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="$KERNELCPPFLAGS -Wstrict-prototypes"
18 AC_SUBST(KERNELCPPFLAGS)
23 SPL_AC_DEBUG_KMEM_TRACKING
25 SPL_AC_ATOMIC_SPINLOCK
26 SPL_AC_TYPE_ATOMIC64_CMPXCHG
27 SPL_AC_TYPE_ATOMIC64_XCHG
29 SPL_AC_2ARGS_REGISTER_SYSCTL
31 SPL_AC_3ARGS_SHRINKER_CALLBACK
32 SPL_AC_PATH_IN_NAMEIDATA
38 SPL_AC_5ARGS_DEVICE_CREATE
39 SPL_AC_CLASS_DEVICE_CREATE
40 SPL_AC_SET_NORMALIZED_TIMESPEC_EXPORT
41 SPL_AC_SET_NORMALIZED_TIMESPEC_INLINE
46 SPL_AC_MONOTONIC_CLOCK
49 SPL_AC_MUTEX_OWNER_TASK_STRUCT
50 SPL_AC_MUTEX_LOCK_NESTED
51 SPL_AC_3ARGS_ON_EACH_CPU
52 SPL_AC_KALLSYMS_LOOKUP_NAME
53 SPL_AC_GET_VMALLOC_INFO
55 SPL_AC_FIRST_ONLINE_PGDAT
56 SPL_AC_NEXT_ONLINE_PGDAT
59 SPL_AC_GLOBAL_PAGE_STATE
60 SPL_AC_ZONE_STAT_ITEM_FREE
61 SPL_AC_ZONE_STAT_ITEM_INACTIVE
62 SPL_AC_ZONE_STAT_ITEM_ACTIVE
63 SPL_AC_GET_ZONE_COUNTS
66 SPL_AC_2ARGS_SET_FS_PWD
67 SPL_AC_SET_FS_PWD_WITH_CONST
68 SPL_AC_2ARGS_VFS_UNLINK
69 SPL_AC_4ARGS_VFS_RENAME
71 SPL_AC_2ARGS_VFS_FSYNC
72 SPL_AC_INODE_TRUNCATE_RANGE
73 SPL_AC_FS_STRUCT_SPINLOCK
76 SPL_AC_PUT_TASK_STRUCT
77 SPL_AC_5ARGS_PROC_HANDLER
79 SPL_AC_EXPORTED_RWSEM_IS_LOCKED
80 SPL_AC_KERNEL_FALLOCATE
81 SPL_AC_SHRINK_DCACHE_MEMORY
82 SPL_AC_SHRINK_ICACHE_MEMORY
83 SPL_AC_KERN_PATH_PARENT_HEADER
84 SPL_AC_KERN_PATH_PARENT_SYMBOL
85 SPL_AC_KERN_PATH_LOCKED
86 SPL_AC_CONFIG_KALLSYMS
87 SPL_AC_CONFIG_ZLIB_INFLATE
88 SPL_AC_CONFIG_ZLIB_DEFLATE
89 SPL_AC_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE
90 SPL_AC_SHRINK_CONTROL_STRUCT
91 SPL_AC_RWSEM_SPINLOCK_IS_RAW
92 SPL_AC_SCHED_RT_HEADER
93 SPL_AC_2ARGS_VFS_GETATTR
96 AC_DEFUN([SPL_AC_MODULE_SYMVERS], [
97 modpost=$LINUX/scripts/Makefile.modpost
98 AC_MSG_CHECKING([kernel file name for module symbols])
99 if test "x$enable_linux_builtin" != xyes -a -f "$modpost"; then
100 if grep -q Modules.symvers $modpost; then
101 LINUX_SYMBOLS=Modules.symvers
103 LINUX_SYMBOLS=Module.symvers
106 if ! test -f "$LINUX_OBJ/$LINUX_SYMBOLS"; then
108 *** Please make sure the kernel devel package for your distribution
109 *** is installed. If your building with a custom kernel make sure the
110 *** kernel is configured, built, and the '--with-linux=PATH' configure
111 *** option refers to the location of the kernel source.])
116 AC_MSG_RESULT($LINUX_SYMBOLS)
117 AC_SUBST(LINUX_SYMBOLS)
120 AC_DEFUN([SPL_AC_KERNEL], [
122 AS_HELP_STRING([--with-linux=PATH],
123 [Path to kernel source]),
124 [kernelsrc="$withval"])
126 AC_ARG_WITH([linux-obj],
127 AS_HELP_STRING([--with-linux-obj=PATH],
128 [Path to kernel build objects]),
129 [kernelbuild="$withval"])
131 AC_MSG_CHECKING([kernel source directory])
132 if test -z "$kernelsrc"; then
133 if test -e "/lib/modules/$(uname -r)/source"; then
134 headersdir="/lib/modules/$(uname -r)/source"
135 sourcelink=$(readlink -f "$headersdir")
136 elif test -e "/lib/modules/$(uname -r)/build"; then
137 headersdir="/lib/modules/$(uname -r)/build"
138 sourcelink=$(readlink -f "$headersdir")
140 sourcelink=$(ls -1d /usr/src/kernels/* \
142 2>/dev/null | grep -v obj | tail -1)
145 if test -n "$sourcelink" && test -e ${sourcelink}; then
146 kernelsrc=`readlink -f ${sourcelink}`
148 kernelsrc="[Not found]"
151 if test "$kernelsrc" = "NONE"; then
156 AC_MSG_RESULT([$kernelsrc])
157 if test ! -d "$kernelsrc"; then
159 *** Please make sure the kernel devel package for your distribution
160 *** is installed then try again. If that fails you can specify the
161 *** location of the kernel source with the '--with-linux=PATH' option.])
164 AC_MSG_CHECKING([kernel build directory])
165 if test -z "$kernelbuild"; then
166 if test -e "/lib/modules/$(uname -r)/build"; then
167 kernelbuild=`readlink -f /lib/modules/$(uname -r)/build`
168 elif test -d ${kernelsrc}-obj/${target_cpu}/${target_cpu}; then
169 kernelbuild=${kernelsrc}-obj/${target_cpu}/${target_cpu}
170 elif test -d ${kernelsrc}-obj/${target_cpu}/default; then
171 kernelbuild=${kernelsrc}-obj/${target_cpu}/default
172 elif test -d `dirname ${kernelsrc}`/build-${target_cpu}; then
173 kernelbuild=`dirname ${kernelsrc}`/build-${target_cpu}
175 kernelbuild=${kernelsrc}
178 AC_MSG_RESULT([$kernelbuild])
180 AC_MSG_CHECKING([kernel source version])
181 utsrelease1=$kernelbuild/include/linux/version.h
182 utsrelease2=$kernelbuild/include/linux/utsrelease.h
183 utsrelease3=$kernelbuild/include/generated/utsrelease.h
184 if test -r $utsrelease1 && fgrep -q UTS_RELEASE $utsrelease1; then
185 utsrelease=linux/version.h
186 elif test -r $utsrelease2 && fgrep -q UTS_RELEASE $utsrelease2; then
187 utsrelease=linux/utsrelease.h
188 elif test -r $utsrelease3 && fgrep -q UTS_RELEASE $utsrelease3; then
189 utsrelease=generated/utsrelease.h
192 if test "$utsrelease"; then
193 kernsrcver=`(echo "#include <$utsrelease>";
194 echo "kernsrcver=UTS_RELEASE") |
195 cpp -I $kernelbuild/include |
196 grep "^kernsrcver=" | cut -d \" -f 2`
198 if test -z "$kernsrcver"; then
199 AC_MSG_RESULT([Not found])
200 AC_MSG_ERROR([*** Cannot determine kernel version.])
203 AC_MSG_RESULT([Not found])
204 if test "x$enable_linux_builtin" != xyes; then
205 AC_MSG_ERROR([*** Cannot find UTS_RELEASE definition.])
208 *** Cannot find UTS_RELEASE definition.
209 *** Please run 'make prepare' inside the kernel source tree.])
213 AC_MSG_RESULT([$kernsrcver])
216 LINUX_OBJ=${kernelbuild}
217 LINUX_VERSION=${kernsrcver}
221 AC_SUBST(LINUX_VERSION)
223 SPL_AC_MODULE_SYMVERS
227 dnl # Default SPL user configuration
229 AC_DEFUN([SPL_AC_CONFIG_USER], [])
232 dnl # Check for rpm+rpmbuild to build RPM packages. If these tools
233 dnl # are missing it is non-fatal but you will not be able to build
234 dnl # RPM packages and will be warned if you try too.
236 AC_DEFUN([SPL_AC_RPM], [
240 AC_MSG_CHECKING([whether $RPM is available])
241 AS_IF([tmp=$($RPM --version 2>/dev/null)], [
242 RPM_VERSION=$(echo $tmp | $AWK '/RPM/ { print $[3] }')
244 AC_MSG_RESULT([$HAVE_RPM ($RPM_VERSION)])
247 AC_MSG_RESULT([$HAVE_RPM])
250 AC_MSG_CHECKING([whether $RPMBUILD is available])
251 AS_IF([tmp=$($RPMBUILD --version 2>/dev/null)], [
252 RPMBUILD_VERSION=$(echo $tmp | $AWK '/RPM/ { print $[3] }')
254 AC_MSG_RESULT([$HAVE_RPMBUILD ($RPMBUILD_VERSION)])
257 AC_MSG_RESULT([$HAVE_RPMBUILD])
262 AC_SUBST(RPM_VERSION)
264 AC_SUBST(HAVE_RPMBUILD)
266 AC_SUBST(RPMBUILD_VERSION)
270 dnl # Check for dpkg+dpkg-buildpackage to build DEB packages. If these
271 dnl # tools are missing it is non-fatal but you will not be able to build
272 dnl # DEB packages and will be warned if you try too.
