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="$KERNELCPPFLAGS -Wstrict-prototypes"
18 AC_SUBST(KERNELCPPFLAGS)
22 SPL_AC_DEBUG_KMEM_TRACKING
24 SPL_AC_ATOMIC_SPINLOCK
25 SPL_AC_SHRINKER_CALLBACK
28 SPL_AC_SET_FS_PWD_WITH_CONST
29 SPL_AC_2ARGS_VFS_UNLINK
30 SPL_AC_4ARGS_VFS_RENAME
31 SPL_AC_2ARGS_VFS_FSYNC
32 SPL_AC_INODE_TRUNCATE_RANGE
33 SPL_AC_FS_STRUCT_SPINLOCK
35 SPL_AC_PUT_TASK_STRUCT
36 SPL_AC_KERNEL_FALLOCATE
37 SPL_AC_CONFIG_ZLIB_INFLATE
38 SPL_AC_CONFIG_ZLIB_DEFLATE
39 SPL_AC_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE
40 SPL_AC_SHRINK_CONTROL_STRUCT
41 SPL_AC_RWSEM_SPINLOCK_IS_RAW
42 SPL_AC_SCHED_RT_HEADER
43 SPL_AC_2ARGS_VFS_GETATTR
45 SPL_AC_KMEM_CACHE_ALLOCFLAGS
49 AC_DEFUN([SPL_AC_MODULE_SYMVERS], [
50 modpost=$LINUX/scripts/Makefile.modpost
51 AC_MSG_CHECKING([kernel file name for module symbols])
52 if test "x$enable_linux_builtin" != xyes -a -f "$modpost"; then
53 if grep -q Modules.symvers $modpost; then
54 LINUX_SYMBOLS=Modules.symvers
56 LINUX_SYMBOLS=Module.symvers
59 if ! test -f "$LINUX_OBJ/$LINUX_SYMBOLS"; then
61 *** Please make sure the kernel devel package for your distribution
62 *** is installed. If you are building with a custom kernel, make sure the
63 *** kernel is configured, built, and the '--with-linux=PATH' configure
64 *** option refers to the location of the kernel source.])
69 AC_MSG_RESULT($LINUX_SYMBOLS)
70 AC_SUBST(LINUX_SYMBOLS)
73 AC_DEFUN([SPL_AC_KERNEL], [
75 AS_HELP_STRING([--with-linux=PATH],
76 [Path to kernel source]),
77 [kernelsrc="$withval"])
79 AC_ARG_WITH([linux-obj],
80 AS_HELP_STRING([--with-linux-obj=PATH],
81 [Path to kernel build objects]),
82 [kernelbuild="$withval"])
84 AC_MSG_CHECKING([kernel source directory])
85 if test -z "$kernelsrc"; then
86 if test -e "/lib/modules/$(uname -r)/source"; then
87 headersdir="/lib/modules/$(uname -r)/source"
88 sourcelink=$(readlink -f "$headersdir")
89 elif test -e "/lib/modules/$(uname -r)/build"; then
90 headersdir="/lib/modules/$(uname -r)/build"
91 sourcelink=$(readlink -f "$headersdir")
93 sourcelink=$(ls -1d /usr/src/kernels/* \
95 2>/dev/null | grep -v obj | tail -1)
98 if test -n "$sourcelink" && test -e ${sourcelink}; then
99 kernelsrc=`readlink -f ${sourcelink}`
101 kernelsrc="[Not found]"
104 if test "$kernelsrc" = "NONE"; then
109 AC_MSG_RESULT([$kernelsrc])
110 if test ! -d "$kernelsrc"; then
112 *** Please make sure the kernel devel package for your distribution
113 *** is installed and then try again. If that fails, you can specify the
114 *** location of the kernel source with the '--with-linux=PATH' option.])
117 AC_MSG_CHECKING([kernel build directory])
118 if test -z "$kernelbuild"; then
119 if test -e "/lib/modules/$(uname -r)/build"; then
120 kernelbuild=`readlink -f /lib/modules/$(uname -r)/build`
121 elif test -d ${kernelsrc}-obj/${target_cpu}/${target_cpu}; then
122 kernelbuild=${kernelsrc}-obj/${target_cpu}/${target_cpu}
123 elif test -d ${kernelsrc}-obj/${target_cpu}/default; then
124 kernelbuild=${kernelsrc}-obj/${target_cpu}/default
125 elif test -d `dirname ${kernelsrc}`/build-${target_cpu}; then
126 kernelbuild=`dirname ${kernelsrc}`/build-${target_cpu}
128 kernelbuild=${kernelsrc}
131 AC_MSG_RESULT([$kernelbuild])
133 AC_MSG_CHECKING([kernel source version])
134 utsrelease1=$kernelbuild/include/linux/version.h
135 utsrelease2=$kernelbuild/include/linux/utsrelease.h
136 utsrelease3=$kernelbuild/include/generated/utsrelease.h
137 if test -r $utsrelease1 && fgrep -q UTS_RELEASE $utsrelease1; then
138 utsrelease=linux/version.h
139 elif test -r $utsrelease2 && fgrep -q UTS_RELEASE $utsrelease2; then
140 utsrelease=linux/utsrelease.h
141 elif test -r $utsrelease3 && fgrep -q UTS_RELEASE $utsrelease3; then
142 utsrelease=generated/utsrelease.h
145 if test "$utsrelease"; then
146 kernsrcver=`(echo "#include <$utsrelease>";
147 echo "kernsrcver=UTS_RELEASE") |
148 cpp -I $kernelbuild/include |
149 grep "^kernsrcver=" | cut -d \" -f 2`
151 if test -z "$kernsrcver"; then
152 AC_MSG_RESULT([Not found])
153 AC_MSG_ERROR([*** Cannot determine kernel version.])
156 AC_MSG_RESULT([Not found])
157 if test "x$enable_linux_builtin" != xyes; then
158 AC_MSG_ERROR([*** Cannot find UTS_RELEASE definition.])
161 *** Cannot find UTS_RELEASE definition.
