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], [
12 if test "${LINUX_OBJ}" != "${LINUX}"; then
13 KERNELMAKE_PARAMS="$KERNELMAKE_PARAMS O=$LINUX_OBJ"
15 AC_SUBST(KERNELMAKE_PARAMS)
17 KERNELCPPFLAGS="$KERNELCPPFLAGS -Wstrict-prototypes"
18 AC_SUBST(KERNELCPPFLAGS)
23 SPL_AC_DEBUG_KMEM_TRACKING
25 SPL_AC_ATOMIC_SPINLOCK
26 SPL_AC_TYPE_ATOMIC64_CMPXCHG
27 SPL_AC_TYPE_ATOMIC64_XCHG
29 SPL_AC_3ARGS_INIT_WORK
30 SPL_AC_2ARGS_REGISTER_SYSCTL
32 SPL_AC_3ARGS_SHRINKER_CALLBACK
33 SPL_AC_PATH_IN_NAMEIDATA
39 SPL_AC_5ARGS_DEVICE_CREATE
40 SPL_AC_CLASS_DEVICE_CREATE
41 SPL_AC_SET_NORMALIZED_TIMESPEC_EXPORT
42 SPL_AC_SET_NORMALIZED_TIMESPEC_INLINE
47 SPL_AC_CLEAR_CLOSE_ON_EXEC
50 SPL_AC_MONOTONIC_CLOCK
53 SPL_AC_MUTEX_OWNER_TASK_STRUCT
54 SPL_AC_MUTEX_LOCK_NESTED
55 SPL_AC_3ARGS_ON_EACH_CPU
56 SPL_AC_KALLSYMS_LOOKUP_NAME
57 SPL_AC_GET_VMALLOC_INFO
59 SPL_AC_FIRST_ONLINE_PGDAT
60 SPL_AC_NEXT_ONLINE_PGDAT
63 SPL_AC_GLOBAL_PAGE_STATE
64 SPL_AC_ZONE_STAT_ITEM_FREE
65 SPL_AC_ZONE_STAT_ITEM_INACTIVE
66 SPL_AC_ZONE_STAT_ITEM_ACTIVE
67 SPL_AC_GET_ZONE_COUNTS
70 SPL_AC_2ARGS_SET_FS_PWD
71 SPL_AC_2ARGS_VFS_UNLINK
72 SPL_AC_4ARGS_VFS_RENAME
74 SPL_AC_2ARGS_VFS_FSYNC
75 SPL_AC_FS_STRUCT_SPINLOCK
78 SPL_AC_PUT_TASK_STRUCT
79 SPL_AC_5ARGS_PROC_HANDLER
81 SPL_AC_EXPORTED_RWSEM_IS_LOCKED
82 SPL_AC_KERNEL_INVALIDATE_INODES
83 SPL_AC_KERNEL_2ARGS_INVALIDATE_INODES
84 SPL_AC_SHRINK_DCACHE_MEMORY
85 SPL_AC_SHRINK_ICACHE_MEMORY
86 SPL_AC_KERN_PATH_PARENT_HEADER
87 SPL_AC_KERN_PATH_PARENT_SYMBOL
88 SPL_AC_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE
89 SPL_AC_SHRINK_CONTROL_STRUCT
90 SPL_AC_RWSEM_SPINLOCK_IS_RAW
93 AC_DEFUN([SPL_AC_MODULE_SYMVERS], [
94 modpost=$LINUX/scripts/Makefile.modpost
95 AC_MSG_CHECKING([kernel file name for module symbols])
96 if test "x$enable_linux_builtin" != xyes -a -f "$modpost"; then
97 if grep -q Modules.symvers $modpost; then
98 LINUX_SYMBOLS=Modules.symvers
100 LINUX_SYMBOLS=Module.symvers
103 if ! test -f "$LINUX_OBJ/$LINUX_SYMBOLS"; then
105 *** Please make sure the kernel devel package for your distribution
106 *** is installed. If your building with a custom kernel make sure the
107 *** kernel is configured, built, and the '--with-linux=PATH' configure
108 *** option refers to the location of the kernel source.])
113 AC_MSG_RESULT($LINUX_SYMBOLS)
114 AC_SUBST(LINUX_SYMBOLS)
117 AC_DEFUN([SPL_AC_KERNEL], [
119 AS_HELP_STRING([--with-linux=PATH],
120 [Path to kernel source]),
121 [kernelsrc="$withval"])
123 AC_ARG_WITH([linux-obj],
124 AS_HELP_STRING([--with-linux-obj=PATH],
125 [Path to kernel build objects]),
126 [kernelbuild="$withval"])
128 AC_MSG_CHECKING([kernel source directory])
129 if test -z "$kernelsrc"; then
130 if test -e "/lib/modules/$(uname -r)/source"; then
131 headersdir="/lib/modules/$(uname -r)/source"
132 sourcelink=$(readlink -f "$headersdir")
133 elif test -e "/lib/modules/$(uname -r)/build"; then
134 headersdir="/lib/modules/$(uname -r)/build"
135 sourcelink=$(readlink -f "$headersdir")
137 sourcelink=$(ls -1d /usr/src/kernels/* \
139 2>/dev/null | grep -v obj | tail -1)
142 if test -n "$sourcelink" && test -e ${sourcelink}; then
143 kernelsrc=`readlink -f ${sourcelink}`
145 AC_MSG_RESULT([Not found])
147 *** Please make sure the kernel devel package for your distribution
148 *** is installed then try again. If that fails you can specify the
149 *** location of the kernel source with the '--with-linux=PATH' option.])
152 if test "$kernelsrc" = "NONE"; then
157 AC_MSG_RESULT([$kernelsrc])
158 AC_MSG_CHECKING([kernel build directory])
159 if test -z "$kernelbuild"; then
160 if test -e "/lib/modules/$(uname -r)/build"; then
161 kernelbuild=`readlink -f /lib/modules/$(uname -r)/build`
162 elif test -d ${kernelsrc}-obj/${target_cpu}/${target_cpu}; then
163 kernelbuild=${kernelsrc}-obj/${target_cpu}/${target_cpu}
164 elif test -d ${kernelsrc}-obj/${target_cpu}/default; then
165 kernelbuild=${kernelsrc}-obj/${target_cpu}/default
166 elif test -d `dirname ${kernelsrc}`/build-${target_cpu}; then
167 kernelbuild=`dirname ${kernelsrc}`/build-${target_cpu}
169 kernelbuild=${kernelsrc}
172 AC_MSG_RESULT([$kernelbuild])
174 AC_MSG_CHECKING([kernel source version])
175 utsrelease1=$kernelbuild/include/linux/version.h
176 utsrelease2=$kernelbuild/include/linux/utsrelease.h
177 utsrelease3=$kernelbuild/include/generated/utsrelease.h
178 if test -r $utsrelease1 && fgrep -q UTS_RELEASE $utsrelease1; then
179 utsrelease=linux/version.h
180 elif test -r $utsrelease2 && fgrep -q UTS_RELEASE $utsrelease2; then
181 utsrelease=linux/utsrelease.h
182 elif test -r $utsrelease3 && fgrep -q UTS_RELEASE $utsrelease3; then
183 utsrelease=generated/utsrelease.h
186 if test "$utsrelease"; then
187 kernsrcver=`(echo "#include <$utsrelease>";
188 echo "kernsrcver=UTS_RELEASE") |
189 cpp -I $kernelbuild/include |
190 grep "^kernsrcver=" | cut -d \" -f 2`
192 if test -z "$kernsrcver"; then
193 AC_MSG_RESULT([Not found])
194 AC_MSG_ERROR([*** Cannot determine kernel version.])
197 AC_MSG_RESULT([Not found])
198 if test "x$enable_linux_builtin" != xyes; then
199 AC_MSG_ERROR([*** Cannot find UTS_RELEASE definition.])
202 *** Cannot find UTS_RELEASE definition.
203 *** Please run 'make prepare' inside the kernel source tree.])
207 AC_MSG_RESULT([$kernsrcver])
210 LINUX_OBJ=${kernelbuild}
211 LINUX_VERSION=${kernsrcver}
215 AC_SUBST(LINUX_VERSION)
217 SPL_AC_MODULE_SYMVERS
221 dnl # Default SPL user configuration
223 AC_DEFUN([SPL_AC_CONFIG_USER], [])
226 dnl # Check for rpm+rpmbuild to build RPM packages. If these tools
227 dnl # are missing it is non-fatal but you will not be able to build
228 dnl # RPM packages and will be warned if you try too.
230 AC_DEFUN([SPL_AC_RPM], [
234 AC_MSG_CHECKING([whether $RPM is available])
235 AS_IF([tmp=$($RPM --version 2>/dev/null)], [
236 RPM_VERSION=$(echo $tmp | $AWK '/RPM/ { print $[3] }')
238 AC_MSG_RESULT([$HAVE_RPM ($RPM_VERSION)])
241 AC_MSG_RESULT([$HAVE_RPM])
244 AC_MSG_CHECKING([whether $RPMBUILD is available])
245 AS_IF([tmp=$($RPMBUILD --version 2>/dev/null)], [
246 RPMBUILD_VERSION=$(echo $tmp | $AWK '/RPM/ { print $[3] }')
248 AC_MSG_RESULT([$HAVE_RPMBUILD ($RPMBUILD_VERSION)])
251 AC_MSG_RESULT([$HAVE_RPMBUILD])
256 AC_SUBST(RPM_VERSION)
258 AC_SUBST(HAVE_RPMBUILD)
260 AC_SUBST(RPMBUILD_VERSION)
264 dnl # Check for dpkg+dpkg-buildpackage to build DEB packages. If these
265 dnl # tools are missing it is non-fatal but you will not be able to build
266 dnl # DEB packages and will be warned if you try too.
