995 dnl #
1996 dnl # 2.6.xx API compat,
1997 dnl # There currently exists no exposed API to partially shrink the dcache.
1998 dnl # The expected mechanism to shrink the cache is a registered shrinker
1999 dnl # which is called during memory pressure.
2000 dnl #
2001 AC_DEFUN([SPL_AC_SHRINK_DCACHE_MEMORY],
2002         [AC_MSG_CHECKING([whether shrink_dcache_memory() is available])
2003         SPL_LINUX_TRY_COMPILE_SYMBOL([
2004                 #include <linux/dcache.h>
2005         ], [
2006                 shrink_dcache_memory(0, 0);
2007         ], [shrink_dcache_memory], [fs/dcache.c], [
2008                 AC_MSG_RESULT(yes)
2009                 AC_DEFINE(HAVE_SHRINK_DCACHE_MEMORY, 1,
2010                           [shrink_dcache_memory() is available])
2011         ], [
2012                 AC_MSG_RESULT(no)
2013         ])
2014 ])
2015
2016 dnl #
2017 dnl # 2.6.xx API compat,
2018 dnl # There currently exists no exposed API to partially shrink the icache.
2019 dnl # The expected mechanism to shrink the cache is a registered shrinker
2020 dnl # which is called during memory pressure.
2021 dnl #
2022 AC_DEFUN([SPL_AC_SHRINK_ICACHE_MEMORY],
2023         [AC_MSG_CHECKING([whether shrink_icache_memory() is available])
2024         SPL_LINUX_TRY_COMPILE_SYMBOL([
2025                 #include <linux/dcache.h>
2026         ], [
2027                 shrink_icache_memory(0, 0);
2028         ], [shrink_icache_memory], [fs/inode.c], [
2029                 AC_MSG_RESULT(yes)
2030                 AC_DEFINE(HAVE_SHRINK_ICACHE_MEMORY, 1,
2031                           [shrink_icache_memory() is available])
2032         ], [
2033                 AC_MSG_RESULT(no)
2034         ])
2035 ])
2036
2037 dnl #
2038 dnl # 2.6.39 API compat,
2039 dnl # The path_lookup() function has been renamed to kern_path_parent()
2040 dnl # and the flags argument has been removed.  The only behavior now
2041 dnl # offered is that of LOOKUP_PARENT.  The spl already always passed
2042 dnl # this flag so dropping the flag does not impact us.
2043 dnl #
2044 AC_DEFUN([SPL_AC_KERN_PATH_PARENT_HEADER], [
2045         SPL_CHECK_SYMBOL_HEADER(
2046                 [kern_path_parent],
2047                 [int kern_path_parent(const char \*, struct nameidata \*)],
2048                 [include/linux/namei.h],
2049                 [AC_DEFINE(HAVE_KERN_PATH_PARENT_HEADER, 1,
2050                 [kern_path_parent() is available])],
2051                 [])
2052 ])
2053
2054 dnl #
2055 dnl # 3.1 API compat,
2056 dnl # The kern_path_parent() symbol is no longer exported by the kernel.
2057 dnl # However, it remains the prefered interface and since we still have
2058 dnl # access to the prototype we dynamically lookup the required address.
2059 dnl #
2060 AC_DEFUN([SPL_AC_KERN_PATH_PARENT_SYMBOL],
2061         [AC_MSG_CHECKING([whether kern_path_parent() is available])
2062         SPL_LINUX_TRY_COMPILE_SYMBOL([
2063                 #include <linux/namei.h>
2064         ], [
2065                 kern_path_parent(NULL, NULL);
2066         ], [kern_path_parent], [fs/namei.c], [
2067                 AC_MSG_RESULT(yes)
2068                 AC_DEFINE(HAVE_KERN_PATH_PARENT_SYMBOL, 1,
2069                           [kern_path_parent() is available])
2070         ], [
2071                 AC_MSG_RESULT(no)
2072         ])
2073 ])
2074
2075 dnl #
2076 dnl # 3.6 API compat,
2077 dnl # The kern_path_parent() function was replaced by the kern_path_locked()
2078 dnl # function to eliminate all struct nameidata usage outside fs/namei.c.