162 *** Please run 'make prepare' inside the kernel source tree.])
166 AC_MSG_RESULT([$kernsrcver])
169 LINUX_OBJ=${kernelbuild}
170 LINUX_VERSION=${kernsrcver}
174 AC_SUBST(LINUX_VERSION)
176 SPL_AC_MODULE_SYMVERS
180 dnl # Default SPL user configuration
182 AC_DEFUN([SPL_AC_CONFIG_USER], [])
185 dnl # Check for rpm+rpmbuild to build RPM packages. If these tools
186 dnl # are missing, it is non-fatal, but you will not be able to build
187 dnl # RPM packages and will be warned if you try too.
189 dnl # By default, the generic spec file will be used because it requires
190 dnl # minimal dependencies. Distribution specific spec files can be
191 dnl # placed under the 'rpm/<distribution>' directory and enabled using
192 dnl # the --with-spec=<distribution> configure option.
194 AC_DEFUN([SPL_AC_RPM], [
198 AC_MSG_CHECKING([whether $RPM is available])
199 AS_IF([tmp=$($RPM --version 2>/dev/null)], [
200 RPM_VERSION=$(echo $tmp | $AWK '/RPM/ { print $[3] }')
202 AC_MSG_RESULT([$HAVE_RPM ($RPM_VERSION)])
205 AC_MSG_RESULT([$HAVE_RPM])
208 AC_MSG_CHECKING([whether $RPMBUILD is available])
209 AS_IF([tmp=$($RPMBUILD --version 2>/dev/null)], [
210 RPMBUILD_VERSION=$(echo $tmp | $AWK '/RPM/ { print $[3] }')
212 AC_MSG_RESULT([$HAVE_RPMBUILD ($RPMBUILD_VERSION)])
215 AC_MSG_RESULT([$HAVE_RPMBUILD])
218 RPM_DEFINE_COMMON='--define "$(DEBUG_SPL) 1" --define "$(DEBUG_KMEM) 1" --define "$(DEBUG_KMEM_TRACKING) 1"'
220 RPM_DEFINE_KMOD='--define "kernels $(LINUX_VERSION)"'
223 SRPM_DEFINE_COMMON='--define "build_src_rpm 1"'
228 RPM_SPEC_DIR="rpm/generic"
230 AS_HELP_STRING([--with-spec=SPEC],
231 [Spec files 'generic|redhat']),
232 [RPM_SPEC_DIR="rpm/$withval"])
234 AC_MSG_CHECKING([whether spec files are available])
235 AC_MSG_RESULT([yes ($RPM_SPEC_DIR/*.spec.in)])
239 AC_SUBST(RPM_VERSION)
241 AC_SUBST(HAVE_RPMBUILD)
243 AC_SUBST(RPMBUILD_VERSION)
245 AC_SUBST(RPM_SPEC_DIR)
246 AC_SUBST(RPM_DEFINE_UTIL)
247 AC_SUBST(RPM_DEFINE_KMOD)
248 AC_SUBST(RPM_DEFINE_DKMS)
249 AC_SUBST(RPM_DEFINE_COMMON)
250 AC_SUBST(SRPM_DEFINE_UTIL)
251 AC_SUBST(SRPM_DEFINE_KMOD)
252 AC_SUBST(SRPM_DEFINE_DKMS)
253 AC_SUBST(SRPM_DEFINE_COMMON)
257 dnl # Check for dpkg+dpkg-buildpackage to build DEB packages. If these
258 dnl # tools are missing it is non-fatal but you will not be able to build
259 dnl # DEB packages and will be warned if you try too.
261 AC_DEFUN([SPL_AC_DPKG], [
263 DPKGBUILD=dpkg-buildpackage
265 AC_MSG_CHECKING([whether $DPKG is available])
266 AS_IF([tmp=$($DPKG --version 2>/dev/null)], [
267 DPKG_VERSION=$(echo $tmp | $AWK '/Debian/ { print $[7] }')
269 AC_MSG_RESULT([$HAVE_DPKG ($DPKG_VERSION)])
272 AC_MSG_RESULT([$HAVE_DPKG])
275 AC_MSG_CHECKING([whether $DPKGBUILD is available])
276 AS_IF([tmp=$($DPKGBUILD --version 2>/dev/null)], [
277 DPKGBUILD_VERSION=$(echo $tmp | \
278 $AWK '/Debian/ { print $[4] }' | cut -f-4 -d'.')
280 AC_MSG_RESULT([$HAVE_DPKGBUILD ($DPKGBUILD_VERSION)])
283 AC_MSG_RESULT([$HAVE_DPKGBUILD])
288 AC_SUBST(DPKG_VERSION)
290 AC_SUBST(HAVE_DPKGBUILD)
292 AC_SUBST(DPKGBUILD_VERSION)
296 dnl # Until native packaging for various different packing systems
297 dnl # can be added the least we can do is attempt to use alien to
298 dnl # convert the RPM packages to the needed package type. This is
299 dnl # a hack but so far it has worked reasonable well.