268 AC_DEFUN([SPL_AC_DPKG], [
270 DPKGBUILD=dpkg-buildpackage
272 AC_MSG_CHECKING([whether $DPKG is available])
273 AS_IF([tmp=$($DPKG --version 2>/dev/null)], [
274 DPKG_VERSION=$(echo $tmp | $AWK '/Debian/ { print $[7] }')
276 AC_MSG_RESULT([$HAVE_DPKG ($DPKG_VERSION)])
279 AC_MSG_RESULT([$HAVE_DPKG])
282 AC_MSG_CHECKING([whether $DPKGBUILD is available])
283 AS_IF([tmp=$($DPKGBUILD --version 2>/dev/null)], [
284 DPKGBUILD_VERSION=$(echo $tmp | \
285 $AWK '/Debian/ { print $[4] }' | cut -f-4 -d'.')
287 AC_MSG_RESULT([$HAVE_DPKGBUILD ($DPKGBUILD_VERSION)])
290 AC_MSG_RESULT([$HAVE_DPKGBUILD])
295 AC_SUBST(DPKG_VERSION)
297 AC_SUBST(HAVE_DPKGBUILD)
299 AC_SUBST(DPKGBUILD_VERSION)
303 dnl # Check for pacman+makepkg to build Arch Linux packages. If these
304 dnl # tools are missing it is non-fatal but you will not be able to
305 dnl # build Arch Linux packages and will be warned if you try too.
307 AC_DEFUN([SPL_AC_PACMAN], [
311 AC_MSG_CHECKING([whether $PACMAN is available])
312 tmp=$($PACMAN --version 2>/dev/null)
313 AS_IF([test -n "$tmp"], [
314 PACMAN_VERSION=$(echo $tmp |
315 $AWK '/Pacman/ { print $[3] }' |
318 AC_MSG_RESULT([$HAVE_PACMAN ($PACMAN_VERSION)])
321 AC_MSG_RESULT([$HAVE_PACMAN])
324 AC_MSG_CHECKING([whether $MAKEPKG is available])
325 tmp=$($MAKEPKG --version 2>/dev/null)
326 AS_IF([test -n "$tmp"], [
327 MAKEPKG_VERSION=$(echo $tmp | $AWK '/makepkg/ { print $[3] }')
329 AC_MSG_RESULT([$HAVE_MAKEPKG ($MAKEPKG_VERSION)])
332 AC_MSG_RESULT([$HAVE_MAKEPKG])
335 AC_SUBST(HAVE_PACMAN)
337 AC_SUBST(PACMAN_VERSION)
339 AC_SUBST(HAVE_MAKEPKG)
341 AC_SUBST(MAKEPKG_VERSION)
345 dnl # Until native packaging for various different packing systems
346 dnl # can be added the least we can do is attempt to use alien to
347 dnl # convert the RPM packages to the needed package type. This is
348 dnl # a hack but so far it has worked reasonable well.
350 AC_DEFUN([SPL_AC_ALIEN], [
353 AC_MSG_CHECKING([whether $ALIEN is available])
354 AS_IF([tmp=$($ALIEN --version 2>/dev/null)], [
355 ALIEN_VERSION=$(echo $tmp | $AWK '{ print $[3] }')
357 AC_MSG_RESULT([$HAVE_ALIEN ($ALIEN_VERSION)])
360 AC_MSG_RESULT([$HAVE_ALIEN])
365 AC_SUBST(ALIEN_VERSION)
369 dnl # Using the VENDOR tag from config.guess set the default
370 dnl # package type for 'make pkg': (rpm | deb | tgz)
372 AC_DEFUN([SPL_AC_DEFAULT_PACKAGE], [
373 AC_MSG_CHECKING([linux distribution])
374 if test -f /etc/toss-release ; then
376 elif test -f /etc/fedora-release ; then
378 elif test -f /etc/redhat-release ; then
380 elif test -f /etc/gentoo-release ; then
382 elif test -f /etc/arch-release ; then
384 elif test -f /etc/SuSE-release ; then
386 elif test -f /etc/slackware-version ; then
388 elif test -f /etc/lunar.release ; then
390 elif test -f /etc/lsb-release ; then
392 elif test -f /etc/debian_version ; then
397 AC_MSG_RESULT([$VENDOR])
400 AC_MSG_CHECKING([default package type])
402 toss) DEFAULT_PACKAGE=rpm ;;
403 redhat) DEFAULT_PACKAGE=rpm ;;
404 fedora) DEFAULT_PACKAGE=rpm ;;
405 gentoo) DEFAULT_PACKAGE=tgz ;;
406 arch) DEFAULT_PACKAGE=arch ;;
407 sles) DEFAULT_PACKAGE=rpm ;;
408 slackware) DEFAULT_PACKAGE=tgz ;;
409 lunar) DEFAULT_PACKAGE=tgz ;;
410 ubuntu) DEFAULT_PACKAGE=deb ;;
411 debian) DEFAULT_PACKAGE=deb ;;
412 *) DEFAULT_PACKAGE=rpm ;;
415 AC_MSG_RESULT([$DEFAULT_PACKAGE])
416 AC_SUBST(DEFAULT_PACKAGE)
420 dnl # Default SPL user configuration
422 AC_DEFUN([SPL_AC_PACKAGE], [
423 SPL_AC_DEFAULT_PACKAGE
428 AS_IF([test "$VENDOR" = "arch"], [SPL_AC_PACMAN])
431 AC_DEFUN([SPL_AC_LICENSE], [
432 AC_MSG_CHECKING([spl license])
434 AC_MSG_RESULT([$LICENSE])
435 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DHAVE_GPL_ONLY_SYMBOLS"
439 AC_DEFUN([SPL_AC_CONFIG], [
441 AC_ARG_WITH([config],
442 AS_HELP_STRING([--with-config=CONFIG],
443 [Config file 'kernel|user|all|srpm']),
444 [SPL_CONFIG="$withval"])
445 AC_ARG_ENABLE([linux-builtin],
446 [AC_HELP_STRING([--enable-linux-builtin],
447 [Configure for builtin in-tree kernel modules @<:@default=no@:>@])],
449 [enable_linux_builtin=no])
451 AC_MSG_CHECKING([spl config])
452 AC_MSG_RESULT([$SPL_CONFIG]);
455 case "$SPL_CONFIG" in
456 kernel) SPL_AC_CONFIG_KERNEL ;;
457 user) SPL_AC_CONFIG_USER ;;
458 all) SPL_AC_CONFIG_KERNEL
459 SPL_AC_CONFIG_USER ;;
462 AC_MSG_RESULT([Error!])
463 AC_MSG_ERROR([Bad value "$SPL_CONFIG" for --with-config,
464 user kernel|user|all|srpm]) ;;
467 AM_CONDITIONAL([CONFIG_USER],
468 [test "$SPL_CONFIG" = user -o "$SPL_CONFIG" = all])
469 AM_CONDITIONAL([CONFIG_KERNEL],
470 [test "$SPL_CONFIG" = kernel -o "$SPL_CONFIG" = all] &&
471 [test "x$enable_linux_builtin" != xyes ])
475 dnl # Enable if the SPL should be compiled with internal debugging enabled.
476 dnl # By default this support is disabled.
478 AC_DEFUN([SPL_AC_DEBUG], [
479 AC_MSG_CHECKING([whether debugging is enabled])
480 AC_ARG_ENABLE([debug],
481 [AS_HELP_STRING([--enable-debug],
482 [Enable generic debug support @<:@default=no@:>@])],
486 AS_IF([test "x$enable_debug" = xyes],
488 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG -Werror"
489 DEBUG_CFLAGS="-DDEBUG -Werror"
490 DEBUG_SPL="_with_debug"
492 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DNDEBUG"
493 DEBUG_CFLAGS="-DNDEBUG"
494 DEBUG_SPL="_without_debug"
497 AC_SUBST(DEBUG_CFLAGS)
499 AC_MSG_RESULT([$enable_debug])
503 dnl # Enabled by default it provides a basic debug log infrastructure.
504 dnl # Each subsystem registers itself with a name and logs messages
505 dnl # using predefined types. If the debug mask it set to allow the
506 dnl # message type it will be written to the internal log. The log
507 dnl # can be dumped to a file by echoing 1 to the 'dump' proc entry,
508 dnl # after dumping the log it must be decoded using the spl utility.
510 dnl # echo 1 >/proc/sys/kernel/spl/debug/dump
511 dnl # spl /tmp/spl-log.xxx.yyy /tmp/spl-log.xxx.yyy.txt
513 AC_DEFUN([SPL_AC_DEBUG_LOG], [
514 AC_ARG_ENABLE([debug-log],
515 [AS_HELP_STRING([--enable-debug-log],
516 [Enable basic debug logging @<:@default=yes@:>@])],
518 [enable_debug_log=yes])
520 AS_IF([test "x$enable_debug_log" = xyes],
522 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_LOG"
523 DEBUG_LOG="_with_debug_log"
524 AC_DEFINE([DEBUG_LOG], [1],
525 [Define to 1 to enable basic debug logging])
527 DEBUG_LOG="_without_debug_log"
531 AC_MSG_CHECKING([whether basic debug logging is enabled])
532 AC_MSG_RESULT([$enable_debug_log])
536 dnl # Enabled by default it provides a minimal level of memory tracking.
