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 ###############################################################################
9 AC_DEFUN([SPL_AC_CONFIG_KERNEL], [
13 if test "${LINUX_OBJ}" != "${LINUX}"; then
14 KERNELMAKE_PARAMS="$KERNELMAKE_PARAMS O=$LINUX_OBJ"
16 AC_SUBST(KERNELMAKE_PARAMS)
18 KERNELCPPFLAGS="$KERNELCPPFLAGS -Wstrict-prototypes"
19 AC_SUBST(KERNELCPPFLAGS)
23 SPL_AC_DEBUG_KMEM_TRACKING
24 SPL_AC_ATOMIC_SPINLOCK
25 SPL_AC_TYPE_ATOMIC64_CMPXCHG
26 SPL_AC_TYPE_ATOMIC64_XCHG
28 SPL_AC_3ARGS_INIT_WORK
29 SPL_AC_2ARGS_REGISTER_SYSCTL
31 SPL_AC_3ARGS_SHRINKER_CALLBACK
32 SPL_AC_PATH_IN_NAMEIDATA
38 SPL_AC_5ARGS_DEVICE_CREATE
39 SPL_AC_CLASS_DEVICE_CREATE
40 SPL_AC_SET_NORMALIZED_TIMESPEC_EXPORT
41 SPL_AC_SET_NORMALIZED_TIMESPEC_INLINE
48 SPL_AC_MONOTONIC_CLOCK
51 SPL_AC_MUTEX_LOCK_NESTED
52 SPL_AC_3ARGS_ON_EACH_CPU
53 SPL_AC_KALLSYMS_LOOKUP_NAME
54 SPL_AC_GET_VMALLOC_INFO
56 SPL_AC_FIRST_ONLINE_PGDAT
57 SPL_AC_NEXT_ONLINE_PGDAT
60 SPL_AC_GLOBAL_PAGE_STATE
61 SPL_AC_ZONE_STAT_ITEM_FREE
62 SPL_AC_ZONE_STAT_ITEM_INACTIVE
63 SPL_AC_ZONE_STAT_ITEM_ACTIVE
64 SPL_AC_GET_ZONE_COUNTS
67 SPL_AC_2ARGS_SET_FS_PWD
68 SPL_AC_2ARGS_VFS_UNLINK
69 SPL_AC_4ARGS_VFS_RENAME
70 SPL_AC_FS_STRUCT_SPINLOCK
73 SPL_AC_PUT_TASK_STRUCT
74 SPL_AC_5ARGS_PROC_HANDLER
76 SPL_AC_3ARGS_FILE_FSYNC
77 SPL_AC_EXPORTED_RWSEM_IS_LOCKED
78 SPL_AC_KERNEL_INVALIDATE_INODES
81 AC_DEFUN([SPL_AC_MODULE_SYMVERS], [
82 modpost=$LINUX/scripts/Makefile.modpost
83 AC_MSG_CHECKING([kernel file name for module symbols])
84 if test -f "$modpost"; then
85 if grep -q Modules.symvers $modpost; then
86 LINUX_SYMBOLS=Modules.symvers
88 LINUX_SYMBOLS=Module.symvers
93 AC_MSG_RESULT($LINUX_SYMBOLS)
94 AC_SUBST(LINUX_SYMBOLS)
97 AC_DEFUN([SPL_AC_KERNEL], [
99 AS_HELP_STRING([--with-linux=PATH],
100 [Path to kernel source]),
101 [kernelsrc="$withval"])
103 AC_ARG_WITH([linux-obj],
104 AS_HELP_STRING([--with-linux-obj=PATH],
105 [Path to kernel build objects]),
106 [kernelbuild="$withval"])
108 AC_MSG_CHECKING([kernel source directory])
109 if test -z "$kernelsrc"; then
110 if test -e "/lib/modules/$(uname -r)/source"; then
111 headersdir="/lib/modules/$(uname -r)/source"
112 sourcelink=$(readlink -f "$headersdir")
113 elif test -e "/lib/modules/$(uname -r)/build"; then
114 headersdir="/lib/modules/$(uname -r)/build"
115 sourcelink=$(readlink -f "$headersdir")
117 sourcelink=$(ls -1d /usr/src/kernels/* \
119 2>/dev/null | grep -v obj | tail -1)
122 if test -n "$sourcelink" && test -e ${sourcelink}; then
123 kernelsrc=`readlink -f ${sourcelink}`
125 AC_MSG_RESULT([Not found])
127 *** Please make sure the kernel devel package for your distribution
128 *** is installed then try again. If that fails you can specify the
129 *** location of the kernel source with the '--with-linux=PATH' option.])
132 if test "$kernelsrc" = "NONE"; then
137 AC_MSG_RESULT([$kernelsrc])
138 AC_MSG_CHECKING([kernel build directory])
139 if test -z "$kernelbuild"; then
140 if test -e "/lib/modules/$(uname -r)/build"; then
141 kernelbuild=`readlink -f /lib/modules/$(uname -r)/build`
142 elif test -d ${kernelsrc}-obj/${target_cpu}/${target_cpu}; then
143 kernelbuild=${kernelsrc}-obj/${target_cpu}/${target_cpu}
144 elif test -d ${kernelsrc}-obj/${target_cpu}/default; then
145 kernelbuild=${kernelsrc}-obj/${target_cpu}/default
146 elif test -d `dirname ${kernelsrc}`/build-${target_cpu}; then
147 kernelbuild=`dirname ${kernelsrc}`/build-${target_cpu}
149 kernelbuild=${kernelsrc}
152 AC_MSG_RESULT([$kernelbuild])
154 AC_MSG_CHECKING([kernel source version])
155 utsrelease1=$kernelbuild/include/linux/version.h
156 utsrelease2=$kernelbuild/include/linux/utsrelease.h
157 utsrelease3=$kernelbuild/include/generated/utsrelease.h
158 if test -r $utsrelease1 && fgrep -q UTS_RELEASE $utsrelease1; then
159 utsrelease=linux/version.h
160 elif test -r $utsrelease2 && fgrep -q UTS_RELEASE $utsrelease2; then
161 utsrelease=linux/utsrelease.h
162 elif test -r $utsrelease3 && fgrep -q UTS_RELEASE $utsrelease3; then
163 utsrelease=generated/utsrelease.h
166 if test "$utsrelease"; then
167 kernsrcver=`(echo "#include <$utsrelease>";
168 echo "kernsrcver=UTS_RELEASE") |
169 cpp -I $kernelbuild/include |
170 grep "^kernsrcver=" | cut -d \" -f 2`
172 if test -z "$kernsrcver"; then
173 AC_MSG_RESULT([Not found])
174 AC_MSG_ERROR([*** Cannot determine kernel version.])
177 AC_MSG_RESULT([Not found])
178 AC_MSG_ERROR([*** Cannot find UTS_RELEASE definition.])
181 AC_MSG_RESULT([$kernsrcver])
184 LINUX_OBJ=${kernelbuild}
185 LINUX_VERSION=${kernsrcver}
189 AC_SUBST(LINUX_VERSION)
191 SPL_AC_MODULE_SYMVERS
194 AC_DEFUN([SPL_AC_KERNEL_CONFIG], [
195 SPL_LINUX_CONFIG([PREEMPT],
197 *** Kernel built with CONFIG_PREEMPT which is not supported.
