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="$KERNELCPPFLAGS -Wstrict-prototypes"
18 AC_SUBST(KERNELCPPFLAGS)
23 SPL_AC_DEBUG_KMEM_TRACKING
25 SPL_AC_ATOMIC_SPINLOCK
26 SPL_AC_TYPE_ATOMIC64_CMPXCHG
27 SPL_AC_TYPE_ATOMIC64_XCHG
29 SPL_AC_2ARGS_REGISTER_SYSCTL
31 SPL_AC_3ARGS_SHRINKER_CALLBACK
32 SPL_AC_PATH_IN_NAMEIDATA
38 SPL_AC_5ARGS_DEVICE_CREATE
39 SPL_AC_CLASS_DEVICE_CREATE
40 SPL_AC_SET_NORMALIZED_TIMESPEC_EXPORT
41 SPL_AC_SET_NORMALIZED_TIMESPEC_INLINE
46 SPL_AC_MONOTONIC_CLOCK
49 SPL_AC_MUTEX_OWNER_TASK_STRUCT
50 SPL_AC_MUTEX_LOCK_NESTED
51 SPL_AC_3ARGS_ON_EACH_CPU
52 SPL_AC_KALLSYMS_LOOKUP_NAME
53 SPL_AC_GET_VMALLOC_INFO
55 SPL_AC_FIRST_ONLINE_PGDAT
56 SPL_AC_NEXT_ONLINE_PGDAT
59 SPL_AC_GLOBAL_PAGE_STATE
60 SPL_AC_ZONE_STAT_ITEM_FREE
61 SPL_AC_ZONE_STAT_ITEM_INACTIVE
62 SPL_AC_ZONE_STAT_ITEM_ACTIVE
63 SPL_AC_GET_ZONE_COUNTS
66 SPL_AC_2ARGS_SET_FS_PWD
67 SPL_AC_2ARGS_VFS_UNLINK
68 SPL_AC_4ARGS_VFS_RENAME
70 SPL_AC_2ARGS_VFS_FSYNC
71 SPL_AC_INODE_TRUNCATE_RANGE
72 SPL_AC_FS_STRUCT_SPINLOCK
75 SPL_AC_PUT_TASK_STRUCT
76 SPL_AC_5ARGS_PROC_HANDLER
78 SPL_AC_EXPORTED_RWSEM_IS_LOCKED
79 SPL_AC_KERNEL_FALLOCATE
80 SPL_AC_SHRINK_DCACHE_MEMORY
81 SPL_AC_SHRINK_ICACHE_MEMORY
82 SPL_AC_KERN_PATH_PARENT_HEADER
83 SPL_AC_KERN_PATH_PARENT_SYMBOL
84 SPL_AC_KERN_PATH_LOCKED
85 SPL_AC_CONFIG_KALLSYMS
86 SPL_AC_CONFIG_ZLIB_INFLATE
87 SPL_AC_CONFIG_ZLIB_DEFLATE
88 SPL_AC_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE
89 SPL_AC_SHRINK_CONTROL_STRUCT
90 SPL_AC_RWSEM_SPINLOCK_IS_RAW
93 AC_DEFUN([SPL_AC_MODULE_SYMVERS], [
94 modpost=$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 ${sourcelink}`
145 kernelsrc="[Not found]"
148 if test "$kernelsrc" = "NONE"; then
153 AC_MSG_RESULT([$kernelsrc])
154 if test ! -d "$kernelsrc"; then
156 *** Please make sure the kernel devel package for your distribution
157 *** is installed then try again. If that fails you can specify the
158 *** location of the kernel source with the '--with-linux=PATH' option.])
161 AC_MSG_CHECKING([kernel build directory])
162 if test -z "$kernelbuild"; then
163 if test -e "/lib/modules/$(uname -r)/build"; then
164 kernelbuild=`readlink -f /lib/modules/$(uname -r)/build`
165 elif test -d ${kernelsrc}-obj/${target_cpu}/${target_cpu}; then
166 kernelbuild=${kernelsrc}-obj/${target_cpu}/${target_cpu}
167 elif test -d ${kernelsrc}-obj/${target_cpu}/default; then
168 kernelbuild=${kernelsrc}-obj/${target_cpu}/default
169 elif test -d `dirname ${kernelsrc}`/build-${target_cpu}; then
170 kernelbuild=`dirname ${kernelsrc}`/build-${target_cpu}
172 kernelbuild=${kernelsrc}
175 AC_MSG_RESULT([$kernelbuild])
177 AC_MSG_CHECKING([kernel source version])
178 utsrelease1=$kernelbuild/include/linux/version.h
179 utsrelease2=$kernelbuild/include/linux/utsrelease.h
180 utsrelease3=$kernelbuild/include/generated/utsrelease.h
181 if test -r $utsrelease1 && fgrep -q UTS_RELEASE $utsrelease1; then
182 utsrelease=linux/version.h
183 elif test -r $utsrelease2 && fgrep -q UTS_RELEASE $utsrelease2; then
184 utsrelease=linux/utsrelease.h
185 elif test -r $utsrelease3 && fgrep -q UTS_RELEASE $utsrelease3; then
186 utsrelease=generated/utsrelease.h
189 if test "$utsrelease"; then
190 kernsrcver=`(echo "#include <$utsrelease>";
191 echo "kernsrcver=UTS_RELEASE") |
192 cpp -I $kernelbuild/include |
193 grep "^kernsrcver=" | cut -d \" -f 2`
195 if test -z "$kernsrcver"; then
196 AC_MSG_RESULT([Not found])
197 AC_MSG_ERROR([*** Cannot determine kernel version.])
200 AC_MSG_RESULT([Not found])
201 if test "x$enable_linux_builtin" != xyes; then
202 AC_MSG_ERROR([*** Cannot find UTS_RELEASE definition.])
205 *** Cannot find UTS_RELEASE definition.
206 *** Please run 'make prepare' inside the kernel source tree.])
210 AC_MSG_RESULT([$kernsrcver])
213 LINUX_OBJ=${kernelbuild}
214 LINUX_VERSION=${kernsrcver}
218 AC_SUBST(LINUX_VERSION)
220 SPL_AC_MODULE_SYMVERS
224 dnl # Default SPL user configuration
226 AC_DEFUN([SPL_AC_CONFIG_USER], [])
229 dnl # Check for rpm+rpmbuild to build RPM packages. If these tools
230 dnl # are missing it is non-fatal but you will not be able to build
231 dnl # RPM packages and will be warned if you try too.
233 AC_DEFUN([SPL_AC_RPM], [
237 AC_MSG_CHECKING([whether $RPM is available])
238 AS_IF([tmp=$($RPM --version 2>/dev/null)], [
239 RPM_VERSION=$(echo $tmp | $AWK '/RPM/ { print $[3] }')
241 AC_MSG_RESULT([$HAVE_RPM ($RPM_VERSION)])
244 AC_MSG_RESULT([$HAVE_RPM])
247 AC_MSG_CHECKING([whether $RPMBUILD is available])
248 AS_IF([tmp=$($RPMBUILD --version 2>/dev/null)], [
249 RPMBUILD_VERSION=$(echo $tmp | $AWK '/RPM/ { print $[3] }')
251 AC_MSG_RESULT([$HAVE_RPMBUILD ($RPMBUILD_VERSION)])
254 AC_MSG_RESULT([$HAVE_RPMBUILD])
259 AC_SUBST(RPM_VERSION)
261 AC_SUBST(HAVE_RPMBUILD)
263 AC_SUBST(RPMBUILD_VERSION)
267 dnl # Check for dpkg+dpkg-buildpackage to build DEB packages. If these
268 dnl # tools are missing it is non-fatal but you will not be able to build
269 dnl # DEB packages and will be warned if you try too.
271 AC_DEFUN([SPL_AC_DPKG], [
273 DPKGBUILD=dpkg-buildpackage
275 AC_MSG_CHECKING([whether $DPKG is available])
276 AS_IF([tmp=$($DPKG --version 2>/dev/null)], [
277 DPKG_VERSION=$(echo $tmp | $AWK '/Debian/ { print $[7] }')
279 AC_MSG_RESULT([$HAVE_DPKG ($DPKG_VERSION)])
282 AC_MSG_RESULT([$HAVE_DPKG])
285 AC_MSG_CHECKING([whether $DPKGBUILD is available])
286 AS_IF([tmp=$($DPKGBUILD --version 2>/dev/null)], [
287 DPKGBUILD_VERSION=$(echo $tmp | \
288 $AWK '/Debian/ { print $[4] }' | cut -f-4 -d'.')
290 AC_MSG_RESULT([$HAVE_DPKGBUILD ($DPKGBUILD_VERSION)])
293 AC_MSG_RESULT([$HAVE_DPKGBUILD])
298 AC_SUBST(DPKG_VERSION)
300 AC_SUBST(HAVE_DPKGBUILD)
302 AC_SUBST(DPKGBUILD_VERSION)
306 dnl # Until native packaging for various different packing systems
307 dnl # can be added the least we can do is attempt to use alien to
308 dnl # convert the RPM packages to the needed package type. This is
309 dnl # a hack but so far it has worked reasonable well.
