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mirror_zfs/config/spl-build.m4
Brian Behlendorf 4b2220f0b9 Add --enable-debug-log configure option 
Until now the notion of an internal debug logging infrastructure
was conflated with enabling ASSERT()s.  This patch clarifies things
by cleanly breaking the two subsystem apart.  The result of this
is the following behavior.

--enable-debug      - Enable/disable code wrapped in ASSERT()s.
--disable-debug       ASSERT()s are used to check invariants and
                      are never required for correct operation.
                      They are disabled by default because they
                      may impact performance.

--enable-debug-log  - Enable/disable the debug log infrastructure.
--disable-debug-log   This infrastructure allows the spl code and
                      its consumer to log messages to an in-kernel
                      log.  The granularity of the logging can be
                      controlled by a debug mask.  By default the
                      mask disables most debug messages resulting
                      in a negligible performance impact.  Because
                      of this the debug log is enabled by default.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2012-02-02 11:27:54 -08:00

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###############################################################################
# Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
# Copyright (C) 2007 The Regents of the University of California.
# Written by Brian Behlendorf <behlendorf1@llnl.gov>.
###############################################################################
# SPL_AC_CONFIG_KERNEL: Default SPL kernel configuration.
###############################################################################
AC_DEFUN([SPL_AC_CONFIG_KERNEL], [
SPL_AC_KERNEL
SPL_AC_KERNEL_CONFIG
if test "${LINUX_OBJ}" != "${LINUX}"; then
KERNELMAKE_PARAMS="$KERNELMAKE_PARAMS O=$LINUX_OBJ"
fi
AC_SUBST(KERNELMAKE_PARAMS)
KERNELCPPFLAGS="$KERNELCPPFLAGS -Wstrict-prototypes"
AC_SUBST(KERNELCPPFLAGS)
SPL_AC_DEBUG
SPL_AC_DEBUG_LOG
SPL_AC_DEBUG_KMEM
SPL_AC_DEBUG_KMEM_TRACKING
SPL_AC_ATOMIC_SPINLOCK
SPL_AC_TYPE_ATOMIC64_CMPXCHG
SPL_AC_TYPE_ATOMIC64_XCHG
SPL_AC_TYPE_UINTPTR_T
SPL_AC_3ARGS_INIT_WORK
SPL_AC_2ARGS_REGISTER_SYSCTL
SPL_AC_SET_SHRINKER
SPL_AC_3ARGS_SHRINKER_CALLBACK
SPL_AC_PATH_IN_NAMEIDATA
SPL_AC_TASK_CURR
SPL_AC_CTL_UNNUMBERED
SPL_AC_CTL_NAME
SPL_AC_FLS64
SPL_AC_DEVICE_CREATE
SPL_AC_5ARGS_DEVICE_CREATE
SPL_AC_CLASS_DEVICE_CREATE
SPL_AC_SET_NORMALIZED_TIMESPEC_EXPORT
SPL_AC_SET_NORMALIZED_TIMESPEC_INLINE
SPL_AC_TIMESPEC_SUB
SPL_AC_INIT_UTSNAME
SPL_AC_FDTABLE_HEADER
SPL_AC_FILES_FDTABLE
SPL_AC_UACCESS_HEADER
SPL_AC_KMALLOC_NODE
SPL_AC_MONOTONIC_CLOCK
SPL_AC_INODE_I_MUTEX
SPL_AC_MUTEX_OWNER
SPL_AC_MUTEX_OWNER_TASK_STRUCT
SPL_AC_MUTEX_LOCK_NESTED
SPL_AC_3ARGS_ON_EACH_CPU
SPL_AC_KALLSYMS_LOOKUP_NAME
SPL_AC_GET_VMALLOC_INFO
SPL_AC_PGDAT_HELPERS
SPL_AC_FIRST_ONLINE_PGDAT
SPL_AC_NEXT_ONLINE_PGDAT
SPL_AC_NEXT_ZONE
SPL_AC_PGDAT_LIST
SPL_AC_GLOBAL_PAGE_STATE
SPL_AC_ZONE_STAT_ITEM_FREE
SPL_AC_ZONE_STAT_ITEM_INACTIVE
SPL_AC_ZONE_STAT_ITEM_ACTIVE
SPL_AC_GET_ZONE_COUNTS
SPL_AC_USER_PATH_DIR
SPL_AC_SET_FS_PWD
SPL_AC_2ARGS_SET_FS_PWD
SPL_AC_2ARGS_VFS_UNLINK
SPL_AC_4ARGS_VFS_RENAME
SPL_AC_VFS_FSYNC
SPL_AC_2ARGS_VFS_FSYNC
SPL_AC_FS_STRUCT_SPINLOCK
SPL_AC_CRED_STRUCT
SPL_AC_GROUPS_SEARCH
SPL_AC_PUT_TASK_STRUCT
SPL_AC_5ARGS_PROC_HANDLER
SPL_AC_KVASPRINTF
SPL_AC_EXPORTED_RWSEM_IS_LOCKED
SPL_AC_KERNEL_INVALIDATE_INODES
SPL_AC_KERNEL_2ARGS_INVALIDATE_INODES
SPL_AC_SHRINK_DCACHE_MEMORY
SPL_AC_SHRINK_ICACHE_MEMORY
SPL_AC_KERN_PATH_PARENT_HEADER
SPL_AC_KERN_PATH_PARENT_SYMBOL
SPL_AC_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE
SPL_AC_SHRINK_CONTROL_STRUCT
SPL_AC_RWSEM_SPINLOCK_IS_RAW
])
AC_DEFUN([SPL_AC_MODULE_SYMVERS], [
modpost=$LINUX/scripts/Makefile.modpost
AC_MSG_CHECKING([kernel file name for module symbols])