301 AC_DEFUN([SPL_AC_ALIEN], [
304 AC_MSG_CHECKING([whether $ALIEN is available])
305 AS_IF([tmp=$($ALIEN --version 2>/dev/null)], [
306 ALIEN_VERSION=$(echo $tmp | $AWK '{ print $[3] }')
308 AC_MSG_RESULT([$HAVE_ALIEN ($ALIEN_VERSION)])
311 AC_MSG_RESULT([$HAVE_ALIEN])
316 AC_SUBST(ALIEN_VERSION)
320 dnl # Using the VENDOR tag from config.guess set the default
321 dnl # package type for 'make pkg': (rpm | deb | tgz)
323 AC_DEFUN([SPL_AC_DEFAULT_PACKAGE], [
324 AC_MSG_CHECKING([linux distribution])
325 if test -f /etc/toss-release ; then
327 elif test -f /etc/fedora-release ; then
329 elif test -f /etc/redhat-release ; then
331 elif test -f /etc/gentoo-release ; then
333 elif test -f /etc/arch-release ; then
335 elif test -f /etc/SuSE-release ; then
337 elif test -f /etc/slackware-version ; then
339 elif test -f /etc/lunar.release ; then
341 elif test -f /etc/lsb-release ; then
343 elif test -f /etc/debian_version ; then
348 AC_MSG_RESULT([$VENDOR])
351 AC_MSG_CHECKING([default package type])
353 toss) DEFAULT_PACKAGE=rpm ;;
354 redhat) DEFAULT_PACKAGE=rpm ;;
355 fedora) DEFAULT_PACKAGE=rpm ;;
356 gentoo) DEFAULT_PACKAGE=tgz ;;
357 arch) DEFAULT_PACKAGE=tgz ;;
358 sles) DEFAULT_PACKAGE=rpm ;;
359 slackware) DEFAULT_PACKAGE=tgz ;;
360 lunar) DEFAULT_PACKAGE=tgz ;;
361 ubuntu) DEFAULT_PACKAGE=deb ;;
362 debian) DEFAULT_PACKAGE=deb ;;
363 *) DEFAULT_PACKAGE=rpm ;;
366 AC_MSG_RESULT([$DEFAULT_PACKAGE])
367 AC_SUBST(DEFAULT_PACKAGE)
371 dnl # Default SPL user configuration
373 AC_DEFUN([SPL_AC_PACKAGE], [
374 SPL_AC_DEFAULT_PACKAGE
380 AC_DEFUN([SPL_AC_LICENSE], [
381 AC_MSG_CHECKING([spl author])
382 AC_MSG_RESULT([$SPL_META_AUTHOR])
384 AC_MSG_CHECKING([spl license])
385 AC_MSG_RESULT([$SPL_META_LICENSE])
388 AC_DEFUN([SPL_AC_CONFIG], [
390 AC_ARG_WITH([config],
391 AS_HELP_STRING([--with-config=CONFIG],
392 [Config file 'kernel|user|all|srpm']),
393 [SPL_CONFIG="$withval"])
394 AC_ARG_ENABLE([linux-builtin],
395 [AC_HELP_STRING([--enable-linux-builtin],
396 [Configure for builtin in-tree kernel modules @<:@default=no@:>@])],
398 [enable_linux_builtin=no])
400 AC_MSG_CHECKING([spl config])
401 AC_MSG_RESULT([$SPL_CONFIG]);
404 case "$SPL_CONFIG" in
405 kernel) SPL_AC_CONFIG_KERNEL ;;
406 user) SPL_AC_CONFIG_USER ;;
407 all) SPL_AC_CONFIG_KERNEL
408 SPL_AC_CONFIG_USER ;;
411 AC_MSG_RESULT([Error!])
412 AC_MSG_ERROR([Bad value "$SPL_CONFIG" for --with-config,
413 user kernel|user|all|srpm]) ;;
416 AM_CONDITIONAL([CONFIG_USER],
417 [test "$SPL_CONFIG" = user -o "$SPL_CONFIG" = all])
418 AM_CONDITIONAL([CONFIG_KERNEL],
419 [test "$SPL_CONFIG" = kernel -o "$SPL_CONFIG" = all] &&
420 [test "x$enable_linux_builtin" != xyes ])
424 dnl # Enable if the SPL should be compiled with internal debugging enabled.
425 dnl # By default this support is disabled.
427 AC_DEFUN([SPL_AC_DEBUG], [
428 AC_MSG_CHECKING([whether debugging is enabled])
429 AC_ARG_ENABLE([debug],
430 [AS_HELP_STRING([--enable-debug],
431 [Enable generic debug support @<:@default=no@:>@])],
435 AS_IF([test "x$enable_debug" = xyes],
437 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG -Werror"
438 DEBUG_CFLAGS="-DDEBUG -Werror"
439 DEBUG_SPL="_with_debug"
441 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DNDEBUG"
442 DEBUG_CFLAGS="-DNDEBUG"
443 DEBUG_SPL="_without_debug"
446 AC_SUBST(DEBUG_CFLAGS)
448 AC_MSG_RESULT([$enable_debug])
452 dnl # Enabled by default it provides a minimal level of memory tracking.
453 dnl # A total count of bytes allocated is kept for each alloc and free.
454 dnl # Then at module unload time a report to the console will be printed
455 dnl # if memory was leaked.
457 AC_DEFUN([SPL_AC_DEBUG_KMEM], [
458 AC_ARG_ENABLE([debug-kmem],
459 [AS_HELP_STRING([--enable-debug-kmem],
460 [Enable basic kmem accounting @<:@default=no@:>@])],
462 [enable_debug_kmem=no])
464 AS_IF([test "x$enable_debug_kmem" = xyes],
466 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_KMEM"
467 DEBUG_KMEM="_with_debug_kmem"
468 AC_DEFINE([DEBUG_KMEM], [1],
469 [Define to 1 to enable basic kmem accounting])
471 DEBUG_KMEM="_without_debug_kmem"
475 AC_MSG_CHECKING([whether basic kmem accounting is enabled])
476 AC_MSG_RESULT([$enable_debug_kmem])
480 dnl # Disabled by default it provides detailed memory tracking. This
481 dnl # feature also requires --enable-debug-kmem to be set. When enabled
482 dnl # not only will total bytes be tracked but also the location of every
483 dnl # alloc and free. When the SPL module is unloaded a list of all leaked
484 dnl # addresses and where they were allocated will be dumped to the console.
485 dnl # Enabling this feature has a significant impact on performance but it
486 dnl # makes finding memory leaks pretty straight forward.