311 AC_DEFUN([SPL_AC_ALIEN], [
314 AC_MSG_CHECKING([whether $ALIEN is available])
315 AS_IF([tmp=$($ALIEN --version 2>/dev/null)], [
316 ALIEN_VERSION=$(echo $tmp | $AWK '{ print $[3] }')
318 AC_MSG_RESULT([$HAVE_ALIEN ($ALIEN_VERSION)])
321 AC_MSG_RESULT([$HAVE_ALIEN])
326 AC_SUBST(ALIEN_VERSION)
330 dnl # Using the VENDOR tag from config.guess set the default
331 dnl # package type for 'make pkg': (rpm | deb | tgz)
333 AC_DEFUN([SPL_AC_DEFAULT_PACKAGE], [
334 AC_MSG_CHECKING([linux distribution])
335 if test -f /etc/toss-release ; then
337 elif test -f /etc/fedora-release ; then
339 elif test -f /etc/redhat-release ; then
341 elif test -f /etc/gentoo-release ; then
343 elif test -f /etc/arch-release ; then
345 elif test -f /etc/SuSE-release ; then
347 elif test -f /etc/slackware-version ; then
349 elif test -f /etc/lunar.release ; then
351 elif test -f /etc/lsb-release ; then
353 elif test -f /etc/debian_version ; then
358 AC_MSG_RESULT([$VENDOR])
361 AC_MSG_CHECKING([default package type])
363 toss) DEFAULT_PACKAGE=rpm ;;
364 redhat) DEFAULT_PACKAGE=rpm ;;
365 fedora) DEFAULT_PACKAGE=rpm ;;
366 gentoo) DEFAULT_PACKAGE=tgz ;;
367 arch) DEFAULT_PACKAGE=tgz ;;
368 sles) DEFAULT_PACKAGE=rpm ;;
369 slackware) DEFAULT_PACKAGE=tgz ;;
370 lunar) DEFAULT_PACKAGE=tgz ;;
371 ubuntu) DEFAULT_PACKAGE=deb ;;
372 debian) DEFAULT_PACKAGE=deb ;;
373 *) DEFAULT_PACKAGE=rpm ;;
376 AC_MSG_RESULT([$DEFAULT_PACKAGE])
377 AC_SUBST(DEFAULT_PACKAGE)
381 dnl # Default SPL user configuration
383 AC_DEFUN([SPL_AC_PACKAGE], [
384 SPL_AC_DEFAULT_PACKAGE
390 AC_DEFUN([SPL_AC_LICENSE], [
391 AC_MSG_CHECKING([spl license])
393 AC_MSG_RESULT([$LICENSE])
394 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DHAVE_GPL_ONLY_SYMBOLS"
398 AC_DEFUN([SPL_AC_CONFIG], [
400 AC_ARG_WITH([config],
401 AS_HELP_STRING([--with-config=CONFIG],
402 [Config file 'kernel|user|all|srpm']),
403 [SPL_CONFIG="$withval"])
404 AC_ARG_ENABLE([linux-builtin],
405 [AC_HELP_STRING([--enable-linux-builtin],
406 [Configure for builtin in-tree kernel modules @<:@default=no@:>@])],
408 [enable_linux_builtin=no])
410 AC_MSG_CHECKING([spl config])
411 AC_MSG_RESULT([$SPL_CONFIG]);
414 case "$SPL_CONFIG" in
415 kernel) SPL_AC_CONFIG_KERNEL ;;
416 user) SPL_AC_CONFIG_USER ;;
417 all) SPL_AC_CONFIG_KERNEL
418 SPL_AC_CONFIG_USER ;;
421 AC_MSG_RESULT([Error!])
422 AC_MSG_ERROR([Bad value "$SPL_CONFIG" for --with-config,
423 user kernel|user|all|srpm]) ;;
426 AM_CONDITIONAL([CONFIG_USER],
427 [test "$SPL_CONFIG" = user -o "$SPL_CONFIG" = all])
428 AM_CONDITIONAL([CONFIG_KERNEL],
429 [test "$SPL_CONFIG" = kernel -o "$SPL_CONFIG" = all] &&
430 [test "x$enable_linux_builtin" != xyes ])
434 dnl # Enable if the SPL should be compiled with internal debugging enabled.
435 dnl # By default this support is disabled.
437 AC_DEFUN([SPL_AC_DEBUG], [
438 AC_MSG_CHECKING([whether debugging is enabled])
439 AC_ARG_ENABLE([debug],
440 [AS_HELP_STRING([--enable-debug],
441 [Enable generic debug support @<:@default=no@:>@])],
445 AS_IF([test "x$enable_debug" = xyes],
447 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG -Werror"
448 DEBUG_CFLAGS="-DDEBUG -Werror"
449 DEBUG_SPL="_with_debug"
451 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DNDEBUG"
452 DEBUG_CFLAGS="-DNDEBUG"
453 DEBUG_SPL="_without_debug"
456 AC_SUBST(DEBUG_CFLAGS)
458 AC_MSG_RESULT([$enable_debug])
462 dnl # Enabled by default it provides a basic debug log infrastructure.
463 dnl # Each subsystem registers itself with a name and logs messages
464 dnl # using predefined types. If the debug mask it set to allow the
465 dnl # message type it will be written to the internal log. The log
466 dnl # can be dumped to a file by echoing 1 to the 'dump' proc entry,
467 dnl # after dumping the log it must be decoded using the spl utility.
469 dnl # echo 1 >/proc/sys/kernel/spl/debug/dump
470 dnl # spl /tmp/spl-log.xxx.yyy /tmp/spl-log.xxx.yyy.txt
472 AC_DEFUN([SPL_AC_DEBUG_LOG], [
473 AC_ARG_ENABLE([debug-log],
474 [AS_HELP_STRING([--enable-debug-log],
475 [Enable basic debug logging @<:@default=yes@:>@])],
477 [enable_debug_log=yes])
479 AS_IF([test "x$enable_debug_log" = xyes],
481 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_LOG"
482 DEBUG_LOG="_with_debug_log"
483 AC_DEFINE([DEBUG_LOG], [1],
484 [Define to 1 to enable basic debug logging])
486 DEBUG_LOG="_without_debug_log"
490 AC_MSG_CHECKING([whether basic debug logging is enabled])
491 AC_MSG_RESULT([$enable_debug_log])
495 dnl # Enabled by default it provides a minimal level of memory tracking.
496 dnl # A total count of bytes allocated is kept for each alloc and free.
497 dnl # Then at module unload time a report to the console will be printed
498 dnl # if memory was leaked. Additionally, /proc/spl/kmem/slab will exist
499 dnl # and provide an easy way to inspect the kmem based slab.
501 AC_DEFUN([SPL_AC_DEBUG_KMEM], [
502 AC_ARG_ENABLE([debug-kmem],
503 [AS_HELP_STRING([--enable-debug-kmem],
504 [Enable basic kmem accounting @<:@default=yes@:>@])],
506 [enable_debug_kmem=yes])
508 AS_IF([test "x$enable_debug_kmem" = xyes],
510 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_KMEM"
511 DEBUG_KMEM="_with_debug_kmem"
512 AC_DEFINE([DEBUG_KMEM], [1],
513 [Define to 1 to enable basic kmem accounting])
515 DEBUG_KMEM="_without_debug_kmem"
519 AC_MSG_CHECKING([whether basic kmem accounting is enabled])
520 AC_MSG_RESULT([$enable_debug_kmem])
524 dnl # Disabled by default it provides detailed memory tracking. This
525 dnl # feature also requires --enable-debug-kmem to be set. When enabled
526 dnl # not only will total bytes be tracked but also the location of every
527 dnl # alloc and free. When the SPL module is unloaded a list of all leaked
528 dnl # addresses and where they were allocated will be dumped to the console.
529 dnl # Enabling this feature has a significant impact on performance but it
530 dnl # makes finding memory leaks pretty straight forward.
532 AC_DEFUN([SPL_AC_DEBUG_KMEM_TRACKING], [
533 AC_ARG_ENABLE([debug-kmem-tracking],
534 [AS_HELP_STRING([--enable-debug-kmem-tracking],
535 [Enable detailed kmem tracking @<:@default=no@:>@])],
537 [enable_debug_kmem_tracking=no])
539 AS_IF([test "x$enable_debug_kmem_tracking" = xyes],
541 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_KMEM_TRACKING"
542 DEBUG_KMEM_TRACKING="_with_debug_kmem_tracking"
543 AC_DEFINE([DEBUG_KMEM_TRACKING], [1],
544 [Define to 1 to enable detailed kmem tracking])
546 DEBUG_KMEM_TRACKING="_without_debug_kmem_tracking"
549 AC_SUBST(DEBUG_KMEM_TRACKING)
550 AC_MSG_CHECKING([whether detailed kmem tracking is enabled])
551 AC_MSG_RESULT([$enable_debug_kmem_tracking])
555 dnl # SPL_LINUX_CONFTEST
557 AC_DEFUN([SPL_LINUX_CONFTEST], [
558 cat confdefs.h - <<_ACEOF >conftest.c
564 dnl # SPL_LANG_PROGRAM(C)([PROLOGUE], [BODY])
566 m4_define([SPL_LANG_PROGRAM], [
571 dnl Do *not* indent the following line: there may be CPP directives.