274 AC_DEFUN([SPL_AC_DPKG], [
276 DPKGBUILD=dpkg-buildpackage
278 AC_MSG_CHECKING([whether $DPKG is available])
279 AS_IF([tmp=$($DPKG --version 2>/dev/null)], [
280 DPKG_VERSION=$(echo $tmp | $AWK '/Debian/ { print $[7] }')
282 AC_MSG_RESULT([$HAVE_DPKG ($DPKG_VERSION)])
285 AC_MSG_RESULT([$HAVE_DPKG])
288 AC_MSG_CHECKING([whether $DPKGBUILD is available])
289 AS_IF([tmp=$($DPKGBUILD --version 2>/dev/null)], [
290 DPKGBUILD_VERSION=$(echo $tmp | \
291 $AWK '/Debian/ { print $[4] }' | cut -f-4 -d'.')
293 AC_MSG_RESULT([$HAVE_DPKGBUILD ($DPKGBUILD_VERSION)])
296 AC_MSG_RESULT([$HAVE_DPKGBUILD])
301 AC_SUBST(DPKG_VERSION)
303 AC_SUBST(HAVE_DPKGBUILD)
305 AC_SUBST(DPKGBUILD_VERSION)
309 dnl # Until native packaging for various different packing systems
310 dnl # can be added the least we can do is attempt to use alien to
311 dnl # convert the RPM packages to the needed package type. This is
312 dnl # a hack but so far it has worked reasonable well.
314 AC_DEFUN([SPL_AC_ALIEN], [
317 AC_MSG_CHECKING([whether $ALIEN is available])
318 AS_IF([tmp=$($ALIEN --version 2>/dev/null)], [
319 ALIEN_VERSION=$(echo $tmp | $AWK '{ print $[3] }')
321 AC_MSG_RESULT([$HAVE_ALIEN ($ALIEN_VERSION)])
324 AC_MSG_RESULT([$HAVE_ALIEN])
329 AC_SUBST(ALIEN_VERSION)
333 dnl # Using the VENDOR tag from config.guess set the default
334 dnl # package type for 'make pkg': (rpm | deb | tgz)
336 AC_DEFUN([SPL_AC_DEFAULT_PACKAGE], [
337 AC_MSG_CHECKING([linux distribution])
338 if test -f /etc/toss-release ; then
340 elif test -f /etc/fedora-release ; then
342 elif test -f /etc/redhat-release ; then
344 elif test -f /etc/gentoo-release ; then
346 elif test -f /etc/arch-release ; then
348 elif test -f /etc/SuSE-release ; then
350 elif test -f /etc/slackware-version ; then
352 elif test -f /etc/lunar.release ; then
354 elif test -f /etc/lsb-release ; then
356 elif test -f /etc/debian_version ; then
361 AC_MSG_RESULT([$VENDOR])
364 AC_MSG_CHECKING([default package type])
366 toss) DEFAULT_PACKAGE=rpm ;;
367 redhat) DEFAULT_PACKAGE=rpm ;;
368 fedora) DEFAULT_PACKAGE=rpm ;;
369 gentoo) DEFAULT_PACKAGE=tgz ;;
370 arch) DEFAULT_PACKAGE=tgz ;;
371 sles) DEFAULT_PACKAGE=rpm ;;
372 slackware) DEFAULT_PACKAGE=tgz ;;
373 lunar) DEFAULT_PACKAGE=tgz ;;
374 ubuntu) DEFAULT_PACKAGE=deb ;;
375 debian) DEFAULT_PACKAGE=deb ;;
376 *) DEFAULT_PACKAGE=rpm ;;
379 AC_MSG_RESULT([$DEFAULT_PACKAGE])
380 AC_SUBST(DEFAULT_PACKAGE)
384 dnl # Default SPL user configuration
386 AC_DEFUN([SPL_AC_PACKAGE], [
387 SPL_AC_DEFAULT_PACKAGE
393 AC_DEFUN([SPL_AC_LICENSE], [
394 AC_MSG_CHECKING([spl license])
396 AC_MSG_RESULT([$LICENSE])
397 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DHAVE_GPL_ONLY_SYMBOLS"
401 AC_DEFUN([SPL_AC_CONFIG], [
403 AC_ARG_WITH([config],
404 AS_HELP_STRING([--with-config=CONFIG],
405 [Config file 'kernel|user|all|srpm']),
406 [SPL_CONFIG="$withval"])
407 AC_ARG_ENABLE([linux-builtin],
408 [AC_HELP_STRING([--enable-linux-builtin],
409 [Configure for builtin in-tree kernel modules @<:@default=no@:>@])],
411 [enable_linux_builtin=no])
413 AC_MSG_CHECKING([spl config])
414 AC_MSG_RESULT([$SPL_CONFIG]);
417 case "$SPL_CONFIG" in
418 kernel) SPL_AC_CONFIG_KERNEL ;;
419 user) SPL_AC_CONFIG_USER ;;
420 all) SPL_AC_CONFIG_KERNEL
421 SPL_AC_CONFIG_USER ;;
424 AC_MSG_RESULT([Error!])
425 AC_MSG_ERROR([Bad value "$SPL_CONFIG" for --with-config,
426 user kernel|user|all|srpm]) ;;
429 AM_CONDITIONAL([CONFIG_USER],
430 [test "$SPL_CONFIG" = user -o "$SPL_CONFIG" = all])
431 AM_CONDITIONAL([CONFIG_KERNEL],
432 [test "$SPL_CONFIG" = kernel -o "$SPL_CONFIG" = all] &&
433 [test "x$enable_linux_builtin" != xyes ])
437 dnl # Enable if the SPL should be compiled with internal debugging enabled.
438 dnl # By default this support is disabled.
440 AC_DEFUN([SPL_AC_DEBUG], [
441 AC_MSG_CHECKING([whether debugging is enabled])
442 AC_ARG_ENABLE([debug],
443 [AS_HELP_STRING([--enable-debug],
444 [Enable generic debug support @<:@default=no@:>@])],
448 AS_IF([test "x$enable_debug" = xyes],
450 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG -Werror"
451 DEBUG_CFLAGS="-DDEBUG -Werror"
452 DEBUG_SPL="_with_debug"
454 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DNDEBUG"
455 DEBUG_CFLAGS="-DNDEBUG"
456 DEBUG_SPL="_without_debug"
459 AC_SUBST(DEBUG_CFLAGS)
461 AC_MSG_RESULT([$enable_debug])
465 dnl # Enabled by default it provides a basic debug log infrastructure.
466 dnl # Each subsystem registers itself with a name and logs messages
467 dnl # using predefined types. If the debug mask it set to allow the
468 dnl # message type it will be written to the internal log. The log
469 dnl # can be dumped to a file by echoing 1 to the 'dump' proc entry,
470 dnl # after dumping the log it must be decoded using the spl utility.
472 dnl # echo 1 >/proc/sys/kernel/spl/debug/dump
473 dnl # spl /tmp/spl-log.xxx.yyy /tmp/spl-log.xxx.yyy.txt
475 AC_DEFUN([SPL_AC_DEBUG_LOG], [
476 AC_ARG_ENABLE([debug-log],
477 [AS_HELP_STRING([--enable-debug-log],
478 [Enable basic debug logging @<:@default=yes@:>@])],
480 [enable_debug_log=yes])
482 AS_IF([test "x$enable_debug_log" = xyes],
484 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_LOG"
485 DEBUG_LOG="_with_debug_log"
486 AC_DEFINE([DEBUG_LOG], [1],
487 [Define to 1 to enable basic debug logging])
489 DEBUG_LOG="_without_debug_log"
493 AC_MSG_CHECKING([whether basic debug logging is enabled])
494 AC_MSG_RESULT([$enable_debug_log])
498 dnl # Enabled by default it provides a minimal level of memory tracking.
499 dnl # A total count of bytes allocated is kept for each alloc and free.
500 dnl # Then at module unload time a report to the console will be printed
501 dnl # if memory was leaked. Additionally, /proc/spl/kmem/slab will exist
502 dnl # and provide an easy way to inspect the kmem based slab.
504 AC_DEFUN([SPL_AC_DEBUG_KMEM], [
505 AC_ARG_ENABLE([debug-kmem],
506 [AS_HELP_STRING([--enable-debug-kmem],
507 [Enable basic kmem accounting @<:@default=yes@:>@])],
509 [enable_debug_kmem=yes])
511 AS_IF([test "x$enable_debug_kmem" = xyes],
513 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_KMEM"
514 DEBUG_KMEM="_with_debug_kmem"
515 AC_DEFINE([DEBUG_KMEM], [1],
516 [Define to 1 to enable basic kmem accounting])
518 DEBUG_KMEM="_without_debug_kmem"
522 AC_MSG_CHECKING([whether basic kmem accounting is enabled])
523 AC_MSG_RESULT([$enable_debug_kmem])
527 dnl # Disabled by default it provides detailed memory tracking. This
528 dnl # feature also requires --enable-debug-kmem to be set. When enabled
529 dnl # not only will total bytes be tracked but also the location of every
530 dnl # alloc and free. When the SPL module is unloaded a list of all leaked
531 dnl # addresses and where they were allocated will be dumped to the console.
532 dnl # Enabling this feature has a significant impact on performance but it
533 dnl # makes finding memory leaks pretty straight forward.
