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="$KERNELCPPFLAGS -Wstrict-prototypes"
18 AC_SUBST(KERNELCPPFLAGS)
22 SPL_AC_DEBUG_KMEM_TRACKING
24 SPL_AC_ATOMIC_SPINLOCK
25 SPL_AC_SHRINKER_CALLBACK
27 SPL_AC_CONFIG_TRIM_UNUSED_KSYMS
29 SPL_AC_SET_FS_PWD_WITH_CONST
30 SPL_AC_2ARGS_VFS_UNLINK
31 SPL_AC_4ARGS_VFS_RENAME
32 SPL_AC_2ARGS_VFS_FSYNC
33 SPL_AC_INODE_TRUNCATE_RANGE
34 SPL_AC_FS_STRUCT_SPINLOCK
36 SPL_AC_PUT_TASK_STRUCT
37 SPL_AC_KERNEL_FALLOCATE
38 SPL_AC_CONFIG_ZLIB_INFLATE
39 SPL_AC_CONFIG_ZLIB_DEFLATE
40 SPL_AC_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE
41 SPL_AC_SHRINK_CONTROL_STRUCT
42 SPL_AC_RWSEM_SPINLOCK_IS_RAW
44 SPL_AC_RWSEM_ATOMIC_LONG_COUNT
45 SPL_AC_SCHED_RT_HEADER
46 SPL_AC_2ARGS_VFS_GETATTR
48 SPL_AC_KMEM_CACHE_ALLOCFLAGS
55 AC_DEFUN([SPL_AC_MODULE_SYMVERS], [
56 modpost=$LINUX/scripts/Makefile.modpost
57 AC_MSG_CHECKING([kernel file name for module symbols])
58 if test "x$enable_linux_builtin" != xyes -a -f "$modpost"; then
59 if grep -q Modules.symvers $modpost; then
60 LINUX_SYMBOLS=Modules.symvers
62 LINUX_SYMBOLS=Module.symvers
65 if ! test -f "$LINUX_OBJ/$LINUX_SYMBOLS"; then
67 *** Please make sure the kernel devel package for your distribution
68 *** is installed. If you are building with a custom kernel, make sure the
69 *** kernel is configured, built, and the '--with-linux=PATH' configure
70 *** option refers to the location of the kernel source.])
75 AC_MSG_RESULT($LINUX_SYMBOLS)
76 AC_SUBST(LINUX_SYMBOLS)
79 AC_DEFUN([SPL_AC_KERNEL], [
81 AS_HELP_STRING([--with-linux=PATH],
82 [Path to kernel source]),
83 [kernelsrc="$withval"])
85 AC_ARG_WITH([linux-obj],
86 AS_HELP_STRING([--with-linux-obj=PATH],
87 [Path to kernel build objects]),
88 [kernelbuild="$withval"])
90 AC_MSG_CHECKING([kernel source directory])
91 if test -z "$kernelsrc"; then
92 if test -e "/lib/modules/$(uname -r)/source"; then
93 headersdir="/lib/modules/$(uname -r)/source"
94 sourcelink=$(readlink -f "$headersdir")
95 elif test -e "/lib/modules/$(uname -r)/build"; then
96 headersdir="/lib/modules/$(uname -r)/build"
97 sourcelink=$(readlink -f "$headersdir")
99 sourcelink=$(ls -1d /usr/src/kernels/* \
101 2>/dev/null | grep -v obj | tail -1)
104 if test -n "$sourcelink" && test -e ${sourcelink}; then
105 kernelsrc=`readlink -f ${sourcelink}`
107 kernelsrc="[Not found]"
110 if test "$kernelsrc" = "NONE"; then
115 AC_MSG_RESULT([$kernelsrc])
116 if test ! -d "$kernelsrc"; then
118 *** Please make sure the kernel devel package for your distribution
119 *** is installed and then try again. If that fails, you can specify the
120 *** location of the kernel source with the '--with-linux=PATH' option.])
123 AC_MSG_CHECKING([kernel build directory])
124 if test -z "$kernelbuild"; then
125 if test -e "/lib/modules/$(uname -r)/build"; then
126 kernelbuild=`readlink -f /lib/modules/$(uname -r)/build`
127 elif test -d ${kernelsrc}-obj/${target_cpu}/${target_cpu}; then
128 kernelbuild=${kernelsrc}-obj/${target_cpu}/${target_cpu}
129 elif test -d ${kernelsrc}-obj/${target_cpu}/default; then
130 kernelbuild=${kernelsrc}-obj/${target_cpu}/default
131 elif test -d `dirname ${kernelsrc}`/build-${target_cpu}; then
132 kernelbuild=`dirname ${kernelsrc}`/build-${target_cpu}
134 kernelbuild=${kernelsrc}
137 AC_MSG_RESULT([$kernelbuild])
139 AC_MSG_CHECKING([kernel source version])
140 utsrelease1=$kernelbuild/include/linux/version.h
141 utsrelease2=$kernelbuild/include/linux/utsrelease.h
142 utsrelease3=$kernelbuild/include/generated/utsrelease.h
143 if test -r $utsrelease1 && fgrep -q UTS_RELEASE $utsrelease1; then
144 utsrelease=linux/version.h
145 elif test -r $utsrelease2 && fgrep -q UTS_RELEASE $utsrelease2; then
146 utsrelease=linux/utsrelease.h
147 elif test -r $utsrelease3 && fgrep -q UTS_RELEASE $utsrelease3; then
148 utsrelease=generated/utsrelease.h
151 if test "$utsrelease"; then
152 kernsrcver=`(echo "#include <$utsrelease>";
153 echo "kernsrcver=UTS_RELEASE") |
154 cpp -I $kernelbuild/include |
155 grep "^kernsrcver=" | cut -d \" -f 2`
157 if test -z "$kernsrcver"; then
158 AC_MSG_RESULT([Not found])
159 AC_MSG_ERROR([*** Cannot determine kernel version.])
162 AC_MSG_RESULT([Not found])
163 if test "x$enable_linux_builtin" != xyes; then
164 AC_MSG_ERROR([*** Cannot find UTS_RELEASE definition.])
167 *** Cannot find UTS_RELEASE definition.
168 *** Please run 'make prepare' inside the kernel source tree.])
172 AC_MSG_RESULT([$kernsrcver])
175 LINUX_OBJ=${kernelbuild}
176 LINUX_VERSION=${kernsrcver}
180 AC_SUBST(LINUX_VERSION)
182 SPL_AC_MODULE_SYMVERS
186 dnl # Default SPL user configuration
188 AC_DEFUN([SPL_AC_CONFIG_USER], [])
191 dnl # Check for rpm+rpmbuild to build RPM packages. If these tools
192 dnl # are missing, it is non-fatal, but you will not be able to build
193 dnl # RPM packages and will be warned if you try too.