572 dnl Don't move the `;' right after for the same reason.
580 dnl # SPL_LINUX_COMPILE_IFELSE / like AC_COMPILE_IFELSE
582 AC_DEFUN([SPL_LINUX_COMPILE_IFELSE], [
583 m4_ifvaln([$1], [SPL_LINUX_CONFTEST([$1])])
584 rm -Rf build && mkdir -p build && touch build/conftest.mod.c
585 echo "obj-m := conftest.o" >build/Makefile
587 test "x$enable_linux_builtin" = xyes && modpost_flag='modpost=true' # fake modpost stage
589 [AC_TRY_COMMAND(cp conftest.c build && make [$2] -C $LINUX_OBJ EXTRA_CFLAGS="-Werror-implicit-function-declaration $EXTRA_KCFLAGS" $ARCH_UM M=$PWD/build $modpost_flag) >/dev/null && AC_TRY_COMMAND([$3])],
591 [_AC_MSG_LOG_CONFTEST m4_ifvaln([$5],[$5])]
597 dnl # SPL_LINUX_TRY_COMPILE like AC_TRY_COMPILE
599 AC_DEFUN([SPL_LINUX_TRY_COMPILE],
600 [SPL_LINUX_COMPILE_IFELSE(
601 [AC_LANG_SOURCE([SPL_LANG_PROGRAM([[$1]], [[$2]])])],
603 [test -s build/conftest.o],
608 dnl # SPL_CHECK_SYMBOL_EXPORT
609 dnl # check symbol exported or not
611 AC_DEFUN([SPL_CHECK_SYMBOL_EXPORT], [
612 grep -q -E '[[[:space:]]]$1[[[:space:]]]' \
613 $LINUX_OBJ/Module*.symvers 2>/dev/null
615 if test $rc -ne 0; then
618 grep -q -E "EXPORT_SYMBOL.*($1)" \
619 "$LINUX_OBJ/$file" 2>/dev/null
621 if test $rc -eq 0; then
626 if test $export -eq 0; then :
637 dnl # SPL_LINUX_TRY_COMPILE_SYMBOL
638 dnl # like SPL_LINUX_TRY_COMPILE, except SPL_CHECK_SYMBOL_EXPORT
639 dnl # is called if not compiling for builtin
641 AC_DEFUN([SPL_LINUX_TRY_COMPILE_SYMBOL], [
642 SPL_LINUX_TRY_COMPILE([$1], [$2], [rc=0], [rc=1])
643 if test $rc -ne 0; then :
646 if test "x$enable_linux_builtin" != xyes; then
647 SPL_CHECK_SYMBOL_EXPORT([$3], [$4], [rc=0], [rc=1])
649 if test $rc -ne 0; then :
658 dnl # SPL_CHECK_SYMBOL_HEADER
659 dnl # check if a symbol prototype is defined in listed headers.
661 AC_DEFUN([SPL_CHECK_SYMBOL_HEADER], [
662 AC_MSG_CHECKING([whether symbol $1 exists in header])
665 grep -q "$2" "$LINUX/$file" 2>/dev/null
667 if test $rc -eq 0; then
672 if test $header -eq 0; then
682 dnl # SPL_CHECK_HEADER
683 dnl # check whether header exists and define HAVE_$2_HEADER
685 AC_DEFUN([SPL_CHECK_HEADER],
686 [AC_MSG_CHECKING([whether header $1 exists])
687 SPL_LINUX_TRY_COMPILE([
692 AC_DEFINE(HAVE_$2_HEADER, 1, [$1 exists])
702 dnl # Basic toolchain sanity check.
704 AC_DEFUN([SPL_AC_TEST_MODULE],
705 [AC_MSG_CHECKING([whether modules can be built])
706 SPL_LINUX_TRY_COMPILE([],[],[
710 if test "x$enable_linux_builtin" != xyes; then
711 AC_MSG_ERROR([*** Unable to build an empty module.])
714 *** Unable to build an empty module.
715 *** Please run 'make scripts' inside the kernel source tree.])
721 dnl # Use the atomic implemenation based on global spinlocks. This
722 dnl # should only be needed by 32-bit kernels which do not provide
723 dnl # the atomic64_* API. It may be optionally enabled as a fallback
724 dnl # if problems are observed with the direct mapping to the native
725 dnl # Linux atomic operations. You may not disable atomic spinlocks
726 dnl # if you kernel does not an atomic64_* API.
728 AC_DEFUN([SPL_AC_ATOMIC_SPINLOCK], [
729 AC_ARG_ENABLE([atomic-spinlocks],
730 [AS_HELP_STRING([--enable-atomic-spinlocks],
731 [Atomic types use spinlocks @<:@default=check@:>@])],
733 [enable_atomic_spinlocks=check])
735 SPL_LINUX_TRY_COMPILE([
736 #include <linux/fs.h>
738 atomic64_t *ptr __attribute__ ((unused));
741 AC_DEFINE(HAVE_ATOMIC64_T, 1,
742 [kernel defines atomic64_t])
747 AS_IF([test "x$enable_atomic_spinlocks" = xcheck], [
748 AS_IF([test "x$have_atomic64_t" = xyes], [
749 enable_atomic_spinlocks=no
751 enable_atomic_spinlocks=yes
755 AS_IF([test "x$enable_atomic_spinlocks" = xyes], [
756 AC_DEFINE([ATOMIC_SPINLOCK], [1],
757 [Atomic types use spinlocks])
759 AS_IF([test "x$have_atomic64_t" = xno], [
761 [--disable-atomic-spinlocks given but required atomic64 support is unavailable])
765 AC_MSG_CHECKING([whether atomic types use spinlocks])
766 AC_MSG_RESULT([$enable_atomic_spinlocks])
768 AC_MSG_CHECKING([whether kernel defines atomic64_t])
769 AC_MSG_RESULT([$have_atomic64_t])
773 dnl # 2.6.24 API change,
774 dnl # check if atomic64_cmpxchg is defined
776 AC_DEFUN([SPL_AC_TYPE_ATOMIC64_CMPXCHG],
777 [AC_MSG_CHECKING([whether kernel defines atomic64_cmpxchg])
778 SPL_LINUX_TRY_COMPILE([
779 #include <linux/fs.h>
781 atomic64_cmpxchg((atomic64_t *)NULL, 0, 0);
784 AC_DEFINE(HAVE_ATOMIC64_CMPXCHG, 1,
785 [kernel defines atomic64_cmpxchg])
792 dnl # 2.6.24 API change,
793 dnl # check if atomic64_xchg is defined
795 AC_DEFUN([SPL_AC_TYPE_ATOMIC64_XCHG],
796 [AC_MSG_CHECKING([whether kernel defines atomic64_xchg])
797 SPL_LINUX_TRY_COMPILE([
798 #include <linux/fs.h>
800 atomic64_xchg((atomic64_t *)NULL, 0);
803 AC_DEFINE(HAVE_ATOMIC64_XCHG, 1,
804 [kernel defines atomic64_xchg])
811 dnl # 2.6.24 API change,
812 dnl # check if uintptr_t typedef is defined
814 AC_DEFUN([SPL_AC_TYPE_UINTPTR_T],
815 [AC_MSG_CHECKING([whether kernel defines uintptr_t])
816 SPL_LINUX_TRY_COMPILE([
817 #include <linux/types.h>
819 uintptr_t *ptr __attribute__ ((unused));
822 AC_DEFINE(HAVE_UINTPTR_T, 1,
823 [kernel defines uintptr_t])
830 dnl # 2.6.21 API change,
831 dnl # 'register_sysctl_table' use only one argument instead of two
833 AC_DEFUN([SPL_AC_2ARGS_REGISTER_SYSCTL],
834 [AC_MSG_CHECKING([whether register_sysctl_table() wants 2 args])
835 SPL_LINUX_TRY_COMPILE([
836 #include <linux/sysctl.h>
838 (void) register_sysctl_table(NULL, 0);
841 AC_DEFINE(HAVE_2ARGS_REGISTER_SYSCTL, 1,
842 [register_sysctl_table() wants 2 args])
849 dnl # 2.6.23 API change
850 dnl # Old set_shrinker API replaced with register_shrinker
852 AC_DEFUN([SPL_AC_SET_SHRINKER], [
853 AC_MSG_CHECKING([whether set_shrinker() available])
854 SPL_LINUX_TRY_COMPILE([
855 #include <linux/mm.h>
857 return set_shrinker(DEFAULT_SEEKS, NULL);
860 AC_DEFINE(HAVE_SET_SHRINKER, 1,
861 [set_shrinker() available])
868 dnl # 2.6.35 API change,
869 dnl # Add context to shrinker callback
871 AC_DEFUN([SPL_AC_3ARGS_SHRINKER_CALLBACK],
872 [AC_MSG_CHECKING([whether shrinker callback wants 3 args])
873 tmp_flags="$EXTRA_KCFLAGS"
874 EXTRA_KCFLAGS="-Werror"
875 SPL_LINUX_TRY_COMPILE([
876 #include <linux/mm.h>
878 int shrinker_cb(struct shrinker *, int, unsigned int);
880 struct shrinker cache_shrinker = {
881 .shrink = shrinker_cb,
882 .seeks = DEFAULT_SEEKS,
884 register_shrinker(&cache_shrinker);
887 AC_DEFINE(HAVE_3ARGS_SHRINKER_CALLBACK, 1,
888 [shrinker callback wants 3 args])
892 EXTRA_KCFLAGS="$tmp_flags"
896 dnl # 2.6.25 API change,
897 dnl # struct path entry added to struct nameidata
899 AC_DEFUN([SPL_AC_PATH_IN_NAMEIDATA],
900 [AC_MSG_CHECKING([whether struct path used in struct nameidata])
901 SPL_LINUX_TRY_COMPILE([
902 #include <linux/namei.h>
904 struct nameidata nd __attribute__ ((unused));
907 nd.path.dentry = NULL;
910 AC_DEFINE(HAVE_PATH_IN_NAMEIDATA, 1,
911 [struct path used in struct nameidata])
918 dnl # Custom SPL patch may export this system it is not required
920 AC_DEFUN([SPL_AC_TASK_CURR],
921 [AC_MSG_CHECKING([whether task_curr() is available])
922 SPL_LINUX_TRY_COMPILE_SYMBOL([
923 #include <linux/sched.h>
926 ], [task_curr], [kernel/sched.c], [
928 AC_DEFINE(HAVE_TASK_CURR, 1, [task_curr() is available])
935 dnl # 2.6.19 API change,
936 dnl # Use CTL_UNNUMBERED when binary sysctl is not required
938 AC_DEFUN([SPL_AC_CTL_UNNUMBERED],
939 [AC_MSG_CHECKING([whether unnumbered sysctl support exists])
940 SPL_LINUX_TRY_COMPILE([
941 #include <linux/sysctl.h>
943 #ifndef CTL_UNNUMBERED
944 #error CTL_UNNUMBERED undefined
948 AC_DEFINE(HAVE_CTL_UNNUMBERED, 1,
949 [unnumbered sysctl support exists])
956 dnl # 2.6.33 API change,
957 dnl # Removed .ctl_name from struct ctl_table.