537 dnl # A total count of bytes allocated is kept for each alloc and free.
538 dnl # Then at module unload time a report to the console will be printed
539 dnl # if memory was leaked. Additionally, /proc/spl/kmem/slab will exist
540 dnl # and provide an easy way to inspect the kmem based slab.
542 AC_DEFUN([SPL_AC_DEBUG_KMEM], [
543 AC_ARG_ENABLE([debug-kmem],
544 [AS_HELP_STRING([--enable-debug-kmem],
545 [Enable basic kmem accounting @<:@default=yes@:>@])],
547 [enable_debug_kmem=yes])
549 AS_IF([test "x$enable_debug_kmem" = xyes],
551 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_KMEM"
552 DEBUG_KMEM="_with_debug_kmem"
553 AC_DEFINE([DEBUG_KMEM], [1],
554 [Define to 1 to enable basic kmem accounting])
556 DEBUG_KMEM="_without_debug_kmem"
560 AC_MSG_CHECKING([whether basic kmem accounting is enabled])
561 AC_MSG_RESULT([$enable_debug_kmem])
565 dnl # Disabled by default it provides detailed memory tracking. This
566 dnl # feature also requires --enable-debug-kmem to be set. When enabled
567 dnl # not only will total bytes be tracked but also the location of every
568 dnl # alloc and free. When the SPL module is unloaded a list of all leaked
569 dnl # addresses and where they were allocated will be dumped to the console.
570 dnl # Enabling this feature has a significant impact on performance but it
571 dnl # makes finding memory leaks pretty straight forward.
573 AC_DEFUN([SPL_AC_DEBUG_KMEM_TRACKING], [
574 AC_ARG_ENABLE([debug-kmem-tracking],
575 [AS_HELP_STRING([--enable-debug-kmem-tracking],
576 [Enable detailed kmem tracking @<:@default=no@:>@])],
578 [enable_debug_kmem_tracking=no])
580 AS_IF([test "x$enable_debug_kmem_tracking" = xyes],
582 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_KMEM_TRACKING"
583 DEBUG_KMEM_TRACKING="_with_debug_kmem_tracking"
584 AC_DEFINE([DEBUG_KMEM_TRACKING], [1],
585 [Define to 1 to enable detailed kmem tracking])
587 DEBUG_KMEM_TRACKING="_without_debug_kmem_tracking"
590 AC_SUBST(DEBUG_KMEM_TRACKING)
591 AC_MSG_CHECKING([whether detailed kmem tracking is enabled])
592 AC_MSG_RESULT([$enable_debug_kmem_tracking])
596 dnl # SPL_LINUX_CONFTEST
598 AC_DEFUN([SPL_LINUX_CONFTEST], [
599 cat confdefs.h - <<_ACEOF >conftest.c
605 dnl # SPL_LANG_PROGRAM(C)([PROLOGUE], [BODY])
607 m4_define([SPL_LANG_PROGRAM], [
612 dnl Do *not* indent the following line: there may be CPP directives.
613 dnl Don't move the `;' right after for the same reason.
621 dnl # SPL_LINUX_COMPILE_IFELSE / like AC_COMPILE_IFELSE
623 AC_DEFUN([SPL_LINUX_COMPILE_IFELSE], [
624 m4_ifvaln([$1], [SPL_LINUX_CONFTEST([$1])])
625 rm -Rf build && mkdir -p build && touch build/conftest.mod.c
626 echo "obj-m := conftest.o" >build/Makefile
628 test "x$enable_linux_builtin" = xyes && modpost_flag='modpost=true' # fake modpost stage
630 [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])],
632 [_AC_MSG_LOG_CONFTEST m4_ifvaln([$5],[$5])]
638 dnl # SPL_LINUX_TRY_COMPILE like AC_TRY_COMPILE
640 AC_DEFUN([SPL_LINUX_TRY_COMPILE],
641 [SPL_LINUX_COMPILE_IFELSE(
642 [AC_LANG_SOURCE([SPL_LANG_PROGRAM([[$1]], [[$2]])])],
644 [test -s build/conftest.o],
649 dnl # SPL_CHECK_SYMBOL_EXPORT
650 dnl # check symbol exported or not
652 AC_DEFUN([SPL_CHECK_SYMBOL_EXPORT], [
653 grep -q -E '[[[:space:]]]$1[[[:space:]]]' \
654 $LINUX_OBJ/Module*.symvers 2>/dev/null
656 if test $rc -ne 0; then
659 grep -q -E "EXPORT_SYMBOL.*($1)" \
660 "$LINUX_OBJ/$file" 2>/dev/null
662 if test $rc -eq 0; then
667 if test $export -eq 0; then :
678 dnl # SPL_LINUX_TRY_COMPILE_SYMBOL
679 dnl # like SPL_LINUX_TRY_COMPILE, except SPL_CHECK_SYMBOL_EXPORT
680 dnl # is called if not compiling for builtin
682 AC_DEFUN([SPL_LINUX_TRY_COMPILE_SYMBOL], [
683 SPL_LINUX_TRY_COMPILE([$1], [$2], [rc=0], [rc=1])
684 if test $rc -ne 0; then :
687 if test "x$enable_linux_builtin" != xyes; then
688 SPL_CHECK_SYMBOL_EXPORT([$3], [$4], [rc=0], [rc=1])
690 if test $rc -ne 0; then :
699 dnl # SPL_CHECK_SYMBOL_HEADER
700 dnl # check if a symbol prototype is defined in listed headers.
702 AC_DEFUN([SPL_CHECK_SYMBOL_HEADER], [
703 AC_MSG_CHECKING([whether symbol $1 exists in header])
706 grep -q "$2" "$LINUX/$file" 2>/dev/null
708 if test $rc -eq 0; then
713 if test $header -eq 0; then
723 dnl # SPL_CHECK_HEADER
724 dnl # check whether header exists and define HAVE_$2_HEADER
726 AC_DEFUN([SPL_CHECK_HEADER],
727 [AC_MSG_CHECKING([whether header $1 exists])
728 SPL_LINUX_TRY_COMPILE([
733 AC_DEFINE(HAVE_$2_HEADER, 1, [$1 exists])
743 dnl # Basic toolchain sanity check.
745 AC_DEFUN([SPL_AC_TEST_MODULE],
746 [AC_MSG_CHECKING([whether modules can be built])
747 SPL_LINUX_TRY_COMPILE([],[],[
751 if test "x$enable_linux_builtin" != xyes; then
752 AC_MSG_ERROR([*** Unable to build an empty module.])
755 *** Unable to build an empty module.
756 *** Please run 'make scripts' inside the kernel source tree.])
762 dnl # Use the atomic implemenation based on global spinlocks. This
763 dnl # should only be needed by 32-bit kernels which do not provide
764 dnl # the atomic64_* API. It may be optionally enabled as a fallback
765 dnl # if problems are observed with the direct mapping to the native
766 dnl # Linux atomic operations. You may not disable atomic spinlocks
767 dnl # if you kernel does not an atomic64_* API.