535 AC_DEFUN([SPL_AC_DEBUG_KMEM_TRACKING], [
536 AC_ARG_ENABLE([debug-kmem-tracking],
537 [AS_HELP_STRING([--enable-debug-kmem-tracking],
538 [Enable detailed kmem tracking @<:@default=no@:>@])],
540 [enable_debug_kmem_tracking=no])
542 AS_IF([test "x$enable_debug_kmem_tracking" = xyes],
544 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_KMEM_TRACKING"
545 DEBUG_KMEM_TRACKING="_with_debug_kmem_tracking"
546 AC_DEFINE([DEBUG_KMEM_TRACKING], [1],
547 [Define to 1 to enable detailed kmem tracking])
549 DEBUG_KMEM_TRACKING="_without_debug_kmem_tracking"
552 AC_SUBST(DEBUG_KMEM_TRACKING)
553 AC_MSG_CHECKING([whether detailed kmem tracking is enabled])
554 AC_MSG_RESULT([$enable_debug_kmem_tracking])
558 dnl # SPL_LINUX_CONFTEST
560 AC_DEFUN([SPL_LINUX_CONFTEST], [
561 cat confdefs.h - <<_ACEOF >conftest.c
567 dnl # SPL_LANG_PROGRAM(C)([PROLOGUE], [BODY])
569 m4_define([SPL_LANG_PROGRAM], [
574 dnl Do *not* indent the following line: there may be CPP directives.
575 dnl Don't move the `;' right after for the same reason.
583 dnl # SPL_LINUX_COMPILE_IFELSE / like AC_COMPILE_IFELSE
585 AC_DEFUN([SPL_LINUX_COMPILE_IFELSE], [
586 m4_ifvaln([$1], [SPL_LINUX_CONFTEST([$1])])
587 rm -Rf build && mkdir -p build && touch build/conftest.mod.c
588 echo "obj-m := conftest.o" >build/Makefile
590 test "x$enable_linux_builtin" = xyes && modpost_flag='modpost=true' # fake modpost stage
592 [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])],
594 [_AC_MSG_LOG_CONFTEST m4_ifvaln([$5],[$5])]
600 dnl # SPL_LINUX_TRY_COMPILE like AC_TRY_COMPILE
602 AC_DEFUN([SPL_LINUX_TRY_COMPILE],
603 [SPL_LINUX_COMPILE_IFELSE(
604 [AC_LANG_SOURCE([SPL_LANG_PROGRAM([[$1]], [[$2]])])],
606 [test -s build/conftest.o],
611 dnl # SPL_CHECK_SYMBOL_EXPORT
612 dnl # check symbol exported or not
614 AC_DEFUN([SPL_CHECK_SYMBOL_EXPORT], [
615 grep -q -E '[[[:space:]]]$1[[[:space:]]]' \
616 $LINUX_OBJ/Module*.symvers 2>/dev/null
618 if test $rc -ne 0; then
621 grep -q -E "EXPORT_SYMBOL.*($1)" \
622 "$LINUX_OBJ/$file" 2>/dev/null
624 if test $rc -eq 0; then
629 if test $export -eq 0; then :
640 dnl # SPL_LINUX_TRY_COMPILE_SYMBOL
641 dnl # like SPL_LINUX_TRY_COMPILE, except SPL_CHECK_SYMBOL_EXPORT
642 dnl # is called if not compiling for builtin
644 AC_DEFUN([SPL_LINUX_TRY_COMPILE_SYMBOL], [
645 SPL_LINUX_TRY_COMPILE([$1], [$2], [rc=0], [rc=1])
646 if test $rc -ne 0; then :
649 if test "x$enable_linux_builtin" != xyes; then
650 SPL_CHECK_SYMBOL_EXPORT([$3], [$4], [rc=0], [rc=1])
652 if test $rc -ne 0; then :
661 dnl # SPL_CHECK_SYMBOL_HEADER
662 dnl # check if a symbol prototype is defined in listed headers.
664 AC_DEFUN([SPL_CHECK_SYMBOL_HEADER], [
665 AC_MSG_CHECKING([whether symbol $1 exists in header])
668 grep -q "$2" "$LINUX/$file" 2>/dev/null
670 if test $rc -eq 0; then
675 if test $header -eq 0; then
685 dnl # SPL_CHECK_HEADER
686 dnl # check whether header exists and define HAVE_$2_HEADER
688 AC_DEFUN([SPL_CHECK_HEADER],
689 [AC_MSG_CHECKING([whether header $1 exists])
690 SPL_LINUX_TRY_COMPILE([
695 AC_DEFINE(HAVE_$2_HEADER, 1, [$1 exists])
705 dnl # Basic toolchain sanity check.
707 AC_DEFUN([SPL_AC_TEST_MODULE],
708 [AC_MSG_CHECKING([whether modules can be built])
709 SPL_LINUX_TRY_COMPILE([],[],[
713 if test "x$enable_linux_builtin" != xyes; then
714 AC_MSG_ERROR([*** Unable to build an empty module.])
717 *** Unable to build an empty module.
718 *** Please run 'make scripts' inside the kernel source tree.])
724 dnl # Use the atomic implemenation based on global spinlocks. This
725 dnl # should only be needed by 32-bit kernels which do not provide
726 dnl # the atomic64_* API. It may be optionally enabled as a fallback
727 dnl # if problems are observed with the direct mapping to the native
728 dnl # Linux atomic operations. You may not disable atomic spinlocks
729 dnl # if you kernel does not an atomic64_* API.
731 AC_DEFUN([SPL_AC_ATOMIC_SPINLOCK], [
732 AC_ARG_ENABLE([atomic-spinlocks],
733 [AS_HELP_STRING([--enable-atomic-spinlocks],
734 [Atomic types use spinlocks @<:@default=check@:>@])],
736 [enable_atomic_spinlocks=check])
738 SPL_LINUX_TRY_COMPILE([
739 #include <linux/fs.h>
741 atomic64_t *ptr __attribute__ ((unused));
744 AC_DEFINE(HAVE_ATOMIC64_T, 1,
745 [kernel defines atomic64_t])
750 AS_IF([test "x$enable_atomic_spinlocks" = xcheck], [
751 AS_IF([test "x$have_atomic64_t" = xyes], [
752 enable_atomic_spinlocks=no
754 enable_atomic_spinlocks=yes
758 AS_IF([test "x$enable_atomic_spinlocks" = xyes], [
759 AC_DEFINE([ATOMIC_SPINLOCK], [1],
760 [Atomic types use spinlocks])
762 AS_IF([test "x$have_atomic64_t" = xno], [
764 [--disable-atomic-spinlocks given but required atomic64 support is unavailable])
768 AC_MSG_CHECKING([whether atomic types use spinlocks])
769 AC_MSG_RESULT([$enable_atomic_spinlocks])
771 AC_MSG_CHECKING([whether kernel defines atomic64_t])
772 AC_MSG_RESULT([$have_atomic64_t])
776 dnl # 2.6.24 API change,
777 dnl # check if atomic64_cmpxchg is defined
779 AC_DEFUN([SPL_AC_TYPE_ATOMIC64_CMPXCHG],
780 [AC_MSG_CHECKING([whether kernel defines atomic64_cmpxchg])
781 SPL_LINUX_TRY_COMPILE([
782 #include <linux/fs.h>
784 atomic64_cmpxchg((atomic64_t *)NULL, 0, 0);
787 AC_DEFINE(HAVE_ATOMIC64_CMPXCHG, 1,
788 [kernel defines atomic64_cmpxchg])
795 dnl # 2.6.24 API change,
796 dnl # check if atomic64_xchg is defined
798 AC_DEFUN([SPL_AC_TYPE_ATOMIC64_XCHG],
799 [AC_MSG_CHECKING([whether kernel defines atomic64_xchg])
800 SPL_LINUX_TRY_COMPILE([
801 #include <linux/fs.h>
803 atomic64_xchg((atomic64_t *)NULL, 0);
806 AC_DEFINE(HAVE_ATOMIC64_XCHG, 1,
807 [kernel defines atomic64_xchg])
814 dnl # 2.6.24 API change,
815 dnl # check if uintptr_t typedef is defined
817 AC_DEFUN([SPL_AC_TYPE_UINTPTR_T],
818 [AC_MSG_CHECKING([whether kernel defines uintptr_t])
819 SPL_LINUX_TRY_COMPILE([
820 #include <linux/types.h>
822 uintptr_t *ptr __attribute__ ((unused));
825 AC_DEFINE(HAVE_UINTPTR_T, 1,
826 [kernel defines uintptr_t])
833 dnl # 2.6.21 API change,
834 dnl # 'register_sysctl_table' use only one argument instead of two
836 AC_DEFUN([SPL_AC_2ARGS_REGISTER_SYSCTL],
837 [AC_MSG_CHECKING([whether register_sysctl_table() wants 2 args])
838 SPL_LINUX_TRY_COMPILE([
839 #include <linux/sysctl.h>
841 (void) register_sysctl_table(NULL, 0);
844 AC_DEFINE(HAVE_2ARGS_REGISTER_SYSCTL, 1,
845 [register_sysctl_table() wants 2 args])
852 dnl # 2.6.23 API change
853 dnl # Old set_shrinker API replaced with register_shrinker
855 AC_DEFUN([SPL_AC_SET_SHRINKER], [
856 AC_MSG_CHECKING([whether set_shrinker() available])
857 SPL_LINUX_TRY_COMPILE([
858 #include <linux/mm.h>
860 return set_shrinker(DEFAULT_SEEKS, NULL);
863 AC_DEFINE(HAVE_SET_SHRINKER, 1,
864 [set_shrinker() available])
871 dnl # 2.6.35 API change,
872 dnl # Add context to shrinker callback
874 AC_DEFUN([SPL_AC_3ARGS_SHRINKER_CALLBACK],
875 [AC_MSG_CHECKING([whether shrinker callback wants 3 args])
876 tmp_flags="$EXTRA_KCFLAGS"
877 EXTRA_KCFLAGS="-Werror"
878 SPL_LINUX_TRY_COMPILE([
879 #include <linux/mm.h>
881 int shrinker_cb(struct shrinker *, int, unsigned int);
883 struct shrinker cache_shrinker = {
884 .shrink = shrinker_cb,
885 .seeks = DEFAULT_SEEKS,
887 register_shrinker(&cache_shrinker);
890 AC_DEFINE(HAVE_3ARGS_SHRINKER_CALLBACK, 1,
891 [shrinker callback wants 3 args])
895 EXTRA_KCFLAGS="$tmp_flags"
899 dnl # 2.6.25 API change,
900 dnl # struct path entry added to struct nameidata
902 AC_DEFUN([SPL_AC_PATH_IN_NAMEIDATA],
903 [AC_MSG_CHECKING([whether struct path used in struct nameidata])
904 SPL_LINUX_TRY_COMPILE([
905 #include <linux/namei.h>
907 struct nameidata nd __attribute__ ((unused));
910 nd.path.dentry = NULL;
913 AC_DEFINE(HAVE_PATH_IN_NAMEIDATA, 1,
914 [struct path used in struct nameidata])
921 dnl # Custom SPL patch may export this system it is not required
923 AC_DEFUN([SPL_AC_TASK_CURR],
924 [AC_MSG_CHECKING([whether task_curr() is available])
925 SPL_LINUX_TRY_COMPILE_SYMBOL([
926 #include <linux/sched.h>
929 ], [task_curr], [kernel/sched.c], [
931 AC_DEFINE(HAVE_TASK_CURR, 1, [task_curr() is available])
938 dnl # 2.6.19 API change,
939 dnl # Use CTL_UNNUMBERED when binary sysctl is not required
941 AC_DEFUN([SPL_AC_CTL_UNNUMBERED],
942 [AC_MSG_CHECKING([whether unnumbered sysctl support exists])
943 SPL_LINUX_TRY_COMPILE([
944 #include <linux/sysctl.h>
946 #ifndef CTL_UNNUMBERED
947 #error CTL_UNNUMBERED undefined
951 AC_DEFINE(HAVE_CTL_UNNUMBERED, 1,
952 [unnumbered sysctl support exists])
959 dnl # 2.6.33 API change,
960 dnl # Removed .ctl_name from struct ctl_table.