959 AC_DEFUN([SPL_AC_CTL_NAME], [
960 AC_MSG_CHECKING([whether struct ctl_table has ctl_name])
961 SPL_LINUX_TRY_COMPILE([
962 #include <linux/sysctl.h>
964 struct ctl_table ctl __attribute__ ((unused));
968 AC_DEFINE(HAVE_CTL_NAME, 1, [struct ctl_table has ctl_name])
975 dnl # 2.6.16 API change.
976 dnl # Check if 'fls64()' is available
978 AC_DEFUN([SPL_AC_FLS64],
979 [AC_MSG_CHECKING([whether fls64() is available])
980 SPL_LINUX_TRY_COMPILE([
981 #include <linux/bitops.h>
986 AC_DEFINE(HAVE_FLS64, 1, [fls64() is available])
993 dnl # 2.6.18 API change, check whether device_create() is available.
994 dnl # Device_create() was introduced in 2.6.18 and depricated
995 dnl # class_device_create() which was fully removed in 2.6.26.
997 AC_DEFUN([SPL_AC_DEVICE_CREATE],
998 [AC_MSG_CHECKING([whether device_create() is available])
999 SPL_CHECK_SYMBOL_EXPORT([device_create], [drivers/base/core.c], [
1001 AC_DEFINE(HAVE_DEVICE_CREATE, 1,
1002 [device_create() is available])
1009 dnl # 2.6.27 API change,
1010 dnl # device_create() uses 5 args, new 'drvdata' argument.
1012 AC_DEFUN([SPL_AC_5ARGS_DEVICE_CREATE], [
1013 AC_MSG_CHECKING([whether device_create() wants 5 args])
1014 tmp_flags="$EXTRA_KCFLAGS"
1015 EXTRA_KCFLAGS="-Werror"
1016 SPL_LINUX_TRY_COMPILE([
1017 #include <linux/device.h>
1019 device_create(NULL, NULL, 0, NULL, "%d", 1);
1022 AC_DEFINE(HAVE_5ARGS_DEVICE_CREATE, 1,
1023 [device_create wants 5 args])
1027 EXTRA_KCFLAGS="$tmp_flags"
1031 dnl # 2.6.13 API change, check whether class_device_create() is available.
1032 dnl # Class_device_create() was introduced in 2.6.13 and depricated
1033 dnl # class_simple_device_add() which was fully removed in 2.6.13.
1035 AC_DEFUN([SPL_AC_CLASS_DEVICE_CREATE],
1036 [AC_MSG_CHECKING([whether class_device_create() is available])
1037 SPL_LINUX_TRY_COMPILE_SYMBOL([
1038 #include <linux/device.h>
1040 class_device_create(NULL, NULL, 0, NULL, NULL);
1041 ], [class_device_create], [drivers/base/class.c], [
1043 AC_DEFINE(HAVE_CLASS_DEVICE_CREATE, 1,
1044 [class_device_create() is available])
1051 dnl # 2.6.26 API change, set_normalized_timespec() is exported.
1053 AC_DEFUN([SPL_AC_SET_NORMALIZED_TIMESPEC_EXPORT],
1054 [AC_MSG_CHECKING([whether set_normalized_timespec() is available as export])
1055 SPL_LINUX_TRY_COMPILE_SYMBOL([
1056 #include <linux/time.h>
1058 set_normalized_timespec(NULL, 0, 0);
1059 ], [set_normalized_timespec], [kernel/time.c], [
1061 AC_DEFINE(HAVE_SET_NORMALIZED_TIMESPEC_EXPORT, 1,
1062 [set_normalized_timespec() is available as export])
1069 dnl # 2.6.16 API change, set_normalize_timespec() moved to time.c
1070 dnl # previously it was available in time.h as an inline.
1072 AC_DEFUN([SPL_AC_SET_NORMALIZED_TIMESPEC_INLINE], [
1073 AC_MSG_CHECKING([whether set_normalized_timespec() is an inline])
1074 SPL_LINUX_TRY_COMPILE([
1075 #include <linux/time.h>
1076 void set_normalized_timespec(struct timespec *ts,
1077 time_t sec, long nsec) { }
1084 AC_DEFINE(HAVE_SET_NORMALIZED_TIMESPEC_INLINE, 1,
1085 [set_normalized_timespec() is available as inline])
1090 dnl # 2.6.18 API change,
1091 dnl # timespec_sub() inline function available in linux/time.h
1093 AC_DEFUN([SPL_AC_TIMESPEC_SUB], [
1094 AC_MSG_CHECKING([whether timespec_sub() is available])
1095 SPL_LINUX_TRY_COMPILE([
1096 #include <linux/time.h>
1098 struct timespec a = { 0 };
1099 struct timespec b = { 0 };
1100 struct timespec c __attribute__ ((unused));
1101 c = timespec_sub(a, b);
1104 AC_DEFINE(HAVE_TIMESPEC_SUB, 1, [timespec_sub() is available])
1111 dnl # 2.6.19 API change,
1112 dnl # check if init_utsname() is available in linux/utsname.h
1114 AC_DEFUN([SPL_AC_INIT_UTSNAME], [
1115 AC_MSG_CHECKING([whether init_utsname() is available])
1116 SPL_LINUX_TRY_COMPILE([
1117 #include <linux/utsname.h>
1119 struct new_utsname *a __attribute__ ((unused));
1123 AC_DEFINE(HAVE_INIT_UTSNAME, 1, [init_utsname() is available])
1130 dnl # 2.6.18 API change,
1131 dnl # added linux/uaccess.h
1133 AC_DEFUN([SPL_AC_UACCESS_HEADER], [
1134 SPL_CHECK_HEADER([linux/uaccess.h], [UACCESS], [], [])
1138 dnl # 2.6.12 API change,
1139 dnl # check whether 'kmalloc_node()' is available.
1141 AC_DEFUN([SPL_AC_KMALLOC_NODE], [
1142 AC_MSG_CHECKING([whether kmalloc_node() is available])
1143 SPL_LINUX_TRY_COMPILE([
1144 #include <linux/slab.h>
1146 void *a __attribute__ ((unused));
1147 a = kmalloc_node(1, GFP_KERNEL, 0);
1150 AC_DEFINE(HAVE_KMALLOC_NODE, 1, [kmalloc_node() is available])
1157 dnl # 2.6.9 API change,
1158 dnl # check whether 'monotonic_clock()' is available it may
1159 dnl # be available for some archs but not others.