488 AC_DEFUN([SPL_AC_DEBUG_KMEM_TRACKING], [
489 AC_ARG_ENABLE([debug-kmem-tracking],
490 [AS_HELP_STRING([--enable-debug-kmem-tracking],
491 [Enable detailed kmem tracking @<:@default=no@:>@])],
493 [enable_debug_kmem_tracking=no])
495 AS_IF([test "x$enable_debug_kmem_tracking" = xyes],
497 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_KMEM_TRACKING"
498 DEBUG_KMEM_TRACKING="_with_debug_kmem_tracking"
499 AC_DEFINE([DEBUG_KMEM_TRACKING], [1],
500 [Define to 1 to enable detailed kmem tracking])
502 DEBUG_KMEM_TRACKING="_without_debug_kmem_tracking"
505 AC_SUBST(DEBUG_KMEM_TRACKING)
506 AC_MSG_CHECKING([whether detailed kmem tracking is enabled])
507 AC_MSG_RESULT([$enable_debug_kmem_tracking])
511 dnl # SPL_LINUX_CONFTEST
513 AC_DEFUN([SPL_LINUX_CONFTEST], [
514 cat confdefs.h - <<_ACEOF >conftest.c
520 dnl # SPL_LANG_PROGRAM(C)([PROLOGUE], [BODY])
522 m4_define([SPL_LANG_PROGRAM], [
527 dnl Do *not* indent the following line: there may be CPP directives.
528 dnl Don't move the `;' right after for the same reason.
536 dnl # SPL_LINUX_COMPILE_IFELSE / like AC_COMPILE_IFELSE
538 AC_DEFUN([SPL_LINUX_COMPILE_IFELSE], [
539 m4_ifvaln([$1], [SPL_LINUX_CONFTEST([$1])])
540 rm -Rf build && mkdir -p build && touch build/conftest.mod.c
541 echo "obj-m := conftest.o" >build/Makefile
543 test "x$enable_linux_builtin" = xyes && modpost_flag='modpost=true' # fake modpost stage
545 [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])],
547 [_AC_MSG_LOG_CONFTEST m4_ifvaln([$5],[$5])]
553 dnl # SPL_LINUX_TRY_COMPILE like AC_TRY_COMPILE
555 AC_DEFUN([SPL_LINUX_TRY_COMPILE],
556 [SPL_LINUX_COMPILE_IFELSE(
557 [AC_LANG_SOURCE([SPL_LANG_PROGRAM([[$1]], [[$2]])])],
559 [test -s build/conftest.o],
564 dnl # SPL_CHECK_SYMBOL_EXPORT
565 dnl # check symbol exported or not
567 AC_DEFUN([SPL_CHECK_SYMBOL_EXPORT], [
568 grep -q -E '[[[:space:]]]$1[[[:space:]]]' \
569 $LINUX_OBJ/Module*.symvers 2>/dev/null
571 if test $rc -ne 0; then
574 grep -q -E "EXPORT_SYMBOL.*($1)" \
575 "$LINUX_OBJ/$file" 2>/dev/null
577 if test $rc -eq 0; then
582 if test $export -eq 0; then :
593 dnl # SPL_LINUX_TRY_COMPILE_SYMBOL
594 dnl # like SPL_LINUX_TRY_COMPILE, except SPL_CHECK_SYMBOL_EXPORT
595 dnl # is called if not compiling for builtin
597 AC_DEFUN([SPL_LINUX_TRY_COMPILE_SYMBOL], [
598 SPL_LINUX_TRY_COMPILE([$1], [$2], [rc=0], [rc=1])
599 if test $rc -ne 0; then :
602 if test "x$enable_linux_builtin" != xyes; then
603 SPL_CHECK_SYMBOL_EXPORT([$3], [$4], [rc=0], [rc=1])
605 if test $rc -ne 0; then :
614 dnl # SPL_CHECK_SYMBOL_HEADER
615 dnl # check if a symbol prototype is defined in listed headers.
617 AC_DEFUN([SPL_CHECK_SYMBOL_HEADER], [
618 AC_MSG_CHECKING([whether symbol $1 exists in header])
621 grep -q "$2" "$LINUX/$file" 2>/dev/null
623 if test $rc -eq 0; then
628 if test $header -eq 0; then
638 dnl # SPL_CHECK_HEADER
639 dnl # check whether header exists and define HAVE_$2_HEADER
641 AC_DEFUN([SPL_CHECK_HEADER],
642 [AC_MSG_CHECKING([whether header $1 exists])
643 SPL_LINUX_TRY_COMPILE([
648 AC_DEFINE(HAVE_$2_HEADER, 1, [$1 exists])
658 dnl # Basic toolchain sanity check. Verify that kernel modules can
659 dnl # be built and which symbols can be used.
661 AC_DEFUN([SPL_AC_TEST_MODULE],
662 [AC_MSG_CHECKING([whether modules can be built])
663 SPL_LINUX_TRY_COMPILE([],[],[
667 if test "x$enable_linux_builtin" != xyes; then
668 AC_MSG_ERROR([*** Unable to build an empty module.])
671 *** Unable to build an empty module.
672 *** Please run 'make scripts' inside the kernel source tree.])
678 #include "$LINUX/include/linux/license.h"
680 return !license_is_gpl_compatible("$SPL_META_LICENSE");
683 AC_DEFINE([SPL_IS_GPL_COMPATIBLE], [1],
684 [Define to 1 if GPL-only symbols can be used])
690 dnl # Use the atomic implemenation based on global spinlocks. This
691 dnl # should only be needed by 32-bit kernels which do not provide
692 dnl # the atomic64_* API. It may be optionally enabled as a fallback
693 dnl # if problems are observed with the direct mapping to the native
694 dnl # Linux atomic operations. You may not disable atomic spinlocks
695 dnl # if you kernel does not an atomic64_* API.