962 AC_DEFUN([SPL_AC_CTL_NAME], [
963 AC_MSG_CHECKING([whether struct ctl_table has ctl_name])
964 SPL_LINUX_TRY_COMPILE([
965 #include <linux/sysctl.h>
967 struct ctl_table ctl __attribute__ ((unused));
971 AC_DEFINE(HAVE_CTL_NAME, 1, [struct ctl_table has ctl_name])
978 dnl # 2.6.16 API change.
979 dnl # Check if 'fls64()' is available
981 AC_DEFUN([SPL_AC_FLS64],
982 [AC_MSG_CHECKING([whether fls64() is available])
983 SPL_LINUX_TRY_COMPILE([
984 #include <linux/bitops.h>
989 AC_DEFINE(HAVE_FLS64, 1, [fls64() is available])
996 dnl # 2.6.18 API change, check whether device_create() is available.
997 dnl # Device_create() was introduced in 2.6.18 and depricated
998 dnl # class_device_create() which was fully removed in 2.6.26.
1000 AC_DEFUN([SPL_AC_DEVICE_CREATE],
1001 [AC_MSG_CHECKING([whether device_create() is available])
1002 SPL_CHECK_SYMBOL_EXPORT([device_create], [drivers/base/core.c], [
1004 AC_DEFINE(HAVE_DEVICE_CREATE, 1,
1005 [device_create() is available])
1012 dnl # 2.6.27 API change,
1013 dnl # device_create() uses 5 args, new 'drvdata' argument.
1015 AC_DEFUN([SPL_AC_5ARGS_DEVICE_CREATE], [
1016 AC_MSG_CHECKING([whether device_create() wants 5 args])
1017 tmp_flags="$EXTRA_KCFLAGS"
1018 EXTRA_KCFLAGS="-Werror"
1019 SPL_LINUX_TRY_COMPILE([
1020 #include <linux/device.h>
1022 device_create(NULL, NULL, 0, NULL, "%d", 1);
1025 AC_DEFINE(HAVE_5ARGS_DEVICE_CREATE, 1,
1026 [device_create wants 5 args])
1030 EXTRA_KCFLAGS="$tmp_flags"
1034 dnl # 2.6.13 API change, check whether class_device_create() is available.
1035 dnl # Class_device_create() was introduced in 2.6.13 and depricated
1036 dnl # class_simple_device_add() which was fully removed in 2.6.13.
1038 AC_DEFUN([SPL_AC_CLASS_DEVICE_CREATE],
1039 [AC_MSG_CHECKING([whether class_device_create() is available])
1040 SPL_LINUX_TRY_COMPILE_SYMBOL([
1041 #include <linux/device.h>
1043 class_device_create(NULL, NULL, 0, NULL, NULL);
1044 ], [class_device_create], [drivers/base/class.c], [
1046 AC_DEFINE(HAVE_CLASS_DEVICE_CREATE, 1,
1047 [class_device_create() is available])
1054 dnl # 2.6.26 API change, set_normalized_timespec() is exported.
1056 AC_DEFUN([SPL_AC_SET_NORMALIZED_TIMESPEC_EXPORT],
1057 [AC_MSG_CHECKING([whether set_normalized_timespec() is available as export])
1058 SPL_LINUX_TRY_COMPILE_SYMBOL([
1059 #include <linux/time.h>
1061 set_normalized_timespec(NULL, 0, 0);
1062 ], [set_normalized_timespec], [kernel/time.c], [
1064 AC_DEFINE(HAVE_SET_NORMALIZED_TIMESPEC_EXPORT, 1,
1065 [set_normalized_timespec() is available as export])
1072 dnl # 2.6.16 API change, set_normalize_timespec() moved to time.c
1073 dnl # previously it was available in time.h as an inline.
1075 AC_DEFUN([SPL_AC_SET_NORMALIZED_TIMESPEC_INLINE], [
1076 AC_MSG_CHECKING([whether set_normalized_timespec() is an inline])
1077 SPL_LINUX_TRY_COMPILE([
1078 #include <linux/time.h>
1079 void set_normalized_timespec(struct timespec *ts,
1080 time_t sec, long nsec) { }
1087 AC_DEFINE(HAVE_SET_NORMALIZED_TIMESPEC_INLINE, 1,
1088 [set_normalized_timespec() is available as inline])
1093 dnl # 2.6.18 API change,
1094 dnl # timespec_sub() inline function available in linux/time.h
1096 AC_DEFUN([SPL_AC_TIMESPEC_SUB], [
1097 AC_MSG_CHECKING([whether timespec_sub() is available])
1098 SPL_LINUX_TRY_COMPILE([
1099 #include <linux/time.h>
1101 struct timespec a = { 0 };
1102 struct timespec b = { 0 };
1103 struct timespec c __attribute__ ((unused));
1104 c = timespec_sub(a, b);
1107 AC_DEFINE(HAVE_TIMESPEC_SUB, 1, [timespec_sub() is available])
1114 dnl # 2.6.19 API change,
1115 dnl # check if init_utsname() is available in linux/utsname.h
1117 AC_DEFUN([SPL_AC_INIT_UTSNAME], [
1118 AC_MSG_CHECKING([whether init_utsname() is available])
1119 SPL_LINUX_TRY_COMPILE([
1120 #include <linux/utsname.h>
1122 struct new_utsname *a __attribute__ ((unused));
1126 AC_DEFINE(HAVE_INIT_UTSNAME, 1, [init_utsname() is available])
1133 dnl # 2.6.18 API change,
1134 dnl # added linux/uaccess.h
1136 AC_DEFUN([SPL_AC_UACCESS_HEADER], [
1137 SPL_CHECK_HEADER([linux/uaccess.h], [UACCESS], [], [])
1141 dnl # 2.6.12 API change,
1142 dnl # check whether 'kmalloc_node()' is available.
1144 AC_DEFUN([SPL_AC_KMALLOC_NODE], [
1145 AC_MSG_CHECKING([whether kmalloc_node() is available])
1146 SPL_LINUX_TRY_COMPILE([
1147 #include <linux/slab.h>
1149 void *a __attribute__ ((unused));
1150 a = kmalloc_node(1, GFP_KERNEL, 0);
1153 AC_DEFINE(HAVE_KMALLOC_NODE, 1, [kmalloc_node() is available])
1160 dnl # 2.6.9 API change,
1161 dnl # check whether 'monotonic_clock()' is available it may
1162 dnl # be available for some archs but not others.
1164 AC_DEFUN([SPL_AC_MONOTONIC_CLOCK],
1165 [AC_MSG_CHECKING([whether monotonic_clock() is available])
1166 SPL_LINUX_TRY_COMPILE_SYMBOL([
1167 #include <linux/timex.h>
1170 ], [monotonic_clock], [], [
1172 AC_DEFINE(HAVE_MONOTONIC_CLOCK, 1,
1173 [monotonic_clock() is available])
1180 dnl # 2.6.16 API change,
1181 dnl # check whether 'struct inode' has i_mutex
1183 AC_DEFUN([SPL_AC_INODE_I_MUTEX], [
1184 AC_MSG_CHECKING([whether struct inode has i_mutex])
1185 SPL_LINUX_TRY_COMPILE([
1186 #include <linux/fs.h>
1187 #include <linux/mutex.h>
1190 mutex_init(&i.i_mutex);
1193 AC_DEFINE(HAVE_INODE_I_MUTEX, 1, [struct inode has i_mutex])
1200 dnl # 2.6.29 API change,
1201 dnl # Adaptive mutexs introduced.