1161 AC_DEFUN([SPL_AC_MONOTONIC_CLOCK],
1162 [AC_MSG_CHECKING([whether monotonic_clock() is available])
1163 SPL_LINUX_TRY_COMPILE_SYMBOL([
1164 #include <linux/timex.h>
1167 ], [monotonic_clock], [], [
1169 AC_DEFINE(HAVE_MONOTONIC_CLOCK, 1,
1170 [monotonic_clock() is available])
1177 dnl # 2.6.16 API change,
1178 dnl # check whether 'struct inode' has i_mutex
1180 AC_DEFUN([SPL_AC_INODE_I_MUTEX], [
1181 AC_MSG_CHECKING([whether struct inode has i_mutex])
1182 SPL_LINUX_TRY_COMPILE([
1183 #include <linux/fs.h>
1184 #include <linux/mutex.h>
1187 mutex_init(&i.i_mutex);
1190 AC_DEFINE(HAVE_INODE_I_MUTEX, 1, [struct inode has i_mutex])
1197 dnl # 2.6.29 API change,
1198 dnl # Adaptive mutexs introduced.
1200 AC_DEFUN([SPL_AC_MUTEX_OWNER], [
1201 AC_MSG_CHECKING([whether struct mutex has owner])
1202 SPL_LINUX_TRY_COMPILE([
1203 #include <linux/mutex.h>
1205 struct mutex mtx __attribute__ ((unused));
1209 AC_DEFINE(HAVE_MUTEX_OWNER, 1, [struct mutex has owner])
1216 dnl # 2.6.39 API change,
1217 dnl # Owner type change. A Linux mutex prior to 2.6.39 would store
1218 dnl # the owner as a thread_info pointer when CONFIG_DEBUG_MUTEXES
1219 dnl # was defined. As of 2.6.39 this was changed to a task_struct
1220 dnl # pointer which frankly makes a lot more sense.
1222 AC_DEFUN([SPL_AC_MUTEX_OWNER_TASK_STRUCT], [
1223 AC_MSG_CHECKING([whether struct mutex owner is a task_struct])
1224 tmp_flags="$EXTRA_KCFLAGS"
1225 EXTRA_KCFLAGS="-Werror"
1226 SPL_LINUX_TRY_COMPILE([
1227 #include <linux/mutex.h>
1228 #include <linux/sched.h>
1230 struct mutex mtx __attribute__ ((unused));
1231 mtx.owner = current;
1234 AC_DEFINE(HAVE_MUTEX_OWNER_TASK_STRUCT, 1,
1235 [struct mutex owner is a task_struct])
1239 EXTRA_KCFLAGS="$tmp_flags"
1243 dnl # 2.6.18 API change,
1244 dnl # First introduced 'mutex_lock_nested()' in include/linux/mutex.h,
1245 dnl # as part of the mutex validator. Fallback to using 'mutex_lock()'
1246 dnl # if the mutex validator is disabled or otherwise unavailable.
1248 AC_DEFUN([SPL_AC_MUTEX_LOCK_NESTED], [
1249 AC_MSG_CHECKING([whether mutex_lock_nested() is available])
1250 SPL_LINUX_TRY_COMPILE([
1251 #include <linux/mutex.h>
1255 mutex_lock_nested(&mutex, 0);
1258 AC_DEFINE(HAVE_MUTEX_LOCK_NESTED, 1,
1259 [mutex_lock_nested() is available])
1266 dnl # 2.6.27 API change,
1267 dnl # on_each_cpu() uses 3 args, no 'retry' argument
1269 AC_DEFUN([SPL_AC_3ARGS_ON_EACH_CPU], [
1270 AC_MSG_CHECKING([whether on_each_cpu() wants 3 args])
1271 SPL_LINUX_TRY_COMPILE([
1272 #include <linux/interrupt.h>
1273 #include <linux/smp.h>
1275 void on_each_cpu_func(void *data) { return; }
1277 on_each_cpu(on_each_cpu_func, NULL, 0);
1280 AC_DEFINE(HAVE_3ARGS_ON_EACH_CPU, 1,
1281 [on_each_cpu wants 3 args])
1288 dnl # 2.6.18 API change,
1289 dnl # kallsyms_lookup_name no longer exported
1291 AC_DEFUN([SPL_AC_KALLSYMS_LOOKUP_NAME],
1292 [AC_MSG_CHECKING([whether kallsyms_lookup_name() is available])
1293 SPL_LINUX_TRY_COMPILE_SYMBOL([
1294 #include <linux/kallsyms.h>
1296 kallsyms_lookup_name(NULL);
1297 ], [kallsyms_lookup_name], [], [
1299 AC_DEFINE(HAVE_KALLSYMS_LOOKUP_NAME, 1,
1300 [kallsyms_lookup_name() is available])
1307 dnl # Proposed API change,
1308 dnl # This symbol is not available in stock kernels. You may build a
1309 dnl # custom kernel with the *-spl-export-symbols.patch which will export
1310 dnl # these symbols for use. If your already rolling a custom kernel for
1311 dnl # your environment this is recommended.
1313 AC_DEFUN([SPL_AC_GET_VMALLOC_INFO],
1314 [AC_MSG_CHECKING([whether get_vmalloc_info() is available])
1315 SPL_CHECK_SYMBOL_EXPORT([get_vmalloc_info], [], [
1317 AC_DEFINE(HAVE_GET_VMALLOC_INFO, 1,
1318 [get_vmalloc_info() is available])
1325 dnl # 2.6.17 API change
1326 dnl # The helper functions first_online_pgdat(), next_online_pgdat(), and
1327 dnl # next_zone() are introduced to simplify for_each_zone(). These symbols
1328 dnl # were exported in 2.6.17 for use by modules which was consistent with
1329 dnl # the previous implementation of for_each_zone(). From 2.6.18 - 2.6.19
1330 dnl # the symbols were exported as 'unused', and by 2.6.20 they exports
1331 dnl # were dropped entirely leaving modules no way to directly iterate over
1332 dnl # the zone list. Because we need access to the zone helpers we check
1333 dnl # if the kernel contains the old or new implementation. Then we check
1334 dnl # to see if the symbols we need for each version are available. If they
1335 dnl # are not, dynamically aquire the addresses with kallsyms_lookup_name().
1337 AC_DEFUN([SPL_AC_PGDAT_HELPERS], [
1338 AC_MSG_CHECKING([whether symbol *_pgdat exist])
1339 grep -q -E 'first_online_pgdat' $LINUX/include/linux/mmzone.h 2>/dev/null
1341 if test $rc -eq 0; then
1342 AC_MSG_RESULT([yes])
1343 AC_DEFINE(HAVE_PGDAT_HELPERS, 1, [pgdat helpers are available])
1350 dnl # Proposed API change,
1351 dnl # This symbol is not available in stock kernels. You may build a
1352 dnl # custom kernel with the *-spl-export-symbols.patch which will export
1353 dnl # these symbols for use. If your already rolling a custom kernel for
1354 dnl # your environment this is recommended.
1356 AC_DEFUN([SPL_AC_FIRST_ONLINE_PGDAT],
1357 [AC_MSG_CHECKING([whether first_online_pgdat() is available])
1358 SPL_LINUX_TRY_COMPILE_SYMBOL([
1359 #include <linux/mmzone.h>
1361 first_online_pgdat();
1362 ], [first_online_pgdat], [], [
1364 AC_DEFINE(HAVE_FIRST_ONLINE_PGDAT, 1,
1365 [first_online_pgdat() is available])
1372 dnl # Proposed API change,
1373 dnl # This symbol is not available in stock kernels. You may build a
1374 dnl # custom kernel with the *-spl-export-symbols.patch which will export
1375 dnl # these symbols for use. If your already rolling a custom kernel for
1376 dnl # your environment this is recommended.
1378 AC_DEFUN([SPL_AC_NEXT_ONLINE_PGDAT],
1379 [AC_MSG_CHECKING([whether next_online_pgdat() is available])
1380 SPL_LINUX_TRY_COMPILE_SYMBOL([
1381 #include <linux/mmzone.h>
1383 next_online_pgdat(NULL);
1384 ], [next_online_pgdat], [], [
1386 AC_DEFINE(HAVE_NEXT_ONLINE_PGDAT, 1,
1387 [next_online_pgdat() is available])
1394 dnl # Proposed API change,
1395 dnl # This symbol is not available in stock kernels. You may build a
1396 dnl # custom kernel with the *-spl-export-symbols.patch which will export
1397 dnl # these symbols for use. If your already rolling a custom kernel for
1398 dnl # your environment this is recommended.
1400 AC_DEFUN([SPL_AC_NEXT_ZONE],
1401 [AC_MSG_CHECKING([whether next_zone() is available])
1402 SPL_LINUX_TRY_COMPILE_SYMBOL([
1403 #include <linux/mmzone.h>
1406 ], [next_zone], [], [
1408 AC_DEFINE(HAVE_NEXT_ZONE, 1, [next_zone() is available])
1415 dnl # 2.6.17 API change,
1416 dnl # See SPL_AC_PGDAT_HELPERS for details.
1418 AC_DEFUN([SPL_AC_PGDAT_LIST],
1419 [AC_MSG_CHECKING([whether pgdat_list is available])
1420 SPL_LINUX_TRY_COMPILE_SYMBOL([
1421 #include <linux/topology.h>
1422 pg_data_t *tmp = pgdat_list;
1423 ], [], [pgdat_list], [], [
1425 AC_DEFINE(HAVE_PGDAT_LIST, 1, [pgdat_list is available])
1432 dnl # 2.6.18 API change,
1433 dnl # First introduced global_page_state() support as an inline.