195 dnl # By default, the generic spec file will be used because it requires
196 dnl # minimal dependencies. Distribution specific spec files can be
197 dnl # placed under the 'rpm/<distribution>' directory and enabled using
198 dnl # the --with-spec=<distribution> configure option.
200 AC_DEFUN([SPL_AC_RPM], [
204 AC_MSG_CHECKING([whether $RPM is available])
205 AS_IF([tmp=$($RPM --version 2>/dev/null)], [
206 RPM_VERSION=$(echo $tmp | $AWK '/RPM/ { print $[3] }')
208 AC_MSG_RESULT([$HAVE_RPM ($RPM_VERSION)])
211 AC_MSG_RESULT([$HAVE_RPM])
214 AC_MSG_CHECKING([whether $RPMBUILD is available])
215 AS_IF([tmp=$($RPMBUILD --version 2>/dev/null)], [
216 RPMBUILD_VERSION=$(echo $tmp | $AWK '/RPM/ { print $[3] }')
218 AC_MSG_RESULT([$HAVE_RPMBUILD ($RPMBUILD_VERSION)])
221 AC_MSG_RESULT([$HAVE_RPMBUILD])
224 RPM_DEFINE_COMMON='--define "$(DEBUG_SPL) 1" --define "$(DEBUG_KMEM) 1" --define "$(DEBUG_KMEM_TRACKING) 1"'
226 RPM_DEFINE_KMOD='--define "kernels $(LINUX_VERSION)"'
229 SRPM_DEFINE_COMMON='--define "build_src_rpm 1"'
234 RPM_SPEC_DIR="rpm/generic"
236 AS_HELP_STRING([--with-spec=SPEC],
237 [Spec files 'generic|redhat']),
238 [RPM_SPEC_DIR="rpm/$withval"])
240 AC_MSG_CHECKING([whether spec files are available])
241 AC_MSG_RESULT([yes ($RPM_SPEC_DIR/*.spec.in)])
245 AC_SUBST(RPM_VERSION)
247 AC_SUBST(HAVE_RPMBUILD)
249 AC_SUBST(RPMBUILD_VERSION)
251 AC_SUBST(RPM_SPEC_DIR)
252 AC_SUBST(RPM_DEFINE_UTIL)
253 AC_SUBST(RPM_DEFINE_KMOD)
254 AC_SUBST(RPM_DEFINE_DKMS)
255 AC_SUBST(RPM_DEFINE_COMMON)
256 AC_SUBST(SRPM_DEFINE_UTIL)
257 AC_SUBST(SRPM_DEFINE_KMOD)
258 AC_SUBST(SRPM_DEFINE_DKMS)
259 AC_SUBST(SRPM_DEFINE_COMMON)
263 dnl # Check for dpkg+dpkg-buildpackage to build DEB packages. If these
264 dnl # tools are missing it is non-fatal but you will not be able to build
265 dnl # DEB packages and will be warned if you try too.
267 AC_DEFUN([SPL_AC_DPKG], [
269 DPKGBUILD=dpkg-buildpackage
271 AC_MSG_CHECKING([whether $DPKG is available])
272 AS_IF([tmp=$($DPKG --version 2>/dev/null)], [
273 DPKG_VERSION=$(echo $tmp | $AWK '/Debian/ { print $[7] }')
275 AC_MSG_RESULT([$HAVE_DPKG ($DPKG_VERSION)])
278 AC_MSG_RESULT([$HAVE_DPKG])
281 AC_MSG_CHECKING([whether $DPKGBUILD is available])
282 AS_IF([tmp=$($DPKGBUILD --version 2>/dev/null)], [
283 DPKGBUILD_VERSION=$(echo $tmp | \
284 $AWK '/Debian/ { print $[4] }' | cut -f-4 -d'.')
286 AC_MSG_RESULT([$HAVE_DPKGBUILD ($DPKGBUILD_VERSION)])
289 AC_MSG_RESULT([$HAVE_DPKGBUILD])
294 AC_SUBST(DPKG_VERSION)
296 AC_SUBST(HAVE_DPKGBUILD)
298 AC_SUBST(DPKGBUILD_VERSION)
302 dnl # Until native packaging for various different packing systems
303 dnl # can be added the least we can do is attempt to use alien to
304 dnl # convert the RPM packages to the needed package type. This is
305 dnl # a hack but so far it has worked reasonable well.
307 AC_DEFUN([SPL_AC_ALIEN], [
310 AC_MSG_CHECKING([whether $ALIEN is available])
311 AS_IF([tmp=$($ALIEN --version 2>/dev/null)], [
312 ALIEN_VERSION=$(echo $tmp | $AWK '{ print $[3] }')
314 AC_MSG_RESULT([$HAVE_ALIEN ($ALIEN_VERSION)])
317 AC_MSG_RESULT([$HAVE_ALIEN])
322 AC_SUBST(ALIEN_VERSION)
326 dnl # Using the VENDOR tag from config.guess set the default
327 dnl # package type for 'make pkg': (rpm | deb | tgz)
329 AC_DEFUN([SPL_AC_DEFAULT_PACKAGE], [
330 AC_MSG_CHECKING([linux distribution])
331 if test -f /etc/toss-release ; then
333 elif test -f /etc/fedora-release ; then
335 elif test -f /etc/redhat-release ; then
337 elif test -f /etc/gentoo-release ; then
339 elif test -f /etc/arch-release ; then
341 elif test -f /etc/SuSE-release ; then
343 elif test -f /etc/slackware-version ; then
345 elif test -f /etc/lunar.release ; then
347 elif test -f /etc/lsb-release ; then
349 elif test -f /etc/debian_version ; then
354 AC_MSG_RESULT([$VENDOR])
357 AC_MSG_CHECKING([default package type])
359 toss) DEFAULT_PACKAGE=rpm ;;
360 redhat) DEFAULT_PACKAGE=rpm ;;
361 fedora) DEFAULT_PACKAGE=rpm ;;
362 gentoo) DEFAULT_PACKAGE=tgz ;;
363 arch) DEFAULT_PACKAGE=tgz ;;
364 sles) DEFAULT_PACKAGE=rpm ;;
365 slackware) DEFAULT_PACKAGE=tgz ;;
366 lunar) DEFAULT_PACKAGE=tgz ;;
367 ubuntu) DEFAULT_PACKAGE=deb ;;
368 debian) DEFAULT_PACKAGE=deb ;;
369 *) DEFAULT_PACKAGE=rpm ;;
372 AC_MSG_RESULT([$DEFAULT_PACKAGE])
373 AC_SUBST(DEFAULT_PACKAGE)
377 dnl # Default SPL user configuration
379 AC_DEFUN([SPL_AC_PACKAGE], [
380 SPL_AC_DEFAULT_PACKAGE
386 AC_DEFUN([SPL_AC_LICENSE], [
387 AC_MSG_CHECKING([spl author])
388 AC_MSG_RESULT([$SPL_META_AUTHOR])
390 AC_MSG_CHECKING([spl license])
391 AC_MSG_RESULT([$SPL_META_LICENSE])
394 AC_DEFUN([SPL_AC_CONFIG], [
396 AC_ARG_WITH([config],
397 AS_HELP_STRING([--with-config=CONFIG],
398 [Config file 'kernel|user|all|srpm']),
399 [SPL_CONFIG="$withval"])
400 AC_ARG_ENABLE([linux-builtin],
401 [AC_HELP_STRING([--enable-linux-builtin],
402 [Configure for builtin in-tree kernel modules @<:@default=no@:>@])],
404 [enable_linux_builtin=no])
406 AC_MSG_CHECKING([spl config])
407 AC_MSG_RESULT([$SPL_CONFIG]);
410 case "$SPL_CONFIG" in
411 kernel) SPL_AC_CONFIG_KERNEL ;;
412 user) SPL_AC_CONFIG_USER ;;