1203 AC_DEFUN([SPL_AC_MUTEX_OWNER], [
1204 AC_MSG_CHECKING([whether struct mutex has owner])
1205 SPL_LINUX_TRY_COMPILE([
1206 #include <linux/mutex.h>
1208 struct mutex mtx __attribute__ ((unused));
1212 AC_DEFINE(HAVE_MUTEX_OWNER, 1, [struct mutex has owner])
1219 dnl # 2.6.39 API change,
1220 dnl # Owner type change. A Linux mutex prior to 2.6.39 would store
1221 dnl # the owner as a thread_info pointer when CONFIG_DEBUG_MUTEXES
1222 dnl # was defined. As of 2.6.39 this was changed to a task_struct
1223 dnl # pointer which frankly makes a lot more sense.
1225 AC_DEFUN([SPL_AC_MUTEX_OWNER_TASK_STRUCT], [
1226 AC_MSG_CHECKING([whether struct mutex owner is a task_struct])
1227 tmp_flags="$EXTRA_KCFLAGS"
1228 EXTRA_KCFLAGS="-Werror"
1229 SPL_LINUX_TRY_COMPILE([
1230 #include <linux/mutex.h>
1231 #include <linux/sched.h>
1233 struct mutex mtx __attribute__ ((unused));
1234 mtx.owner = current;
1237 AC_DEFINE(HAVE_MUTEX_OWNER_TASK_STRUCT, 1,
1238 [struct mutex owner is a task_struct])
1242 EXTRA_KCFLAGS="$tmp_flags"
1246 dnl # 2.6.18 API change,
1247 dnl # First introduced 'mutex_lock_nested()' in include/linux/mutex.h,
1248 dnl # as part of the mutex validator. Fallback to using 'mutex_lock()'
1249 dnl # if the mutex validator is disabled or otherwise unavailable.
1251 AC_DEFUN([SPL_AC_MUTEX_LOCK_NESTED], [
1252 AC_MSG_CHECKING([whether mutex_lock_nested() is available])
1253 SPL_LINUX_TRY_COMPILE([
1254 #include <linux/mutex.h>
1258 mutex_lock_nested(&mutex, 0);
1261 AC_DEFINE(HAVE_MUTEX_LOCK_NESTED, 1,
1262 [mutex_lock_nested() is available])
1269 dnl # 2.6.27 API change,
1270 dnl # on_each_cpu() uses 3 args, no 'retry' argument
1272 AC_DEFUN([SPL_AC_3ARGS_ON_EACH_CPU], [
1273 AC_MSG_CHECKING([whether on_each_cpu() wants 3 args])
1274 SPL_LINUX_TRY_COMPILE([
1275 #include <linux/interrupt.h>
1276 #include <linux/smp.h>
1278 void on_each_cpu_func(void *data) { return; }
1280 on_each_cpu(on_each_cpu_func, NULL, 0);
1283 AC_DEFINE(HAVE_3ARGS_ON_EACH_CPU, 1,
1284 [on_each_cpu wants 3 args])
1291 dnl # 2.6.18 API change,
1292 dnl # kallsyms_lookup_name no longer exported
1294 AC_DEFUN([SPL_AC_KALLSYMS_LOOKUP_NAME],
1295 [AC_MSG_CHECKING([whether kallsyms_lookup_name() is available])
1296 SPL_LINUX_TRY_COMPILE_SYMBOL([
1297 #include <linux/kallsyms.h>
1299 kallsyms_lookup_name(NULL);
1300 ], [kallsyms_lookup_name], [], [
1302 AC_DEFINE(HAVE_KALLSYMS_LOOKUP_NAME, 1,
1303 [kallsyms_lookup_name() is available])
1310 dnl # Proposed API change,
1311 dnl # This symbol is not available in stock kernels. You may build a
1312 dnl # custom kernel with the *-spl-export-symbols.patch which will export
1313 dnl # these symbols for use. If your already rolling a custom kernel for
1314 dnl # your environment this is recommended.
1316 AC_DEFUN([SPL_AC_GET_VMALLOC_INFO],
1317 [AC_MSG_CHECKING([whether get_vmalloc_info() is available])
1318 SPL_CHECK_SYMBOL_EXPORT([get_vmalloc_info], [], [
1320 AC_DEFINE(HAVE_GET_VMALLOC_INFO, 1,
1321 [get_vmalloc_info() is available])
1328 dnl # 2.6.17 API change
1329 dnl # The helper functions first_online_pgdat(), next_online_pgdat(), and
1330 dnl # next_zone() are introduced to simplify for_each_zone(). These symbols
1331 dnl # were exported in 2.6.17 for use by modules which was consistent with
1332 dnl # the previous implementation of for_each_zone(). From 2.6.18 - 2.6.19
1333 dnl # the symbols were exported as 'unused', and by 2.6.20 they exports
1334 dnl # were dropped entirely leaving modules no way to directly iterate over
1335 dnl # the zone list. Because we need access to the zone helpers we check
1336 dnl # if the kernel contains the old or new implementation. Then we check
1337 dnl # to see if the symbols we need for each version are available. If they
1338 dnl # are not, dynamically aquire the addresses with kallsyms_lookup_name().
1340 AC_DEFUN([SPL_AC_PGDAT_HELPERS], [
1341 AC_MSG_CHECKING([whether symbol *_pgdat exist])
1342 grep -q -E 'first_online_pgdat' $LINUX/include/linux/mmzone.h 2>/dev/null
1344 if test $rc -eq 0; then
1345 AC_MSG_RESULT([yes])
1346 AC_DEFINE(HAVE_PGDAT_HELPERS, 1, [pgdat helpers are available])
1353 dnl # Proposed API change,
1354 dnl # This symbol is not available in stock kernels. You may build a
1355 dnl # custom kernel with the *-spl-export-symbols.patch which will export
1356 dnl # these symbols for use. If your already rolling a custom kernel for
1357 dnl # your environment this is recommended.
1359 AC_DEFUN([SPL_AC_FIRST_ONLINE_PGDAT],
1360 [AC_MSG_CHECKING([whether first_online_pgdat() is available])
1361 SPL_LINUX_TRY_COMPILE_SYMBOL([
1362 #include <linux/mmzone.h>
1364 first_online_pgdat();
1365 ], [first_online_pgdat], [], [
1367 AC_DEFINE(HAVE_FIRST_ONLINE_PGDAT, 1,
1368 [first_online_pgdat() is available])
1375 dnl # Proposed API change,
1376 dnl # This symbol is not available in stock kernels. You may build a
1377 dnl # custom kernel with the *-spl-export-symbols.patch which will export
1378 dnl # these symbols for use. If your already rolling a custom kernel for
1379 dnl # your environment this is recommended.
1381 AC_DEFUN([SPL_AC_NEXT_ONLINE_PGDAT],
1382 [AC_MSG_CHECKING([whether next_online_pgdat() is available])
1383 SPL_LINUX_TRY_COMPILE_SYMBOL([
1384 #include <linux/mmzone.h>
1386 next_online_pgdat(NULL);
1387 ], [next_online_pgdat], [], [
1389 AC_DEFINE(HAVE_NEXT_ONLINE_PGDAT, 1,
1390 [next_online_pgdat() is available])
1397 dnl # Proposed API change,
1398 dnl # This symbol is not available in stock kernels. You may build a
1399 dnl # custom kernel with the *-spl-export-symbols.patch which will export
1400 dnl # these symbols for use. If your already rolling a custom kernel for
1401 dnl # your environment this is recommended.
1403 AC_DEFUN([SPL_AC_NEXT_ZONE],
1404 [AC_MSG_CHECKING([whether next_zone() is available])
1405 SPL_LINUX_TRY_COMPILE_SYMBOL([
1406 #include <linux/mmzone.h>
1409 ], [next_zone], [], [
1411 AC_DEFINE(HAVE_NEXT_ZONE, 1, [next_zone() is available])
1418 dnl # 2.6.17 API change,
1419 dnl # See SPL_AC_PGDAT_HELPERS for details.
1421 AC_DEFUN([SPL_AC_PGDAT_LIST],
1422 [AC_MSG_CHECKING([whether pgdat_list is available])
1423 SPL_LINUX_TRY_COMPILE_SYMBOL([
1424 #include <linux/topology.h>
1425 pg_data_t *tmp = pgdat_list;
1426 ], [], [pgdat_list], [], [
1428 AC_DEFINE(HAVE_PGDAT_LIST, 1, [pgdat_list is available])
1435 dnl # 2.6.18 API change,
1436 dnl # First introduced global_page_state() support as an inline.
1438 AC_DEFUN([SPL_AC_GLOBAL_PAGE_STATE], [
1439 AC_MSG_CHECKING([whether global_page_state() is available])
1440 SPL_LINUX_TRY_COMPILE([
1441 #include <linux/mm.h>
1443 unsigned long state __attribute__ ((unused));
1444 state = global_page_state(0);
1447 AC_DEFINE(HAVE_GLOBAL_PAGE_STATE, 1,
1448 [global_page_state() is available])
1455 dnl # 2.6.21 API change (plus subsequent naming convention changes),
1456 dnl # Public global zone stats now include a free page count. However
1457 dnl # the enumerated names of the counters have changed since this API
1458 dnl # was introduced. We need to deduce the corrent name to use. This
1459 dnl # replaces the priviate get_zone_counts() interface.
1461 dnl # NR_FREE_PAGES was available from 2.6.21 to current kernels, which
1462 dnl # is 2.6.30 as of when this was written.