769 AC_DEFUN([SPL_AC_ATOMIC_SPINLOCK], [
770 AC_ARG_ENABLE([atomic-spinlocks],
771 [AS_HELP_STRING([--enable-atomic-spinlocks],
772 [Atomic types use spinlocks @<:@default=check@:>@])],
774 [enable_atomic_spinlocks=check])
776 SPL_LINUX_TRY_COMPILE([
777 #include <asm/atomic.h>
779 atomic64_t *ptr __attribute__ ((unused));
782 AC_DEFINE(HAVE_ATOMIC64_T, 1,
783 [kernel defines atomic64_t])
788 AS_IF([test "x$enable_atomic_spinlocks" = xcheck], [
789 AS_IF([test "x$have_atomic64_t" = xyes], [
790 enable_atomic_spinlocks=no
792 enable_atomic_spinlocks=yes
796 AS_IF([test "x$enable_atomic_spinlocks" = xyes], [
797 AC_DEFINE([ATOMIC_SPINLOCK], [1],
798 [Atomic types use spinlocks])
800 AS_IF([test "x$have_atomic64_t" = xno], [
802 [--disable-atomic-spinlocks given but required atomic64 support is unavailable])
806 AC_MSG_CHECKING([whether atomic types use spinlocks])
807 AC_MSG_RESULT([$enable_atomic_spinlocks])
809 AC_MSG_CHECKING([whether kernel defines atomic64_t])
810 AC_MSG_RESULT([$have_atomic64_t])
814 dnl # 2.6.24 API change,
815 dnl # check if atomic64_cmpxchg is defined
817 AC_DEFUN([SPL_AC_TYPE_ATOMIC64_CMPXCHG],
818 [AC_MSG_CHECKING([whether kernel defines atomic64_cmpxchg])
819 SPL_LINUX_TRY_COMPILE([
820 #include <asm/atomic.h>
821 #include <asm/system.h>
823 atomic64_cmpxchg((atomic64_t *)NULL, 0, 0);
826 AC_DEFINE(HAVE_ATOMIC64_CMPXCHG, 1,
827 [kernel defines atomic64_cmpxchg])
834 dnl # 2.6.24 API change,
835 dnl # check if atomic64_xchg is defined
837 AC_DEFUN([SPL_AC_TYPE_ATOMIC64_XCHG],
838 [AC_MSG_CHECKING([whether kernel defines atomic64_xchg])
839 SPL_LINUX_TRY_COMPILE([
840 #include <asm/atomic.h>
842 atomic64_xchg((atomic64_t *)NULL, 0);
845 AC_DEFINE(HAVE_ATOMIC64_XCHG, 1,
846 [kernel defines atomic64_xchg])
853 dnl # 2.6.24 API change,
854 dnl # check if uintptr_t typedef is defined
856 AC_DEFUN([SPL_AC_TYPE_UINTPTR_T],
857 [AC_MSG_CHECKING([whether kernel defines uintptr_t])
858 SPL_LINUX_TRY_COMPILE([
859 #include <linux/types.h>
861 uintptr_t *ptr __attribute__ ((unused));
864 AC_DEFINE(HAVE_UINTPTR_T, 1,
865 [kernel defines uintptr_t])
872 dnl # 2.6.20 API change,
873 dnl # INIT_WORK use 2 args and not store data inside
875 AC_DEFUN([SPL_AC_3ARGS_INIT_WORK],
876 [AC_MSG_CHECKING([whether INIT_WORK wants 3 args])
877 SPL_LINUX_TRY_COMPILE([
878 #include <linux/workqueue.h>
880 struct work_struct work __attribute__ ((unused));
881 INIT_WORK(&work, NULL, NULL);
884 AC_DEFINE(HAVE_3ARGS_INIT_WORK, 1,
885 [INIT_WORK wants 3 args])
892 dnl # 2.6.21 API change,
893 dnl # 'register_sysctl_table' use only one argument instead of two
895 AC_DEFUN([SPL_AC_2ARGS_REGISTER_SYSCTL],
896 [AC_MSG_CHECKING([whether register_sysctl_table() wants 2 args])
897 SPL_LINUX_TRY_COMPILE([
898 #include <linux/sysctl.h>
900 (void) register_sysctl_table(NULL, 0);
903 AC_DEFINE(HAVE_2ARGS_REGISTER_SYSCTL, 1,
904 [register_sysctl_table() wants 2 args])
911 dnl # 2.6.23 API change
912 dnl # Old set_shrinker API replaced with register_shrinker
914 AC_DEFUN([SPL_AC_SET_SHRINKER], [
915 AC_MSG_CHECKING([whether set_shrinker() available])
916 SPL_LINUX_TRY_COMPILE([
917 #include <linux/mm.h>
919 return set_shrinker(DEFAULT_SEEKS, NULL);
922 AC_DEFINE(HAVE_SET_SHRINKER, 1,
923 [set_shrinker() available])
930 dnl # 2.6.35 API change,
931 dnl # Add context to shrinker callback
933 AC_DEFUN([SPL_AC_3ARGS_SHRINKER_CALLBACK],
934 [AC_MSG_CHECKING([whether shrinker callback wants 3 args])
935 tmp_flags="$EXTRA_KCFLAGS"
936 EXTRA_KCFLAGS="-Werror"
937 SPL_LINUX_TRY_COMPILE([
938 #include <linux/mm.h>
940 int shrinker_cb(struct shrinker *, int, unsigned int);
942 struct shrinker cache_shrinker = {
943 .shrink = shrinker_cb,
944 .seeks = DEFAULT_SEEKS,
946 register_shrinker(&cache_shrinker);
949 AC_DEFINE(HAVE_3ARGS_SHRINKER_CALLBACK, 1,
950 [shrinker callback wants 3 args])
954 EXTRA_KCFLAGS="$tmp_flags"
958 dnl # 2.6.25 API change,
959 dnl # struct path entry added to struct nameidata
961 AC_DEFUN([SPL_AC_PATH_IN_NAMEIDATA],
962 [AC_MSG_CHECKING([whether struct path used in struct nameidata])
963 SPL_LINUX_TRY_COMPILE([
964 #include <linux/namei.h>
966 struct nameidata nd __attribute__ ((unused));
969 nd.path.dentry = NULL;
972 AC_DEFINE(HAVE_PATH_IN_NAMEIDATA, 1,
973 [struct path used in struct nameidata])
980 dnl # Custom SPL patch may export this system it is not required
982 AC_DEFUN([SPL_AC_TASK_CURR],
983 [AC_MSG_CHECKING([whether task_curr() is available])
984 SPL_LINUX_TRY_COMPILE_SYMBOL([
985 #include <linux/sched.h>
988 ], [task_curr], [kernel/sched.c], [
990 AC_DEFINE(HAVE_TASK_CURR, 1, [task_curr() is available])
997 dnl # 2.6.19 API change,
998 dnl # Use CTL_UNNUMBERED when binary sysctl is not required
1000 AC_DEFUN([SPL_AC_CTL_UNNUMBERED],
1001 [AC_MSG_CHECKING([whether unnumbered sysctl support exists])
1002 SPL_LINUX_TRY_COMPILE([
1003 #include <linux/sysctl.h>
1005 #ifndef CTL_UNNUMBERED
1006 #error CTL_UNNUMBERED undefined
1010 AC_DEFINE(HAVE_CTL_UNNUMBERED, 1,
1011 [unnumbered sysctl support exists])
1018 dnl # 2.6.33 API change,
1019 dnl # Removed .ctl_name from struct ctl_table.
1021 AC_DEFUN([SPL_AC_CTL_NAME], [
1022 AC_MSG_CHECKING([whether struct ctl_table has ctl_name])
1023 SPL_LINUX_TRY_COMPILE([
1024 #include <linux/sysctl.h>
1026 struct ctl_table ctl __attribute__ ((unused));
1030 AC_DEFINE(HAVE_CTL_NAME, 1, [struct ctl_table has ctl_name])
1037 dnl # 2.6.16 API change.
1038 dnl # Check if 'fls64()' is available
1040 AC_DEFUN([SPL_AC_FLS64],
1041 [AC_MSG_CHECKING([whether fls64() is available])
1042 SPL_LINUX_TRY_COMPILE([
1043 #include <linux/bitops.h>
1048 AC_DEFINE(HAVE_FLS64, 1, [fls64() is available])
1055 dnl # 2.6.18 API change, check whether device_create() is available.
1056 dnl # Device_create() was introduced in 2.6.18 and depricated
1057 dnl # class_device_create() which was fully removed in 2.6.26.
1059 AC_DEFUN([SPL_AC_DEVICE_CREATE],
1060 [AC_MSG_CHECKING([whether device_create() is available])
1061 SPL_CHECK_SYMBOL_EXPORT([device_create], [drivers/base/core.c], [
1063 AC_DEFINE(HAVE_DEVICE_CREATE, 1,
1064 [device_create() is available])
1071 dnl # 2.6.27 API change,
1072 dnl # device_create() uses 5 args, new 'drvdata' argument.
1074 AC_DEFUN([SPL_AC_5ARGS_DEVICE_CREATE], [
1075 AC_MSG_CHECKING([whether device_create() wants 5 args])
1076 tmp_flags="$EXTRA_KCFLAGS"
1077 EXTRA_KCFLAGS="-Werror"
1078 SPL_LINUX_TRY_COMPILE([
1079 #include <linux/device.h>
1081 device_create(NULL, NULL, 0, NULL, "%d", 1);
1084 AC_DEFINE(HAVE_5ARGS_DEVICE_CREATE, 1,
1085 [device_create wants 5 args])
1089 EXTRA_KCFLAGS="$tmp_flags"
1093 dnl # 2.6.13 API change, check whether class_device_create() is available.
1094 dnl # Class_device_create() was introduced in 2.6.13 and depricated
1095 dnl # class_simple_device_add() which was fully removed in 2.6.13.
1097 AC_DEFUN([SPL_AC_CLASS_DEVICE_CREATE],
1098 [AC_MSG_CHECKING([whether class_device_create() is available])
1099 SPL_LINUX_TRY_COMPILE_SYMBOL([
1100 #include <linux/device.h>
1102 class_device_create(NULL, NULL, 0, NULL, NULL);
1103 ], [class_device_create], [drivers/base/class.c], [
1105 AC_DEFINE(HAVE_CLASS_DEVICE_CREATE, 1,
1106 [class_device_create() is available])
1113 dnl # 2.6.26 API change, set_normalized_timespec() is exported.
1115 AC_DEFUN([SPL_AC_SET_NORMALIZED_TIMESPEC_EXPORT],
1116 [AC_MSG_CHECKING([whether set_normalized_timespec() is available as export])
1117 SPL_LINUX_TRY_COMPILE_SYMBOL([
1118 #include <linux/time.h>
1120 set_normalized_timespec(NULL, 0, 0);
1121 ], [set_normalized_timespec], [kernel/time.c], [
1123 AC_DEFINE(HAVE_SET_NORMALIZED_TIMESPEC_EXPORT, 1,
1124 [set_normalized_timespec() is available as export])
1131 dnl # 2.6.16 API change, set_normalize_timespec() moved to time.c
1132 dnl # previously it was available in time.h as an inline.