198 ** You must rebuild your kernel without this option.]), [])
202 dnl # Explicitly check for gawk, we require it for the the usermode
203 dnl # helper. For some reason the standard awk command does not
204 dnl # behave correctly when invoked from the usermode helper.
206 AC_DEFUN([SPL_AC_GAWK], [
207 AS_IF([test "x$AWK" != xgawk], [
209 *** Required util gawk missing. Please install the required
210 *** gawk package for your distribution and try again.])
215 dnl # Default SPL user configuration
217 AC_DEFUN([SPL_AC_CONFIG_USER], [
222 dnl # Check for rpm+rpmbuild to build RPM packages. If these tools
223 dnl # are missing it is non-fatal but you will not be able to build
224 dnl # RPM packages and will be warned if you try too.
226 AC_DEFUN([SPL_AC_RPM], [
230 AC_MSG_CHECKING([whether $RPM is available])
231 AS_IF([tmp=$($RPM --version 2>/dev/null)], [
232 RPM_VERSION=$(echo $tmp | $AWK '/RPM/ { print $[3] }')
234 AC_MSG_RESULT([$HAVE_RPM ($RPM_VERSION)])
237 AC_MSG_RESULT([$HAVE_RPM])
240 AC_MSG_CHECKING([whether $RPMBUILD is available])
241 AS_IF([tmp=$($RPMBUILD --version 2>/dev/null)], [
242 RPMBUILD_VERSION=$(echo $tmp | $AWK '/RPM/ { print $[3] }')
244 AC_MSG_RESULT([$HAVE_RPMBUILD ($RPMBUILD_VERSION)])
247 AC_MSG_RESULT([$HAVE_RPMBUILD])
252 AC_SUBST(RPM_VERSION)
254 AC_SUBST(HAVE_RPMBUILD)
256 AC_SUBST(RPMBUILD_VERSION)
260 dnl # Check for dpkg+dpkg-buildpackage to build DEB packages. If these
261 dnl # tools are missing it is non-fatal but you will not be able to build
262 dnl # DEB packages and will be warned if you try too.
264 AC_DEFUN([SPL_AC_DPKG], [
266 DPKGBUILD=dpkg-buildpackage
268 AC_MSG_CHECKING([whether $DPKG is available])
269 AS_IF([tmp=$($DPKG --version 2>/dev/null)], [
270 DPKG_VERSION=$(echo $tmp | $AWK '/Debian/ { print $[7] }')
272 AC_MSG_RESULT([$HAVE_DPKG ($DPKG_VERSION)])
275 AC_MSG_RESULT([$HAVE_DPKG])
278 AC_MSG_CHECKING([whether $DPKGBUILD is available])
279 AS_IF([tmp=$($DPKGBUILD --version 2>/dev/null)], [
280 DPKGBUILD_VERSION=$(echo $tmp | \
281 $AWK '/Debian/ { print $[4] }' | cut -f-4 -d'.')
283 AC_MSG_RESULT([$HAVE_DPKGBUILD ($DPKGBUILD_VERSION)])
286 AC_MSG_RESULT([$HAVE_DPKGBUILD])
291 AC_SUBST(DPKG_VERSION)
293 AC_SUBST(HAVE_DPKGBUILD)
295 AC_SUBST(DPKGBUILD_VERSION)
299 dnl # Until native packaging for various different packing systems
300 dnl # can be added the least we can do is attempt to use alien to
301 dnl # convert the RPM packages to the needed package type. This is
302 dnl # a hack but so far it has worked reasonable well.
304 AC_DEFUN([SPL_AC_ALIEN], [
307 AC_MSG_CHECKING([whether $ALIEN is available])
308 AS_IF([tmp=$($ALIEN --version 2>/dev/null)], [
309 ALIEN_VERSION=$(echo $tmp | $AWK '{ print $[3] }')
311 AC_MSG_RESULT([$HAVE_ALIEN ($ALIEN_VERSION)])
314 AC_MSG_RESULT([$HAVE_ALIEN])
319 AC_SUBST(ALIEN_VERSION)
323 dnl # Using the VENDOR tag from config.guess set the default
324 dnl # package type for 'make pkg': (rpm | deb | tgz)
326 AC_DEFUN([SPL_AC_DEFAULT_PACKAGE], [
327 AC_MSG_CHECKING([linux distribution])
328 if test -f /etc/redhat-release ; then
330 elif test -f /etc/fedora-release ; then
332 elif test -f /etc/lsb-release ; then
334 elif test -f /etc/debian_version ; then
336 elif test -f /etc/SuSE-release ; then
338 elif test -f /etc/slackware-version ; then
340 elif test -f /etc/gentoo-release ; then
345 AC_MSG_RESULT([$VENDOR])
348 AC_MSG_CHECKING([default package type])
350 fedora) DEFAULT_PACKAGE=rpm ;;
351 redhat) DEFAULT_PACKAGE=rpm ;;
352 sles) DEFAULT_PACKAGE=rpm ;;
353 ubuntu) DEFAULT_PACKAGE=deb ;;
354 debian) DEFAULT_PACKAGE=deb ;;
355 slackware) DEFAULT_PACKAGE=tgz ;;
356 *) DEFAULT_PACKAGE=rpm ;;
359 AC_MSG_RESULT([$DEFAULT_PACKAGE])
360 AC_SUBST(DEFAULT_PACKAGE)
364 dnl # Default SPL user configuration
366 AC_DEFUN([SPL_AC_PACKAGE], [
370 SPL_AC_DEFAULT_PACKAGE
373 AC_DEFUN([SPL_AC_LICENSE], [
374 AC_MSG_CHECKING([spl license])
376 AC_MSG_RESULT([$LICENSE])
377 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DHAVE_GPL_ONLY_SYMBOLS"
381 AC_DEFUN([SPL_AC_CONFIG], [
383 AC_ARG_WITH([config],
384 AS_HELP_STRING([--with-config=CONFIG],
385 [Config file 'kernel|user|all|srpm']),
386 [SPL_CONFIG="$withval"])
388 AC_MSG_CHECKING([spl config])
389 AC_MSG_RESULT([$SPL_CONFIG]);
392 case "$SPL_CONFIG" in
393 kernel) SPL_AC_CONFIG_KERNEL ;;
394 user) SPL_AC_CONFIG_USER ;;
395 all) SPL_AC_CONFIG_KERNEL
396 SPL_AC_CONFIG_USER ;;
399 AC_MSG_RESULT([Error!])
400 AC_MSG_ERROR([Bad value "$SPL_CONFIG" for --with-config,
401 user kernel|user|all|srpm]) ;;
404 AM_CONDITIONAL([CONFIG_USER],
405 [test "$SPL_CONFIG" = user] ||
406 [test "$SPL_CONFIG" = all])
407 AM_CONDITIONAL([CONFIG_KERNEL],
408 [test "$SPL_CONFIG" = kernel] ||
409 [test "$SPL_CONFIG" = all])
413 dnl # Enable if the SPL should be compiled with internal debugging enabled.