1464 AC_DEFUN([SPL_AC_ZONE_STAT_ITEM_FREE], [
1465 AC_MSG_CHECKING([whether page state NR_FREE_PAGES is available])
1466 SPL_LINUX_TRY_COMPILE([
1467 #include <linux/mm.h>
1469 enum zone_stat_item zsi __attribute__ ((unused));
1470 zsi = NR_FREE_PAGES;
1473 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_FREE_PAGES, 1,
1474 [Page state NR_FREE_PAGES is available])
1481 dnl # 2.6.21 API change (plus subsequent naming convention changes),
1482 dnl # Public global zone stats now include an inactive page count. However
1483 dnl # the enumerated names of the counters have changed since this API
1484 dnl # was introduced. We need to deduce the corrent name to use. This
1485 dnl # replaces the priviate get_zone_counts() interface.
1487 dnl # NR_INACTIVE was available from 2.6.21 to 2.6.27 and included both
1488 dnl # anonymous and file inactive pages. As of 2.6.28 it was split in
1489 dnl # to NR_INACTIVE_ANON and NR_INACTIVE_FILE.
1491 AC_DEFUN([SPL_AC_ZONE_STAT_ITEM_INACTIVE], [
1492 AC_MSG_CHECKING([whether page state NR_INACTIVE is available])
1493 SPL_LINUX_TRY_COMPILE([
1494 #include <linux/mm.h>
1496 enum zone_stat_item zsi __attribute__ ((unused));
1500 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_INACTIVE, 1,
1501 [Page state NR_INACTIVE is available])
1506 AC_MSG_CHECKING([whether page state NR_INACTIVE_ANON is available])
1507 SPL_LINUX_TRY_COMPILE([
1508 #include <linux/mm.h>
1510 enum zone_stat_item zsi __attribute__ ((unused));
1511 zsi = NR_INACTIVE_ANON;
1514 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_ANON, 1,
1515 [Page state NR_INACTIVE_ANON is available])
1520 AC_MSG_CHECKING([whether page state NR_INACTIVE_FILE is available])
1521 SPL_LINUX_TRY_COMPILE([
1522 #include <linux/mm.h>
1524 enum zone_stat_item zsi __attribute__ ((unused));
1525 zsi = NR_INACTIVE_FILE;
1528 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_FILE, 1,
1529 [Page state NR_INACTIVE_FILE is available])
1536 dnl # 2.6.21 API change (plus subsequent naming convention changes),
1537 dnl # Public global zone stats now include an active page count. However
1538 dnl # the enumerated names of the counters have changed since this API
1539 dnl # was introduced. We need to deduce the corrent name to use. This
1540 dnl # replaces the priviate get_zone_counts() interface.
1542 dnl # NR_ACTIVE was available from 2.6.21 to 2.6.27 and included both
1543 dnl # anonymous and file active pages. As of 2.6.28 it was split in
1544 dnl # to NR_ACTIVE_ANON and NR_ACTIVE_FILE.
1546 AC_DEFUN([SPL_AC_ZONE_STAT_ITEM_ACTIVE], [
1547 AC_MSG_CHECKING([whether page state NR_ACTIVE is available])
1548 SPL_LINUX_TRY_COMPILE([
1549 #include <linux/mm.h>
1551 enum zone_stat_item zsi __attribute__ ((unused));
1555 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_ACTIVE, 1,
1556 [Page state NR_ACTIVE is available])
1561 AC_MSG_CHECKING([whether page state NR_ACTIVE_ANON is available])
1562 SPL_LINUX_TRY_COMPILE([
1563 #include <linux/mm.h>
1565 enum zone_stat_item zsi __attribute__ ((unused));
1566 zsi = NR_ACTIVE_ANON;
1569 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_ANON, 1,
1570 [Page state NR_ACTIVE_ANON is available])
1575 AC_MSG_CHECKING([whether page state NR_ACTIVE_FILE is available])
1576 SPL_LINUX_TRY_COMPILE([
1577 #include <linux/mm.h>
1579 enum zone_stat_item zsi __attribute__ ((unused));
1580 zsi = NR_ACTIVE_FILE;
1583 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_FILE, 1,
1584 [Page state NR_ACTIVE_FILE is available])
1591 dnl # Proposed API change for legacy kernels.
1592 dnl # This symbol is not available in older kernels. For kernels post
1593 dnl # 2.6.21 the global_page_state() API is used to get free/inactive/active
1594 dnl # page state information. This symbol is only used in legacy kernels
1595 dnl # any only as a last resort.
1597 AC_DEFUN([SPL_AC_GET_ZONE_COUNTS], [
1598 AC_MSG_CHECKING([whether symbol get_zone_counts is needed])
1599 SPL_LINUX_TRY_COMPILE([
1601 #if !defined(HAVE_ZONE_STAT_ITEM_NR_FREE_PAGES)
1602 #error "global_page_state needs NR_FREE_PAGES"
1605 #if !defined(HAVE_ZONE_STAT_ITEM_NR_ACTIVE) && \
1606 !defined(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_ANON) && \
1607 !defined(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_FILE)
1608 #error "global_page_state needs NR_ACTIVE*"
1611 #if !defined(HAVE_ZONE_STAT_ITEM_NR_INACTIVE) && \
1612 !defined(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_ANON) && \
1613 !defined(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_FILE)
1614 #error "global_page_state needs NR_INACTIVE*"
1620 AC_DEFINE(NEED_GET_ZONE_COUNTS, 1,
1621 [get_zone_counts() is needed])
1623 AC_MSG_CHECKING([whether get_zone_counts() is available])
1624 SPL_LINUX_TRY_COMPILE_SYMBOL([
1625 #include <linux/mmzone.h>
1627 get_zone_counts(NULL, NULL, NULL);
1628 ], [get_zone_counts], [], [
1630 AC_DEFINE(HAVE_GET_ZONE_COUNTS, 1,
1631 [get_zone_counts() is available])
1639 dnl # 2.6.27 API change,
1640 dnl # The user_path_dir() replaces __user_walk()
1642 AC_DEFUN([SPL_AC_USER_PATH_DIR],
1643 [AC_MSG_CHECKING([whether user_path_dir() is available])
1644 SPL_LINUX_TRY_COMPILE_SYMBOL([
1645 #include <linux/fcntl.h>
1646 #include <linux/namei.h>
1648 user_path_dir(NULL, NULL);
1649 ], [user_path_at], [], [
1651 AC_DEFINE(HAVE_USER_PATH_DIR, 1, [user_path_dir() is available])
1658 dnl # Symbol available in RHEL kernels not in stock kernels.
1660 AC_DEFUN([SPL_AC_SET_FS_PWD],
1661 [AC_MSG_CHECKING([whether set_fs_pwd() is available])
1662 SPL_LINUX_TRY_COMPILE_SYMBOL([
1663 #include <linux/spinlock.h>
1664 #include <linux/fs_struct.h>
1667 ], [set_fs_pwd], [], [
1669 AC_DEFINE(HAVE_SET_FS_PWD, 1, [set_fs_pwd() is available])
1676 dnl # 2.6.25 API change,
1677 dnl # Simplied API by replacing mnt+dentry args with a single path arg.
1679 AC_DEFUN([SPL_AC_2ARGS_SET_FS_PWD],
1680 [AC_MSG_CHECKING([whether set_fs_pwd() wants 2 args])
1681 SPL_LINUX_TRY_COMPILE([
1682 #include <linux/sched.h>
1683 #include <linux/fs_struct.h>
1685 set_fs_pwd(NULL, NULL);
1688 AC_DEFINE(HAVE_2ARGS_SET_FS_PWD, 1,
1689 [set_fs_pwd() wants 2 args])
1690 HAVE_2ARGS_SET_FS_PWD=yes
1697 dnl # 3.9 API change
1698 dnl # set_fs_pwd takes const struct path *
1700 AC_DEFUN([SPL_AC_SET_FS_PWD_WITH_CONST],
1701 if test "x$HAVE_2ARGS_SET_FS_PWD" = xyes; then
1702 tmp_flags="$EXTRA_KCFLAGS"
1703 EXTRA_KCFLAGS="-Werror"
1704 [AC_MSG_CHECKING([whether set_fs_pwd() requires const struct path *])
1705 SPL_LINUX_TRY_COMPILE([
1706 #include <linux/spinlock.h>
1707 #include <linux/fs_struct.h>
1708 #include <linux/path.h>
1709 void (*const set_fs_pwd_func)
1710 (struct fs_struct *, const struct path *)
1716 AC_DEFINE(HAVE_SET_FS_PWD_WITH_CONST, 1,
1717 [set_fs_pwd() needs const path *])
1719 SPL_LINUX_TRY_COMPILE([
1720 #include <linux/spinlock.h>
1721 #include <linux/fs_struct.h>
1722 #include <linux/path.h>
1723 void (*const set_fs_pwd_func)
1724 (struct fs_struct *, struct path *)
1731 AC_MSG_ERROR(unknown)
1734 EXTRA_KCFLAGS="$tmp_flags"
1739 dnl # SLES API change, never adopted in mainline,
1740 dnl # Third 'struct vfsmount *' argument removed.
1742 AC_DEFUN([SPL_AC_2ARGS_VFS_UNLINK],
1743 [AC_MSG_CHECKING([whether vfs_unlink() wants 2 args])
1744 SPL_LINUX_TRY_COMPILE([
1745 #include <linux/fs.h>
1747 vfs_unlink(NULL, NULL);
1750 AC_DEFINE(HAVE_2ARGS_VFS_UNLINK, 1,
1751 [vfs_unlink() wants 2 args])
1758 dnl # SLES API change, never adopted in mainline,
1759 dnl # Third and sixth 'struct vfsmount *' argument removed.