if test -f "$modpost"; then
if grep -q Modules.symvers $modpost; then
LINUX_SYMBOLS=Modules.symvers
else
LINUX_SYMBOLS=Module.symvers
fi
if ! test -f "$LINUX_OBJ/$LINUX_SYMBOLS"; then
AC_MSG_ERROR([
*** Please make sure the kernel devel package for your distribution
*** is installed. If your building with a custom kernel make sure the
*** kernel is configured, built, and the '--with-linux=PATH' configure
*** option refers to the location of the kernel source.])
fi
else
LINUX_SYMBOLS=NONE
fi
AC_MSG_RESULT($LINUX_SYMBOLS)
AC_SUBST(LINUX_SYMBOLS)
])
AC_DEFUN([SPL_AC_KERNEL], [
AC_ARG_WITH([linux],
AS_HELP_STRING([--with-linux=PATH],
[Path to kernel source]),
[kernelsrc="$withval"])
AC_ARG_WITH([linux-obj],
AS_HELP_STRING([--with-linux-obj=PATH],
[Path to kernel build objects]),
[kernelbuild="$withval"])
AC_MSG_CHECKING([kernel source directory])
if test -z "$kernelsrc"; then
if test -e "/lib/modules/$(uname -r)/source"; then
headersdir="/lib/modules/$(uname -r)/source"
sourcelink=$(readlink -f "$headersdir")
elif test -e "/lib/modules/$(uname -r)/build"; then
headersdir="/lib/modules/$(uname -r)/build"
sourcelink=$(readlink -f "$headersdir")
else
sourcelink=$(ls -1d /usr/src/kernels/* \
/usr/src/linux-* \
2>/dev/null | grep -v obj | tail -1)
fi
if test -n "$sourcelink" && test -e ${sourcelink}; then
kernelsrc=`readlink -f ${sourcelink}`
else
AC_MSG_RESULT([Not found])
AC_MSG_ERROR([
*** Please make sure the kernel devel package for your distribution
*** is installed then try again. If that fails you can specify the
*** location of the kernel source with the '--with-linux=PATH' option.])
fi
else
if test "$kernelsrc" = "NONE"; then
kernsrcver=NONE
fi
fi
AC_MSG_RESULT([$kernelsrc])
AC_MSG_CHECKING([kernel build directory])
if test -z "$kernelbuild"; then
if test -e "/lib/modules/$(uname -r)/build"; then
kernelbuild=`readlink -f /lib/modules/$(uname -r)/build`
elif test -d ${kernelsrc}-obj/${target_cpu}/${target_cpu}; then
kernelbuild=${kernelsrc}-obj/${target_cpu}/${target_cpu}
elif test -d ${kernelsrc}-obj/${target_cpu}/default; then
kernelbuild=${kernelsrc}-obj/${target_cpu}/default
elif test -d `dirname ${kernelsrc}`/build-${target_cpu}; then
kernelbuild=`dirname ${kernelsrc}`/build-${target_cpu}
else
kernelbuild=${kernelsrc}
fi
fi
AC_MSG_RESULT([$kernelbuild])
AC_MSG_CHECKING([kernel source version])
utsrelease1=$kernelbuild/include/linux/version.h
utsrelease2=$kernelbuild/include/linux/utsrelease.h
utsrelease3=$kernelbuild/include/generated/utsrelease.h
if test -r $utsrelease1 && fgrep -q UTS_RELEASE $utsrelease1; then
utsrelease=linux/version.h
elif test -r $utsrelease2 && fgrep -q UTS_RELEASE $utsrelease2; then
utsrelease=linux/utsrelease.h
elif test -r $utsrelease3 && fgrep -q UTS_RELEASE $utsrelease3; then
utsrelease=generated/utsrelease.h
fi
if test "$utsrelease"; then
kernsrcver=`(echo "#include <$utsrelease>";
echo "kernsrcver=UTS_RELEASE") |
cpp -I $kernelbuild/include |
grep "^kernsrcver=" | cut -d \" -f 2`
if test -z "$kernsrcver"; then
AC_MSG_RESULT([Not found])
AC_MSG_ERROR([*** Cannot determine kernel version.])
fi
else
AC_MSG_RESULT([Not found])
AC_MSG_ERROR([*** Cannot find UTS_RELEASE definition.])
fi
AC_MSG_RESULT([$kernsrcver])
LINUX=${kernelsrc}
LINUX_OBJ=${kernelbuild}
LINUX_VERSION=${kernsrcver}
AC_SUBST(LINUX)
AC_SUBST(LINUX_OBJ)
AC_SUBST(LINUX_VERSION)
SPL_AC_MODULE_SYMVERS
])
AC_DEFUN([SPL_AC_KERNEL_CONFIG], [
SPL_LINUX_CONFIG([PREEMPT],
AC_MSG_ERROR([
*** Kernel built with CONFIG_PREEMPT which is not supported.
** You must rebuild your kernel without this option.]), [])
])
dnl #
dnl # Default SPL user configuration
dnl #
AC_DEFUN([SPL_AC_CONFIG_USER], [])
dnl #
dnl # Check for rpm+rpmbuild to build RPM packages. If these tools
dnl # are missing it is non-fatal but you will not be able to build
dnl # RPM packages and will be warned if you try too.