414 dnl # By default this support is disabled.
416 AC_DEFUN([SPL_AC_DEBUG], [
417 AC_MSG_CHECKING([whether debugging is enabled])
418 AC_ARG_ENABLE([debug],
419 [AS_HELP_STRING([--enable-debug],
420 [Enable generic debug support @<:@default=no@:>@])],
424 AS_IF([test "x$enable_debug" = xyes],
426 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG -Werror"
427 DEBUG_CFLAGS="-DDEBUG -Werror"
430 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DNDEBUG"
431 DEBUG_CFLAGS="-DNDEBUG"
434 AC_SUBST(DEBUG_CFLAGS)
435 AC_MSG_RESULT([$enable_debug])
439 dnl # Enabled by default it provides a minimal level of memory tracking.
440 dnl # A total count of bytes allocated is kept for each alloc and free.
441 dnl # Then at module unload time a report to the console will be printed
442 dnl # if memory was leaked. Additionally, /proc/spl/kmem/slab will exist
443 dnl # and provide an easy way to inspect the kmem based slab.
445 AC_DEFUN([SPL_AC_DEBUG_KMEM], [
446 AC_ARG_ENABLE([debug-kmem],
447 [AS_HELP_STRING([--enable-debug-kmem],
448 [Enable basic kmem accounting @<:@default=yes@:>@])],
450 [enable_debug_kmem=yes])
452 AS_IF([test "x$enable_debug_kmem" = xyes],
453 [AC_DEFINE([DEBUG_KMEM], [1],
454 [Define to 1 to enable basic kmem accounting])
455 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_KMEM"])
457 AC_MSG_CHECKING([whether basic kmem accounting is enabled])
458 AC_MSG_RESULT([$enable_debug_kmem])
462 dnl # Disabled by default it provides detailed memory tracking. This
463 dnl # feature also requires --enable-debug-kmem to be set. When enabled
464 dnl # not only will total bytes be tracked but also the location of every
465 dnl # alloc and free. When the SPL module is unloaded a list of all leaked
466 dnl # addresses and where they were allocated will be dumped to the console.
467 dnl # Enabling this feature has a significant impact on performance but it
468 dnl # makes finding memory leaks pretty straight forward.
470 AC_DEFUN([SPL_AC_DEBUG_KMEM_TRACKING], [
471 AC_ARG_ENABLE([debug-kmem-tracking],
472 [AS_HELP_STRING([--enable-debug-kmem-tracking],
473 [Enable detailed kmem tracking @<:@default=no@:>@])],
475 [enable_debug_kmem_tracking=no])
477 AS_IF([test "x$enable_debug_kmem_tracking" = xyes],
478 [AC_DEFINE([DEBUG_KMEM_TRACKING], [1],
479 [Define to 1 to enable detailed kmem tracking])
480 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_KMEM_TRACKING"])
482 AC_MSG_CHECKING([whether detailed kmem tracking is enabled])
483 AC_MSG_RESULT([$enable_debug_kmem_tracking])
487 dnl # SPL_LINUX_CONFTEST
489 AC_DEFUN([SPL_LINUX_CONFTEST], [
490 cat confdefs.h - <<_ACEOF >conftest.c
496 dnl # SPL_LANG_PROGRAM(C)([PROLOGUE], [BODY])
498 m4_define([SPL_LANG_PROGRAM], [
503 dnl Do *not* indent the following line: there may be CPP directives.
504 dnl Don't move the `;' right after for the same reason.
512 dnl # SPL_LINUX_COMPILE_IFELSE / like AC_COMPILE_IFELSE
514 AC_DEFUN([SPL_LINUX_COMPILE_IFELSE], [
515 m4_ifvaln([$1], [SPL_LINUX_CONFTEST([$1])])
516 rm -Rf build && mkdir -p build
517 echo "obj-m := conftest.o" >build/Makefile
519 [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])],
521 [_AC_MSG_LOG_CONFTEST m4_ifvaln([$5],[$5])]
527 dnl # SPL_LINUX_TRY_COMPILE like AC_TRY_COMPILE
529 AC_DEFUN([SPL_LINUX_TRY_COMPILE],
530 [SPL_LINUX_COMPILE_IFELSE(
531 [AC_LANG_SOURCE([SPL_LANG_PROGRAM([[$1]], [[$2]])])],
533 [test -s build/conftest.o],
538 dnl # SPL_LINUX_CONFIG
540 AC_DEFUN([SPL_LINUX_CONFIG],
541 [AC_MSG_CHECKING([whether Linux was built with CONFIG_$1])
542 SPL_LINUX_TRY_COMPILE([
543 #ifndef AUTOCONF_INCLUDED
544 #include <linux/config.h>
548 #error CONFIG_$1 not #defined
560 dnl # SPL_CHECK_SYMBOL_EXPORT
561 dnl # check symbol exported or not
563 AC_DEFUN([SPL_CHECK_SYMBOL_EXPORT],
564 [AC_MSG_CHECKING([whether symbol $1 is exported])
565 grep -q -E '[[[:space:]]]$1[[[:space:]]]' \
566 $LINUX_OBJ/Module*.symvers 2>/dev/null
568 if test $rc -ne 0; then
571 grep -q -E "EXPORT_SYMBOL.*($1)" \
572 "$LINUX_OBJ/$file" 2>/dev/null
574 if test $rc -eq 0; then
579 if test $export -eq 0; then
593 dnl # SPL_CHECK_HEADER
594 dnl # check whether header exists and define HAVE_$2_HEADER
596 AC_DEFUN([SPL_CHECK_HEADER],
597 [AC_MSG_CHECKING([whether header $1 exists])
598 SPL_LINUX_TRY_COMPILE([
603 AC_DEFINE(HAVE_$2_HEADER, 1, [$1 exists])
613 dnl # Use the atomic implemenation based on global spinlocks. This
614 dnl # should only be needed by 32-bit kernels which do not provide
615 dnl # the atomic64_* API. It may be optionally enabled as a fallback
616 dnl # if problems are observed with the direct mapping to the native
617 dnl # Linux atomic operations. You may not disable atomic spinlocks
618 dnl # if you kernel does not an atomic64_* API.