413 all) SPL_AC_CONFIG_KERNEL
414 SPL_AC_CONFIG_USER ;;
417 AC_MSG_RESULT([Error!])
418 AC_MSG_ERROR([Bad value "$SPL_CONFIG" for --with-config,
419 user kernel|user|all|srpm]) ;;
422 AM_CONDITIONAL([CONFIG_USER],
423 [test "$SPL_CONFIG" = user -o "$SPL_CONFIG" = all])
424 AM_CONDITIONAL([CONFIG_KERNEL],
425 [test "$SPL_CONFIG" = kernel -o "$SPL_CONFIG" = all] &&
426 [test "x$enable_linux_builtin" != xyes ])
430 dnl # Enable if the SPL should be compiled with internal debugging enabled.
431 dnl # By default this support is disabled.
433 AC_DEFUN([SPL_AC_DEBUG], [
434 AC_MSG_CHECKING([whether debugging is enabled])
435 AC_ARG_ENABLE([debug],
436 [AS_HELP_STRING([--enable-debug],
437 [Enable generic debug support @<:@default=no@:>@])],
441 AS_IF([test "x$enable_debug" = xyes],
443 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG -Werror"
444 DEBUG_CFLAGS="-DDEBUG -Werror"
445 DEBUG_SPL="_with_debug"
447 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DNDEBUG"
448 DEBUG_CFLAGS="-DNDEBUG"
449 DEBUG_SPL="_without_debug"
452 AC_SUBST(DEBUG_CFLAGS)
454 AC_MSG_RESULT([$enable_debug])
458 dnl # Enabled by default it provides a minimal level of memory tracking.
459 dnl # A total count of bytes allocated is kept for each alloc and free.
460 dnl # Then at module unload time a report to the console will be printed
461 dnl # if memory was leaked.
463 AC_DEFUN([SPL_AC_DEBUG_KMEM], [
464 AC_ARG_ENABLE([debug-kmem],
465 [AS_HELP_STRING([--enable-debug-kmem],
466 [Enable basic kmem accounting @<:@default=no@:>@])],
468 [enable_debug_kmem=no])
470 AS_IF([test "x$enable_debug_kmem" = xyes],
472 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_KMEM"
473 DEBUG_KMEM="_with_debug_kmem"
474 AC_DEFINE([DEBUG_KMEM], [1],
475 [Define to 1 to enable basic kmem accounting])
477 DEBUG_KMEM="_without_debug_kmem"
481 AC_MSG_CHECKING([whether basic kmem accounting is enabled])
482 AC_MSG_RESULT([$enable_debug_kmem])
486 dnl # Disabled by default it provides detailed memory tracking. This
487 dnl # feature also requires --enable-debug-kmem to be set. When enabled
488 dnl # not only will total bytes be tracked but also the location of every
489 dnl # alloc and free. When the SPL module is unloaded a list of all leaked
490 dnl # addresses and where they were allocated will be dumped to the console.
491 dnl # Enabling this feature has a significant impact on performance but it
492 dnl # makes finding memory leaks pretty straight forward.
494 AC_DEFUN([SPL_AC_DEBUG_KMEM_TRACKING], [
495 AC_ARG_ENABLE([debug-kmem-tracking],
496 [AS_HELP_STRING([--enable-debug-kmem-tracking],
497 [Enable detailed kmem tracking @<:@default=no@:>@])],
499 [enable_debug_kmem_tracking=no])
501 AS_IF([test "x$enable_debug_kmem_tracking" = xyes],
503 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_KMEM_TRACKING"
504 DEBUG_KMEM_TRACKING="_with_debug_kmem_tracking"
505 AC_DEFINE([DEBUG_KMEM_TRACKING], [1],
506 [Define to 1 to enable detailed kmem tracking])
508 DEBUG_KMEM_TRACKING="_without_debug_kmem_tracking"
511 AC_SUBST(DEBUG_KMEM_TRACKING)
512 AC_MSG_CHECKING([whether detailed kmem tracking is enabled])
513 AC_MSG_RESULT([$enable_debug_kmem_tracking])
517 dnl # SPL_LINUX_CONFTEST
519 AC_DEFUN([SPL_LINUX_CONFTEST], [
520 cat confdefs.h - <<_ACEOF >conftest.c
526 dnl # SPL_LANG_PROGRAM(C)([PROLOGUE], [BODY])
528 m4_define([SPL_LANG_PROGRAM], [
533 dnl Do *not* indent the following line: there may be CPP directives.
534 dnl Don't move the `;' right after for the same reason.