697 AC_DEFUN([SPL_AC_ATOMIC_SPINLOCK], [
698 AC_ARG_ENABLE([atomic-spinlocks],
699 [AS_HELP_STRING([--enable-atomic-spinlocks],
700 [Atomic types use spinlocks @<:@default=check@:>@])],
702 [enable_atomic_spinlocks=check])
704 SPL_LINUX_TRY_COMPILE([
705 #include <linux/fs.h>
707 atomic64_t *ptr __attribute__ ((unused));
710 AC_DEFINE(HAVE_ATOMIC64_T, 1,
711 [kernel defines atomic64_t])
716 AS_IF([test "x$enable_atomic_spinlocks" = xcheck], [
717 AS_IF([test "x$have_atomic64_t" = xyes], [
718 enable_atomic_spinlocks=no
720 enable_atomic_spinlocks=yes
724 AS_IF([test "x$enable_atomic_spinlocks" = xyes], [
725 AC_DEFINE([ATOMIC_SPINLOCK], [1],
726 [Atomic types use spinlocks])
728 AS_IF([test "x$have_atomic64_t" = xno], [
730 [--disable-atomic-spinlocks given but required atomic64 support is unavailable])
734 AC_MSG_CHECKING([whether atomic types use spinlocks])
735 AC_MSG_RESULT([$enable_atomic_spinlocks])
737 AC_MSG_CHECKING([whether kernel defines atomic64_t])
738 AC_MSG_RESULT([$have_atomic64_t])
741 AC_DEFUN([SPL_AC_SHRINKER_CALLBACK],[
742 tmp_flags="$EXTRA_KCFLAGS"
743 EXTRA_KCFLAGS="-Werror"
745 dnl # 2.6.23 to 2.6.34 API change
746 dnl # ->shrink(int nr_to_scan, gfp_t gfp_mask)
748 AC_MSG_CHECKING([whether old 2-argument shrinker exists])
749 SPL_LINUX_TRY_COMPILE([
750 #include <linux/mm.h>
752 int shrinker_cb(int nr_to_scan, gfp_t gfp_mask);
754 struct shrinker cache_shrinker = {
755 .shrink = shrinker_cb,
756 .seeks = DEFAULT_SEEKS,
758 register_shrinker(&cache_shrinker);
761 AC_DEFINE(HAVE_2ARGS_OLD_SHRINKER_CALLBACK, 1,
762 [old shrinker callback wants 2 args])
766 dnl # 2.6.35 - 2.6.39 API change
767 dnl # ->shrink(struct shrinker *,
768 dnl # int nr_to_scan, gfp_t gfp_mask)
770 AC_MSG_CHECKING([whether old 3-argument shrinker exists])
771 SPL_LINUX_TRY_COMPILE([
772 #include <linux/mm.h>
774 int shrinker_cb(struct shrinker *, int nr_to_scan,
777 struct shrinker cache_shrinker = {
778 .shrink = shrinker_cb,
779 .seeks = DEFAULT_SEEKS,
781 register_shrinker(&cache_shrinker);
784 AC_DEFINE(HAVE_3ARGS_SHRINKER_CALLBACK, 1,
785 [old shrinker callback wants 3 args])
789 dnl # 3.0 - 3.11 API change
790 dnl # ->shrink(struct shrinker *,
791 dnl # struct shrink_control *sc)
794 [whether new 2-argument shrinker exists])
795 SPL_LINUX_TRY_COMPILE([
796 #include <linux/mm.h>
798 int shrinker_cb(struct shrinker *,
799 struct shrink_control *sc);
801 struct shrinker cache_shrinker = {
802 .shrink = shrinker_cb,
803 .seeks = DEFAULT_SEEKS,
805 register_shrinker(&cache_shrinker);
808 AC_DEFINE(HAVE_2ARGS_NEW_SHRINKER_CALLBACK, 1,
809 [new shrinker callback wants 2 args])
813 dnl # 3.12 API change,
814 dnl # ->shrink() is logically split in to
815 dnl # ->count_objects() and ->scan_objects()
818 [whether ->count_objects callback exists])
819 SPL_LINUX_TRY_COMPILE([
820 #include <linux/mm.h>
822 unsigned long shrinker_cb(
824 struct shrink_control *sc);
826 struct shrinker cache_shrinker = {
827 .count_objects = shrinker_cb,
828 .scan_objects = shrinker_cb,
829 .seeks = DEFAULT_SEEKS,
831 register_shrinker(&cache_shrinker);
834 AC_DEFINE(HAVE_SPLIT_SHRINKER_CALLBACK,
835 1, [->count_objects exists])
842 EXTRA_KCFLAGS="$tmp_flags"
846 dnl # 2.6.33 API change,
847 dnl # Removed .ctl_name from struct ctl_table.
849 AC_DEFUN([SPL_AC_CTL_NAME], [
850 AC_MSG_CHECKING([whether struct ctl_table has ctl_name])
851 SPL_LINUX_TRY_COMPILE([
852 #include <linux/sysctl.h>
854 struct ctl_table ctl __attribute__ ((unused));
858 AC_DEFINE(HAVE_CTL_NAME, 1, [struct ctl_table has ctl_name])
865 dnl # 3.10 API change,
866 dnl # PDE is replaced by PDE_DATA
868 AC_DEFUN([SPL_AC_PDE_DATA], [
869 AC_MSG_CHECKING([whether PDE_DATA() is available])
870 SPL_LINUX_TRY_COMPILE_SYMBOL([
871 #include <linux/proc_fs.h>
876 AC_DEFINE(HAVE_PDE_DATA, 1, [yes])
884 dnl # set_fs_pwd takes const struct path *
886 AC_DEFUN([SPL_AC_SET_FS_PWD_WITH_CONST],
887 tmp_flags="$EXTRA_KCFLAGS"
888 EXTRA_KCFLAGS="-Werror"
889 [AC_MSG_CHECKING([whether set_fs_pwd() requires const struct path *])
890 SPL_LINUX_TRY_COMPILE([
891 #include <linux/spinlock.h>
892 #include <linux/fs_struct.h>
893 #include <linux/path.h>
894 void (*const set_fs_pwd_func)
895 (struct fs_struct *, const struct path *)
901 AC_DEFINE(HAVE_SET_FS_PWD_WITH_CONST, 1,
902 [set_fs_pwd() needs const path *])
904 SPL_LINUX_TRY_COMPILE([
905 #include <linux/spinlock.h>
906 #include <linux/fs_struct.h>
907 #include <linux/path.h>
908 void (*const set_fs_pwd_func)
909 (struct fs_struct *, struct path *)
916 AC_MSG_ERROR(unknown)
919 EXTRA_KCFLAGS="$tmp_flags"
923 dnl # 3.13 API change
924 dnl # vfs_unlink() updated to take a third delegated_inode argument.