620 AC_DEFUN([SPL_AC_ATOMIC_SPINLOCK], [
621 AC_ARG_ENABLE([atomic-spinlocks],
622 [AS_HELP_STRING([--enable-atomic-spinlocks],
623 [Atomic types use spinlocks @<:@default=check@:>@])],
625 [enable_atomic_spinlocks=check])
627 SPL_LINUX_TRY_COMPILE([
628 #include <asm/atomic.h>
633 AC_DEFINE(HAVE_ATOMIC64_T, 1,
634 [kernel defines atomic64_t])
639 AS_IF([test "x$enable_atomic_spinlocks" = xcheck], [
640 AS_IF([test "x$have_atomic64_t" = xyes], [
641 enable_atomic_spinlocks=no
643 enable_atomic_spinlocks=yes
647 AS_IF([test "x$enable_atomic_spinlocks" = xyes], [
648 AC_DEFINE([ATOMIC_SPINLOCK], [1],
649 [Atomic types use spinlocks])
651 AS_IF([test "x$have_atomic64_t" = xno], [
653 [--disable-atomic-spinlocks given but required atomic64 support is unavailable])
657 AC_MSG_CHECKING([whether atomic types use spinlocks])
658 AC_MSG_RESULT([$enable_atomic_spinlocks])
660 AC_MSG_CHECKING([whether kernel defines atomic64_t])
661 AC_MSG_RESULT([$have_atomic64_t])
665 dnl # 2.6.24 API change,
666 dnl # check if atomic64_cmpxchg is defined
668 AC_DEFUN([SPL_AC_TYPE_ATOMIC64_CMPXCHG],
669 [AC_MSG_CHECKING([whether kernel defines atomic64_cmpxchg])
670 SPL_LINUX_TRY_COMPILE([
671 #include <asm/atomic.h>
672 #include <asm/system.h>
674 atomic64_cmpxchg((atomic64_t *)NULL, 0, 0);
677 AC_DEFINE(HAVE_ATOMIC64_CMPXCHG, 1,
678 [kernel defines atomic64_cmpxchg])
685 dnl # 2.6.24 API change,
686 dnl # check if atomic64_xchg is defined
688 AC_DEFUN([SPL_AC_TYPE_ATOMIC64_XCHG],
689 [AC_MSG_CHECKING([whether kernel defines atomic64_xchg])
690 SPL_LINUX_TRY_COMPILE([
691 #include <asm/atomic.h>
693 atomic64_xchg((atomic64_t *)NULL, 0);
696 AC_DEFINE(HAVE_ATOMIC64_XCHG, 1,
697 [kernel defines atomic64_xchg])
704 dnl # 2.6.24 API change,
705 dnl # check if uintptr_t typedef is defined
707 AC_DEFUN([SPL_AC_TYPE_UINTPTR_T],
708 [AC_MSG_CHECKING([whether kernel defines uintptr_t])
709 SPL_LINUX_TRY_COMPILE([
710 #include <linux/types.h>
715 AC_DEFINE(HAVE_UINTPTR_T, 1,
716 [kernel defines uintptr_t])
723 dnl # 2.6.20 API change,
724 dnl # INIT_WORK use 2 args and not store data inside
726 AC_DEFUN([SPL_AC_3ARGS_INIT_WORK],
727 [AC_MSG_CHECKING([whether INIT_WORK wants 3 args])
728 SPL_LINUX_TRY_COMPILE([
729 #include <linux/workqueue.h>
731 struct work_struct work;
732 INIT_WORK(&work, NULL, NULL);
735 AC_DEFINE(HAVE_3ARGS_INIT_WORK, 1,
736 [INIT_WORK wants 3 args])
743 dnl # 2.6.21 API change,
744 dnl # 'register_sysctl_table' use only one argument instead of two
746 AC_DEFUN([SPL_AC_2ARGS_REGISTER_SYSCTL],
747 [AC_MSG_CHECKING([whether register_sysctl_table() wants 2 args])
748 SPL_LINUX_TRY_COMPILE([
749 #include <linux/sysctl.h>
751 return register_sysctl_table(NULL,0);
754 AC_DEFINE(HAVE_2ARGS_REGISTER_SYSCTL, 1,
755 [register_sysctl_table() wants 2 args])
762 dnl # 2.6.23 API change
763 dnl # Old set_shrinker API replaced with register_shrinker
765 AC_DEFUN([SPL_AC_SET_SHRINKER], [
766 AC_MSG_CHECKING([whether set_shrinker() available])
767 SPL_LINUX_TRY_COMPILE([
768 #include <linux/mm.h>
770 return set_shrinker(DEFAULT_SEEKS, NULL);
773 AC_DEFINE(HAVE_SET_SHRINKER, 1,
774 [set_shrinker() available])
781 dnl # 2.6.35 API change,
782 dnl # Add context to shrinker callback
784 AC_DEFUN([SPL_AC_3ARGS_SHRINKER_CALLBACK],
785 [AC_MSG_CHECKING([whether shrinker callback wants 3 args])
786 tmp_flags="$EXTRA_KCFLAGS"
787 EXTRA_KCFLAGS="-Werror"
788 SPL_LINUX_TRY_COMPILE([
789 #include <linux/mm.h>
791 int shrinker_cb(struct shrinker *, int, unsigned int);
793 struct shrinker cache_shrinker = {
794 .shrink = shrinker_cb,
795 .seeks = DEFAULT_SEEKS,
797 register_shrinker(&cache_shrinker);
800 AC_DEFINE(HAVE_3ARGS_SHRINKER_CALLBACK, 1,
801 [shrinker callback wants 3 args])
805 EXTRA_KCFLAGS="$tmp_flags"
809 dnl # 2.6.25 API change,
810 dnl # struct path entry added to struct nameidata
812 AC_DEFUN([SPL_AC_PATH_IN_NAMEIDATA],
813 [AC_MSG_CHECKING([whether struct path used in struct nameidata])
814 SPL_LINUX_TRY_COMPILE([
815 #include <linux/namei.h>
820 nd.path.dentry = NULL;
823 AC_DEFINE(HAVE_PATH_IN_NAMEIDATA, 1,
824 [struct path used in struct nameidata])
831 dnl # Custom SPL patch may export this system it is not required
833 AC_DEFUN([SPL_AC_TASK_CURR], [
834 SPL_CHECK_SYMBOL_EXPORT([task_curr], [kernel/sched.c],
835 [AC_DEFINE(HAVE_TASK_CURR, 1, [task_curr() exported])],
840 dnl # 2.6.19 API change,
841 dnl # Use CTL_UNNUMBERED when binary sysctl is not required
843 AC_DEFUN([SPL_AC_CTL_UNNUMBERED],
844 [AC_MSG_CHECKING([whether unnumbered sysctl support exists])
845 SPL_LINUX_TRY_COMPILE([
846 #include <linux/sysctl.h>
848 #ifndef CTL_UNNUMBERED
849 #error CTL_UNNUMBERED undefined
853 AC_DEFINE(HAVE_CTL_UNNUMBERED, 1,
854 [unnumbered sysctl support exists])
861 dnl # 2.6.33 API change,
862 dnl # Removed .ctl_name from struct ctl_table.