1761 AC_DEFUN([SPL_AC_4ARGS_VFS_RENAME],
1762 [AC_MSG_CHECKING([whether vfs_rename() wants 4 args])
1763 SPL_LINUX_TRY_COMPILE([
1764 #include <linux/fs.h>
1766 vfs_rename(NULL, NULL, NULL, NULL);
1769 AC_DEFINE(HAVE_4ARGS_VFS_RENAME, 1,
1770 [vfs_rename() wants 4 args])
1777 dnl # 2.6.36 API change,
1778 dnl # The 'struct fs_struct->lock' was changed from a rwlock_t to
1779 dnl # a spinlock_t to improve the fastpath performance.
1781 AC_DEFUN([SPL_AC_FS_STRUCT_SPINLOCK], [
1782 AC_MSG_CHECKING([whether struct fs_struct uses spinlock_t])
1783 tmp_flags="$EXTRA_KCFLAGS"
1784 EXTRA_KCFLAGS="-Werror"
1785 SPL_LINUX_TRY_COMPILE([
1786 #include <linux/sched.h>
1787 #include <linux/fs_struct.h>
1789 struct fs_struct fs;
1790 spin_lock_init(&fs.lock);
1793 AC_DEFINE(HAVE_FS_STRUCT_SPINLOCK, 1,
1794 [struct fs_struct uses spinlock_t])
1798 EXTRA_KCFLAGS="$tmp_flags"
1802 dnl # 2.6.29 API change,
1803 dnl # check whether 'struct cred' exists
1805 AC_DEFUN([SPL_AC_CRED_STRUCT], [
1806 AC_MSG_CHECKING([whether struct cred exists])
1807 SPL_LINUX_TRY_COMPILE([
1808 #include <linux/cred.h>
1810 struct cred *cr __attribute__ ((unused));
1814 AC_DEFINE(HAVE_CRED_STRUCT, 1, [struct cred exists])
1821 dnl # Custom SPL patch may export this symbol.
1823 AC_DEFUN([SPL_AC_GROUPS_SEARCH],
1824 [AC_MSG_CHECKING([whether groups_search() is available])
1825 SPL_LINUX_TRY_COMPILE_SYMBOL([
1826 #include <linux/cred.h>
1828 groups_search(NULL, 0);
1829 ], [groups_search], [], [
1831 AC_DEFINE(HAVE_GROUPS_SEARCH, 1, [groups_search() is available])
1838 dnl # 2.6.x API change,
1839 dnl # __put_task_struct() was exported in RHEL5 but unavailable elsewhere.
1841 AC_DEFUN([SPL_AC_PUT_TASK_STRUCT],
1842 [AC_MSG_CHECKING([whether __put_task_struct() is available])
1843 SPL_LINUX_TRY_COMPILE_SYMBOL([
1844 #include <linux/sched.h>
1846 __put_task_struct(NULL);
1847 ], [__put_task_struct], [], [
1849 AC_DEFINE(HAVE_PUT_TASK_STRUCT, 1,
1850 [__put_task_struct() is available])
1857 dnl # 2.6.32 API change,
1858 dnl # Unused 'struct file *' removed from prototype.
1860 AC_DEFUN([SPL_AC_5ARGS_PROC_HANDLER], [
1861 AC_MSG_CHECKING([whether proc_handler() wants 5 args])
1862 SPL_LINUX_TRY_COMPILE([
1863 #include <linux/sysctl.h>
1865 proc_dostring(NULL, 0, NULL, NULL, NULL);
1868 AC_DEFINE(HAVE_5ARGS_PROC_HANDLER, 1,
1869 [proc_handler() wants 5 args])
1876 dnl # 2.6.x API change,
1877 dnl # kvasprintf() function added.
1879 AC_DEFUN([SPL_AC_KVASPRINTF],
1880 [AC_MSG_CHECKING([whether kvasprintf() is available])
1881 SPL_LINUX_TRY_COMPILE_SYMBOL([
1882 #include <linux/kernel.h>
1884 kvasprintf(0, NULL, *((va_list*)NULL));
1885 ], [kvasprintf], [], [
1887 AC_DEFINE(HAVE_KVASPRINTF, 1, [kvasprintf() is available])
1894 dnl # 2.6.29 API change,
1895 dnl # vfs_fsync() funcation added, prior to this use file_fsync().
1897 AC_DEFUN([SPL_AC_VFS_FSYNC],
1898 [AC_MSG_CHECKING([whether vfs_fsync() is available])
1899 SPL_LINUX_TRY_COMPILE_SYMBOL([
1900 #include <linux/fs.h>
1903 ], [vfs_fsync], [fs/sync.c], [
1905 AC_DEFINE(HAVE_VFS_FSYNC, 1, [vfs_fsync() is available])
1912 dnl # 2.6.35 API change,
1913 dnl # Unused 'struct dentry *' removed from vfs_fsync() prototype.
1915 AC_DEFUN([SPL_AC_2ARGS_VFS_FSYNC], [
1916 AC_MSG_CHECKING([whether vfs_fsync() wants 2 args])
1917 SPL_LINUX_TRY_COMPILE([
1918 #include <linux/fs.h>
1923 AC_DEFINE(HAVE_2ARGS_VFS_FSYNC, 1, [vfs_fsync() wants 2 args])
1930 dnl # 3.5 API change,
1931 dnl # inode_operations.truncate_range removed
1933 AC_DEFUN([SPL_AC_INODE_TRUNCATE_RANGE], [
1934 AC_MSG_CHECKING([whether truncate_range() inode operation is available])
1935 SPL_LINUX_TRY_COMPILE([
1936 #include <linux/fs.h>
1938 struct inode_operations ops;
1939 ops.truncate_range = NULL;
1942 AC_DEFINE(HAVE_INODE_TRUNCATE_RANGE, 1,
1943 [truncate_range() inode operation is available])
1950 dnl # Linux 2.6.38 - 3.x API
1952 AC_DEFUN([SPL_AC_KERNEL_FILE_FALLOCATE], [
1953 AC_MSG_CHECKING([whether fops->fallocate() exists])
1954 SPL_LINUX_TRY_COMPILE([
1955 #include <linux/fs.h>
1957 long (*fallocate) (struct file *, int, loff_t, loff_t) = NULL;
1958 struct file_operations fops __attribute__ ((unused)) = {
1959 .fallocate = fallocate,
1963 AC_DEFINE(HAVE_FILE_FALLOCATE, 1, [fops->fallocate() exists])
1970 dnl # Linux 2.6.x - 2.6.37 API
1972 AC_DEFUN([SPL_AC_KERNEL_INODE_FALLOCATE], [
1973 AC_MSG_CHECKING([whether iops->fallocate() exists])
1974 SPL_LINUX_TRY_COMPILE([
1975 #include <linux/fs.h>
1977 long (*fallocate) (struct inode *, int, loff_t, loff_t) = NULL;
1978 struct inode_operations fops __attribute__ ((unused)) = {
1979 .fallocate = fallocate,
1983 AC_DEFINE(HAVE_INODE_FALLOCATE, 1, [fops->fallocate() exists])
1990 dnl # PaX Linux 2.6.38 - 3.x API
1992 AC_DEFUN([SPL_AC_PAX_KERNEL_FILE_FALLOCATE], [
1993 AC_MSG_CHECKING([whether fops->fallocate() exists])
1994 SPL_LINUX_TRY_COMPILE([
1995 #include <linux/fs.h>
1997 long (*fallocate) (struct file *, int, loff_t, loff_t) = NULL;
1998 struct file_operations_no_const fops __attribute__ ((unused)) = {
1999 .fallocate = fallocate,
2003 AC_DEFINE(HAVE_FILE_FALLOCATE, 1, [fops->fallocate() exists])
2010 dnl # The fallocate callback was moved from the inode_operations
2011 dnl # structure to the file_operations structure.
2013 AC_DEFUN([SPL_AC_KERNEL_FALLOCATE], [
2014 SPL_AC_KERNEL_FILE_FALLOCATE
2015 SPL_AC_KERNEL_INODE_FALLOCATE
2016 SPL_AC_PAX_KERNEL_FILE_FALLOCATE
2020 dnl # 2.6.33 API change. Also backported in RHEL5 as of 2.6.18-190.el5.
2021 dnl # Earlier versions of rwsem_is_locked() were inline and had a race
2022 dnl # condition. The fixed version is exported as a symbol. The race
2023 dnl # condition is fixed by acquiring sem->wait_lock, so we must not
2024 dnl # call that version while holding sem->wait_lock.
2026 AC_DEFUN([SPL_AC_EXPORTED_RWSEM_IS_LOCKED],
2027 [AC_MSG_CHECKING([whether rwsem_is_locked() acquires sem->wait_lock])
2028 SPL_LINUX_TRY_COMPILE_SYMBOL([
2029 #include <linux/rwsem.h>
2030 int rwsem_is_locked(struct rw_semaphore *sem) { return 0; }
2031 ], [], [rwsem_is_locked], [lib/rwsem-spinlock.c], [
2033 AC_DEFINE(RWSEM_IS_LOCKED_TAKES_WAIT_LOCK, 1,
2034 [rwsem_is_locked() acquires sem->wait_lock])
2041 dnl # 2.6.xx API compat,
2042 dnl # There currently exists no exposed API to partially shrink the dcache.
2043 dnl # The expected mechanism to shrink the cache is a registered shrinker
2044 dnl # which is called during memory pressure.