1435 AC_DEFUN([SPL_AC_GLOBAL_PAGE_STATE], [
1436 AC_MSG_CHECKING([whether global_page_state() is available])
1437 SPL_LINUX_TRY_COMPILE([
1438 #include <linux/mm.h>
1440 unsigned long state __attribute__ ((unused));
1441 state = global_page_state(0);
1444 AC_DEFINE(HAVE_GLOBAL_PAGE_STATE, 1,
1445 [global_page_state() is available])
1452 dnl # 2.6.21 API change (plus subsequent naming convention changes),
1453 dnl # Public global zone stats now include a free page count. However
1454 dnl # the enumerated names of the counters have changed since this API
1455 dnl # was introduced. We need to deduce the corrent name to use. This
1456 dnl # replaces the priviate get_zone_counts() interface.
1458 dnl # NR_FREE_PAGES was available from 2.6.21 to current kernels, which
1459 dnl # is 2.6.30 as of when this was written.
1461 AC_DEFUN([SPL_AC_ZONE_STAT_ITEM_FREE], [
1462 AC_MSG_CHECKING([whether page state NR_FREE_PAGES is available])
1463 SPL_LINUX_TRY_COMPILE([
1464 #include <linux/mm.h>
1466 enum zone_stat_item zsi __attribute__ ((unused));
1467 zsi = NR_FREE_PAGES;
1470 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_FREE_PAGES, 1,
1471 [Page state NR_FREE_PAGES is available])
1478 dnl # 2.6.21 API change (plus subsequent naming convention changes),
1479 dnl # Public global zone stats now include an inactive page count. However
1480 dnl # the enumerated names of the counters have changed since this API
1481 dnl # was introduced. We need to deduce the corrent name to use. This
1482 dnl # replaces the priviate get_zone_counts() interface.
1484 dnl # NR_INACTIVE was available from 2.6.21 to 2.6.27 and included both
1485 dnl # anonymous and file inactive pages. As of 2.6.28 it was split in
1486 dnl # to NR_INACTIVE_ANON and NR_INACTIVE_FILE.
1488 AC_DEFUN([SPL_AC_ZONE_STAT_ITEM_INACTIVE], [
1489 AC_MSG_CHECKING([whether page state NR_INACTIVE is available])
1490 SPL_LINUX_TRY_COMPILE([
1491 #include <linux/mm.h>
1493 enum zone_stat_item zsi __attribute__ ((unused));
1497 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_INACTIVE, 1,
1498 [Page state NR_INACTIVE is available])
1503 AC_MSG_CHECKING([whether page state NR_INACTIVE_ANON is available])
1504 SPL_LINUX_TRY_COMPILE([
1505 #include <linux/mm.h>
1507 enum zone_stat_item zsi __attribute__ ((unused));
1508 zsi = NR_INACTIVE_ANON;
1511 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_ANON, 1,
1512 [Page state NR_INACTIVE_ANON is available])
1517 AC_MSG_CHECKING([whether page state NR_INACTIVE_FILE is available])
1518 SPL_LINUX_TRY_COMPILE([
1519 #include <linux/mm.h>
1521 enum zone_stat_item zsi __attribute__ ((unused));
1522 zsi = NR_INACTIVE_FILE;
1525 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_FILE, 1,
1526 [Page state NR_INACTIVE_FILE is available])
1533 dnl # 2.6.21 API change (plus subsequent naming convention changes),
1534 dnl # Public global zone stats now include an active page count. However
1535 dnl # the enumerated names of the counters have changed since this API
1536 dnl # was introduced. We need to deduce the corrent name to use. This
1537 dnl # replaces the priviate get_zone_counts() interface.
1539 dnl # NR_ACTIVE was available from 2.6.21 to 2.6.27 and included both
1540 dnl # anonymous and file active pages. As of 2.6.28 it was split in
1541 dnl # to NR_ACTIVE_ANON and NR_ACTIVE_FILE.
1543 AC_DEFUN([SPL_AC_ZONE_STAT_ITEM_ACTIVE], [
1544 AC_MSG_CHECKING([whether page state NR_ACTIVE is available])
1545 SPL_LINUX_TRY_COMPILE([
1546 #include <linux/mm.h>
1548 enum zone_stat_item zsi __attribute__ ((unused));
1552 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_ACTIVE, 1,
1553 [Page state NR_ACTIVE is available])
1558 AC_MSG_CHECKING([whether page state NR_ACTIVE_ANON is available])
1559 SPL_LINUX_TRY_COMPILE([
1560 #include <linux/mm.h>
1562 enum zone_stat_item zsi __attribute__ ((unused));
1563 zsi = NR_ACTIVE_ANON;
1566 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_ANON, 1,
1567 [Page state NR_ACTIVE_ANON is available])
1572 AC_MSG_CHECKING([whether page state NR_ACTIVE_FILE is available])
1573 SPL_LINUX_TRY_COMPILE([
1574 #include <linux/mm.h>
1576 enum zone_stat_item zsi __attribute__ ((unused));
1577 zsi = NR_ACTIVE_FILE;
1580 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_FILE, 1,
1581 [Page state NR_ACTIVE_FILE is available])
1588 dnl # Proposed API change for legacy kernels.
1589 dnl # This symbol is not available in older kernels. For kernels post
1590 dnl # 2.6.21 the global_page_state() API is used to get free/inactive/active
1591 dnl # page state information. This symbol is only used in legacy kernels
1592 dnl # any only as a last resort.
1594 AC_DEFUN([SPL_AC_GET_ZONE_COUNTS], [
1595 AC_MSG_CHECKING([whether symbol get_zone_counts is needed])
1596 SPL_LINUX_TRY_COMPILE([
1598 #if !defined(HAVE_ZONE_STAT_ITEM_NR_FREE_PAGES)
1599 #error "global_page_state needs NR_FREE_PAGES"
1602 #if !defined(HAVE_ZONE_STAT_ITEM_NR_ACTIVE) && \
1603 !defined(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_ANON) && \
1604 !defined(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_FILE)
1605 #error "global_page_state needs NR_ACTIVE*"
1608 #if !defined(HAVE_ZONE_STAT_ITEM_NR_INACTIVE) && \
1609 !defined(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_ANON) && \
1610 !defined(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_FILE)
1611 #error "global_page_state needs NR_INACTIVE*"
1617 AC_DEFINE(NEED_GET_ZONE_COUNTS, 1,
1618 [get_zone_counts() is needed])
1620 AC_MSG_CHECKING([whether get_zone_counts() is available])
1621 SPL_LINUX_TRY_COMPILE_SYMBOL([
1622 #include <linux/mmzone.h>
1624 get_zone_counts(NULL, NULL, NULL);
1625 ], [get_zone_counts], [], [
1627 AC_DEFINE(HAVE_GET_ZONE_COUNTS, 1,
1628 [get_zone_counts() is available])
1636 dnl # 2.6.27 API change,
1637 dnl # The user_path_dir() replaces __user_walk()
1639 AC_DEFUN([SPL_AC_USER_PATH_DIR],
1640 [AC_MSG_CHECKING([whether user_path_dir() is available])
1641 SPL_LINUX_TRY_COMPILE_SYMBOL([
1642 #include <linux/fcntl.h>
1643 #include <linux/namei.h>
1645 user_path_dir(NULL, NULL);
1646 ], [user_path_at], [], [
1648 AC_DEFINE(HAVE_USER_PATH_DIR, 1, [user_path_dir() is available])
1655 dnl # Symbol available in RHEL kernels not in stock kernels.
1657 AC_DEFUN([SPL_AC_SET_FS_PWD],
1658 [AC_MSG_CHECKING([whether set_fs_pwd() is available])
1659 SPL_LINUX_TRY_COMPILE_SYMBOL([
1660 #include <linux/spinlock.h>
1661 #include <linux/fs_struct.h>
1664 ], [set_fs_pwd], [], [
1666 AC_DEFINE(HAVE_SET_FS_PWD, 1, [set_fs_pwd() is available])
1673 dnl # 2.6.25 API change,
1674 dnl # Simplied API by replacing mnt+dentry args with a single path arg.
1676 AC_DEFUN([SPL_AC_2ARGS_SET_FS_PWD],
1677 [AC_MSG_CHECKING([whether set_fs_pwd() wants 2 args])
1678 SPL_LINUX_TRY_COMPILE([
1679 #include <linux/sched.h>
1680 #include <linux/fs_struct.h>
1682 set_fs_pwd(NULL, NULL);
1685 AC_DEFINE(HAVE_2ARGS_SET_FS_PWD, 1,
1686 [set_fs_pwd() wants 2 args])
1693 dnl # SLES API change, never adopted in mainline,
1694 dnl # Third 'struct vfsmount *' argument removed.