864 AC_DEFUN([SPL_AC_CTL_NAME], [
865 AC_MSG_CHECKING([whether struct ctl_table has ctl_name])
866 SPL_LINUX_TRY_COMPILE([
867 #include <linux/sysctl.h>
869 struct ctl_table ctl;
873 AC_DEFINE(HAVE_CTL_NAME, 1, [struct ctl_table has ctl_name])
880 dnl # 2.6.16 API change.
881 dnl # Check if 'fls64()' is available
883 AC_DEFUN([SPL_AC_FLS64],
884 [AC_MSG_CHECKING([whether fls64() is available])
885 SPL_LINUX_TRY_COMPILE([
886 #include <linux/bitops.h>
891 AC_DEFINE(HAVE_FLS64, 1, [fls64() is available])
898 dnl # 2.6.18 API change, check whether device_create() is available.
899 dnl # Device_create() was introduced in 2.6.18 and depricated
900 dnl # class_device_create() which was fully removed in 2.6.26.
902 AC_DEFUN([SPL_AC_DEVICE_CREATE], [
903 SPL_CHECK_SYMBOL_EXPORT(
905 [drivers/base/core.c],
906 [AC_DEFINE(HAVE_DEVICE_CREATE, 1,
907 [device_create() is available])],
912 dnl # 2.6.27 API change,
913 dnl # device_create() uses 5 args, new 'drvdata' argument.
915 AC_DEFUN([SPL_AC_5ARGS_DEVICE_CREATE], [
916 AC_MSG_CHECKING([whether device_create() wants 5 args])
917 tmp_flags="$EXTRA_KCFLAGS"
918 EXTRA_KCFLAGS="-Werror"
919 SPL_LINUX_TRY_COMPILE([
920 #include <linux/device.h>
922 device_create(NULL, NULL, 0, NULL, "%d", 1);
925 AC_DEFINE(HAVE_5ARGS_DEVICE_CREATE, 1,
926 [device_create wants 5 args])
930 EXTRA_KCFLAGS="$tmp_flags"
934 dnl # 2.6.13 API change, check whether class_device_create() is available.
935 dnl # Class_device_create() was introduced in 2.6.13 and depricated
936 dnl # class_simple_device_add() which was fully removed in 2.6.13.
938 AC_DEFUN([SPL_AC_CLASS_DEVICE_CREATE], [
939 SPL_CHECK_SYMBOL_EXPORT(
940 [class_device_create],
941 [drivers/base/class.c],
942 [AC_DEFINE(HAVE_CLASS_DEVICE_CREATE, 1,
943 [class_device_create() is available])],
948 dnl # 2.6.26 API change, set_normalized_timespec() is exported.
950 AC_DEFUN([SPL_AC_SET_NORMALIZED_TIMESPEC_EXPORT], [
951 SPL_CHECK_SYMBOL_EXPORT(
952 [set_normalized_timespec],
954 [AC_DEFINE(HAVE_SET_NORMALIZED_TIMESPEC_EXPORT, 1,
955 [set_normalized_timespec() is available as export])],
960 dnl # 2.6.16 API change, set_normalize_timespec() moved to time.c
961 dnl # previously it was available in time.h as an inline.
963 AC_DEFUN([SPL_AC_SET_NORMALIZED_TIMESPEC_INLINE], [
964 AC_MSG_CHECKING([whether set_normalized_timespec() is an inline])
965 SPL_LINUX_TRY_COMPILE([
966 #include <linux/time.h>
967 void set_normalized_timespec(struct timespec *ts,
968 time_t sec, long nsec) { }
975 AC_DEFINE(HAVE_SET_NORMALIZED_TIMESPEC_INLINE, 1,
976 [set_normalized_timespec() is available as inline])
981 dnl # 2.6.18 API change,
982 dnl # timespec_sub() inline function available in linux/time.h
984 AC_DEFUN([SPL_AC_TIMESPEC_SUB], [
985 AC_MSG_CHECKING([whether timespec_sub() is available])
986 SPL_LINUX_TRY_COMPILE([
987 #include <linux/time.h>
989 struct timespec a, b, c = { 0 };
990 c = timespec_sub(a, b);
993 AC_DEFINE(HAVE_TIMESPEC_SUB, 1, [timespec_sub() is available])
1000 dnl # 2.6.19 API change,
1001 dnl # check if init_utsname() is available in linux/utsname.h
1003 AC_DEFUN([SPL_AC_INIT_UTSNAME], [
1004 AC_MSG_CHECKING([whether init_utsname() is available])
1005 SPL_LINUX_TRY_COMPILE([
1006 #include <linux/utsname.h>
1008 struct new_utsname *a = init_utsname();
1011 AC_DEFINE(HAVE_INIT_UTSNAME, 1, [init_utsname() is available])
1018 dnl # 2.6.26 API change,
1019 dnl # definition of struct fdtable relocated to linux/fdtable.h
1021 AC_DEFUN([SPL_AC_FDTABLE_HEADER], [
1022 SPL_CHECK_HEADER([linux/fdtable.h], [FDTABLE], [], [])
1026 dnl # 2.6.14 API change,
1027 dnl # check whether 'files_fdtable()' exists
1029 AC_DEFUN([SPL_AC_FILES_FDTABLE], [
1030 AC_MSG_CHECKING([whether files_fdtable() is available])
1031 SPL_LINUX_TRY_COMPILE([
1032 #include <linux/sched.h>
1033 #include <linux/file.h>
1034 #ifdef HAVE_FDTABLE_HEADER
1035 #include <linux/fdtable.h>
1038 struct files_struct *files = current->files;
1039 struct fdtable *fdt = files_fdtable(files);
1042 AC_DEFINE(HAVE_FILES_FDTABLE, 1, [files_fdtable() is available])
1049 dnl # 2.6.18 API change,
1050 dnl # added linux/uaccess.h
1052 AC_DEFUN([SPL_AC_UACCESS_HEADER], [
1053 SPL_CHECK_HEADER([linux/uaccess.h], [UACCESS], [], [])
1057 dnl # 2.6.12 API change,
1058 dnl # check whether 'kmalloc_node()' is available.
1060 AC_DEFUN([SPL_AC_KMALLOC_NODE], [
1061 AC_MSG_CHECKING([whether kmalloc_node() is available])
1062 SPL_LINUX_TRY_COMPILE([
1063 #include <linux/slab.h>
1065 void *a = kmalloc_node(1, GFP_KERNEL, 0);
1068 AC_DEFINE(HAVE_KMALLOC_NODE, 1, [kmalloc_node() is available])
1075 dnl # 2.6.9 API change,
1076 dnl # check whether 'monotonic_clock()' is available it may
1077 dnl # be available for some archs but not others.