dnl #
AC_DEFUN([SPL_AC_RPM], [
RPM=rpm
RPMBUILD=rpmbuild
AC_MSG_CHECKING([whether $RPM is available])
AS_IF([tmp=$($RPM --version 2>/dev/null)], [
RPM_VERSION=$(echo $tmp | $AWK '/RPM/ { print $[3] }')
HAVE_RPM=yes
AC_MSG_RESULT([$HAVE_RPM ($RPM_VERSION)])
],[
HAVE_RPM=no
AC_MSG_RESULT([$HAVE_RPM])
])
AC_MSG_CHECKING([whether $RPMBUILD is available])
AS_IF([tmp=$($RPMBUILD --version 2>/dev/null)], [
RPMBUILD_VERSION=$(echo $tmp | $AWK '/RPM/ { print $[3] }')
HAVE_RPMBUILD=yes
AC_MSG_RESULT([$HAVE_RPMBUILD ($RPMBUILD_VERSION)])
],[
HAVE_RPMBUILD=no
AC_MSG_RESULT([$HAVE_RPMBUILD])
])
AC_SUBST(HAVE_RPM)
AC_SUBST(RPM)
AC_SUBST(RPM_VERSION)
AC_SUBST(HAVE_RPMBUILD)
AC_SUBST(RPMBUILD)
AC_SUBST(RPMBUILD_VERSION)
])
dnl #
dnl # Check for dpkg+dpkg-buildpackage to build DEB packages. If these
dnl # tools are missing it is non-fatal but you will not be able to build
dnl # DEB packages and will be warned if you try too.
dnl #
AC_DEFUN([SPL_AC_DPKG], [
DPKG=dpkg
DPKGBUILD=dpkg-buildpackage
AC_MSG_CHECKING([whether $DPKG is available])
AS_IF([tmp=$($DPKG --version 2>/dev/null)], [
DPKG_VERSION=$(echo $tmp | $AWK '/Debian/ { print $[7] }')
HAVE_DPKG=yes
AC_MSG_RESULT([$HAVE_DPKG ($DPKG_VERSION)])
],[
HAVE_DPKG=no
AC_MSG_RESULT([$HAVE_DPKG])
])
AC_MSG_CHECKING([whether $DPKGBUILD is available])
AS_IF([tmp=$($DPKGBUILD --version 2>/dev/null)], [
DPKGBUILD_VERSION=$(echo $tmp | \
$AWK '/Debian/ { print $[4] }' | cut -f-4 -d'.')
HAVE_DPKGBUILD=yes
AC_MSG_RESULT([$HAVE_DPKGBUILD ($DPKGBUILD_VERSION)])
],[
HAVE_DPKGBUILD=no
AC_MSG_RESULT([$HAVE_DPKGBUILD])
])
AC_SUBST(HAVE_DPKG)
AC_SUBST(DPKG)
AC_SUBST(DPKG_VERSION)
AC_SUBST(HAVE_DPKGBUILD)
AC_SUBST(DPKGBUILD)
AC_SUBST(DPKGBUILD_VERSION)
])
dnl #
dnl # Check for pacman+makepkg to build Arch Linux packages. If these
dnl # tools are missing it is non-fatal but you will not be able to
dnl # build Arch Linux packages and will be warned if you try too.
dnl #
AC_DEFUN([SPL_AC_PACMAN], [
PACMAN=pacman
MAKEPKG=makepkg
AC_MSG_CHECKING([whether $PACMAN is available])
tmp=$($PACMAN --version 2>/dev/null)
AS_IF([test -n "$tmp"], [
PACMAN_VERSION=$(echo $tmp |
$AWK '/Pacman/ { print $[3] }' |
$SED 's/^v//')
HAVE_PACMAN=yes
AC_MSG_RESULT([$HAVE_PACMAN ($PACMAN_VERSION)])
],[
HAVE_PACMAN=no
AC_MSG_RESULT([$HAVE_PACMAN])
])
AC_MSG_CHECKING([whether $MAKEPKG is available])
tmp=$($MAKEPKG --version 2>/dev/null)
AS_IF([test -n "$tmp"], [
MAKEPKG_VERSION=$(echo $tmp | $AWK '/makepkg/ { print $[3] }')
HAVE_MAKEPKG=yes
AC_MSG_RESULT([$HAVE_MAKEPKG ($MAKEPKG_VERSION)])
],[
HAVE_MAKEPKG=no
AC_MSG_RESULT([$HAVE_MAKEPKG])
])
AC_SUBST(HAVE_PACMAN)
AC_SUBST(PACMAN)
AC_SUBST(PACMAN_VERSION)
AC_SUBST(HAVE_MAKEPKG)
AC_SUBST(MAKEPKG)
AC_SUBST(MAKEPKG_VERSION)
])
dnl #
dnl # Until native packaging for various different packing systems
dnl # can be added the least we can do is attempt to use alien to
dnl # convert the RPM packages to the needed package type. This is
dnl # a hack but so far it has worked reasonable well.