542 dnl # SPL_LINUX_COMPILE_IFELSE / like AC_COMPILE_IFELSE
544 AC_DEFUN([SPL_LINUX_COMPILE_IFELSE], [
545 m4_ifvaln([$1], [SPL_LINUX_CONFTEST([$1])])
546 rm -Rf build && mkdir -p build && touch build/conftest.mod.c
547 echo "obj-m := conftest.o" >build/Makefile
549 test "x$enable_linux_builtin" = xyes && modpost_flag='modpost=true' # fake modpost stage
551 [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])],
553 [_AC_MSG_LOG_CONFTEST m4_ifvaln([$5],[$5])]
559 dnl # SPL_LINUX_TRY_COMPILE like AC_TRY_COMPILE
561 AC_DEFUN([SPL_LINUX_TRY_COMPILE],
562 [SPL_LINUX_COMPILE_IFELSE(
563 [AC_LANG_SOURCE([SPL_LANG_PROGRAM([[$1]], [[$2]])])],
565 [test -s build/conftest.o],
570 dnl # SPL_CHECK_SYMBOL_EXPORT
571 dnl # check symbol exported or not
573 AC_DEFUN([SPL_CHECK_SYMBOL_EXPORT], [
574 grep -q -E '[[[:space:]]]$1[[[:space:]]]' \
575 $LINUX_OBJ/Module*.symvers 2>/dev/null
577 if test $rc -ne 0; then
580 grep -q -E "EXPORT_SYMBOL.*($1)" \
581 "$LINUX_OBJ/$file" 2>/dev/null
583 if test $rc -eq 0; then
588 if test $export -eq 0; then :
599 dnl # SPL_LINUX_TRY_COMPILE_SYMBOL
600 dnl # like SPL_LINUX_TRY_COMPILE, except SPL_CHECK_SYMBOL_EXPORT
601 dnl # is called if not compiling for builtin
603 AC_DEFUN([SPL_LINUX_TRY_COMPILE_SYMBOL], [
604 SPL_LINUX_TRY_COMPILE([$1], [$2], [rc=0], [rc=1])
605 if test $rc -ne 0; then :
608 if test "x$enable_linux_builtin" != xyes; then
609 SPL_CHECK_SYMBOL_EXPORT([$3], [$4], [rc=0], [rc=1])
611 if test $rc -ne 0; then :
620 dnl # SPL_CHECK_SYMBOL_HEADER
621 dnl # check if a symbol prototype is defined in listed headers.
623 AC_DEFUN([SPL_CHECK_SYMBOL_HEADER], [
624 AC_MSG_CHECKING([whether symbol $1 exists in header])
627 grep -q "$2" "$LINUX/$file" 2>/dev/null
629 if test $rc -eq 0; then
634 if test $header -eq 0; then
644 dnl # SPL_CHECK_HEADER
645 dnl # check whether header exists and define HAVE_$2_HEADER
647 AC_DEFUN([SPL_CHECK_HEADER],
648 [AC_MSG_CHECKING([whether header $1 exists])
649 SPL_LINUX_TRY_COMPILE([
654 AC_DEFINE(HAVE_$2_HEADER, 1, [$1 exists])
664 dnl # Basic toolchain sanity check. Verify that kernel modules can
665 dnl # be built and which symbols can be used.
667 AC_DEFUN([SPL_AC_TEST_MODULE],
668 [AC_MSG_CHECKING([whether modules can be built])
669 SPL_LINUX_TRY_COMPILE([],[],[
673 if test "x$enable_linux_builtin" != xyes; then
674 AC_MSG_ERROR([*** Unable to build an empty module.])
677 *** Unable to build an empty module.
678 *** Please run 'make scripts' inside the kernel source tree.])
682 AS_IF([test "x$cross_compiling" != xyes], [
685 #include "$LINUX/include/linux/license.h"
687 return !license_is_gpl_compatible(
688 "$SPL_META_LICENSE");
691 AC_DEFINE([SPL_IS_GPL_COMPATIBLE], [1],
692 [Define to 1 if GPL-only symbols can be used])
699 dnl # Use the atomic implemenation based on global spinlocks. This
700 dnl # should only be needed by 32-bit kernels which do not provide
701 dnl # the atomic64_* API. It may be optionally enabled as a fallback
702 dnl # if problems are observed with the direct mapping to the native
703 dnl # Linux atomic operations. You may not disable atomic spinlocks
704 dnl # if you kernel does not an atomic64_* API.
706 AC_DEFUN([SPL_AC_ATOMIC_SPINLOCK], [
707 AC_ARG_ENABLE([atomic-spinlocks],
708 [AS_HELP_STRING([--enable-atomic-spinlocks],
709 [Atomic types use spinlocks @<:@default=check@:>@])],
711 [enable_atomic_spinlocks=check])
713 SPL_LINUX_TRY_COMPILE([
714 #include <linux/fs.h>
716 atomic64_t *ptr __attribute__ ((unused));
719 AC_DEFINE(HAVE_ATOMIC64_T, 1,
720 [kernel defines atomic64_t])
725 AS_IF([test "x$enable_atomic_spinlocks" = xcheck], [
726 AS_IF([test "x$have_atomic64_t" = xyes], [
727 enable_atomic_spinlocks=no
729 enable_atomic_spinlocks=yes
733 AS_IF([test "x$enable_atomic_spinlocks" = xyes], [
734 AC_DEFINE([ATOMIC_SPINLOCK], [1],
735 [Atomic types use spinlocks])
737 AS_IF([test "x$have_atomic64_t" = xno], [
739 [--disable-atomic-spinlocks given but required atomic64 support is unavailable])
743 AC_MSG_CHECKING([whether atomic types use spinlocks])
744 AC_MSG_RESULT([$enable_atomic_spinlocks])
746 AC_MSG_CHECKING([whether kernel defines atomic64_t])
747 AC_MSG_RESULT([$have_atomic64_t])
750 AC_DEFUN([SPL_AC_SHRINKER_CALLBACK],[
751 tmp_flags="$EXTRA_KCFLAGS"
752 EXTRA_KCFLAGS="-Werror"
754 dnl # 2.6.23 to 2.6.34 API change
755 dnl # ->shrink(int nr_to_scan, gfp_t gfp_mask)
757 AC_MSG_CHECKING([whether old 2-argument shrinker exists])
758 SPL_LINUX_TRY_COMPILE([
759 #include <linux/mm.h>
761 int shrinker_cb(int nr_to_scan, gfp_t gfp_mask);
763 struct shrinker cache_shrinker = {
764 .shrink = shrinker_cb,
765 .seeks = DEFAULT_SEEKS,
767 register_shrinker(&cache_shrinker);
770 AC_DEFINE(HAVE_2ARGS_OLD_SHRINKER_CALLBACK, 1,
771 [old shrinker callback wants 2 args])
775 dnl # 2.6.35 - 2.6.39 API change
776 dnl # ->shrink(struct shrinker *,
777 dnl # int nr_to_scan, gfp_t gfp_mask)
779 AC_MSG_CHECKING([whether old 3-argument shrinker exists])
780 SPL_LINUX_TRY_COMPILE([
781 #include <linux/mm.h>
783 int shrinker_cb(struct shrinker *, int nr_to_scan,
786 struct shrinker cache_shrinker = {
787 .shrink = shrinker_cb,
788 .seeks = DEFAULT_SEEKS,
790 register_shrinker(&cache_shrinker);
793 AC_DEFINE(HAVE_3ARGS_SHRINKER_CALLBACK, 1,
794 [old shrinker callback wants 3 args])
798 dnl # 3.0 - 3.11 API change
799 dnl # ->shrink(struct shrinker *,
800 dnl # struct shrink_control *sc)
803 [whether new 2-argument shrinker exists])
804 SPL_LINUX_TRY_COMPILE([
805 #include <linux/mm.h>
807 int shrinker_cb(struct shrinker *,
808 struct shrink_control *sc);
810 struct shrinker cache_shrinker = {
811 .shrink = shrinker_cb,
812 .seeks = DEFAULT_SEEKS,
814 register_shrinker(&cache_shrinker);
817 AC_DEFINE(HAVE_2ARGS_NEW_SHRINKER_CALLBACK, 1,
818 [new shrinker callback wants 2 args])
822 dnl # 3.12 API change,
823 dnl # ->shrink() is logically split in to
824 dnl # ->count_objects() and ->scan_objects()
827 [whether ->count_objects callback exists])
828 SPL_LINUX_TRY_COMPILE([
829 #include <linux/mm.h>
831 unsigned long shrinker_cb(
833 struct shrink_control *sc);
835 struct shrinker cache_shrinker = {
836 .count_objects = shrinker_cb,
837 .scan_objects = shrinker_cb,
838 .seeks = DEFAULT_SEEKS,
840 register_shrinker(&cache_shrinker);
843 AC_DEFINE(HAVE_SPLIT_SHRINKER_CALLBACK,
844 1, [->count_objects exists])
851 EXTRA_KCFLAGS="$tmp_flags"
855 dnl # 2.6.33 API change,
856 dnl # Removed .ctl_name from struct ctl_table.