1134 AC_DEFUN([SPL_AC_SET_NORMALIZED_TIMESPEC_INLINE], [
1135 AC_MSG_CHECKING([whether set_normalized_timespec() is an inline])
1136 SPL_LINUX_TRY_COMPILE([
1137 #include <linux/time.h>
1138 void set_normalized_timespec(struct timespec *ts,
1139 time_t sec, long nsec) { }
1146 AC_DEFINE(HAVE_SET_NORMALIZED_TIMESPEC_INLINE, 1,
1147 [set_normalized_timespec() is available as inline])
1152 dnl # 2.6.18 API change,
1153 dnl # timespec_sub() inline function available in linux/time.h
1155 AC_DEFUN([SPL_AC_TIMESPEC_SUB], [
1156 AC_MSG_CHECKING([whether timespec_sub() is available])
1157 SPL_LINUX_TRY_COMPILE([
1158 #include <linux/time.h>
1160 struct timespec a = { 0 };
1161 struct timespec b = { 0 };
1162 struct timespec c __attribute__ ((unused));
1163 c = timespec_sub(a, b);
1166 AC_DEFINE(HAVE_TIMESPEC_SUB, 1, [timespec_sub() is available])
1173 dnl # 2.6.19 API change,
1174 dnl # check if init_utsname() is available in linux/utsname.h
1176 AC_DEFUN([SPL_AC_INIT_UTSNAME], [
1177 AC_MSG_CHECKING([whether init_utsname() is available])
1178 SPL_LINUX_TRY_COMPILE([
1179 #include <linux/utsname.h>
1181 struct new_utsname *a __attribute__ ((unused));
1185 AC_DEFINE(HAVE_INIT_UTSNAME, 1, [init_utsname() is available])
1192 dnl # 2.6.26 API change,
1193 dnl # definition of struct fdtable relocated to linux/fdtable.h
1195 AC_DEFUN([SPL_AC_FDTABLE_HEADER], [
1196 SPL_CHECK_HEADER([linux/fdtable.h], [FDTABLE], [], [])
1200 dnl # 2.6.14 API change,
1201 dnl # check whether 'files_fdtable()' exists
1203 AC_DEFUN([SPL_AC_FILES_FDTABLE], [
1204 AC_MSG_CHECKING([whether files_fdtable() is available])
1205 SPL_LINUX_TRY_COMPILE([
1206 #include <linux/sched.h>
1207 #include <linux/file.h>
1208 #ifdef HAVE_FDTABLE_HEADER
1209 #include <linux/fdtable.h>
1212 struct files_struct *files = current->files;
1213 struct fdtable *fdt __attribute__ ((unused));
1214 fdt = files_fdtable(files);
1217 AC_DEFINE(HAVE_FILES_FDTABLE, 1, [files_fdtable() is available])
1224 dnl # 3.4.0 API change,
1225 dnl # check whether '__clear_close_on_exec()' exists
1227 AC_DEFUN([SPL_AC_CLEAR_CLOSE_ON_EXEC], [
1228 AC_MSG_CHECKING([whether __clear_close_on_exec() is available])
1229 SPL_LINUX_TRY_COMPILE([
1230 #include <linux/fdtable.h>
1232 struct fdtable *fdt = NULL;
1235 __clear_close_on_exec(fd, fdt);
1238 AC_DEFINE(HAVE_CLEAR_CLOSE_ON_EXEC, 1,
1239 [__clear_close_on_exec() is available])
1246 dnl # 2.6.18 API change,
1247 dnl # added linux/uaccess.h
1249 AC_DEFUN([SPL_AC_UACCESS_HEADER], [
1250 SPL_CHECK_HEADER([linux/uaccess.h], [UACCESS], [], [])
1254 dnl # 2.6.12 API change,
1255 dnl # check whether 'kmalloc_node()' is available.
1257 AC_DEFUN([SPL_AC_KMALLOC_NODE], [
1258 AC_MSG_CHECKING([whether kmalloc_node() is available])
1259 SPL_LINUX_TRY_COMPILE([
1260 #include <linux/slab.h>
1262 void *a __attribute__ ((unused));
1263 a = kmalloc_node(1, GFP_KERNEL, 0);
1266 AC_DEFINE(HAVE_KMALLOC_NODE, 1, [kmalloc_node() is available])
1273 dnl # 2.6.9 API change,
1274 dnl # check whether 'monotonic_clock()' is available it may
1275 dnl # be available for some archs but not others.
1277 AC_DEFUN([SPL_AC_MONOTONIC_CLOCK],
1278 [AC_MSG_CHECKING([whether monotonic_clock() is available])
1279 SPL_LINUX_TRY_COMPILE_SYMBOL([
1280 #include <linux/timex.h>
1283 ], [monotonic_clock], [], [
1285 AC_DEFINE(HAVE_MONOTONIC_CLOCK, 1,
1286 [monotonic_clock() is available])
1293 dnl # 2.6.16 API change,
1294 dnl # check whether 'struct inode' has i_mutex
1296 AC_DEFUN([SPL_AC_INODE_I_MUTEX], [
1297 AC_MSG_CHECKING([whether struct inode has i_mutex])
1298 SPL_LINUX_TRY_COMPILE([
1299 #include <linux/fs.h>
1300 #include <linux/mutex.h>
1303 mutex_init(&i.i_mutex);
1306 AC_DEFINE(HAVE_INODE_I_MUTEX, 1, [struct inode has i_mutex])
1313 dnl # 2.6.29 API change,
1314 dnl # Adaptive mutexs introduced.
1316 AC_DEFUN([SPL_AC_MUTEX_OWNER], [
1317 AC_MSG_CHECKING([whether struct mutex has owner])
1318 SPL_LINUX_TRY_COMPILE([
1319 #include <linux/mutex.h>
1321 struct mutex mtx __attribute__ ((unused));
1325 AC_DEFINE(HAVE_MUTEX_OWNER, 1, [struct mutex has owner])
1332 dnl # 2.6.39 API change,
1333 dnl # Owner type change. A Linux mutex prior to 2.6.39 would store
1334 dnl # the owner as a thread_info pointer when CONFIG_DEBUG_MUTEXES
1335 dnl # was defined. As of 2.6.39 this was changed to a task_struct
1336 dnl # pointer which frankly makes a lot more sense.
1338 AC_DEFUN([SPL_AC_MUTEX_OWNER_TASK_STRUCT], [
1339 AC_MSG_CHECKING([whether struct mutex owner is a task_struct])
1340 tmp_flags="$EXTRA_KCFLAGS"
1341 EXTRA_KCFLAGS="-Werror"
1342 SPL_LINUX_TRY_COMPILE([
1343 #include <linux/mutex.h>
1345 struct mutex mtx __attribute__ ((unused));
1346 mtx.owner = current;
1349 AC_DEFINE(HAVE_MUTEX_OWNER_TASK_STRUCT, 1,
1350 [struct mutex owner is a task_struct])
1354 EXTRA_KCFLAGS="$tmp_flags"
1358 dnl # 2.6.18 API change,
1359 dnl # First introduced 'mutex_lock_nested()' in include/linux/mutex.h,
1360 dnl # as part of the mutex validator. Fallback to using 'mutex_lock()'
1361 dnl # if the mutex validator is disabled or otherwise unavailable.
1363 AC_DEFUN([SPL_AC_MUTEX_LOCK_NESTED], [
1364 AC_MSG_CHECKING([whether mutex_lock_nested() is available])
1365 SPL_LINUX_TRY_COMPILE([
1366 #include <linux/mutex.h>
1370 mutex_lock_nested(&mutex, 0);
1373 AC_DEFINE(HAVE_MUTEX_LOCK_NESTED, 1,
1374 [mutex_lock_nested() is available])
1381 dnl # 2.6.27 API change,
1382 dnl # on_each_cpu() uses 3 args, no 'retry' argument
1384 AC_DEFUN([SPL_AC_3ARGS_ON_EACH_CPU], [
1385 AC_MSG_CHECKING([whether on_each_cpu() wants 3 args])
1386 SPL_LINUX_TRY_COMPILE([
1387 #include <linux/smp.h>
1389 on_each_cpu(NULL, NULL, 0);
1392 AC_DEFINE(HAVE_3ARGS_ON_EACH_CPU, 1,
1393 [on_each_cpu wants 3 args])
1400 dnl # 2.6.18 API change,
1401 dnl # kallsyms_lookup_name no longer exported
1403 AC_DEFUN([SPL_AC_KALLSYMS_LOOKUP_NAME],
1404 [AC_MSG_CHECKING([whether kallsyms_lookup_name() is available])
1405 SPL_LINUX_TRY_COMPILE_SYMBOL([
1406 #include <linux/kallsyms.h>
1408 kallsyms_lookup_name(NULL);
1409 ], [kallsyms_lookup_name], [], [
1411 AC_DEFINE(HAVE_KALLSYMS_LOOKUP_NAME, 1,
1412 [kallsyms_lookup_name() is available])
1419 dnl # Proposed API change,
1420 dnl # This symbol is not available in stock kernels. You may build a
1421 dnl # custom kernel with the *-spl-export-symbols.patch which will export
1422 dnl # these symbols for use. If your already rolling a custom kernel for
1423 dnl # your environment this is recommended.