dnl #
AC_DEFUN([SPL_AC_ALIEN], [
ALIEN=alien
AC_MSG_CHECKING([whether $ALIEN is available])
AS_IF([tmp=$($ALIEN --version 2>/dev/null)], [
ALIEN_VERSION=$(echo $tmp | $AWK '{ print $[3] }')
HAVE_ALIEN=yes
AC_MSG_RESULT([$HAVE_ALIEN ($ALIEN_VERSION)])
],[
HAVE_ALIEN=no
AC_MSG_RESULT([$HAVE_ALIEN])
])
AC_SUBST(HAVE_ALIEN)
AC_SUBST(ALIEN)
AC_SUBST(ALIEN_VERSION)
])
dnl #
dnl # Using the VENDOR tag from config.guess set the default
dnl # package type for 'make pkg': (rpm | deb | tgz)
dnl #
AC_DEFUN([SPL_AC_DEFAULT_PACKAGE], [
AC_MSG_CHECKING([linux distribution])
if test -f /etc/redhat-release ; then
VENDOR=redhat ;
elif test -f /etc/fedora-release ; then
VENDOR=fedora ;
elif test -f /etc/arch-release ; then
VENDOR=arch ;
elif test -f /etc/lsb-release ; then
VENDOR=ubuntu ;
elif test -f /etc/debian_version ; then
VENDOR=debian ;
elif test -f /etc/SuSE-release ; then
VENDOR=sles ;
elif test -f /etc/slackware-version ; then
VENDOR=slackware ;
elif test -f /etc/gentoo-release ; then
VENDOR=gentoo ;
else
VENDOR= ;
fi
AC_MSG_RESULT([$VENDOR])
AC_SUBST(VENDOR)
AC_MSG_CHECKING([default package type])
case "$VENDOR" in
fedora) DEFAULT_PACKAGE=rpm ;;
redhat) DEFAULT_PACKAGE=rpm ;;
sles) DEFAULT_PACKAGE=rpm ;;
ubuntu) DEFAULT_PACKAGE=deb ;;
debian) DEFAULT_PACKAGE=deb ;;
slackware) DEFAULT_PACKAGE=tgz ;;
arch) DEFAULT_PACKAGE=arch;;
*) DEFAULT_PACKAGE=rpm ;;
esac
AC_MSG_RESULT([$DEFAULT_PACKAGE])
AC_SUBST(DEFAULT_PACKAGE)
])
dnl #
dnl # Default SPL user configuration
dnl #
AC_DEFUN([SPL_AC_PACKAGE], [
SPL_AC_DEFAULT_PACKAGE
SPL_AC_RPM
SPL_AC_DPKG
SPL_AC_ALIEN
AS_IF([test "$VENDOR" = "arch"], [SPL_AC_PACMAN])
])
AC_DEFUN([SPL_AC_LICENSE], [
AC_MSG_CHECKING([spl license])
LICENSE=GPL
AC_MSG_RESULT([$LICENSE])
KERNELCPPFLAGS="${KERNELCPPFLAGS} -DHAVE_GPL_ONLY_SYMBOLS"
AC_SUBST(LICENSE)
])
AC_DEFUN([SPL_AC_CONFIG], [
SPL_CONFIG=all
AC_ARG_WITH([config],
AS_HELP_STRING([--with-config=CONFIG],
[Config file 'kernel|user|all|srpm']),
[SPL_CONFIG="$withval"])
AC_MSG_CHECKING([spl config])
AC_MSG_RESULT([$SPL_CONFIG]);
AC_SUBST(SPL_CONFIG)
case "$SPL_CONFIG" in
kernel) SPL_AC_CONFIG_KERNEL ;;
user) SPL_AC_CONFIG_USER ;;
all) SPL_AC_CONFIG_KERNEL
SPL_AC_CONFIG_USER ;;
srpm) ;;
*)
AC_MSG_RESULT([Error!])
AC_MSG_ERROR([Bad value "$SPL_CONFIG" for --with-config,
user kernel|user|all|srpm]) ;;
esac
AM_CONDITIONAL([CONFIG_USER],
[test "$SPL_CONFIG" = user] ||
[test "$SPL_CONFIG" = all])
AM_CONDITIONAL([CONFIG_KERNEL],
[test "$SPL_CONFIG" = kernel] ||
[test "$SPL_CONFIG" = all])
])
dnl #
dnl # Enable if the SPL should be compiled with internal debugging enabled.
dnl # By default this support is disabled.
dnl #
AC_DEFUN([SPL_AC_DEBUG], [
AC_MSG_CHECKING([whether debugging is enabled])
AC_ARG_ENABLE([debug],
[AS_HELP_STRING([--enable-debug],
[Enable generic debug support @<:@default=no@:>@])],
[],
[enable_debug=no])
AS_IF([test "x$enable_debug" = xyes],
[
KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG -Werror"
DEBUG_CFLAGS="-DDEBUG -Werror"
],
[
KERNELCPPFLAGS="${KERNELCPPFLAGS} -DNDEBUG"
DEBUG_CFLAGS="-DNDEBUG"
])
AC_SUBST(DEBUG_CFLAGS)
AC_MSG_RESULT([$enable_debug])
])
dnl #
dnl # Enabled by default it provides a basic debug log infrastructure.
dnl # Each subsystem registers itself with a name and logs messages
dnl # using predefined types. If the debug mask it set to allow the
dnl # message type it will be written to the internal log. The log
dnl # can be dumped to a file by echoing 1 to the 'dump' proc entry,
dnl # after dumping the log it must be decoded using the spl utility.