1079 AC_DEFUN([SPL_AC_MONOTONIC_CLOCK], [
1080 SPL_CHECK_SYMBOL_EXPORT(
1083 [AC_DEFINE(HAVE_MONOTONIC_CLOCK, 1,
1084 [monotonic_clock() is available])],
1089 dnl # 2.6.16 API change,
1090 dnl # check whether 'struct inode' has i_mutex
1092 AC_DEFUN([SPL_AC_INODE_I_MUTEX], [
1093 AC_MSG_CHECKING([whether struct inode has i_mutex])
1094 SPL_LINUX_TRY_COMPILE([
1095 #include <linux/fs.h>
1096 #include <linux/mutex.h>
1099 mutex_init(&i.i_mutex);
1102 AC_DEFINE(HAVE_INODE_I_MUTEX, 1, [struct inode has i_mutex])
1109 dnl # 2.6.29 API change,
1110 dnl # Adaptive mutexs introduced.
1112 AC_DEFUN([SPL_AC_MUTEX_OWNER], [
1113 AC_MSG_CHECKING([whether struct mutex has owner])
1114 SPL_LINUX_TRY_COMPILE([
1115 #include <linux/mutex.h>
1121 AC_DEFINE(HAVE_MUTEX_OWNER, 1, [struct mutex has owner])
1128 dnl # 2.6.18 API change,
1129 dnl # First introduced 'mutex_lock_nested()' in include/linux/mutex.h,
1130 dnl # as part of the mutex validator. Fallback to using 'mutex_lock()'
1131 dnl # if the mutex validator is disabled or otherwise unavailable.
1133 AC_DEFUN([SPL_AC_MUTEX_LOCK_NESTED], [
1134 AC_MSG_CHECKING([whether mutex_lock_nested() is available])
1135 SPL_LINUX_TRY_COMPILE([
1136 #include <linux/mutex.h>
1140 mutex_lock_nested(&mutex, 0);
1143 AC_DEFINE(HAVE_MUTEX_LOCK_NESTED, 1,
1144 [mutex_lock_nested() is available])
1151 dnl # 2.6.27 API change,
1152 dnl # on_each_cpu() uses 3 args, no 'retry' argument
1154 AC_DEFUN([SPL_AC_3ARGS_ON_EACH_CPU], [
1155 AC_MSG_CHECKING([whether on_each_cpu() wants 3 args])
1156 SPL_LINUX_TRY_COMPILE([
1157 #include <linux/smp.h>
1159 on_each_cpu(NULL, NULL, 0);
1162 AC_DEFINE(HAVE_3ARGS_ON_EACH_CPU, 1,
1163 [on_each_cpu wants 3 args])
1170 dnl # 2.6.18 API change,
1171 dnl # kallsyms_lookup_name no longer exported
1173 AC_DEFUN([SPL_AC_KALLSYMS_LOOKUP_NAME], [
1174 SPL_CHECK_SYMBOL_EXPORT(
1175 [kallsyms_lookup_name],
1177 [AC_DEFINE(HAVE_KALLSYMS_LOOKUP_NAME, 1,
1178 [kallsyms_lookup_name() is available])],
1183 dnl # Proposed API change,
1184 dnl # This symbol is not available in stock kernels. You may build a
1185 dnl # custom kernel with the *-spl-export-symbols.patch which will export
1186 dnl # these symbols for use. If your already rolling a custom kernel for
1187 dnl # your environment this is recommended.
1189 AC_DEFUN([SPL_AC_GET_VMALLOC_INFO], [
1190 SPL_CHECK_SYMBOL_EXPORT(
1193 [AC_DEFINE(HAVE_GET_VMALLOC_INFO, 1,
1194 [get_vmalloc_info() is available])],
1199 dnl # 2.6.17 API change
1200 dnl # The helper functions first_online_pgdat(), next_online_pgdat(), and
1201 dnl # next_zone() are introduced to simplify for_each_zone(). These symbols
1202 dnl # were exported in 2.6.17 for use by modules which was consistent with
1203 dnl # the previous implementation of for_each_zone(). From 2.6.18 - 2.6.19
1204 dnl # the symbols were exported as 'unused', and by 2.6.20 they exports
1205 dnl # were dropped entirely leaving modules no way to directly iterate over
1206 dnl # the zone list. Because we need access to the zone helpers we check
1207 dnl # if the kernel contains the old or new implementation. Then we check
1208 dnl # to see if the symbols we need for each version are available. If they
1209 dnl # are not, dynamically aquire the addresses with kallsyms_lookup_name().
1211 AC_DEFUN([SPL_AC_PGDAT_HELPERS], [
1212 AC_MSG_CHECKING([whether symbol *_pgdat exist])
1213 grep -q -E 'first_online_pgdat' $LINUX/include/linux/mmzone.h 2>/dev/null
1215 if test $rc -eq 0; then
1216 AC_MSG_RESULT([yes])
1217 AC_DEFINE(HAVE_PGDAT_HELPERS, 1, [pgdat helpers are available])
1224 dnl # Proposed API change,
1225 dnl # This symbol is not available in stock kernels. You may build a
1226 dnl # custom kernel with the *-spl-export-symbols.patch which will export
1227 dnl # these symbols for use. If your already rolling a custom kernel for
1228 dnl # your environment this is recommended.
1230 AC_DEFUN([SPL_AC_FIRST_ONLINE_PGDAT], [
1231 SPL_CHECK_SYMBOL_EXPORT(
1232 [first_online_pgdat],
1234 [AC_DEFINE(HAVE_FIRST_ONLINE_PGDAT, 1,
1235 [first_online_pgdat() is available])],
1240 dnl # Proposed API change,
1241 dnl # This symbol is not available in stock kernels. You may build a
1242 dnl # custom kernel with the *-spl-export-symbols.patch which will export
1243 dnl # these symbols for use. If your already rolling a custom kernel for
1244 dnl # your environment this is recommended.
1246 AC_DEFUN([SPL_AC_NEXT_ONLINE_PGDAT], [
1247 SPL_CHECK_SYMBOL_EXPORT(
1248 [next_online_pgdat],
1250 [AC_DEFINE(HAVE_NEXT_ONLINE_PGDAT, 1,
1251 [next_online_pgdat() is available])],
1256 dnl # Proposed API change,
1257 dnl # This symbol is not available in stock kernels. You may build a
1258 dnl # custom kernel with the *-spl-export-symbols.patch which will export
1259 dnl # these symbols for use. If your already rolling a custom kernel for
1260 dnl # your environment this is recommended.
1262 AC_DEFUN([SPL_AC_NEXT_ZONE], [
1263 SPL_CHECK_SYMBOL_EXPORT(
1266 [AC_DEFINE(HAVE_NEXT_ZONE, 1,
1267 [next_zone() is available])],
1272 dnl # 2.6.17 API change,
1273 dnl # See SPL_AC_PGDAT_HELPERS for details.
1275 AC_DEFUN([SPL_AC_PGDAT_LIST], [
1276 SPL_CHECK_SYMBOL_EXPORT(
1279 [AC_DEFINE(HAVE_PGDAT_LIST, 1,
1280 [pgdat_list is available])],
1285 dnl # 2.6.18 API change,
1286 dnl # First introduced global_page_state() support as an inline.