858 AC_DEFUN([SPL_AC_CTL_NAME], [
859 AC_MSG_CHECKING([whether struct ctl_table has ctl_name])
860 SPL_LINUX_TRY_COMPILE([
861 #include <linux/sysctl.h>
863 struct ctl_table ctl __attribute__ ((unused));
867 AC_DEFINE(HAVE_CTL_NAME, 1, [struct ctl_table has ctl_name])
874 dnl # 3.10 API change,
875 dnl # PDE is replaced by PDE_DATA
877 AC_DEFUN([SPL_AC_PDE_DATA], [
878 AC_MSG_CHECKING([whether PDE_DATA() is available])
879 SPL_LINUX_TRY_COMPILE_SYMBOL([
880 #include <linux/proc_fs.h>
885 AC_DEFINE(HAVE_PDE_DATA, 1, [yes])
893 dnl # set_fs_pwd takes const struct path *
895 AC_DEFUN([SPL_AC_SET_FS_PWD_WITH_CONST],
896 tmp_flags="$EXTRA_KCFLAGS"
897 EXTRA_KCFLAGS="-Werror"
898 [AC_MSG_CHECKING([whether set_fs_pwd() requires const struct path *])
899 SPL_LINUX_TRY_COMPILE([
900 #include <linux/spinlock.h>
901 #include <linux/fs_struct.h>
902 #include <linux/path.h>
903 void (*const set_fs_pwd_func)
904 (struct fs_struct *, const struct path *)
910 AC_DEFINE(HAVE_SET_FS_PWD_WITH_CONST, 1,
911 [set_fs_pwd() needs const path *])
913 SPL_LINUX_TRY_COMPILE([
914 #include <linux/spinlock.h>
915 #include <linux/fs_struct.h>
916 #include <linux/path.h>
917 void (*const set_fs_pwd_func)
918 (struct fs_struct *, struct path *)
925 AC_MSG_ERROR(unknown)
928 EXTRA_KCFLAGS="$tmp_flags"
932 dnl # 3.13 API change
933 dnl # vfs_unlink() updated to take a third delegated_inode argument.
935 AC_DEFUN([SPL_AC_2ARGS_VFS_UNLINK],
936 [AC_MSG_CHECKING([whether vfs_unlink() wants 2 args])
937 SPL_LINUX_TRY_COMPILE([
938 #include <linux/fs.h>
940 vfs_unlink((struct inode *) NULL, (struct dentry *) NULL);
943 AC_DEFINE(HAVE_2ARGS_VFS_UNLINK, 1,
944 [vfs_unlink() wants 2 args])
948 dnl # Linux 3.13 API change
949 dnl # Added delegated inode
951 AC_MSG_CHECKING([whether vfs_unlink() wants 3 args])
952 SPL_LINUX_TRY_COMPILE([
953 #include <linux/fs.h>
955 vfs_unlink((struct inode *) NULL,
956 (struct dentry *) NULL,
957 (struct inode **) NULL);
960 AC_DEFINE(HAVE_3ARGS_VFS_UNLINK, 1,
961 [vfs_unlink() wants 3 args])
970 dnl # 3.13 and 3.15 API changes
971 dnl # Added delegated inode and flags argument.
973 AC_DEFUN([SPL_AC_4ARGS_VFS_RENAME],
974 [AC_MSG_CHECKING([whether vfs_rename() wants 4 args])
975 SPL_LINUX_TRY_COMPILE([
976 #include <linux/fs.h>
978 vfs_rename((struct inode *) NULL, (struct dentry *) NULL,
979 (struct inode *) NULL, (struct dentry *) NULL);
982 AC_DEFINE(HAVE_4ARGS_VFS_RENAME, 1,
983 [vfs_rename() wants 4 args])
987 dnl # Linux 3.13 API change
988 dnl # Added delegated inode
990 AC_MSG_CHECKING([whether vfs_rename() wants 5 args])
991 SPL_LINUX_TRY_COMPILE([
992 #include <linux/fs.h>
994 vfs_rename((struct inode *) NULL,
995 (struct dentry *) NULL,
996 (struct inode *) NULL,
997 (struct dentry *) NULL,
998 (struct inode **) NULL);
1001 AC_DEFINE(HAVE_5ARGS_VFS_RENAME, 1,
1002 [vfs_rename() wants 5 args])
1006 dnl # Linux 3.15 API change
1009 AC_MSG_CHECKING([whether vfs_rename() wants 6 args])
1010 SPL_LINUX_TRY_COMPILE([
1011 #include <linux/fs.h>
1013 vfs_rename((struct inode *) NULL,
1014 (struct dentry *) NULL,
1015 (struct inode *) NULL,
1016 (struct dentry *) NULL,
1017 (struct inode **) NULL,
1021 AC_DEFINE(HAVE_6ARGS_VFS_RENAME, 1,
1022 [vfs_rename() wants 6 args])
1031 dnl # 2.6.36 API change,
1032 dnl # The 'struct fs_struct->lock' was changed from a rwlock_t to
1033 dnl # a spinlock_t to improve the fastpath performance.