dnl #
dnl # echo 1 >/proc/sys/kernel/spl/debug/dump
dnl # spl /tmp/spl-log.xxx.yyy /tmp/spl-log.xxx.yyy.txt
dnl #
AC_DEFUN([SPL_AC_DEBUG_LOG], [
AC_ARG_ENABLE([debug-log],
[AS_HELP_STRING([--enable-debug-log],
[Enable basic debug logging @<:@default=yes@:>@])],
[],
[enable_debug_log=yes])
AS_IF([test "x$enable_debug_log" = xyes],
[AC_DEFINE([DEBUG_LOG], [1],
[Define to 1 to enable basic debug logging])
KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_LOG"])
AC_MSG_CHECKING([whether basic debug logging is enabled])
AC_MSG_RESULT([$enable_debug_log])
])
dnl #
dnl # Enabled by default it provides a minimal level of memory tracking.
dnl # A total count of bytes allocated is kept for each alloc and free.
dnl # Then at module unload time a report to the console will be printed
dnl # if memory was leaked. Additionally, /proc/spl/kmem/slab will exist
dnl # and provide an easy way to inspect the kmem based slab.
dnl #
AC_DEFUN([SPL_AC_DEBUG_KMEM], [
AC_ARG_ENABLE([debug-kmem],
[AS_HELP_STRING([--enable-debug-kmem],
[Enable basic kmem accounting @<:@default=yes@:>@])],
[],
[enable_debug_kmem=yes])
AS_IF([test "x$enable_debug_kmem" = xyes],
[AC_DEFINE([DEBUG_KMEM], [1],
[Define to 1 to enable basic kmem accounting])
KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_KMEM"])
AC_MSG_CHECKING([whether basic kmem accounting is enabled])
AC_MSG_RESULT([$enable_debug_kmem])
])
dnl #
dnl # Disabled by default it provides detailed memory tracking. This
dnl # feature also requires --enable-debug-kmem to be set. When enabled
dnl # not only will total bytes be tracked but also the location of every
dnl # alloc and free. When the SPL module is unloaded a list of all leaked
dnl # addresses and where they were allocated will be dumped to the console.
dnl # Enabling this feature has a significant impact on performance but it
dnl # makes finding memory leaks pretty straight forward.
dnl #
AC_DEFUN([SPL_AC_DEBUG_KMEM_TRACKING], [
AC_ARG_ENABLE([debug-kmem-tracking],
[AS_HELP_STRING([--enable-debug-kmem-tracking],
[Enable detailed kmem tracking @<:@default=no@:>@])],
[],
[enable_debug_kmem_tracking=no])
AS_IF([test "x$enable_debug_kmem_tracking" = xyes],
[AC_DEFINE([DEBUG_KMEM_TRACKING], [1],
[Define to 1 to enable detailed kmem tracking])
KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_KMEM_TRACKING"])
AC_MSG_CHECKING([whether detailed kmem tracking is enabled])
AC_MSG_RESULT([$enable_debug_kmem_tracking])
])
dnl #
dnl # SPL_LINUX_CONFTEST
dnl #
AC_DEFUN([SPL_LINUX_CONFTEST], [
cat confdefs.h - <<_ACEOF >conftest.c
$1
_ACEOF
])
dnl #
dnl # SPL_LANG_PROGRAM(C)([PROLOGUE], [BODY])
dnl #
m4_define([SPL_LANG_PROGRAM], [
$1
int
main (void)
{
dnl Do *not* indent the following line: there may be CPP directives.
dnl Don't move the `;' right after for the same reason.
$2
;
return 0;
}
])
dnl #
dnl # SPL_LINUX_COMPILE_IFELSE / like AC_COMPILE_IFELSE
dnl #
AC_DEFUN([SPL_LINUX_COMPILE_IFELSE], [
m4_ifvaln([$1], [SPL_LINUX_CONFTEST([$1])])
rm -Rf build && mkdir -p build
echo "obj-m := conftest.o" >build/Makefile
AS_IF(
[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) >/dev/null && AC_TRY_COMMAND([$3])],
[$4],
[_AC_MSG_LOG_CONFTEST m4_ifvaln([$5],[$5])]
)
rm -Rf build
])
dnl #
dnl # SPL_LINUX_TRY_COMPILE like AC_TRY_COMPILE
dnl #
AC_DEFUN([SPL_LINUX_TRY_COMPILE],
[SPL_LINUX_COMPILE_IFELSE(
[AC_LANG_SOURCE([SPL_LANG_PROGRAM([[$1]], [[$2]])])],
[modules],
[test -s build/conftest.o],
[$3], [$4])
])
dnl #
dnl # SPL_LINUX_CONFIG
dnl #
AC_DEFUN([SPL_LINUX_CONFIG],
[AC_MSG_CHECKING([whether Linux was built with CONFIG_$1])
SPL_LINUX_TRY_COMPILE([
#include <linux/module.h>
],[
#ifndef CONFIG_$1
#error CONFIG_$1 not #defined
#endif
],[
AC_MSG_RESULT([yes])
$2
],[
AC_MSG_RESULT([no])
$3
])
])
dnl #
dnl # SPL_CHECK_SYMBOL_EXPORT
dnl # check symbol exported or not
dnl #
AC_DEFUN([SPL_CHECK_SYMBOL_EXPORT],
[AC_MSG_CHECKING([whether symbol $1 is exported])
grep -q -E '[[[:space:]]]$1[[[:space:]]]' \
$LINUX_OBJ/Module*.symvers 2>/dev/null
rc=$?
if test $rc -ne 0; then
export=0
for file in $2; do
grep -q -E "EXPORT_SYMBOL.*($1)" \
"$LINUX_OBJ/$file" 2>/dev/null
rc=$?