1425 AC_DEFUN([SPL_AC_GET_VMALLOC_INFO],
1426 [AC_MSG_CHECKING([whether get_vmalloc_info() is available])
1427 SPL_CHECK_SYMBOL_EXPORT([get_vmalloc_info], [], [
1429 AC_DEFINE(HAVE_GET_VMALLOC_INFO, 1,
1430 [get_vmalloc_info() is available])
1437 dnl # 2.6.17 API change
1438 dnl # The helper functions first_online_pgdat(), next_online_pgdat(), and
1439 dnl # next_zone() are introduced to simplify for_each_zone(). These symbols
1440 dnl # were exported in 2.6.17 for use by modules which was consistent with
1441 dnl # the previous implementation of for_each_zone(). From 2.6.18 - 2.6.19
1442 dnl # the symbols were exported as 'unused', and by 2.6.20 they exports
1443 dnl # were dropped entirely leaving modules no way to directly iterate over
1444 dnl # the zone list. Because we need access to the zone helpers we check
1445 dnl # if the kernel contains the old or new implementation. Then we check
1446 dnl # to see if the symbols we need for each version are available. If they
1447 dnl # are not, dynamically aquire the addresses with kallsyms_lookup_name().
1449 AC_DEFUN([SPL_AC_PGDAT_HELPERS], [
1450 AC_MSG_CHECKING([whether symbol *_pgdat exist])
1451 grep -q -E 'first_online_pgdat' $LINUX/include/linux/mmzone.h 2>/dev/null
1453 if test $rc -eq 0; then
1454 AC_MSG_RESULT([yes])
1455 AC_DEFINE(HAVE_PGDAT_HELPERS, 1, [pgdat helpers are available])
1462 dnl # Proposed API change,
1463 dnl # This symbol is not available in stock kernels. You may build a
1464 dnl # custom kernel with the *-spl-export-symbols.patch which will export
1465 dnl # these symbols for use. If your already rolling a custom kernel for
1466 dnl # your environment this is recommended.
1468 AC_DEFUN([SPL_AC_FIRST_ONLINE_PGDAT],
1469 [AC_MSG_CHECKING([whether first_online_pgdat() is available])
1470 SPL_LINUX_TRY_COMPILE_SYMBOL([
1471 #include <linux/mmzone.h>
1473 first_online_pgdat();
1474 ], [first_online_pgdat], [], [
1476 AC_DEFINE(HAVE_FIRST_ONLINE_PGDAT, 1,
1477 [first_online_pgdat() is available])
1484 dnl # Proposed API change,
1485 dnl # This symbol is not available in stock kernels. You may build a
1486 dnl # custom kernel with the *-spl-export-symbols.patch which will export
1487 dnl # these symbols for use. If your already rolling a custom kernel for
1488 dnl # your environment this is recommended.
1490 AC_DEFUN([SPL_AC_NEXT_ONLINE_PGDAT],
1491 [AC_MSG_CHECKING([whether next_online_pgdat() is available])
1492 SPL_LINUX_TRY_COMPILE_SYMBOL([
1493 #include <linux/mmzone.h>
1495 next_online_pgdat(NULL);
1496 ], [next_online_pgdat], [], [
1498 AC_DEFINE(HAVE_NEXT_ONLINE_PGDAT, 1,
1499 [next_online_pgdat() is available])
1506 dnl # Proposed API change,
1507 dnl # This symbol is not available in stock kernels. You may build a
1508 dnl # custom kernel with the *-spl-export-symbols.patch which will export
1509 dnl # these symbols for use. If your already rolling a custom kernel for
1510 dnl # your environment this is recommended.
1512 AC_DEFUN([SPL_AC_NEXT_ZONE],
1513 [AC_MSG_CHECKING([whether next_zone() is available])
1514 SPL_LINUX_TRY_COMPILE_SYMBOL([
1515 #include <linux/mmzone.h>
1518 ], [next_zone], [], [
1520 AC_DEFINE(HAVE_NEXT_ZONE, 1, [next_zone() is available])
1527 dnl # 2.6.17 API change,
1528 dnl # See SPL_AC_PGDAT_HELPERS for details.
1530 AC_DEFUN([SPL_AC_PGDAT_LIST],
1531 [AC_MSG_CHECKING([whether pgdat_list is available])
1532 SPL_LINUX_TRY_COMPILE_SYMBOL([
1533 #include <linux/topology.h>
1534 pg_data_t *tmp = pgdat_list;
1535 ], [], [pgdat_list], [], [
1537 AC_DEFINE(HAVE_PGDAT_LIST, 1, [pgdat_list is available])
1544 dnl # 2.6.18 API change,
1545 dnl # First introduced global_page_state() support as an inline.
1547 AC_DEFUN([SPL_AC_GLOBAL_PAGE_STATE], [
1548 AC_MSG_CHECKING([whether global_page_state() is available])
1549 SPL_LINUX_TRY_COMPILE([
1550 #include <linux/mm.h>
1552 unsigned long state __attribute__ ((unused));
1553 state = global_page_state(0);
1556 AC_DEFINE(HAVE_GLOBAL_PAGE_STATE, 1,
1557 [global_page_state() is available])
1564 dnl # 2.6.21 API change (plus subsequent naming convention changes),
1565 dnl # Public global zone stats now include a free page count. However
1566 dnl # the enumerated names of the counters have changed since this API
1567 dnl # was introduced. We need to deduce the corrent name to use. This
1568 dnl # replaces the priviate get_zone_counts() interface.
1570 dnl # NR_FREE_PAGES was available from 2.6.21 to current kernels, which
1571 dnl # is 2.6.30 as of when this was written.
1573 AC_DEFUN([SPL_AC_ZONE_STAT_ITEM_FREE], [
1574 AC_MSG_CHECKING([whether page state NR_FREE_PAGES is available])
1575 SPL_LINUX_TRY_COMPILE([
1576 #include <linux/mm.h>
1578 enum zone_stat_item zsi __attribute__ ((unused));
1579 zsi = NR_FREE_PAGES;
1582 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_FREE_PAGES, 1,
1583 [Page state NR_FREE_PAGES is available])
1590 dnl # 2.6.21 API change (plus subsequent naming convention changes),
1591 dnl # Public global zone stats now include an inactive page count. However
1592 dnl # the enumerated names of the counters have changed since this API
1593 dnl # was introduced. We need to deduce the corrent name to use. This
1594 dnl # replaces the priviate get_zone_counts() interface.
1596 dnl # NR_INACTIVE was available from 2.6.21 to 2.6.27 and included both
1597 dnl # anonymous and file inactive pages. As of 2.6.28 it was split in
1598 dnl # to NR_INACTIVE_ANON and NR_INACTIVE_FILE.
1600 AC_DEFUN([SPL_AC_ZONE_STAT_ITEM_INACTIVE], [
1601 AC_MSG_CHECKING([whether page state NR_INACTIVE is available])
1602 SPL_LINUX_TRY_COMPILE([
1603 #include <linux/mm.h>
1605 enum zone_stat_item zsi __attribute__ ((unused));
1609 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_INACTIVE, 1,
1610 [Page state NR_INACTIVE is available])
1615 AC_MSG_CHECKING([whether page state NR_INACTIVE_ANON is available])
1616 SPL_LINUX_TRY_COMPILE([
1617 #include <linux/mm.h>
1619 enum zone_stat_item zsi __attribute__ ((unused));
1620 zsi = NR_INACTIVE_ANON;
1623 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_ANON, 1,
1624 [Page state NR_INACTIVE_ANON is available])
1629 AC_MSG_CHECKING([whether page state NR_INACTIVE_FILE is available])
1630 SPL_LINUX_TRY_COMPILE([
1631 #include <linux/mm.h>
1633 enum zone_stat_item zsi __attribute__ ((unused));
1634 zsi = NR_INACTIVE_FILE;
1637 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_FILE, 1,
1638 [Page state NR_INACTIVE_FILE is available])
1645 dnl # 2.6.21 API change (plus subsequent naming convention changes),
1646 dnl # Public global zone stats now include an active page count. However
1647 dnl # the enumerated names of the counters have changed since this API
1648 dnl # was introduced. We need to deduce the corrent name to use. This
1649 dnl # replaces the priviate get_zone_counts() interface.
1651 dnl # NR_ACTIVE was available from 2.6.21 to 2.6.27 and included both
1652 dnl # anonymous and file active pages. As of 2.6.28 it was split in
1653 dnl # to NR_ACTIVE_ANON and NR_ACTIVE_FILE.
1655 AC_DEFUN([SPL_AC_ZONE_STAT_ITEM_ACTIVE], [
1656 AC_MSG_CHECKING([whether page state NR_ACTIVE is available])
1657 SPL_LINUX_TRY_COMPILE([
1658 #include <linux/mm.h>
1660 enum zone_stat_item zsi __attribute__ ((unused));
1664 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_ACTIVE, 1,
1665 [Page state NR_ACTIVE is available])
1670 AC_MSG_CHECKING([whether page state NR_ACTIVE_ANON is available])
1671 SPL_LINUX_TRY_COMPILE([
1672 #include <linux/mm.h>
1674 enum zone_stat_item zsi __attribute__ ((unused));
1675 zsi = NR_ACTIVE_ANON;
1678 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_ANON, 1,
1679 [Page state NR_ACTIVE_ANON is available])
1684 AC_MSG_CHECKING([whether page state NR_ACTIVE_FILE is available])
1685 SPL_LINUX_TRY_COMPILE([
1686 #include <linux/mm.h>
1688 enum zone_stat_item zsi __attribute__ ((unused));
1689 zsi = NR_ACTIVE_FILE;
1692 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_FILE, 1,
1693 [Page state NR_ACTIVE_FILE is available])
1700 dnl # Proposed API change for legacy kernels.
1701 dnl # This symbol is not available in older kernels. For kernels post
1702 dnl # 2.6.21 the global_page_state() API is used to get free/inactive/active
1703 dnl # page state information. This symbol is only used in legacy kernels
1704 dnl # any only as a last resort.