926 AC_DEFUN([SPL_AC_2ARGS_VFS_UNLINK],
927 [AC_MSG_CHECKING([whether vfs_unlink() wants 2 args])
928 SPL_LINUX_TRY_COMPILE([
929 #include <linux/fs.h>
931 vfs_unlink((struct inode *) NULL, (struct dentry *) NULL);
934 AC_DEFINE(HAVE_2ARGS_VFS_UNLINK, 1,
935 [vfs_unlink() wants 2 args])
939 dnl # Linux 3.13 API change
940 dnl # Added delegated inode
942 AC_MSG_CHECKING([whether vfs_unlink() wants 3 args])
943 SPL_LINUX_TRY_COMPILE([
944 #include <linux/fs.h>
946 vfs_unlink((struct inode *) NULL,
947 (struct dentry *) NULL,
948 (struct inode **) NULL);
951 AC_DEFINE(HAVE_3ARGS_VFS_UNLINK, 1,
952 [vfs_unlink() wants 3 args])
961 dnl # 3.13 and 3.15 API changes
962 dnl # Added delegated inode and flags argument.
964 AC_DEFUN([SPL_AC_4ARGS_VFS_RENAME],
965 [AC_MSG_CHECKING([whether vfs_rename() wants 4 args])
966 SPL_LINUX_TRY_COMPILE([
967 #include <linux/fs.h>
969 vfs_rename((struct inode *) NULL, (struct dentry *) NULL,
970 (struct inode *) NULL, (struct dentry *) NULL);
973 AC_DEFINE(HAVE_4ARGS_VFS_RENAME, 1,
974 [vfs_rename() wants 4 args])
978 dnl # Linux 3.13 API change
979 dnl # Added delegated inode
981 AC_MSG_CHECKING([whether vfs_rename() wants 5 args])
982 SPL_LINUX_TRY_COMPILE([
983 #include <linux/fs.h>
985 vfs_rename((struct inode *) NULL,
986 (struct dentry *) NULL,
987 (struct inode *) NULL,
988 (struct dentry *) NULL,
989 (struct inode **) NULL);
992 AC_DEFINE(HAVE_5ARGS_VFS_RENAME, 1,
993 [vfs_rename() wants 5 args])
997 dnl # Linux 3.15 API change
1000 AC_MSG_CHECKING([whether vfs_rename() wants 6 args])
1001 SPL_LINUX_TRY_COMPILE([
1002 #include <linux/fs.h>
1004 vfs_rename((struct inode *) NULL,
1005 (struct dentry *) NULL,
1006 (struct inode *) NULL,
1007 (struct dentry *) NULL,
1008 (struct inode **) NULL,
1012 AC_DEFINE(HAVE_6ARGS_VFS_RENAME, 1,
1013 [vfs_rename() wants 6 args])
1022 dnl # 2.6.36 API change,
1023 dnl # The 'struct fs_struct->lock' was changed from a rwlock_t to
1024 dnl # a spinlock_t to improve the fastpath performance.
1026 AC_DEFUN([SPL_AC_FS_STRUCT_SPINLOCK], [
1027 AC_MSG_CHECKING([whether struct fs_struct uses spinlock_t])
1028 tmp_flags="$EXTRA_KCFLAGS"
1029 EXTRA_KCFLAGS="-Werror"
1030 SPL_LINUX_TRY_COMPILE([
1031 #include <linux/sched.h>
1032 #include <linux/fs_struct.h>
1034 static struct fs_struct fs;
1035 spin_lock_init(&fs.lock);
1038 AC_DEFINE(HAVE_FS_STRUCT_SPINLOCK, 1,
1039 [struct fs_struct uses spinlock_t])
1043 EXTRA_KCFLAGS="$tmp_flags"
1047 dnl # User namespaces, use kuid_t in place of uid_t
1048 dnl # where available. Not strictly a user namespaces thing
1049 dnl # but it should prevent surprises
1051 AC_DEFUN([SPL_AC_KUIDGID_T], [
1052 AC_MSG_CHECKING([whether kuid_t/kgid_t is available])
1053 SPL_LINUX_TRY_COMPILE([
1054 #include <linux/uidgid.h>
1056 kuid_t userid = KUIDT_INIT(0);
1057 kgid_t groupid = KGIDT_INIT(0);
1059 SPL_LINUX_TRY_COMPILE([
1060 #include <linux/uidgid.h>
1065 AC_MSG_RESULT(yes; optional)
1067 AC_MSG_RESULT(yes; mandatory)
1068 AC_DEFINE(HAVE_KUIDGID_T, 1, [kuid_t/kgid_t in use])
1076 dnl # 2.6.39 API change,
1077 dnl # __put_task_struct() was exported by the mainline kernel.
1079 AC_DEFUN([SPL_AC_PUT_TASK_STRUCT],
1080 [AC_MSG_CHECKING([whether __put_task_struct() is available])
1081 SPL_LINUX_TRY_COMPILE_SYMBOL([
1082 #include <linux/sched.h>
1084 __put_task_struct(NULL);
1085 ], [__put_task_struct], [], [
1087 AC_DEFINE(HAVE_PUT_TASK_STRUCT, 1,
1088 [__put_task_struct() is available])
1095 dnl # 2.6.35 API change,
1096 dnl # Unused 'struct dentry *' removed from vfs_fsync() prototype.