if test $rc -eq 0; then
export=1
break;
fi
done
if test $export -eq 0; then
AC_MSG_RESULT([no])
$4
else
AC_MSG_RESULT([yes])
$3
fi
else
AC_MSG_RESULT([yes])
$3
fi
])
dnl #
dnl # SPL_CHECK_SYMBOL_HEADER
dnl # check if a symbol prototype is defined in listed headers.
dnl #
AC_DEFUN([SPL_CHECK_SYMBOL_HEADER], [
AC_MSG_CHECKING([whether symbol $1 exists in header])
header=0
for file in $3; do
grep -q "$2" "$LINUX/$file" 2>/dev/null
rc=$?
if test $rc -eq 0; then
header=1
break;
fi
done
if test $header -eq 0; then
AC_MSG_RESULT([no])
$5
else
AC_MSG_RESULT([yes])
$4
fi
])
dnl #
dnl # SPL_CHECK_HEADER
dnl # check whether header exists and define HAVE_$2_HEADER
dnl #
AC_DEFUN([SPL_CHECK_HEADER],
[AC_MSG_CHECKING([whether header $1 exists])
SPL_LINUX_TRY_COMPILE([
#include <$1>
],[
return 0;
],[
AC_DEFINE(HAVE_$2_HEADER, 1, [$1 exists])
AC_MSG_RESULT(yes)
$3
],[
AC_MSG_RESULT(no)
$4
])
])
dnl #
dnl # Use the atomic implemenation based on global spinlocks. This
dnl # should only be needed by 32-bit kernels which do not provide
dnl # the atomic64_* API. It may be optionally enabled as a fallback
dnl # if problems are observed with the direct mapping to the native
dnl # Linux atomic operations. You may not disable atomic spinlocks
dnl # if you kernel does not an atomic64_* API.
dnl #
AC_DEFUN([SPL_AC_ATOMIC_SPINLOCK], [
AC_ARG_ENABLE([atomic-spinlocks],
[AS_HELP_STRING([--enable-atomic-spinlocks],
[Atomic types use spinlocks @<:@default=check@:>@])],
[],
[enable_atomic_spinlocks=check])
SPL_LINUX_TRY_COMPILE([
#include <asm/atomic.h>
],[
atomic64_t *ptr __attribute__ ((unused));
],[
have_atomic64_t=yes
AC_DEFINE(HAVE_ATOMIC64_T, 1,
[kernel defines atomic64_t])
],[
have_atomic64_t=no
])
AS_IF([test "x$enable_atomic_spinlocks" = xcheck], [
AS_IF([test "x$have_atomic64_t" = xyes], [
enable_atomic_spinlocks=no
],[
enable_atomic_spinlocks=yes
])
])
AS_IF([test "x$enable_atomic_spinlocks" = xyes], [
AC_DEFINE([ATOMIC_SPINLOCK], [1],
[Atomic types use spinlocks])
],[
AS_IF([test "x$have_atomic64_t" = xno], [
AC_MSG_FAILURE(
[--disable-atomic-spinlocks given but required atomic64 support is unavailable])
])
])
AC_MSG_CHECKING([whether atomic types use spinlocks])
AC_MSG_RESULT([$enable_atomic_spinlocks])
AC_MSG_CHECKING([whether kernel defines atomic64_t])
AC_MSG_RESULT([$have_atomic64_t])
])
dnl #
dnl # 2.6.24 API change,
dnl # check if atomic64_cmpxchg is defined
dnl #
AC_DEFUN([SPL_AC_TYPE_ATOMIC64_CMPXCHG],
[AC_MSG_CHECKING([whether kernel defines atomic64_cmpxchg])
SPL_LINUX_TRY_COMPILE([
#include <asm/atomic.h>
#include <asm/system.h>
],[
atomic64_cmpxchg((atomic64_t *)NULL, 0, 0);
],[
AC_MSG_RESULT([yes])
AC_DEFINE(HAVE_ATOMIC64_CMPXCHG, 1,
[kernel defines atomic64_cmpxchg])
],[
AC_MSG_RESULT([no])
])
])
dnl #
dnl # 2.6.24 API change,
dnl # check if atomic64_xchg is defined
dnl #
AC_DEFUN([SPL_AC_TYPE_ATOMIC64_XCHG],
[AC_MSG_CHECKING([whether kernel defines atomic64_xchg])
SPL_LINUX_TRY_COMPILE([
#include <asm/atomic.h>
],[
atomic64_xchg((atomic64_t *)NULL, 0);
],[
AC_MSG_RESULT([yes])
AC_DEFINE(HAVE_ATOMIC64_XCHG, 1,
[kernel defines atomic64_xchg])
],[
AC_MSG_RESULT([no])
])
])
dnl #
dnl # 2.6.24 API change,
dnl # check if uintptr_t typedef is defined
dnl #
AC_DEFUN([SPL_AC_TYPE_UINTPTR_T],
[AC_MSG_CHECKING([whether kernel defines uintptr_t])
SPL_LINUX_TRY_COMPILE([
#include <linux/types.h>
],[
uintptr_t *ptr __attribute__ ((unused));
],[
AC_MSG_RESULT([yes])
AC_DEFINE(HAVE_UINTPTR_T, 1,
[kernel defines uintptr_t])
],[
AC_MSG_RESULT([no])
])
])
dnl #
dnl # 2.6.20 API change,
dnl # INIT_WORK use 2 args and not store data inside
dnl #
AC_DEFUN([SPL_AC_3ARGS_INIT_WORK],
[AC_MSG_CHECKING([whether INIT_WORK wants 3 args])
SPL_LINUX_TRY_COMPILE([
#include <linux/workqueue.h>
],[
struct work_struct work __attribute__ ((unused));
INIT_WORK(&work, NULL, NULL);
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_3ARGS_INIT_WORK, 1,