1706 AC_DEFUN([SPL_AC_GET_ZONE_COUNTS], [
1707 AC_MSG_CHECKING([whether symbol get_zone_counts is needed])
1708 SPL_LINUX_TRY_COMPILE([
1710 #if !defined(HAVE_ZONE_STAT_ITEM_NR_FREE_PAGES)
1711 #error "global_page_state needs NR_FREE_PAGES"
1714 #if !defined(HAVE_ZONE_STAT_ITEM_NR_ACTIVE) && \
1715 !defined(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_ANON) && \
1716 !defined(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_FILE)
1717 #error "global_page_state needs NR_ACTIVE*"
1720 #if !defined(HAVE_ZONE_STAT_ITEM_NR_INACTIVE) && \
1721 !defined(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_ANON) && \
1722 !defined(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_FILE)
1723 #error "global_page_state needs NR_INACTIVE*"
1729 AC_DEFINE(NEED_GET_ZONE_COUNTS, 1,
1730 [get_zone_counts() is needed])
1732 AC_MSG_CHECKING([whether get_zone_counts() is available])
1733 SPL_LINUX_TRY_COMPILE_SYMBOL([
1734 #include <linux/mmzone.h>
1736 get_zone_counts(NULL, NULL, NULL);
1737 ], [get_zone_counts], [], [
1739 AC_DEFINE(HAVE_GET_ZONE_COUNTS, 1,
1740 [get_zone_counts() is available])
1748 dnl # 2.6.27 API change,
1749 dnl # The user_path_dir() replaces __user_walk()
1751 AC_DEFUN([SPL_AC_USER_PATH_DIR],
1752 [AC_MSG_CHECKING([whether user_path_dir() is available])
1753 SPL_LINUX_TRY_COMPILE_SYMBOL([
1754 #include <linux/fcntl.h>
1755 #include <linux/namei.h>
1757 user_path_dir(NULL, NULL);
1758 ], [user_path_at], [], [
1760 AC_DEFINE(HAVE_USER_PATH_DIR, 1, [user_path_dir() is available])
1767 dnl # Symbol available in RHEL kernels not in stock kernels.
1769 AC_DEFUN([SPL_AC_SET_FS_PWD],
1770 [AC_MSG_CHECKING([whether set_fs_pwd() is available])
1771 SPL_LINUX_TRY_COMPILE_SYMBOL([
1772 #include <linux/spinlock.h>
1773 #include <linux/fs_struct.h>
1776 ], [set_fs_pwd], [], [
1778 AC_DEFINE(HAVE_SET_FS_PWD, 1, [set_fs_pwd() is available])
1785 dnl # 2.6.25 API change,
1786 dnl # Simplied API by replacing mnt+dentry args with a single path arg.
1788 AC_DEFUN([SPL_AC_2ARGS_SET_FS_PWD],
1789 [AC_MSG_CHECKING([whether set_fs_pwd() wants 2 args])
1790 SPL_LINUX_TRY_COMPILE([
1791 #include <linux/sched.h>
1792 #include <linux/fs_struct.h>
1794 set_fs_pwd(NULL, NULL);
1797 AC_DEFINE(HAVE_2ARGS_SET_FS_PWD, 1,
1798 [set_fs_pwd() wants 2 args])
1805 dnl # SLES API change, never adopted in mainline,
1806 dnl # Third 'struct vfsmount *' argument removed.
1808 AC_DEFUN([SPL_AC_2ARGS_VFS_UNLINK],
1809 [AC_MSG_CHECKING([whether vfs_unlink() wants 2 args])
1810 SPL_LINUX_TRY_COMPILE([
1811 #include <linux/fs.h>
1813 vfs_unlink(NULL, NULL);
1816 AC_DEFINE(HAVE_2ARGS_VFS_UNLINK, 1,
1817 [vfs_unlink() wants 2 args])
1824 dnl # SLES API change, never adopted in mainline,
1825 dnl # Third and sixth 'struct vfsmount *' argument removed.
1827 AC_DEFUN([SPL_AC_4ARGS_VFS_RENAME],
1828 [AC_MSG_CHECKING([whether vfs_rename() wants 4 args])
1829 SPL_LINUX_TRY_COMPILE([
1830 #include <linux/fs.h>
1832 vfs_rename(NULL, NULL, NULL, NULL);
1835 AC_DEFINE(HAVE_4ARGS_VFS_RENAME, 1,
1836 [vfs_rename() wants 4 args])
1843 dnl # 2.6.36 API change,
1844 dnl # The 'struct fs_struct->lock' was changed from a rwlock_t to
1845 dnl # a spinlock_t to improve the fastpath performance.
1847 AC_DEFUN([SPL_AC_FS_STRUCT_SPINLOCK], [
1848 AC_MSG_CHECKING([whether struct fs_struct uses spinlock_t])
1849 tmp_flags="$EXTRA_KCFLAGS"
1850 EXTRA_KCFLAGS="-Werror"
1851 SPL_LINUX_TRY_COMPILE([
1852 #include <linux/sched.h>
1853 #include <linux/fs_struct.h>
1855 struct fs_struct fs;
1856 spin_lock_init(&fs.lock);
1859 AC_DEFINE(HAVE_FS_STRUCT_SPINLOCK, 1,
1860 [struct fs_struct uses spinlock_t])
1864 EXTRA_KCFLAGS="$tmp_flags"
1868 dnl # 2.6.29 API change,
1869 dnl # check whether 'struct cred' exists
1871 AC_DEFUN([SPL_AC_CRED_STRUCT], [
1872 AC_MSG_CHECKING([whether struct cred exists])
1873 SPL_LINUX_TRY_COMPILE([
1874 #include <linux/cred.h>
1876 struct cred *cr __attribute__ ((unused));
1880 AC_DEFINE(HAVE_CRED_STRUCT, 1, [struct cred exists])
1887 dnl # Custom SPL patch may export this symbol.
1889 AC_DEFUN([SPL_AC_GROUPS_SEARCH],
1890 [AC_MSG_CHECKING([whether groups_search() is available])
1891 SPL_LINUX_TRY_COMPILE_SYMBOL([
1892 #include <linux/cred.h>
1894 groups_search(NULL, 0);
1895 ], [groups_search], [], [
1897 AC_DEFINE(HAVE_GROUPS_SEARCH, 1, [groups_search() is available])
1904 dnl # 2.6.x API change,
1905 dnl # __put_task_struct() was exported in RHEL5 but unavailable elsewhere.
1907 AC_DEFUN([SPL_AC_PUT_TASK_STRUCT],
1908 [AC_MSG_CHECKING([whether __put_task_struct() is available])
1909 SPL_LINUX_TRY_COMPILE_SYMBOL([
1910 #include <linux/sched.h>
1912 __put_task_struct(NULL);
1913 ], [__put_task_struct], [], [
1915 AC_DEFINE(HAVE_PUT_TASK_STRUCT, 1,
1916 [__put_task_struct() is available])
1923 dnl # 2.6.32 API change,
1924 dnl # Unused 'struct file *' removed from prototype.
1926 AC_DEFUN([SPL_AC_5ARGS_PROC_HANDLER], [
1927 AC_MSG_CHECKING([whether proc_handler() wants 5 args])
1928 SPL_LINUX_TRY_COMPILE([
1929 #include <linux/sysctl.h>
1931 proc_dostring(NULL, 0, NULL, NULL, NULL);
1934 AC_DEFINE(HAVE_5ARGS_PROC_HANDLER, 1,
1935 [proc_handler() wants 5 args])
1942 dnl # 2.6.x API change,
1943 dnl # kvasprintf() function added.
1945 AC_DEFUN([SPL_AC_KVASPRINTF],
1946 [AC_MSG_CHECKING([whether kvasprintf() is available])
1947 SPL_LINUX_TRY_COMPILE_SYMBOL([
1948 #include <linux/kernel.h>
1950 kvasprintf(0, NULL, *((va_list*)NULL));
1951 ], [kvasprintf], [], [
1953 AC_DEFINE(HAVE_KVASPRINTF, 1, [kvasprintf() is available])
1960 dnl # 2.6.29 API change,
1961 dnl # vfs_fsync() funcation added, prior to this use file_fsync().
1963 AC_DEFUN([SPL_AC_VFS_FSYNC],
1964 [AC_MSG_CHECKING([whether vfs_fsync() is available])
1965 SPL_LINUX_TRY_COMPILE_SYMBOL([
1966 #include <linux/fs.h>
1969 ], [vfs_fsync], [fs/sync.c], [
1971 AC_DEFINE(HAVE_VFS_FSYNC, 1, [vfs_fsync() is available])
1978 dnl # 2.6.35 API change,
1979 dnl # Unused 'struct dentry *' removed from vfs_fsync() prototype.
1981 AC_DEFUN([SPL_AC_2ARGS_VFS_FSYNC], [
1982 AC_MSG_CHECKING([whether vfs_fsync() wants 2 args])
1983 SPL_LINUX_TRY_COMPILE([
1984 #include <linux/fs.h>
1989 AC_DEFINE(HAVE_2ARGS_VFS_FSYNC, 1, [vfs_fsync() wants 2 args])
1996 dnl # 2.6.33 API change. Also backported in RHEL5 as of 2.6.18-190.el5.