2046 AC_DEFUN([SPL_AC_SHRINK_DCACHE_MEMORY],
2047 [AC_MSG_CHECKING([whether shrink_dcache_memory() is available])
2048 SPL_LINUX_TRY_COMPILE_SYMBOL([
2049 #include <linux/dcache.h>
2051 shrink_dcache_memory(0, 0);
2052 ], [shrink_dcache_memory], [fs/dcache.c], [
2054 AC_DEFINE(HAVE_SHRINK_DCACHE_MEMORY, 1,
2055 [shrink_dcache_memory() is available])
2062 dnl # 2.6.xx API compat,
2063 dnl # There currently exists no exposed API to partially shrink the icache.
2064 dnl # The expected mechanism to shrink the cache is a registered shrinker
2065 dnl # which is called during memory pressure.
2067 AC_DEFUN([SPL_AC_SHRINK_ICACHE_MEMORY],
2068 [AC_MSG_CHECKING([whether shrink_icache_memory() is available])
2069 SPL_LINUX_TRY_COMPILE_SYMBOL([
2070 #include <linux/dcache.h>
2072 shrink_icache_memory(0, 0);
2073 ], [shrink_icache_memory], [fs/inode.c], [
2075 AC_DEFINE(HAVE_SHRINK_ICACHE_MEMORY, 1,
2076 [shrink_icache_memory() is available])
2083 dnl # 2.6.39 API compat,
2084 dnl # The path_lookup() function has been renamed to kern_path_parent()
2085 dnl # and the flags argument has been removed. The only behavior now
2086 dnl # offered is that of LOOKUP_PARENT. The spl already always passed
2087 dnl # this flag so dropping the flag does not impact us.
2089 AC_DEFUN([SPL_AC_KERN_PATH_PARENT_HEADER], [
2090 SPL_CHECK_SYMBOL_HEADER(
2092 [int kern_path_parent(const char \*, struct nameidata \*)],
2093 [include/linux/namei.h],
2094 [AC_DEFINE(HAVE_KERN_PATH_PARENT_HEADER, 1,
2095 [kern_path_parent() is available])],
2100 dnl # 3.1 API compat,
2101 dnl # The kern_path_parent() symbol is no longer exported by the kernel.
2102 dnl # However, it remains the prefered interface and since we still have
2103 dnl # access to the prototype we dynamically lookup the required address.
2105 AC_DEFUN([SPL_AC_KERN_PATH_PARENT_SYMBOL],
2106 [AC_MSG_CHECKING([whether kern_path_parent() is available])
2107 SPL_LINUX_TRY_COMPILE_SYMBOL([
2108 #include <linux/namei.h>
2110 kern_path_parent(NULL, NULL);
2111 ], [kern_path_parent], [fs/namei.c], [
2113 AC_DEFINE(HAVE_KERN_PATH_PARENT_SYMBOL, 1,
2114 [kern_path_parent() is available])
2121 dnl # 3.6 API compat,
2122 dnl # The kern_path_parent() function was replaced by the kern_path_locked()
2123 dnl # function to eliminate all struct nameidata usage outside fs/namei.c.
2125 AC_DEFUN([SPL_AC_KERN_PATH_LOCKED], [
2126 SPL_CHECK_SYMBOL_HEADER(
2128 [struct dentry \*kern_path_locked(const char \*, struct path \*)],
2129 [include/linux/namei.h],
2130 [AC_DEFINE(HAVE_KERN_PATH_LOCKED, 1,
2131 [kern_path_locked() is available])],
2136 dnl # /proc/kallsyms support,
2137 dnl # Verify the kernel has CONFIG_KALLSYMS support enabled.
2139 AC_DEFUN([SPL_AC_CONFIG_KALLSYMS], [
2140 AC_MSG_CHECKING([whether CONFIG_KALLSYMS is defined])
2141 SPL_LINUX_TRY_COMPILE([
2142 #if !defined(CONFIG_KALLSYMS)
2143 #error CONFIG_KALLSYMS not defined
2146 AC_MSG_RESULT([yes])
2150 *** This kernel does not include the required kallsyms support.
2151 *** Rebuild the kernel with CONFIG_KALLSYMS=y set.])
2156 dnl # zlib inflate compat,
2157 dnl # Verify the kernel has CONFIG_ZLIB_INFLATE support enabled.
2159 AC_DEFUN([SPL_AC_CONFIG_ZLIB_INFLATE], [
2160 AC_MSG_CHECKING([whether CONFIG_ZLIB_INFLATE is defined])
2161 SPL_LINUX_TRY_COMPILE([
2162 #if !defined(CONFIG_ZLIB_INFLATE) && \
2163 !defined(CONFIG_ZLIB_INFLATE_MODULE)
2164 #error CONFIG_ZLIB_INFLATE not defined
2167 AC_MSG_RESULT([yes])
2171 *** This kernel does not include the required zlib inflate support.
2172 *** Rebuild the kernel with CONFIG_ZLIB_INFLATE=y|m set.])
2177 dnl # zlib deflate compat,
2178 dnl # Verify the kernel has CONFIG_ZLIB_DEFLATE support enabled.
2180 AC_DEFUN([SPL_AC_CONFIG_ZLIB_DEFLATE], [
2181 AC_MSG_CHECKING([whether CONFIG_ZLIB_DEFLATE is defined])
2182 SPL_LINUX_TRY_COMPILE([
2183 #if !defined(CONFIG_ZLIB_DEFLATE) && \
2184 !defined(CONFIG_ZLIB_DEFLATE_MODULE)
2185 #error CONFIG_ZLIB_DEFLATE not defined
2188 AC_MSG_RESULT([yes])
2192 *** This kernel does not include the required zlib deflate support.
2193 *** Rebuild the kernel with CONFIG_ZLIB_DEFLATE=y|m set.])
2198 dnl # 2.6.39 API compat,
2199 dnl # The function zlib_deflate_workspacesize() now take 2 arguments.
2200 dnl # This was done to avoid always having to allocate the maximum size
2201 dnl # workspace (268K). The caller can now specific the windowBits and
2202 dnl # memLevel compression parameters to get a smaller workspace.
2204 AC_DEFUN([SPL_AC_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE],
2205 [AC_MSG_CHECKING([whether zlib_deflate_workspacesize() wants 2 args])
2206 SPL_LINUX_TRY_COMPILE([
2207 #include <linux/zlib.h>
2209 return zlib_deflate_workspacesize(MAX_WBITS, MAX_MEM_LEVEL);
2212 AC_DEFINE(HAVE_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE, 1,
2213 [zlib_deflate_workspacesize() wants 2 args])
2220 dnl # 2.6.39 API change,
2221 dnl # Shrinker adjust to use common shrink_control structure.
2223 AC_DEFUN([SPL_AC_SHRINK_CONTROL_STRUCT], [
2224 AC_MSG_CHECKING([whether struct shrink_control exists])
2225 SPL_LINUX_TRY_COMPILE([
2226 #include <linux/mm.h>
2228 struct shrink_control sc __attribute__ ((unused));
2231 sc.gfp_mask = GFP_KERNEL;
2234 AC_DEFINE(HAVE_SHRINK_CONTROL_STRUCT, 1,
2235 [struct shrink_control exists])
2242 dnl # 3.1 API Change
2244 dnl # The rw_semaphore.wait_lock member was changed from spinlock_t to
2245 dnl # raw_spinlock_t at commit ddb6c9b58a19edcfac93ac670b066c836ff729f1.
2247 AC_DEFUN([SPL_AC_RWSEM_SPINLOCK_IS_RAW], [
2248 AC_MSG_CHECKING([whether struct rw_semaphore member wait_lock is raw])
2249 tmp_flags="$EXTRA_KCFLAGS"
2250 EXTRA_KCFLAGS="-Werror"
2251 SPL_LINUX_TRY_COMPILE([
2252 #include <linux/rwsem.h>
2254 struct rw_semaphore dummy_semaphore __attribute__ ((unused));
2255 raw_spinlock_t dummy_lock __attribute__ ((unused));
2256 dummy_semaphore.wait_lock = dummy_lock;
2259 AC_DEFINE(RWSEM_SPINLOCK_IS_RAW, 1,
2260 [struct rw_semaphore member wait_lock is raw_spinlock_t])
2264 EXTRA_KCFLAGS="$tmp_flags"
2268 dnl # 3.9 API change,
2269 dnl # Moved things from linux/sched.h to linux/sched/rt.h
2271 AC_DEFUN([SPL_AC_SCHED_RT_HEADER],
2272 [AC_MSG_CHECKING([whether header linux/sched/rt.h exists])
2273 SPL_LINUX_TRY_COMPILE([
2274 #include <linux/sched.h>
2275 #include <linux/sched/rt.h>
2279 AC_DEFINE(HAVE_SCHED_RT_HEADER, 1, [linux/sched/rt.h exists])
2287 dnl # 3.9 API change,
2288 dnl # vfs_getattr() uses 2 args
2289 dnl # It takes struct path * instead of struct vfsmount * and struct dentry *
2291 AC_DEFUN([SPL_AC_2ARGS_VFS_GETATTR], [
2292 AC_MSG_CHECKING([whether vfs_getattr() wants])
2293 SPL_LINUX_TRY_COMPILE([
2294 #include <linux/fs.h>
2296 vfs_getattr((struct path *) NULL,
2297 (struct kstat *)NULL);
2299 AC_MSG_RESULT(2 args)
2300 AC_DEFINE(HAVE_2ARGS_VFS_GETATTR, 1,
2301 [vfs_getattr wants 2 args])
2303 SPL_LINUX_TRY_COMPILE([
2304 #include <linux/fs.h>
2306 vfs_getattr((struct vfsmount *)NULL,
2307 (struct dentry *)NULL,
2308 (struct kstat *)NULL);
2310 AC_MSG_RESULT(3 args)
2312 AC_MSG_ERROR(unknown)