1288 AC_DEFUN([SPL_AC_GLOBAL_PAGE_STATE], [
1289 AC_MSG_CHECKING([whether global_page_state() is available])
1290 SPL_LINUX_TRY_COMPILE([
1291 #include <linux/mm.h>
1293 unsigned long state;
1294 state = global_page_state(0);
1297 AC_DEFINE(HAVE_GLOBAL_PAGE_STATE, 1,
1298 [global_page_state() is available])
1305 dnl # 2.6.21 API change (plus subsequent naming convention changes),
1306 dnl # Public global zone stats now include a free page count. However
1307 dnl # the enumerated names of the counters have changed since this API
1308 dnl # was introduced. We need to deduce the corrent name to use. This
1309 dnl # replaces the priviate get_zone_counts() interface.
1311 dnl # NR_FREE_PAGES was available from 2.6.21 to current kernels, which
1312 dnl # is 2.6.30 as of when this was written.
1314 AC_DEFUN([SPL_AC_ZONE_STAT_ITEM_FREE], [
1315 AC_MSG_CHECKING([whether page state NR_FREE_PAGES is available])
1316 SPL_LINUX_TRY_COMPILE([
1317 #include <linux/mm.h>
1319 enum zone_stat_item zsi;
1320 zsi = NR_FREE_PAGES;
1323 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_FREE_PAGES, 1,
1324 [Page state NR_FREE_PAGES is available])
1331 dnl # 2.6.21 API change (plus subsequent naming convention changes),
1332 dnl # Public global zone stats now include an inactive page count. However
1333 dnl # the enumerated names of the counters have changed since this API
1334 dnl # was introduced. We need to deduce the corrent name to use. This
1335 dnl # replaces the priviate get_zone_counts() interface.
1337 dnl # NR_INACTIVE was available from 2.6.21 to 2.6.27 and included both
1338 dnl # anonymous and file inactive pages. As of 2.6.28 it was split in
1339 dnl # to NR_INACTIVE_ANON and NR_INACTIVE_FILE.
1341 AC_DEFUN([SPL_AC_ZONE_STAT_ITEM_INACTIVE], [
1342 AC_MSG_CHECKING([whether page state NR_INACTIVE is available])
1343 SPL_LINUX_TRY_COMPILE([
1344 #include <linux/mm.h>
1346 enum zone_stat_item zsi;
1350 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_INACTIVE, 1,
1351 [Page state NR_INACTIVE is available])
1356 AC_MSG_CHECKING([whether page state NR_INACTIVE_ANON is available])
1357 SPL_LINUX_TRY_COMPILE([
1358 #include <linux/mm.h>
1360 enum zone_stat_item zsi;
1361 zsi = NR_INACTIVE_ANON;
1364 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_ANON, 1,
1365 [Page state NR_INACTIVE_ANON is available])
1370 AC_MSG_CHECKING([whether page state NR_INACTIVE_FILE is available])
1371 SPL_LINUX_TRY_COMPILE([
1372 #include <linux/mm.h>
1374 enum zone_stat_item zsi;
1375 zsi = NR_INACTIVE_FILE;
1378 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_FILE, 1,
1379 [Page state NR_INACTIVE_FILE is available])
1386 dnl # 2.6.21 API change (plus subsequent naming convention changes),
1387 dnl # Public global zone stats now include an active page count. However
1388 dnl # the enumerated names of the counters have changed since this API
1389 dnl # was introduced. We need to deduce the corrent name to use. This
1390 dnl # replaces the priviate get_zone_counts() interface.
1392 dnl # NR_ACTIVE was available from 2.6.21 to 2.6.27 and included both
1393 dnl # anonymous and file active pages. As of 2.6.28 it was split in
1394 dnl # to NR_ACTIVE_ANON and NR_ACTIVE_FILE.
1396 AC_DEFUN([SPL_AC_ZONE_STAT_ITEM_ACTIVE], [
1397 AC_MSG_CHECKING([whether page state NR_ACTIVE is available])
1398 SPL_LINUX_TRY_COMPILE([
1399 #include <linux/mm.h>
1401 enum zone_stat_item zsi;
1405 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_ACTIVE, 1,
1406 [Page state NR_ACTIVE is available])
1411 AC_MSG_CHECKING([whether page state NR_ACTIVE_ANON is available])
1412 SPL_LINUX_TRY_COMPILE([
1413 #include <linux/mm.h>
1415 enum zone_stat_item zsi;
1416 zsi = NR_ACTIVE_ANON;
1419 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_ANON, 1,
1420 [Page state NR_ACTIVE_ANON is available])
1425 AC_MSG_CHECKING([whether page state NR_ACTIVE_FILE is available])
1426 SPL_LINUX_TRY_COMPILE([
1427 #include <linux/mm.h>
1429 enum zone_stat_item zsi;
1430 zsi = NR_ACTIVE_FILE;
1433 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_FILE, 1,
1434 [Page state NR_ACTIVE_FILE is available])
1441 dnl # Proposed API change for legacy kernels.
1442 dnl # This symbol is not available in older kernels. For kernels post
1443 dnl # 2.6.21 the global_page_state() API is used to get free/inactive/active
1444 dnl # page state information. This symbol is only used in legacy kernels
1445 dnl # any only as a last resort.
1447 AC_DEFUN([SPL_AC_GET_ZONE_COUNTS], [
1448 AC_MSG_CHECKING([whether symbol get_zone_counts is needed])
1449 SPL_LINUX_TRY_COMPILE([
1451 #if !defined(HAVE_ZONE_STAT_ITEM_NR_FREE_PAGES)
1452 #error "global_page_state needs NR_FREE_PAGES"
1455 #if !defined(HAVE_ZONE_STAT_ITEM_NR_ACTIVE) && \
1456 !defined(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_ANON) && \
1457 !defined(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_FILE)
1458 #error "global_page_state needs NR_ACTIVE*"
1461 #if !defined(HAVE_ZONE_STAT_ITEM_NR_INACTIVE) && \
1462 !defined(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_ANON) && \
1463 !defined(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_FILE)
1464 #error "global_page_state needs NR_INACTIVE*"
1470 AC_DEFINE(NEED_GET_ZONE_COUNTS, 1,
1471 [get_zone_counts() is needed])
1473 SPL_CHECK_SYMBOL_EXPORT(
1476 [AC_DEFINE(HAVE_GET_ZONE_COUNTS, 1,
1477 [get_zone_counts() is available])],
1483 dnl # 2.6.27 API change,
1484 dnl # The user_path_dir() replaces __user_walk()
1486 AC_DEFUN([SPL_AC_USER_PATH_DIR], [
1487 SPL_CHECK_SYMBOL_EXPORT(
1490 [AC_DEFINE(HAVE_USER_PATH_DIR, 1,
1491 [user_path_dir() is available])],
1496 dnl # Symbol available in RHEL kernels not in stock kernels.