1035 AC_DEFUN([SPL_AC_FS_STRUCT_SPINLOCK], [
1036 AC_MSG_CHECKING([whether struct fs_struct uses spinlock_t])
1037 tmp_flags="$EXTRA_KCFLAGS"
1038 EXTRA_KCFLAGS="-Werror"
1039 SPL_LINUX_TRY_COMPILE([
1040 #include <linux/sched.h>
1041 #include <linux/fs_struct.h>
1043 static struct fs_struct fs;
1044 spin_lock_init(&fs.lock);
1047 AC_DEFINE(HAVE_FS_STRUCT_SPINLOCK, 1,
1048 [struct fs_struct uses spinlock_t])
1052 EXTRA_KCFLAGS="$tmp_flags"
1056 dnl # User namespaces, use kuid_t in place of uid_t
1057 dnl # where available. Not strictly a user namespaces thing
1058 dnl # but it should prevent surprises
1060 AC_DEFUN([SPL_AC_KUIDGID_T], [
1061 AC_MSG_CHECKING([whether kuid_t/kgid_t is available])
1062 SPL_LINUX_TRY_COMPILE([
1063 #include <linux/uidgid.h>
1065 kuid_t userid = KUIDT_INIT(0);
1066 kgid_t groupid = KGIDT_INIT(0);
1068 SPL_LINUX_TRY_COMPILE([
1069 #include <linux/uidgid.h>
1074 AC_MSG_RESULT(yes; optional)
1076 AC_MSG_RESULT(yes; mandatory)
1077 AC_DEFINE(HAVE_KUIDGID_T, 1, [kuid_t/kgid_t in use])
1085 dnl # 2.6.39 API change,
1086 dnl # __put_task_struct() was exported by the mainline kernel.
1088 AC_DEFUN([SPL_AC_PUT_TASK_STRUCT],
1089 [AC_MSG_CHECKING([whether __put_task_struct() is available])
1090 SPL_LINUX_TRY_COMPILE_SYMBOL([
1091 #include <linux/sched.h>
1093 __put_task_struct(NULL);
1094 ], [__put_task_struct], [], [
1096 AC_DEFINE(HAVE_PUT_TASK_STRUCT, 1,
1097 [__put_task_struct() is available])
1104 dnl # 2.6.35 API change,
1105 dnl # Unused 'struct dentry *' removed from vfs_fsync() prototype.
1107 AC_DEFUN([SPL_AC_2ARGS_VFS_FSYNC], [
1108 AC_MSG_CHECKING([whether vfs_fsync() wants 2 args])
1109 SPL_LINUX_TRY_COMPILE([
1110 #include <linux/fs.h>
1115 AC_DEFINE(HAVE_2ARGS_VFS_FSYNC, 1, [vfs_fsync() wants 2 args])
1122 dnl # 3.5 API change,
1123 dnl # inode_operations.truncate_range removed
1125 AC_DEFUN([SPL_AC_INODE_TRUNCATE_RANGE], [
1126 AC_MSG_CHECKING([whether truncate_range() inode operation is available])
1127 SPL_LINUX_TRY_COMPILE([
1128 #include <linux/fs.h>
1130 struct inode_operations ops;
1131 ops.truncate_range = NULL;
1134 AC_DEFINE(HAVE_INODE_TRUNCATE_RANGE, 1,
1135 [truncate_range() inode operation is available])
1142 dnl # Linux 2.6.38 - 3.x API
1144 AC_DEFUN([SPL_AC_KERNEL_FILE_FALLOCATE], [
1145 AC_MSG_CHECKING([whether fops->fallocate() exists])
1146 SPL_LINUX_TRY_COMPILE([
1147 #include <linux/fs.h>
1149 long (*fallocate) (struct file *, int, loff_t, loff_t) = NULL;
1150 struct file_operations fops __attribute__ ((unused)) = {
1151 .fallocate = fallocate,
1155 AC_DEFINE(HAVE_FILE_FALLOCATE, 1, [fops->fallocate() exists])
1162 dnl # Linux 2.6.x - 2.6.37 API
1164 AC_DEFUN([SPL_AC_KERNEL_INODE_FALLOCATE], [
1165 AC_MSG_CHECKING([whether iops->fallocate() exists])
1166 SPL_LINUX_TRY_COMPILE([
1167 #include <linux/fs.h>
1169 long (*fallocate) (struct inode *, int, loff_t, loff_t) = NULL;
1170 struct inode_operations fops __attribute__ ((unused)) = {
1171 .fallocate = fallocate,
1175 AC_DEFINE(HAVE_INODE_FALLOCATE, 1, [fops->fallocate() exists])
1182 dnl # PaX Linux 2.6.38 - 3.x API
1184 AC_DEFUN([SPL_AC_PAX_KERNEL_FILE_FALLOCATE], [
1185 AC_MSG_CHECKING([whether fops->fallocate() exists])
1186 SPL_LINUX_TRY_COMPILE([
1187 #include <linux/fs.h>
1189 long (*fallocate) (struct file *, int, loff_t, loff_t) = NULL;
1190 struct file_operations_no_const fops __attribute__ ((unused)) = {
1191 .fallocate = fallocate,
1195 AC_DEFINE(HAVE_FILE_FALLOCATE, 1, [fops->fallocate() exists])
1202 dnl # The fallocate callback was moved from the inode_operations
1203 dnl # structure to the file_operations structure.
1205 AC_DEFUN([SPL_AC_KERNEL_FALLOCATE], [
1206 SPL_AC_KERNEL_FILE_FALLOCATE
1207 SPL_AC_KERNEL_INODE_FALLOCATE
1208 SPL_AC_PAX_KERNEL_FILE_FALLOCATE
1212 dnl # zlib inflate compat,
1213 dnl # Verify the kernel has CONFIG_ZLIB_INFLATE support enabled.
1215 AC_DEFUN([SPL_AC_CONFIG_ZLIB_INFLATE], [
1216 AC_MSG_CHECKING([whether CONFIG_ZLIB_INFLATE is defined])
1217 SPL_LINUX_TRY_COMPILE([
1218 #if !defined(CONFIG_ZLIB_INFLATE) && \
1219 !defined(CONFIG_ZLIB_INFLATE_MODULE)
1220 #error CONFIG_ZLIB_INFLATE not defined
1223 AC_MSG_RESULT([yes])
1227 *** This kernel does not include the required zlib inflate support.
1228 *** Rebuild the kernel with CONFIG_ZLIB_INFLATE=y|m set.])