1696 AC_DEFUN([SPL_AC_2ARGS_VFS_UNLINK],
1697 [AC_MSG_CHECKING([whether vfs_unlink() wants 2 args])
1698 SPL_LINUX_TRY_COMPILE([
1699 #include <linux/fs.h>
1701 vfs_unlink(NULL, NULL);
1704 AC_DEFINE(HAVE_2ARGS_VFS_UNLINK, 1,
1705 [vfs_unlink() wants 2 args])
1712 dnl # SLES API change, never adopted in mainline,
1713 dnl # Third and sixth 'struct vfsmount *' argument removed.
1715 AC_DEFUN([SPL_AC_4ARGS_VFS_RENAME],
1716 [AC_MSG_CHECKING([whether vfs_rename() wants 4 args])
1717 SPL_LINUX_TRY_COMPILE([
1718 #include <linux/fs.h>
1720 vfs_rename(NULL, NULL, NULL, NULL);
1723 AC_DEFINE(HAVE_4ARGS_VFS_RENAME, 1,
1724 [vfs_rename() wants 4 args])
1731 dnl # 2.6.36 API change,
1732 dnl # The 'struct fs_struct->lock' was changed from a rwlock_t to
1733 dnl # a spinlock_t to improve the fastpath performance.
1735 AC_DEFUN([SPL_AC_FS_STRUCT_SPINLOCK], [
1736 AC_MSG_CHECKING([whether struct fs_struct uses spinlock_t])
1737 tmp_flags="$EXTRA_KCFLAGS"
1738 EXTRA_KCFLAGS="-Werror"
1739 SPL_LINUX_TRY_COMPILE([
1740 #include <linux/sched.h>
1741 #include <linux/fs_struct.h>
1743 struct fs_struct fs;
1744 spin_lock_init(&fs.lock);
1747 AC_DEFINE(HAVE_FS_STRUCT_SPINLOCK, 1,
1748 [struct fs_struct uses spinlock_t])
1752 EXTRA_KCFLAGS="$tmp_flags"
1756 dnl # 2.6.29 API change,
1757 dnl # check whether 'struct cred' exists
1759 AC_DEFUN([SPL_AC_CRED_STRUCT], [
1760 AC_MSG_CHECKING([whether struct cred exists])
1761 SPL_LINUX_TRY_COMPILE([
1762 #include <linux/cred.h>
1764 struct cred *cr __attribute__ ((unused));
1768 AC_DEFINE(HAVE_CRED_STRUCT, 1, [struct cred exists])
1775 dnl # Custom SPL patch may export this symbol.
1777 AC_DEFUN([SPL_AC_GROUPS_SEARCH],
1778 [AC_MSG_CHECKING([whether groups_search() is available])
1779 SPL_LINUX_TRY_COMPILE_SYMBOL([
1780 #include <linux/cred.h>
1782 groups_search(NULL, 0);
1783 ], [groups_search], [], [
1785 AC_DEFINE(HAVE_GROUPS_SEARCH, 1, [groups_search() is available])
1792 dnl # 2.6.x API change,
1793 dnl # __put_task_struct() was exported in RHEL5 but unavailable elsewhere.
1795 AC_DEFUN([SPL_AC_PUT_TASK_STRUCT],
1796 [AC_MSG_CHECKING([whether __put_task_struct() is available])
1797 SPL_LINUX_TRY_COMPILE_SYMBOL([
1798 #include <linux/sched.h>
1800 __put_task_struct(NULL);
1801 ], [__put_task_struct], [], [
1803 AC_DEFINE(HAVE_PUT_TASK_STRUCT, 1,
1804 [__put_task_struct() is available])
1811 dnl # 2.6.32 API change,
1812 dnl # Unused 'struct file *' removed from prototype.
1814 AC_DEFUN([SPL_AC_5ARGS_PROC_HANDLER], [
1815 AC_MSG_CHECKING([whether proc_handler() wants 5 args])
1816 SPL_LINUX_TRY_COMPILE([
1817 #include <linux/sysctl.h>
1819 proc_dostring(NULL, 0, NULL, NULL, NULL);
1822 AC_DEFINE(HAVE_5ARGS_PROC_HANDLER, 1,
1823 [proc_handler() wants 5 args])
1830 dnl # 2.6.x API change,
1831 dnl # kvasprintf() function added.
1833 AC_DEFUN([SPL_AC_KVASPRINTF],
1834 [AC_MSG_CHECKING([whether kvasprintf() is available])
1835 SPL_LINUX_TRY_COMPILE_SYMBOL([
1836 #include <linux/kernel.h>
1838 kvasprintf(0, NULL, *((va_list*)NULL));
1839 ], [kvasprintf], [], [
1841 AC_DEFINE(HAVE_KVASPRINTF, 1, [kvasprintf() is available])
1848 dnl # 2.6.29 API change,
1849 dnl # vfs_fsync() funcation added, prior to this use file_fsync().
1851 AC_DEFUN([SPL_AC_VFS_FSYNC],
1852 [AC_MSG_CHECKING([whether vfs_fsync() is available])
1853 SPL_LINUX_TRY_COMPILE_SYMBOL([
1854 #include <linux/fs.h>
1857 ], [vfs_fsync], [fs/sync.c], [
1859 AC_DEFINE(HAVE_VFS_FSYNC, 1, [vfs_fsync() is available])
1866 dnl # 2.6.35 API change,
1867 dnl # Unused 'struct dentry *' removed from vfs_fsync() prototype.
1869 AC_DEFUN([SPL_AC_2ARGS_VFS_FSYNC], [
1870 AC_MSG_CHECKING([whether vfs_fsync() wants 2 args])
1871 SPL_LINUX_TRY_COMPILE([
1872 #include <linux/fs.h>
1877 AC_DEFINE(HAVE_2ARGS_VFS_FSYNC, 1, [vfs_fsync() wants 2 args])
1884 dnl # 3.5 API change,
1885 dnl # inode_operations.truncate_range removed
1887 AC_DEFUN([SPL_AC_INODE_TRUNCATE_RANGE], [
1888 AC_MSG_CHECKING([whether truncate_range() inode operation is available])
1889 SPL_LINUX_TRY_COMPILE([
1890 #include <linux/fs.h>
1892 struct inode_operations ops;
1893 ops.truncate_range = NULL;
1896 AC_DEFINE(HAVE_INODE_TRUNCATE_RANGE, 1,
1897 [truncate_range() inode operation is available])
1904 dnl # Linux 2.6.38 - 3.x API
1906 AC_DEFUN([SPL_AC_KERNEL_FILE_FALLOCATE], [
1907 AC_MSG_CHECKING([whether fops->fallocate() exists])
1908 SPL_LINUX_TRY_COMPILE([
1909 #include <linux/fs.h>
1911 long (*fallocate) (struct file *, int, loff_t, loff_t) = NULL;
1912 struct file_operations fops __attribute__ ((unused)) = {
1913 .fallocate = fallocate,
1917 AC_DEFINE(HAVE_FILE_FALLOCATE, 1, [fops->fallocate() exists])
1924 dnl # Linux 2.6.x - 2.6.37 API
1926 AC_DEFUN([SPL_AC_KERNEL_INODE_FALLOCATE], [
1927 AC_MSG_CHECKING([whether iops->fallocate() exists])
1928 SPL_LINUX_TRY_COMPILE([
1929 #include <linux/fs.h>
1931 long (*fallocate) (struct inode *, int, loff_t, loff_t) = NULL;
1932 struct inode_operations fops __attribute__ ((unused)) = {
1933 .fallocate = fallocate,
1937 AC_DEFINE(HAVE_INODE_FALLOCATE, 1, [fops->fallocate() exists])
1944 dnl # PaX Linux 2.6.38 - 3.x API
1946 AC_DEFUN([SPL_AC_PAX_KERNEL_FILE_FALLOCATE], [
1947 AC_MSG_CHECKING([whether fops->fallocate() exists])
1948 SPL_LINUX_TRY_COMPILE([
1949 #include <linux/fs.h>
1951 long (*fallocate) (struct file *, int, loff_t, loff_t) = NULL;
1952 struct file_operations_no_const fops __attribute__ ((unused)) = {
1953 .fallocate = fallocate,
1957 AC_DEFINE(HAVE_FILE_FALLOCATE, 1, [fops->fallocate() exists])
1964 dnl # The fallocate callback was moved from the inode_operations
1965 dnl # structure to the file_operations structure.
1967 AC_DEFUN([SPL_AC_KERNEL_FALLOCATE], [
1968 SPL_AC_KERNEL_FILE_FALLOCATE
1969 SPL_AC_KERNEL_INODE_FALLOCATE
1970 SPL_AC_PAX_KERNEL_FILE_FALLOCATE
1974 dnl # 2.6.33 API change. Also backported in RHEL5 as of 2.6.18-190.el5.
1975 dnl # Earlier versions of rwsem_is_locked() were inline and had a race
1976 dnl # condition. The fixed version is exported as a symbol. The race
1977 dnl # condition is fixed by acquiring sem->wait_lock, so we must not
1978 dnl # call that version while holding sem->wait_lock.