1498 AC_DEFUN([SPL_AC_SET_FS_PWD], [
1499 SPL_CHECK_SYMBOL_EXPORT(
1502 [AC_DEFINE(HAVE_SET_FS_PWD, 1,
1503 [set_fs_pwd() is available])],
1508 dnl # 2.6.25 API change,
1509 dnl # Simplied API by replacing mnt+dentry args with a single path arg.
1511 AC_DEFUN([SPL_AC_2ARGS_SET_FS_PWD],
1512 [AC_MSG_CHECKING([whether set_fs_pwd() wants 2 args])
1513 SPL_LINUX_TRY_COMPILE([
1514 #include <linux/sched.h>
1515 #include <linux/fs_struct.h>
1517 set_fs_pwd(NULL, NULL);
1520 AC_DEFINE(HAVE_2ARGS_SET_FS_PWD, 1,
1521 [set_fs_pwd() wants 2 args])
1528 dnl # SLES API change, never adopted in mainline,
1529 dnl # Third 'struct vfsmount *' argument removed.
1531 AC_DEFUN([SPL_AC_2ARGS_VFS_UNLINK],
1532 [AC_MSG_CHECKING([whether vfs_unlink() wants 2 args])
1533 SPL_LINUX_TRY_COMPILE([
1534 #include <linux/fs.h>
1536 vfs_unlink(NULL, NULL);
1539 AC_DEFINE(HAVE_2ARGS_VFS_UNLINK, 1,
1540 [vfs_unlink() wants 2 args])
1547 dnl # SLES API change, never adopted in mainline,
1548 dnl # Third and sixth 'struct vfsmount *' argument removed.
1550 AC_DEFUN([SPL_AC_4ARGS_VFS_RENAME],
1551 [AC_MSG_CHECKING([whether vfs_rename() wants 4 args])
1552 SPL_LINUX_TRY_COMPILE([
1553 #include <linux/fs.h>
1555 vfs_rename(NULL, NULL, NULL, NULL);
1558 AC_DEFINE(HAVE_4ARGS_VFS_RENAME, 1,
1559 [vfs_rename() wants 4 args])
1566 dnl # 2.6.36 API change,
1567 dnl # The 'struct fs_struct->lock' was changed from a rwlock_t to
1568 dnl # a spinlock_t to improve the fastpath performance.
1570 AC_DEFUN([SPL_AC_FS_STRUCT_SPINLOCK], [
1571 AC_MSG_CHECKING([whether struct fs_struct uses spinlock_t])
1572 SPL_LINUX_TRY_COMPILE([
1573 #include <linux/sched.h>
1574 #include <linux/fs_struct.h>
1576 struct fs_struct fs;
1577 spin_lock_init(&fs.lock);
1580 AC_DEFINE(HAVE_FS_STRUCT_SPINLOCK, 1,
1581 [struct fs_struct uses spinlock_t])
1588 dnl # 2.6.29 API change,
1589 dnl # check whether 'struct cred' exists
1591 AC_DEFUN([SPL_AC_CRED_STRUCT], [
1592 AC_MSG_CHECKING([whether struct cred exists])
1593 SPL_LINUX_TRY_COMPILE([
1594 #include <linux/cred.h>
1600 AC_DEFINE(HAVE_CRED_STRUCT, 1, [struct cred exists])
1607 dnl # Custom SPL patch may export this symbol.
1609 AC_DEFUN([SPL_AC_GROUPS_SEARCH], [
1610 SPL_CHECK_SYMBOL_EXPORT(
1613 [AC_DEFINE(HAVE_GROUPS_SEARCH, 1,
1614 [groups_search() is available])],
1619 dnl # 2.6.x API change,
1620 dnl # __put_task_struct() was exported in RHEL5 but unavailable elsewhere.
1622 AC_DEFUN([SPL_AC_PUT_TASK_STRUCT], [
1623 SPL_CHECK_SYMBOL_EXPORT(
1624 [__put_task_struct],
1626 [AC_DEFINE(HAVE_PUT_TASK_STRUCT, 1,
1627 [__put_task_struct() is available])],
1632 dnl # 2.6.32 API change,
1633 dnl # Unused 'struct file *' removed from prototype.
1635 AC_DEFUN([SPL_AC_5ARGS_PROC_HANDLER], [
1636 AC_MSG_CHECKING([whether proc_handler() wants 5 args])
1637 SPL_LINUX_TRY_COMPILE([
1638 #include <linux/sysctl.h>
1640 proc_dostring(NULL, 0, NULL, NULL, NULL);
1643 AC_DEFINE(HAVE_5ARGS_PROC_HANDLER, 1,
1644 [proc_handler() wants 5 args])
1651 dnl # 2.6.x API change,
1652 dnl # kvasprintf() function added.
1654 AC_DEFUN([SPL_AC_KVASPRINTF], [
1655 SPL_CHECK_SYMBOL_EXPORT(
1658 [AC_DEFINE(HAVE_KVASPRINTF, 1,
1659 [kvasprintf() is available])],
1664 dnl # 2.6.35 API change,
1665 dnl # Unused 'struct dentry *' removed from prototype.
1667 AC_DEFUN([SPL_AC_3ARGS_FILE_FSYNC], [
1668 AC_MSG_CHECKING([whether file_fsync() wants 3 args])
1669 SPL_LINUX_TRY_COMPILE([
1670 #include <linux/buffer_head.h>
1672 file_fsync(NULL, NULL, 0);
1675 AC_DEFINE(HAVE_3ARGS_FILE_FSYNC, 1,
1676 [file_fsync() wants 3 args])
1683 dnl # 2.6.33 API change. Also backported in RHEL5 as of 2.6.18-190.el5.
1684 dnl # Earlier versions of rwsem_is_locked() were inline and had a race
1685 dnl # condition. The fixed version is exported as a symbol. The race
1686 dnl # condition is fixed by acquiring sem->wait_lock, so we must not
1687 dnl # call that version while holding sem->wait_lock.
1689 AC_DEFUN([SPL_AC_EXPORTED_RWSEM_IS_LOCKED], [
1690 SPL_CHECK_SYMBOL_EXPORT(
1692 [lib/rwsem-spinlock.c],
1693 [AC_DEFINE(RWSEM_IS_LOCKED_TAKES_WAIT_LOCK, 1,
1694 [rwsem_is_locked() acquires sem->wait_lock])],
1699 dnl # 2.6.37 API compat,
1700 dnl # The function invalidate_inodes() is no longer exported by the kernel.
1701 dnl # The prototype however is still available which means it is safe
1702 dnl # to acquire the symbol's address using spl_kallsyms_lookup_name().
1704 AC_DEFUN([SPL_AC_KERNEL_INVALIDATE_INODES], [
1705 SPL_CHECK_SYMBOL_EXPORT(
1706 [invalidate_inodes],
1708 [AC_DEFINE(HAVE_INVALIDATE_INODES, 1,
1709 [invalidate_inodes() is available])],