1233 dnl # zlib deflate compat,
1234 dnl # Verify the kernel has CONFIG_ZLIB_DEFLATE support enabled.
1236 AC_DEFUN([SPL_AC_CONFIG_ZLIB_DEFLATE], [
1237 AC_MSG_CHECKING([whether CONFIG_ZLIB_DEFLATE is defined])
1238 SPL_LINUX_TRY_COMPILE([
1239 #if !defined(CONFIG_ZLIB_DEFLATE) && \
1240 !defined(CONFIG_ZLIB_DEFLATE_MODULE)
1241 #error CONFIG_ZLIB_DEFLATE not defined
1244 AC_MSG_RESULT([yes])
1248 *** This kernel does not include the required zlib deflate support.
1249 *** Rebuild the kernel with CONFIG_ZLIB_DEFLATE=y|m set.])
1254 dnl # config trim unused symbols,
1255 dnl # Verify the kernel has CONFIG_TRIM_UNUSED_KSYMS DISABLED.
1257 AC_DEFUN([SPL_AC_CONFIG_TRIM_UNUSED_KSYMS], [
1258 AC_MSG_CHECKING([whether CONFIG_TRIM_UNUSED_KSYM is disabled])
1259 SPL_LINUX_TRY_COMPILE([
1260 #if defined(CONFIG_TRIM_UNUSED_KSYMS)
1261 #error CONFIG_TRIM_UNUSED_KSYMS not defined
1264 AC_MSG_RESULT([yes])
1268 *** This kernel has unused symbols trimming enabled, please disable.
1269 *** Rebuild the kernel with CONFIG_TRIM_UNUSED_KSYMS=n set.])
1274 dnl # 2.6.39 API compat,
1275 dnl # The function zlib_deflate_workspacesize() now take 2 arguments.
1276 dnl # This was done to avoid always having to allocate the maximum size
1277 dnl # workspace (268K). The caller can now specific the windowBits and
1278 dnl # memLevel compression parameters to get a smaller workspace.
1280 AC_DEFUN([SPL_AC_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE],
1281 [AC_MSG_CHECKING([whether zlib_deflate_workspacesize() wants 2 args])
1282 SPL_LINUX_TRY_COMPILE([
1283 #include <linux/zlib.h>
1285 return zlib_deflate_workspacesize(MAX_WBITS, MAX_MEM_LEVEL);
1288 AC_DEFINE(HAVE_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE, 1,
1289 [zlib_deflate_workspacesize() wants 2 args])
1296 dnl # 2.6.39 API change,
1297 dnl # Shrinker adjust to use common shrink_control structure.
1299 AC_DEFUN([SPL_AC_SHRINK_CONTROL_STRUCT], [
1300 AC_MSG_CHECKING([whether struct shrink_control exists])
1301 SPL_LINUX_TRY_COMPILE([
1302 #include <linux/mm.h>
1304 struct shrink_control sc __attribute__ ((unused));
1307 sc.gfp_mask = GFP_KERNEL;
1310 AC_DEFINE(HAVE_SHRINK_CONTROL_STRUCT, 1,
1311 [struct shrink_control exists])
1318 dnl # 3.1 API Change
1320 dnl # The rw_semaphore.wait_lock member was changed from spinlock_t to
1321 dnl # raw_spinlock_t at commit ddb6c9b58a19edcfac93ac670b066c836ff729f1.
1323 AC_DEFUN([SPL_AC_RWSEM_SPINLOCK_IS_RAW], [
1324 AC_MSG_CHECKING([whether struct rw_semaphore member wait_lock is raw])
1325 tmp_flags="$EXTRA_KCFLAGS"
1326 EXTRA_KCFLAGS="-Werror"
1327 SPL_LINUX_TRY_COMPILE([
1328 #include <linux/rwsem.h>
1330 struct rw_semaphore dummy_semaphore __attribute__ ((unused));
1331 raw_spinlock_t dummy_lock __attribute__ ((unused));
1332 dummy_semaphore.wait_lock = dummy_lock;
1335 AC_DEFINE(RWSEM_SPINLOCK_IS_RAW, 1,
1336 [struct rw_semaphore member wait_lock is raw_spinlock_t])
1340 EXTRA_KCFLAGS="$tmp_flags"
1344 dnl # 3.16 API Change
1346 dnl # rwsem-spinlock "->activity" changed to "->count"
1348 AC_DEFUN([SPL_AC_RWSEM_ACTIVITY], [
1349 AC_MSG_CHECKING([whether struct rw_semaphore has member activity])
1350 tmp_flags="$EXTRA_KCFLAGS"
1351 EXTRA_KCFLAGS="-Werror"
1352 SPL_LINUX_TRY_COMPILE([
1353 #include <linux/rwsem.h>
1355 struct rw_semaphore dummy_semaphore __attribute__ ((unused));
1356 dummy_semaphore.activity = 0;
1359 AC_DEFINE(HAVE_RWSEM_ACTIVITY, 1,
1360 [struct rw_semaphore has member activity])
1364 EXTRA_KCFLAGS="$tmp_flags"
1368 dnl # 4.8 API Change
1370 dnl # rwsem "->count" changed to atomic_long_t type
1372 AC_DEFUN([SPL_AC_RWSEM_ATOMIC_LONG_COUNT], [
1374 [whether struct rw_semaphore has atomic_long_t member count])
1375 tmp_flags="$EXTRA_KCFLAGS"
1376 EXTRA_KCFLAGS="-Werror"
1377 SPL_LINUX_TRY_COMPILE([
1378 #include <linux/rwsem.h>
1380 DECLARE_RWSEM(dummy_semaphore);
1381 (void) atomic_long_read(&dummy_semaphore.count);
1384 AC_DEFINE(HAVE_RWSEM_ATOMIC_LONG_COUNT, 1,
1385 [struct rw_semaphore has atomic_long_t member count])
1389 EXTRA_KCFLAGS="$tmp_flags"
1393 dnl # 3.9 API change,
1394 dnl # Moved things from linux/sched.h to linux/sched/rt.h
1396 AC_DEFUN([SPL_AC_SCHED_RT_HEADER],
1397 [AC_MSG_CHECKING([whether header linux/sched/rt.h exists])
1398 SPL_LINUX_TRY_COMPILE([
1399 #include <linux/sched.h>
1400 #include <linux/sched/rt.h>
1404 AC_DEFINE(HAVE_SCHED_RT_HEADER, 1, [linux/sched/rt.h exists])
1412 dnl # 3.9 API change,
1413 dnl # vfs_getattr() uses 2 args
1414 dnl # It takes struct path * instead of struct vfsmount * and struct dentry *
1416 AC_DEFUN([SPL_AC_2ARGS_VFS_GETATTR], [
1417 AC_MSG_CHECKING([whether vfs_getattr() wants])
1418 SPL_LINUX_TRY_COMPILE([
1419 #include <linux/fs.h>
1421 vfs_getattr((struct path *) NULL,
1422 (struct kstat *)NULL);
1424 AC_MSG_RESULT(2 args)
1425 AC_DEFINE(HAVE_2ARGS_VFS_GETATTR, 1,
1426 [vfs_getattr wants 2 args])
1428 SPL_LINUX_TRY_COMPILE([
1429 #include <linux/fs.h>
1431 vfs_getattr((struct vfsmount *)NULL,
1432 (struct dentry *)NULL,
1433 (struct kstat *)NULL);
1435 AC_MSG_RESULT(3 args)
1437 AC_MSG_ERROR(unknown)
1443 dnl # 2.6.36 API compatibility.