[INIT_WORK wants 3 args])
],[
AC_MSG_RESULT(no)
])
])
dnl #
dnl # 2.6.21 API change,
dnl # 'register_sysctl_table' use only one argument instead of two
dnl #
AC_DEFUN([SPL_AC_2ARGS_REGISTER_SYSCTL],
[AC_MSG_CHECKING([whether register_sysctl_table() wants 2 args])
SPL_LINUX_TRY_COMPILE([
#include <linux/sysctl.h>
],[
(void) register_sysctl_table(NULL, 0);
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_2ARGS_REGISTER_SYSCTL, 1,
[register_sysctl_table() wants 2 args])
],[
AC_MSG_RESULT(no)
])
])
dnl #
dnl # 2.6.23 API change
dnl # Old set_shrinker API replaced with register_shrinker
dnl #
AC_DEFUN([SPL_AC_SET_SHRINKER], [
AC_MSG_CHECKING([whether set_shrinker() available])
SPL_LINUX_TRY_COMPILE([
#include <linux/mm.h>
],[
return set_shrinker(DEFAULT_SEEKS, NULL);
],[
AC_MSG_RESULT([yes])
AC_DEFINE(HAVE_SET_SHRINKER, 1,
[set_shrinker() available])
],[
AC_MSG_RESULT([no])
])
])
dnl #
dnl # 2.6.35 API change,
dnl # Add context to shrinker callback
dnl #
AC_DEFUN([SPL_AC_3ARGS_SHRINKER_CALLBACK],
[AC_MSG_CHECKING([whether shrinker callback wants 3 args])
tmp_flags="$EXTRA_KCFLAGS"
EXTRA_KCFLAGS="-Werror"
SPL_LINUX_TRY_COMPILE([
#include <linux/mm.h>
int shrinker_cb(struct shrinker *, int, unsigned int);
],[
struct shrinker cache_shrinker = {
.shrink = shrinker_cb,
.seeks = DEFAULT_SEEKS,
};
register_shrinker(&cache_shrinker);
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_3ARGS_SHRINKER_CALLBACK, 1,
[shrinker callback wants 3 args])
],[
AC_MSG_RESULT(no)
])
EXTRA_KCFLAGS="$tmp_flags"
])
dnl #
dnl # 2.6.25 API change,
dnl # struct path entry added to struct nameidata
dnl #
AC_DEFUN([SPL_AC_PATH_IN_NAMEIDATA],
[AC_MSG_CHECKING([whether struct path used in struct nameidata])
SPL_LINUX_TRY_COMPILE([
#include <linux/namei.h>
],[
struct nameidata nd __attribute__ ((unused));
nd.path.mnt = NULL;
nd.path.dentry = NULL;
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_PATH_IN_NAMEIDATA, 1,
[struct path used in struct nameidata])
],[
AC_MSG_RESULT(no)
])
])
dnl #
dnl # Custom SPL patch may export this system it is not required
dnl #
AC_DEFUN([SPL_AC_TASK_CURR], [
SPL_CHECK_SYMBOL_EXPORT([task_curr], [kernel/sched.c],
[AC_DEFINE(HAVE_TASK_CURR, 1, [task_curr() exported])],
[])
])
dnl #
dnl # 2.6.19 API change,
dnl # Use CTL_UNNUMBERED when binary sysctl is not required
dnl #
AC_DEFUN([SPL_AC_CTL_UNNUMBERED],
[AC_MSG_CHECKING([whether unnumbered sysctl support exists])
SPL_LINUX_TRY_COMPILE([
#include <linux/sysctl.h>
],[
#ifndef CTL_UNNUMBERED
#error CTL_UNNUMBERED undefined
#endif
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_CTL_UNNUMBERED, 1,
[unnumbered sysctl support exists])
],[
AC_MSG_RESULT(no)
])
])
dnl #
dnl # 2.6.33 API change,
dnl # Removed .ctl_name from struct ctl_table.
dnl #
AC_DEFUN([SPL_AC_CTL_NAME], [
AC_MSG_CHECKING([whether struct ctl_table has ctl_name])
SPL_LINUX_TRY_COMPILE([
#include <linux/sysctl.h>
],[
struct ctl_table ctl __attribute__ ((unused));
ctl.ctl_name = 0;
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_CTL_NAME, 1, [struct ctl_table has ctl_name])
],[
AC_MSG_RESULT(no)
])
])
dnl #
dnl # 2.6.16 API change.
dnl # Check if 'fls64()' is available
dnl #
AC_DEFUN([SPL_AC_FLS64],
[AC_MSG_CHECKING([whether fls64() is available])
SPL_LINUX_TRY_COMPILE([
#include <linux/bitops.h>
],[
return fls64(0);
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_FLS64, 1, [fls64() is available])
],[
AC_MSG_RESULT(no)
])
])
dnl #
dnl # 2.6.18 API change, check whether device_create() is available.
dnl # Device_create() was introduced in 2.6.18 and depricated
dnl # class_device_create() which was fully removed in 2.6.26.
dnl #
AC_DEFUN([SPL_AC_DEVICE_CREATE], [
SPL_CHECK_SYMBOL_EXPORT(
[device_create],
[drivers/base/core.c],
[AC_DEFINE(HAVE_DEVICE_CREATE, 1,
[device_create() is available])],
[])
])
dnl #
dnl # 2.6.27 API change,
dnl # device_create() uses 5 args, new 'drvdata' argument.