1997 dnl # Earlier versions of rwsem_is_locked() were inline and had a race
1998 dnl # condition. The fixed version is exported as a symbol. The race
1999 dnl # condition is fixed by acquiring sem->wait_lock, so we must not
2000 dnl # call that version while holding sem->wait_lock.
2002 AC_DEFUN([SPL_AC_EXPORTED_RWSEM_IS_LOCKED],
2003 [AC_MSG_CHECKING([whether rwsem_is_locked() acquires sem->wait_lock])
2004 SPL_LINUX_TRY_COMPILE_SYMBOL([
2005 #include <linux/rwsem.h>
2006 int rwsem_is_locked(struct rw_semaphore *sem) { return 0; }
2007 ], [], [rwsem_is_locked], [lib/rwsem-spinlock.c], [
2009 AC_DEFINE(RWSEM_IS_LOCKED_TAKES_WAIT_LOCK, 1,
2010 [rwsem_is_locked() acquires sem->wait_lock])
2017 dnl # 2.6.37 API compat,
2018 dnl # The function invalidate_inodes() is no longer exported by the kernel.
2019 dnl # The prototype however is still available which means it is safe
2020 dnl # to acquire the symbol's address using spl_kallsyms_lookup_name().
2022 dnl # The Proxmox VE kernel contains a patch which renames the function
2023 dnl # invalidate_inodes() to invalidate_inodes_check(). In the process
2024 dnl # it adds a 'check' argument and a '#define invalidate_inodes(x)'
2025 dnl # compatibility wrapper for legacy callers. Therefore, if either
2026 dnl # of these functions are exported invalidate_inodes() can be
2029 AC_DEFUN([SPL_AC_KERNEL_INVALIDATE_INODES], [
2030 AC_MSG_CHECKING([whether invalidate_inodes() is available])
2031 SPL_LINUX_TRY_COMPILE_SYMBOL([
2032 #include <linux/fs.h>
2035 ], [invalidate_inodes], [], [
2037 AC_DEFINE(HAVE_INVALIDATE_INODES, 1,
2038 [invalidate_inodes() is available])
2043 AC_MSG_CHECKING([whether invalidate_inodes_check() is available])
2044 SPL_LINUX_TRY_COMPILE_SYMBOL([
2045 #include <linux/fs.h>
2046 #ifndef invalidate_inodes
2047 #error invalidate_inodes is not a macro
2049 ], [ ], [invalidate_inodes_check], [], [
2051 AC_DEFINE(HAVE_INVALIDATE_INODES_CHECK, 1,
2052 [invalidate_inodes_check() is available])
2059 dnl # 2.6.39 API compat,
2060 dnl # The function invalidate_inodes() now take 2 arguments. The second
2061 dnl # 'kill_dirty' argument describes how invalidate_inodes() should
2062 dnl # handle dirty inodes. Only when set will dirty inodes be discarded,
2063 dnl # otherwise they will be handled as busy.
2065 dnl # Unfortunately, we don't have access to the invalidate_inodes()
2066 dnl # prototype so it's not easy to check how many arguments it takes.
2067 dnl # However, this change was done for the benefit of invalidate_device()
2068 dnl # which also added an argument. The invalidate_device() symbol does
2069 dnl # exist in the development headers so if it takes two arguments we
2070 dnl # can fairly safely infer that invalidate_inodes() takes two arguments
2071 dnl # as well. See commit 93b270f76e7ef3b81001576860c2701931cdc78b.
2073 AC_DEFUN([SPL_AC_KERNEL_2ARGS_INVALIDATE_INODES],
2074 [AC_MSG_CHECKING([whether invalidate_inodes() wants 2 args])
2075 SPL_LINUX_TRY_COMPILE([
2076 #include <linux/fs.h>
2078 return __invalidate_device(NULL, 0);
2081 AC_DEFINE(HAVE_2ARGS_INVALIDATE_INODES, 1,
2082 [invalidate_inodes() wants 2 args])
2089 dnl # 2.6.xx API compat,
2090 dnl # There currently exists no exposed API to partially shrink the dcache.
2091 dnl # The expected mechanism to shrink the cache is a registered shrinker
2092 dnl # which is called during memory pressure.
2094 AC_DEFUN([SPL_AC_SHRINK_DCACHE_MEMORY],
2095 [AC_MSG_CHECKING([whether shrink_dcache_memory() is available])
2096 SPL_LINUX_TRY_COMPILE_SYMBOL([
2097 #include <linux/dcache.h>
2099 shrink_dcache_memory(0, 0);
2100 ], [shrink_dcache_memory], [fs/dcache.c], [
2102 AC_DEFINE(HAVE_SHRINK_DCACHE_MEMORY, 1,
2103 [shrink_dcache_memory() is available])
2110 dnl # 2.6.xx API compat,
2111 dnl # There currently exists no exposed API to partially shrink the icache.
2112 dnl # The expected mechanism to shrink the cache is a registered shrinker
2113 dnl # which is called during memory pressure.
2115 AC_DEFUN([SPL_AC_SHRINK_ICACHE_MEMORY],
2116 [AC_MSG_CHECKING([whether shrink_icache_memory() is available])
2117 SPL_LINUX_TRY_COMPILE_SYMBOL([
2118 #include <linux/dcache.h>
2120 shrink_icache_memory(0, 0);
2121 ], [shrink_icache_memory], [fs/inode.c], [
2123 AC_DEFINE(HAVE_SHRINK_ICACHE_MEMORY, 1,
2124 [shrink_icache_memory() is available])
2131 dnl # 2.6.39 API compat,
2132 dnl # The path_lookup() function has been renamed to kern_path_parent()
2133 dnl # and the flags argument has been removed. The only behavior now
2134 dnl # offered is that of LOOKUP_PARENT. The spl already always passed
2135 dnl # this flag so dropping the flag does not impact us.
2137 AC_DEFUN([SPL_AC_KERN_PATH_PARENT_HEADER], [
2138 SPL_CHECK_SYMBOL_HEADER(
2140 [int kern_path_parent(const char \*, struct nameidata \*)],
2141 [include/linux/namei.h],
2142 [AC_DEFINE(HAVE_KERN_PATH_PARENT_HEADER, 1,
2143 [kern_path_parent() is available])],
2148 dnl # 3.1 API compat,
2149 dnl # The kern_path_parent() symbol is no longer exported by the kernel.
2150 dnl # However, it remains the prefered interface and since we still have
2151 dnl # access to the prototype we dynamically lookup the required address.
2153 AC_DEFUN([SPL_AC_KERN_PATH_PARENT_SYMBOL],
2154 [AC_MSG_CHECKING([whether kern_path_parent() is available])
2155 SPL_LINUX_TRY_COMPILE_SYMBOL([
2156 #include <linux/namei.h>
2158 kern_path_parent(NULL, NULL);
2159 ], [kern_path_parent], [fs/namei.c], [
2161 AC_DEFINE(HAVE_KERN_PATH_PARENT_SYMBOL, 1,
2162 [kern_path_parent() is available])
2169 dnl # 2.6.39 API compat,
2170 dnl # The function zlib_deflate_workspacesize() now take 2 arguments.
2171 dnl # This was done to avoid always having to allocate the maximum size
2172 dnl # workspace (268K). The caller can now specific the windowBits and
2173 dnl # memLevel compression parameters to get a smaller workspace.
2175 AC_DEFUN([SPL_AC_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE],
2176 [AC_MSG_CHECKING([whether zlib_deflate_workspacesize() wants 2 args])
2177 SPL_LINUX_TRY_COMPILE([
2178 #include <linux/zlib.h>
2180 return zlib_deflate_workspacesize(MAX_WBITS, MAX_MEM_LEVEL);
2183 AC_DEFINE(HAVE_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE, 1,
2184 [zlib_deflate_workspacesize() wants 2 args])
2191 dnl # 2.6.39 API change,
2192 dnl # Shrinker adjust to use common shrink_control structure.
2194 AC_DEFUN([SPL_AC_SHRINK_CONTROL_STRUCT], [
2195 AC_MSG_CHECKING([whether struct shrink_control exists])
2196 SPL_LINUX_TRY_COMPILE([
2197 #include <linux/mm.h>
2199 struct shrink_control sc __attribute__ ((unused));
2202 sc.gfp_mask = GFP_KERNEL;
2205 AC_DEFINE(HAVE_SHRINK_CONTROL_STRUCT, 1,
2206 [struct shrink_control exists])
2213 dnl # 3.1 API Change
2215 dnl # The rw_semaphore.wait_lock member was changed from spinlock_t to
2216 dnl # raw_spinlock_t at commit ddb6c9b58a19edcfac93ac670b066c836ff729f1.
2218 AC_DEFUN([SPL_AC_RWSEM_SPINLOCK_IS_RAW], [
2219 AC_MSG_CHECKING([whether struct rw_semaphore member wait_lock is raw])
2220 tmp_flags="$EXTRA_KCFLAGS"
2221 EXTRA_KCFLAGS="-Werror"
2222 SPL_LINUX_TRY_COMPILE([
2223 #include <linux/rwsem.h>
2225 struct rw_semaphore dummy_semaphore __attribute__ ((unused));
2226 raw_spinlock_t dummy_lock __attribute__ ((unused));
2227 dummy_semaphore.wait_lock = dummy_lock;
2230 AC_DEFINE(RWSEM_SPINLOCK_IS_RAW, 1,
2231 [struct rw_semaphore member wait_lock is raw_spinlock_t])
2235 EXTRA_KCFLAGS="$tmp_flags"