1444 dnl # Added usleep_range timer.
1445 dnl # usleep_range is a finer precision implementation of msleep
1446 dnl # designed to be a drop-in replacement for udelay where a precise
1447 dnl # sleep / busy-wait is unnecessary.
1449 AC_DEFUN([SPL_AC_USLEEP_RANGE], [
1450 AC_MSG_CHECKING([whether usleep_range() is available])
1451 SPL_LINUX_TRY_COMPILE([
1452 #include <linux/delay.h>
1457 AC_DEFINE(HAVE_USLEEP_RANGE, 1,
1458 [usleep_range is available])
1465 dnl # 2.6.35 API change,
1466 dnl # The cachep->gfpflags member was renamed cachep->allocflags. These are
1467 dnl # private allocation flags which are applied when allocating a new slab
1468 dnl # in kmem_getpages(). Unfortunately there is no public API for setting
1469 dnl # non-default flags.
1471 AC_DEFUN([SPL_AC_KMEM_CACHE_ALLOCFLAGS], [
1472 AC_MSG_CHECKING([whether struct kmem_cache has allocflags])
1473 SPL_LINUX_TRY_COMPILE([
1474 #include <linux/slab.h>
1476 struct kmem_cache cachep __attribute__ ((unused));
1477 cachep.allocflags = GFP_KERNEL;
1480 AC_DEFINE(HAVE_KMEM_CACHE_ALLOCFLAGS, 1,
1481 [struct kmem_cache has allocflags])
1485 AC_MSG_CHECKING([whether struct kmem_cache has gfpflags])
1486 SPL_LINUX_TRY_COMPILE([
1487 #include <linux/slab.h>
1489 struct kmem_cache cachep __attribute__ ((unused));
1490 cachep.gfpflags = GFP_KERNEL;
1493 AC_DEFINE(HAVE_KMEM_CACHE_GFPFLAGS, 1,
1494 [struct kmem_cache has gfpflags])
1502 dnl # 3.17 API change,
1503 dnl # wait_on_bit() no longer requires an action argument. The former
1504 dnl # "wait_on_bit" interface required an 'action' function to be provided
1505 dnl # which does the actual waiting. There were over 20 such functions in the
1506 dnl # kernel, many of them identical, though most cases can be satisfied by one
1507 dnl # of just two functions: one which uses io_schedule() and one which just
1508 dnl # uses schedule(). This API change was made to consolidate all of those
1509 dnl # redundant wait functions.
1511 AC_DEFUN([SPL_AC_WAIT_ON_BIT], [
1512 AC_MSG_CHECKING([whether wait_on_bit() takes an action])
1513 SPL_LINUX_TRY_COMPILE([
1514 #include <linux/wait.h>
1516 int (*action)(void *) = NULL;
1517 wait_on_bit(NULL, 0, action, 0);
1520 AC_DEFINE(HAVE_WAIT_ON_BIT_ACTION, 1, [yes])
1527 dnl # 4.7 API change
1528 dnl # i_mutex is changed to i_rwsem. Instead of directly using
1529 dnl # i_mutex/i_rwsem, we should use inode_lock() and inode_lock_shared()
1530 dnl # We test inode_lock_shared because inode_lock is introduced earlier.
1532 AC_DEFUN([SPL_AC_INODE_LOCK], [
1533 AC_MSG_CHECKING([whether inode_lock_shared() exists])
1534 tmp_flags="$EXTRA_KCFLAGS"
1535 EXTRA_KCFLAGS="-Werror"
1536 SPL_LINUX_TRY_COMPILE([
1537 #include <linux/fs.h>
1539 struct inode *inode = NULL;
1540 inode_lock_shared(inode);
1543 AC_DEFINE(HAVE_INODE_LOCK_SHARED, 1, [yes])
1547 EXTRA_KCFLAGS="$tmp_flags"
1551 dnl # Check whether mutex has owner with task_struct type.
1553 dnl # Note that before Linux 3.0, mutex owner is of type thread_info.
1555 dnl # Note that in Linux 3.18, the condition for owner is changed from
1556 dnl # defined(CONFIG_DEBUG_MUTEXES) || defined(CONFIG_SMP) to
1557 dnl # defined(CONFIG_DEBUG_MUTEXES) || defined(CONFIG_MUTEX_SPIN_ON_OWNER)
1559 AC_DEFUN([SPL_AC_MUTEX_OWNER], [
1560 AC_MSG_CHECKING([whether mutex has owner])
1561 tmp_flags="$EXTRA_KCFLAGS"
1562 EXTRA_KCFLAGS="-Werror"
1563 SPL_LINUX_TRY_COMPILE([
1564 #include <linux/mutex.h>
1565 #include <linux/spinlock.h>
1568 struct task_struct *t __attribute__ ((unused));
1572 AC_DEFINE(HAVE_MUTEX_OWNER, 1, [yes])
1576 EXTRA_KCFLAGS="$tmp_flags"
1580 dnl # 4.9 API change
1581 dnl # group_info changed from 2d array via >blocks to 1d array via ->gid
1583 AC_DEFUN([SPL_AC_GROUP_INFO_GID], [
1584 AC_MSG_CHECKING([whether group_info->gid exists])
1585 tmp_flags="$EXTRA_KCFLAGS"
1586 EXTRA_KCFLAGS="-Werror"
1587 SPL_LINUX_TRY_COMPILE([
1588 #include <linux/cred.h>
1590 struct group_info *gi = groups_alloc(1);
1591 gi->gid[0] = KGIDT_INIT(0);
1594 AC_DEFINE(HAVE_GROUP_INFO_GID, 1, [group_info->gid exists])
1598 EXTRA_KCFLAGS="$tmp_flags"