2079 dnl #
2080 AC_DEFUN([SPL_AC_KERN_PATH_LOCKED], [
2081         SPL_CHECK_SYMBOL_HEADER(
2082                 [kern_path_locked],
2083                 [struct dentry \*kern_path_locked(const char \*, struct path \*)],
2084                 [include/linux/namei.h],
2085                 [AC_DEFINE(HAVE_KERN_PATH_LOCKED, 1,
2086                 [kern_path_locked() is available])],
2087                 [])
2088 ])
2089
2090 dnl #
2091 dnl # /proc/kallsyms support,
2092 dnl # Verify the kernel has CONFIG_KALLSYMS support enabled.
2093 dnl #
2094 AC_DEFUN([SPL_AC_CONFIG_KALLSYMS], [
2095         AC_MSG_CHECKING([whether CONFIG_KALLSYMS is defined])
2096         SPL_LINUX_TRY_COMPILE([
2097                 #if !defined(CONFIG_KALLSYMS)
2098                 #error CONFIG_KALLSYMS not defined
2099                 #endif
2100         ],[ ],[
2101                 AC_MSG_RESULT([yes])
2102         ],[
2103                 AC_MSG_RESULT([no])
2104                 AC_MSG_ERROR([
2105         *** This kernel does not include the required kallsyms support.
2106         *** Rebuild the kernel with CONFIG_KALLSYMS=y set.])
2107         ])
2108 ])
2109
2110 dnl #
2111 dnl # zlib inflate compat,
2112 dnl # Verify the kernel has CONFIG_ZLIB_INFLATE support enabled.
2113 dnl #
2114 AC_DEFUN([SPL_AC_CONFIG_ZLIB_INFLATE], [
2115         AC_MSG_CHECKING([whether CONFIG_ZLIB_INFLATE is defined])
2116         SPL_LINUX_TRY_COMPILE([
2117                 #if !defined(CONFIG_ZLIB_INFLATE) && \
2118                     !defined(CONFIG_ZLIB_INFLATE_MODULE)
2119                 #error CONFIG_ZLIB_INFLATE not defined
2120                 #endif
2121         ],[ ],[
2122                 AC_MSG_RESULT([yes])
2123         ],[
2124                 AC_MSG_RESULT([no])
2125                 AC_MSG_ERROR([
2126         *** This kernel does not include the required zlib inflate support.
2127         *** Rebuild the kernel with CONFIG_ZLIB_INFLATE=y|m set.])
2128         ])
2129 ])
2130
2131 dnl #
2132 dnl # zlib deflate compat,
2133 dnl # Verify the kernel has CONFIG_ZLIB_DEFLATE support enabled.
2134 dnl #
2135 AC_DEFUN([SPL_AC_CONFIG_ZLIB_DEFLATE], [
2136         AC_MSG_CHECKING([whether CONFIG_ZLIB_DEFLATE is defined])
2137         SPL_LINUX_TRY_COMPILE([
2138                 #if !defined(CONFIG_ZLIB_DEFLATE) && \
2139                     !defined(CONFIG_ZLIB_DEFLATE_MODULE)
2140                 #error CONFIG_ZLIB_DEFLATE not defined
2141                 #endif
2142         ],[ ],[
2143                 AC_MSG_RESULT([yes])
2144         ],[
2145                 AC_MSG_RESULT([no])
2146                 AC_MSG_ERROR([
2147         *** This kernel does not include the required zlib deflate support.
2148         *** Rebuild the kernel with CONFIG_ZLIB_DEFLATE=y|m set.])
2149         ])
2150 ])
2151
2152 dnl #
2153 dnl # 2.6.39 API compat,
2154 dnl # The function zlib_deflate_workspacesize() now take 2 arguments.