1098 AC_DEFUN([SPL_AC_2ARGS_VFS_FSYNC], [
1099 AC_MSG_CHECKING([whether vfs_fsync() wants 2 args])
1100 SPL_LINUX_TRY_COMPILE([
1101 #include <linux/fs.h>
1106 AC_DEFINE(HAVE_2ARGS_VFS_FSYNC, 1, [vfs_fsync() wants 2 args])
1113 dnl # 3.5 API change,
1114 dnl # inode_operations.truncate_range removed
1116 AC_DEFUN([SPL_AC_INODE_TRUNCATE_RANGE], [
1117 AC_MSG_CHECKING([whether truncate_range() inode operation is available])
1118 SPL_LINUX_TRY_COMPILE([
1119 #include <linux/fs.h>
1121 struct inode_operations ops;
1122 ops.truncate_range = NULL;
1125 AC_DEFINE(HAVE_INODE_TRUNCATE_RANGE, 1,
1126 [truncate_range() inode operation is available])
1133 dnl # Linux 2.6.38 - 3.x API
1135 AC_DEFUN([SPL_AC_KERNEL_FILE_FALLOCATE], [
1136 AC_MSG_CHECKING([whether fops->fallocate() exists])
1137 SPL_LINUX_TRY_COMPILE([
1138 #include <linux/fs.h>
1140 long (*fallocate) (struct file *, int, loff_t, loff_t) = NULL;
1141 struct file_operations fops __attribute__ ((unused)) = {
1142 .fallocate = fallocate,
1146 AC_DEFINE(HAVE_FILE_FALLOCATE, 1, [fops->fallocate() exists])
1153 dnl # Linux 2.6.x - 2.6.37 API
1155 AC_DEFUN([SPL_AC_KERNEL_INODE_FALLOCATE], [
1156 AC_MSG_CHECKING([whether iops->fallocate() exists])
1157 SPL_LINUX_TRY_COMPILE([
1158 #include <linux/fs.h>
1160 long (*fallocate) (struct inode *, int, loff_t, loff_t) = NULL;
1161 struct inode_operations fops __attribute__ ((unused)) = {
1162 .fallocate = fallocate,
1166 AC_DEFINE(HAVE_INODE_FALLOCATE, 1, [fops->fallocate() exists])
1173 dnl # PaX Linux 2.6.38 - 3.x API
1175 AC_DEFUN([SPL_AC_PAX_KERNEL_FILE_FALLOCATE], [
1176 AC_MSG_CHECKING([whether fops->fallocate() exists])
1177 SPL_LINUX_TRY_COMPILE([
1178 #include <linux/fs.h>
1180 long (*fallocate) (struct file *, int, loff_t, loff_t) = NULL;
1181 struct file_operations_no_const fops __attribute__ ((unused)) = {
1182 .fallocate = fallocate,
1186 AC_DEFINE(HAVE_FILE_FALLOCATE, 1, [fops->fallocate() exists])
1193 dnl # The fallocate callback was moved from the inode_operations
1194 dnl # structure to the file_operations structure.
1196 AC_DEFUN([SPL_AC_KERNEL_FALLOCATE], [
1197 SPL_AC_KERNEL_FILE_FALLOCATE
1198 SPL_AC_KERNEL_INODE_FALLOCATE
1199 SPL_AC_PAX_KERNEL_FILE_FALLOCATE
1203 dnl # zlib inflate compat,
1204 dnl # Verify the kernel has CONFIG_ZLIB_INFLATE support enabled.
1206 AC_DEFUN([SPL_AC_CONFIG_ZLIB_INFLATE], [
1207 AC_MSG_CHECKING([whether CONFIG_ZLIB_INFLATE is defined])
1208 SPL_LINUX_TRY_COMPILE([
1209 #if !defined(CONFIG_ZLIB_INFLATE) && \
1210 !defined(CONFIG_ZLIB_INFLATE_MODULE)
1211 #error CONFIG_ZLIB_INFLATE not defined
1214 AC_MSG_RESULT([yes])
1218 *** This kernel does not include the required zlib inflate support.
1219 *** Rebuild the kernel with CONFIG_ZLIB_INFLATE=y|m set.])
1224 dnl # zlib deflate compat,
1225 dnl # Verify the kernel has CONFIG_ZLIB_DEFLATE support enabled.
1227 AC_DEFUN([SPL_AC_CONFIG_ZLIB_DEFLATE], [
1228 AC_MSG_CHECKING([whether CONFIG_ZLIB_DEFLATE is defined])
1229 SPL_LINUX_TRY_COMPILE([
1230 #if !defined(CONFIG_ZLIB_DEFLATE) && \
1231 !defined(CONFIG_ZLIB_DEFLATE_MODULE)
1232 #error CONFIG_ZLIB_DEFLATE not defined
1235 AC_MSG_RESULT([yes])
1239 *** This kernel does not include the required zlib deflate support.
1240 *** Rebuild the kernel with CONFIG_ZLIB_DEFLATE=y|m set.])
1245 dnl # 2.6.39 API compat,
1246 dnl # The function zlib_deflate_workspacesize() now take 2 arguments.
1247 dnl # This was done to avoid always having to allocate the maximum size
1248 dnl # workspace (268K). The caller can now specific the windowBits and
1249 dnl # memLevel compression parameters to get a smaller workspace.
1251 AC_DEFUN([SPL_AC_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE],
1252 [AC_MSG_CHECKING([whether zlib_deflate_workspacesize() wants 2 args])
1253 SPL_LINUX_TRY_COMPILE([
1254 #include <linux/zlib.h>
1256 return zlib_deflate_workspacesize(MAX_WBITS, MAX_MEM_LEVEL);
1259 AC_DEFINE(HAVE_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE, 1,
1260 [zlib_deflate_workspacesize() wants 2 args])
1267 dnl # 2.6.39 API change,
1268 dnl # Shrinker adjust to use common shrink_control structure.