1980 AC_DEFUN([SPL_AC_EXPORTED_RWSEM_IS_LOCKED],
1981 [AC_MSG_CHECKING([whether rwsem_is_locked() acquires sem->wait_lock])
1982 SPL_LINUX_TRY_COMPILE_SYMBOL([
1983 #include <linux/rwsem.h>
1984 int rwsem_is_locked(struct rw_semaphore *sem) { return 0; }
1985 ], [], [rwsem_is_locked], [lib/rwsem-spinlock.c], [
1987 AC_DEFINE(RWSEM_IS_LOCKED_TAKES_WAIT_LOCK, 1,
1988 [rwsem_is_locked() acquires sem->wait_lock])
1995 dnl # 2.6.xx API compat,
1996 dnl # There currently exists no exposed API to partially shrink the dcache.
1997 dnl # The expected mechanism to shrink the cache is a registered shrinker
1998 dnl # which is called during memory pressure.
2000 AC_DEFUN([SPL_AC_SHRINK_DCACHE_MEMORY],
2001 [AC_MSG_CHECKING([whether shrink_dcache_memory() is available])
2002 SPL_LINUX_TRY_COMPILE_SYMBOL([
2003 #include <linux/dcache.h>
2005 shrink_dcache_memory(0, 0);
2006 ], [shrink_dcache_memory], [fs/dcache.c], [
2008 AC_DEFINE(HAVE_SHRINK_DCACHE_MEMORY, 1,
2009 [shrink_dcache_memory() is available])
2016 dnl # 2.6.xx API compat,
2017 dnl # There currently exists no exposed API to partially shrink the icache.
2018 dnl # The expected mechanism to shrink the cache is a registered shrinker
2019 dnl # which is called during memory pressure.
2021 AC_DEFUN([SPL_AC_SHRINK_ICACHE_MEMORY],
2022 [AC_MSG_CHECKING([whether shrink_icache_memory() is available])
2023 SPL_LINUX_TRY_COMPILE_SYMBOL([
2024 #include <linux/dcache.h>
2026 shrink_icache_memory(0, 0);
2027 ], [shrink_icache_memory], [fs/inode.c], [
2029 AC_DEFINE(HAVE_SHRINK_ICACHE_MEMORY, 1,
2030 [shrink_icache_memory() is available])
2037 dnl # 2.6.39 API compat,
2038 dnl # The path_lookup() function has been renamed to kern_path_parent()
2039 dnl # and the flags argument has been removed. The only behavior now
2040 dnl # offered is that of LOOKUP_PARENT. The spl already always passed
2041 dnl # this flag so dropping the flag does not impact us.
2043 AC_DEFUN([SPL_AC_KERN_PATH_PARENT_HEADER], [
2044 SPL_CHECK_SYMBOL_HEADER(
2046 [int kern_path_parent(const char \*, struct nameidata \*)],
2047 [include/linux/namei.h],
2048 [AC_DEFINE(HAVE_KERN_PATH_PARENT_HEADER, 1,
2049 [kern_path_parent() is available])],
2054 dnl # 3.1 API compat,
2055 dnl # The kern_path_parent() symbol is no longer exported by the kernel.
2056 dnl # However, it remains the prefered interface and since we still have
2057 dnl # access to the prototype we dynamically lookup the required address.
2059 AC_DEFUN([SPL_AC_KERN_PATH_PARENT_SYMBOL],
2060 [AC_MSG_CHECKING([whether kern_path_parent() is available])
2061 SPL_LINUX_TRY_COMPILE_SYMBOL([
2062 #include <linux/namei.h>
2064 kern_path_parent(NULL, NULL);
2065 ], [kern_path_parent], [fs/namei.c], [
2067 AC_DEFINE(HAVE_KERN_PATH_PARENT_SYMBOL, 1,
2068 [kern_path_parent() is available])
2075 dnl # 3.6 API compat,
2076 dnl # The kern_path_parent() function was replaced by the kern_path_locked()
2077 dnl # function to eliminate all struct nameidata usage outside fs/namei.c.
2079 AC_DEFUN([SPL_AC_KERN_PATH_LOCKED], [
2080 SPL_CHECK_SYMBOL_HEADER(
2082 [struct dentry \*kern_path_locked(const char \*, struct path \*)],
2083 [include/linux/namei.h],
2084 [AC_DEFINE(HAVE_KERN_PATH_LOCKED, 1,
2085 [kern_path_locked() is available])],
2090 dnl # /proc/kallsyms support,
2091 dnl # Verify the kernel has CONFIG_KALLSYMS support enabled.
2093 AC_DEFUN([SPL_AC_CONFIG_KALLSYMS], [
2094 AC_MSG_CHECKING([whether CONFIG_KALLSYMS is defined])
2095 SPL_LINUX_TRY_COMPILE([
2096 #if !defined(CONFIG_KALLSYMS)
2097 #error CONFIG_KALLSYMS not defined
2100 AC_MSG_RESULT([yes])
2104 *** This kernel does not include the required kallsyms support.
2105 *** Rebuild the kernel with CONFIG_KALLSYMS=y set.])
2110 dnl # zlib inflate compat,
2111 dnl # Verify the kernel has CONFIG_ZLIB_INFLATE support enabled.
2113 AC_DEFUN([SPL_AC_CONFIG_ZLIB_INFLATE], [
2114 AC_MSG_CHECKING([whether CONFIG_ZLIB_INFLATE is defined])
2115 SPL_LINUX_TRY_COMPILE([
2116 #if !defined(CONFIG_ZLIB_INFLATE) && \
2117 !defined(CONFIG_ZLIB_INFLATE_MODULE)
2118 #error CONFIG_ZLIB_INFLATE not defined
2121 AC_MSG_RESULT([yes])
2125 *** This kernel does not include the required zlib inflate support.
2126 *** Rebuild the kernel with CONFIG_ZLIB_INFLATE=y|m set.])
2131 dnl # zlib deflate compat,
2132 dnl # Verify the kernel has CONFIG_ZLIB_DEFLATE support enabled.
2134 AC_DEFUN([SPL_AC_CONFIG_ZLIB_DEFLATE], [
2135 AC_MSG_CHECKING([whether CONFIG_ZLIB_DEFLATE is defined])
2136 SPL_LINUX_TRY_COMPILE([
2137 #if !defined(CONFIG_ZLIB_DEFLATE) && \
2138 !defined(CONFIG_ZLIB_DEFLATE_MODULE)
2139 #error CONFIG_ZLIB_DEFLATE not defined
2142 AC_MSG_RESULT([yes])
2146 *** This kernel does not include the required zlib deflate support.
2147 *** Rebuild the kernel with CONFIG_ZLIB_DEFLATE=y|m set.])
2152 dnl # 2.6.39 API compat,
2153 dnl # The function zlib_deflate_workspacesize() now take 2 arguments.
2154 dnl # This was done to avoid always having to allocate the maximum size
2155 dnl # workspace (268K). The caller can now specific the windowBits and
2156 dnl # memLevel compression parameters to get a smaller workspace.
2158 AC_DEFUN([SPL_AC_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE],
2159 [AC_MSG_CHECKING([whether zlib_deflate_workspacesize() wants 2 args])
2160 SPL_LINUX_TRY_COMPILE([
2161 #include <linux/zlib.h>
2163 return zlib_deflate_workspacesize(MAX_WBITS, MAX_MEM_LEVEL);
2166 AC_DEFINE(HAVE_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE, 1,
2167 [zlib_deflate_workspacesize() wants 2 args])
2174 dnl # 2.6.39 API change,
2175 dnl # Shrinker adjust to use common shrink_control structure.
2177 AC_DEFUN([SPL_AC_SHRINK_CONTROL_STRUCT], [
2178 AC_MSG_CHECKING([whether struct shrink_control exists])
2179 SPL_LINUX_TRY_COMPILE([
2180 #include <linux/mm.h>
2182 struct shrink_control sc __attribute__ ((unused));
2185 sc.gfp_mask = GFP_KERNEL;
2188 AC_DEFINE(HAVE_SHRINK_CONTROL_STRUCT, 1,
2189 [struct shrink_control exists])
2196 dnl # 3.1 API Change
2198 dnl # The rw_semaphore.wait_lock member was changed from spinlock_t to
2199 dnl # raw_spinlock_t at commit ddb6c9b58a19edcfac93ac670b066c836ff729f1.
2201 AC_DEFUN([SPL_AC_RWSEM_SPINLOCK_IS_RAW], [
2202 AC_MSG_CHECKING([whether struct rw_semaphore member wait_lock is raw])
2203 tmp_flags="$EXTRA_KCFLAGS"
2204 EXTRA_KCFLAGS="-Werror"
2205 SPL_LINUX_TRY_COMPILE([
2206 #include <linux/rwsem.h>
2208 struct rw_semaphore dummy_semaphore __attribute__ ((unused));
2209 raw_spinlock_t dummy_lock __attribute__ ((unused));
2210 dummy_semaphore.wait_lock = dummy_lock;
2213 AC_DEFINE(RWSEM_SPINLOCK_IS_RAW, 1,
2214 [struct rw_semaphore member wait_lock is raw_spinlock_t])
2218 EXTRA_KCFLAGS="$tmp_flags"