2155 dnl # This was done to avoid always having to allocate the maximum size
2156 dnl # workspace (268K).  The caller can now specific the windowBits and
2157 dnl # memLevel compression parameters to get a smaller workspace.
2158 dnl #
2159 AC_DEFUN([SPL_AC_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE],
2160         [AC_MSG_CHECKING([whether zlib_deflate_workspacesize() wants 2 args])
2161         SPL_LINUX_TRY_COMPILE([
2162                 #include <linux/zlib.h>
2163         ],[
2164                 return zlib_deflate_workspacesize(MAX_WBITS, MAX_MEM_LEVEL);
2165         ],[
2166                 AC_MSG_RESULT(yes)
2167                 AC_DEFINE(HAVE_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE, 1,
2168                           [zlib_deflate_workspacesize() wants 2 args])
2169         ],[
2170                 AC_MSG_RESULT(no)
2171         ])
2172 ])
2173
2174 dnl #
2175 dnl # 2.6.39 API change,
2176 dnl # Shrinker adjust to use common shrink_control structure.
2177 dnl #
2178 AC_DEFUN([SPL_AC_SHRINK_CONTROL_STRUCT], [
2179         AC_MSG_CHECKING([whether struct shrink_control exists])
2180         SPL_LINUX_TRY_COMPILE([
2181                 #include <linux/mm.h>
2182         ],[
2183                 struct shrink_control sc __attribute__ ((unused));
2184
2185                 sc.nr_to_scan = 0;
2186                 sc.gfp_mask = GFP_KERNEL;
2187         ],[
2188                 AC_MSG_RESULT(yes)
2189                 AC_DEFINE(HAVE_SHRINK_CONTROL_STRUCT, 1,
2190                         [struct shrink_control exists])
2191         ],[
2192                 AC_MSG_RESULT(no)
2193         ])
2194 ])
2195
2196 dnl #
2197 dnl # 3.1 API Change
2198 dnl #
2199 dnl # The rw_semaphore.wait_lock member was changed from spinlock_t to
2200 dnl # raw_spinlock_t at commit ddb6c9b58a19edcfac93ac670b066c836ff729f1.
2201 dnl #
2202 AC_DEFUN([SPL_AC_RWSEM_SPINLOCK_IS_RAW], [
2203         AC_MSG_CHECKING([whether struct rw_semaphore member wait_lock is raw])
2204         tmp_flags="$EXTRA_KCFLAGS"
2205         EXTRA_KCFLAGS="-Werror"
2206         SPL_LINUX_TRY_COMPILE([
2207                 #include <linux/rwsem.h>
2208         ],[
2209                 struct rw_semaphore dummy_semaphore __attribute__ ((unused));
2210                 raw_spinlock_t dummy_lock __attribute__ ((unused));
2211                 dummy_semaphore.wait_lock = dummy_lock;
2212         ],[
2213                 AC_MSG_RESULT(yes)
2214                 AC_DEFINE(RWSEM_SPINLOCK_IS_RAW, 1,
2215                 [struct rw_semaphore member wait_lock is raw_spinlock_t])
2216         ],[
2217                 AC_MSG_RESULT(no)
2218         ])
2219         EXTRA_KCFLAGS="$tmp_flags"
2220 ])
2221
2222 dnl #
2223 dnl # 3.9 API change,
2224 dnl # Moved things from linux/sched.h to linux/sched/rt.h
2225 dnl #
2226 AC_DEFUN([SPL_AC_SCHED_RT_HEADER],
2227         [AC_MSG_CHECKING([whether header linux/sched/rt.h exists])
2228         SPL_LINUX_TRY_COMPILE([
2229                 #include <linux/sched.h>
2230                 #include <linux/sched/rt.h>
2231         ],[
2232                 return 0;
2233         ],[
2234                 AC_DEFINE(HAVE_SCHED_RT_HEADER, 1, [linux/sched/rt.h exists])
2235                 AC_MSG_RESULT(yes)
2236         ],[
2237                 AC_MSG_RESULT(no)
2238         ])
2239 ])