1270 AC_DEFUN([SPL_AC_SHRINK_CONTROL_STRUCT], [
1271 AC_MSG_CHECKING([whether struct shrink_control exists])
1272 SPL_LINUX_TRY_COMPILE([
1273 #include <linux/mm.h>
1275 struct shrink_control sc __attribute__ ((unused));
1278 sc.gfp_mask = GFP_KERNEL;
1281 AC_DEFINE(HAVE_SHRINK_CONTROL_STRUCT, 1,
1282 [struct shrink_control exists])
1289 dnl # 3.1 API Change
1291 dnl # The rw_semaphore.wait_lock member was changed from spinlock_t to
1292 dnl # raw_spinlock_t at commit ddb6c9b58a19edcfac93ac670b066c836ff729f1.
1294 AC_DEFUN([SPL_AC_RWSEM_SPINLOCK_IS_RAW], [
1295 AC_MSG_CHECKING([whether struct rw_semaphore member wait_lock is raw])
1296 tmp_flags="$EXTRA_KCFLAGS"
1297 EXTRA_KCFLAGS="-Werror"
1298 SPL_LINUX_TRY_COMPILE([
1299 #include <linux/rwsem.h>
1301 struct rw_semaphore dummy_semaphore __attribute__ ((unused));
1302 raw_spinlock_t dummy_lock __attribute__ ((unused));
1303 dummy_semaphore.wait_lock = dummy_lock;
1306 AC_DEFINE(RWSEM_SPINLOCK_IS_RAW, 1,
1307 [struct rw_semaphore member wait_lock is raw_spinlock_t])
1311 EXTRA_KCFLAGS="$tmp_flags"
1315 dnl # 3.9 API change,
1316 dnl # Moved things from linux/sched.h to linux/sched/rt.h
1318 AC_DEFUN([SPL_AC_SCHED_RT_HEADER],
1319 [AC_MSG_CHECKING([whether header linux/sched/rt.h exists])
1320 SPL_LINUX_TRY_COMPILE([
1321 #include <linux/sched.h>
1322 #include <linux/sched/rt.h>
1326 AC_DEFINE(HAVE_SCHED_RT_HEADER, 1, [linux/sched/rt.h exists])
1334 dnl # 3.9 API change,
1335 dnl # vfs_getattr() uses 2 args
1336 dnl # It takes struct path * instead of struct vfsmount * and struct dentry *
1338 AC_DEFUN([SPL_AC_2ARGS_VFS_GETATTR], [
1339 AC_MSG_CHECKING([whether vfs_getattr() wants])
1340 SPL_LINUX_TRY_COMPILE([
1341 #include <linux/fs.h>
1343 vfs_getattr((struct path *) NULL,
1344 (struct kstat *)NULL);
1346 AC_MSG_RESULT(2 args)
1347 AC_DEFINE(HAVE_2ARGS_VFS_GETATTR, 1,
1348 [vfs_getattr wants 2 args])
1350 SPL_LINUX_TRY_COMPILE([
1351 #include <linux/fs.h>
1353 vfs_getattr((struct vfsmount *)NULL,
1354 (struct dentry *)NULL,
1355 (struct kstat *)NULL);
1357 AC_MSG_RESULT(3 args)
1359 AC_MSG_ERROR(unknown)
1365 dnl # 2.6.36 API compatibility.
1366 dnl # Added usleep_range timer.
1367 dnl # usleep_range is a finer precision implementation of msleep
1368 dnl # designed to be a drop-in replacement for udelay where a precise
1369 dnl # sleep / busy-wait is unnecessary.
1371 AC_DEFUN([SPL_AC_USLEEP_RANGE], [
1372 AC_MSG_CHECKING([whether usleep_range() is available])
1373 SPL_LINUX_TRY_COMPILE([
1374 #include <linux/delay.h>
1379 AC_DEFINE(HAVE_USLEEP_RANGE, 1,
1380 [usleep_range is available])
1387 dnl # 2.6.35 API change,
1388 dnl # The cachep->gfpflags member was renamed cachep->allocflags. These are
1389 dnl # private allocation flags which are applied when allocating a new slab
1390 dnl # in kmem_getpages(). Unfortunately there is no public API for setting
1391 dnl # non-default flags.
1393 AC_DEFUN([SPL_AC_KMEM_CACHE_ALLOCFLAGS], [
1394 AC_MSG_CHECKING([whether struct kmem_cache has allocflags])
1395 SPL_LINUX_TRY_COMPILE([
1396 #include <linux/slab.h>
1398 struct kmem_cache cachep __attribute__ ((unused));
1399 cachep.allocflags = GFP_KERNEL;
1402 AC_DEFINE(HAVE_KMEM_CACHE_ALLOCFLAGS, 1,
1403 [struct kmem_cache has allocflags])
1407 AC_MSG_CHECKING([whether struct kmem_cache has gfpflags])
1408 SPL_LINUX_TRY_COMPILE([
1409 #include <linux/slab.h>
1411 struct kmem_cache cachep __attribute__ ((unused));
1412 cachep.gfpflags = GFP_KERNEL;
1415 AC_DEFINE(HAVE_KMEM_CACHE_GFPFLAGS, 1,
1416 [struct kmem_cache has gfpflags])
1424 dnl # 3.17 API change,
1425 dnl # wait_on_bit() no longer requires an action argument. The former
1426 dnl # "wait_on_bit" interface required an 'action' function to be provided
1427 dnl # which does the actual waiting. There were over 20 such functions in the
1428 dnl # kernel, many of them identical, though most cases can be satisfied by one
1429 dnl # of just two functions: one which uses io_schedule() and one which just
1430 dnl # uses schedule(). This API change was made to consolidate all of those
1431 dnl # redundant wait functions.
1433 AC_DEFUN([SPL_AC_WAIT_ON_BIT], [
1434 AC_MSG_CHECKING([whether wait_on_bit() takes an action])
1435 SPL_LINUX_TRY_COMPILE([
1436 #include <linux/wait.h>
1438 int (*action)(void *) = NULL;
1439 wait_on_bit(NULL, 0, action, 0);
1442 AC_DEFINE(HAVE_WAIT_ON_BIT_ACTION, 1, [yes])