dnl #
AC_DEFUN([SPL_AC_5ARGS_DEVICE_CREATE], [
AC_MSG_CHECKING([whether device_create() wants 5 args])
tmp_flags="$EXTRA_KCFLAGS"
EXTRA_KCFLAGS="-Werror"
SPL_LINUX_TRY_COMPILE([
#include <linux/device.h>
],[
device_create(NULL, NULL, 0, NULL, "%d", 1);
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_5ARGS_DEVICE_CREATE, 1,
[device_create wants 5 args])
],[
AC_MSG_RESULT(no)
])
EXTRA_KCFLAGS="$tmp_flags"
])
dnl #
dnl # 2.6.13 API change, check whether class_device_create() is available.
dnl # Class_device_create() was introduced in 2.6.13 and depricated
dnl # class_simple_device_add() which was fully removed in 2.6.13.
dnl #
AC_DEFUN([SPL_AC_CLASS_DEVICE_CREATE], [
SPL_CHECK_SYMBOL_EXPORT(
[class_device_create],
[drivers/base/class.c],
[AC_DEFINE(HAVE_CLASS_DEVICE_CREATE, 1,
[class_device_create() is available])],
[])
])
dnl #
dnl # 2.6.26 API change, set_normalized_timespec() is exported.
dnl #
AC_DEFUN([SPL_AC_SET_NORMALIZED_TIMESPEC_EXPORT], [
SPL_CHECK_SYMBOL_EXPORT(
[set_normalized_timespec],
[kernel/time.c],
[AC_DEFINE(HAVE_SET_NORMALIZED_TIMESPEC_EXPORT, 1,
[set_normalized_timespec() is available as export])],
[])
])
dnl #
dnl # 2.6.16 API change, set_normalize_timespec() moved to time.c
dnl # previously it was available in time.h as an inline.
dnl #
AC_DEFUN([SPL_AC_SET_NORMALIZED_TIMESPEC_INLINE], [
AC_MSG_CHECKING([whether set_normalized_timespec() is an inline])
SPL_LINUX_TRY_COMPILE([
#include <linux/time.h>
void set_normalized_timespec(struct timespec *ts,
time_t sec, long nsec) { }
],
[],
[
AC_MSG_RESULT(no)
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_SET_NORMALIZED_TIMESPEC_INLINE, 1,
[set_normalized_timespec() is available as inline])
])
])
dnl #
dnl # 2.6.18 API change,
dnl # timespec_sub() inline function available in linux/time.h
dnl #
AC_DEFUN([SPL_AC_TIMESPEC_SUB], [
AC_MSG_CHECKING([whether timespec_sub() is available])
SPL_LINUX_TRY_COMPILE([
#include <linux/time.h>
],[
struct timespec a = { 0 };
struct timespec b = { 0 };
struct timespec c __attribute__ ((unused));
c = timespec_sub(a, b);
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_TIMESPEC_SUB, 1, [timespec_sub() is available])
],[
AC_MSG_RESULT(no)
])
])
dnl #
dnl # 2.6.19 API change,
dnl # check if init_utsname() is available in linux/utsname.h
dnl #
AC_DEFUN([SPL_AC_INIT_UTSNAME], [
AC_MSG_CHECKING([whether init_utsname() is available])
SPL_LINUX_TRY_COMPILE([
#include <linux/utsname.h>
],[
struct new_utsname *a __attribute__ ((unused));
a = init_utsname();
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_INIT_UTSNAME, 1, [init_utsname() is available])
],[
AC_MSG_RESULT(no)
])
])
dnl #
dnl # 2.6.26 API change,
dnl # definition of struct fdtable relocated to linux/fdtable.h
dnl #
AC_DEFUN([SPL_AC_FDTABLE_HEADER], [
SPL_CHECK_HEADER([linux/fdtable.h], [FDTABLE], [], [])
])
dnl #
dnl # 2.6.14 API change,
dnl # check whether 'files_fdtable()' exists
dnl #
AC_DEFUN([SPL_AC_FILES_FDTABLE], [
AC_MSG_CHECKING([whether files_fdtable() is available])
SPL_LINUX_TRY_COMPILE([
#include <linux/sched.h>
#include <linux/file.h>
#ifdef HAVE_FDTABLE_HEADER
#include <linux/fdtable.h>
#endif
],[
struct files_struct *files = current->files;
struct fdtable *fdt __attribute__ ((unused));
fdt = files_fdtable(files);
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_FILES_FDTABLE, 1, [files_fdtable() is available])
],[
AC_MSG_RESULT(no)
])
])
dnl #
dnl # 2.6.18 API change,
dnl # added linux/uaccess.h
dnl #
AC_DEFUN([SPL_AC_UACCESS_HEADER], [
SPL_CHECK_HEADER([linux/uaccess.h], [UACCESS], [], [])
])
dnl #
dnl # 2.6.12 API change,
dnl # check whether 'kmalloc_node()' is available.
dnl #
AC_DEFUN([SPL_AC_KMALLOC_NODE], [
AC_MSG_CHECKING([whether kmalloc_node() is available])
SPL_LINUX_TRY_COMPILE([
#include <linux/slab.h>
],[
void *a __attribute__ ((unused));
a = kmalloc_node(1, GFP_KERNEL, 0);
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_KMALLOC_NODE, 1, [kmalloc_node() is available])
],[
AC_MSG_RESULT(no)
])
])
dnl #
dnl # 2.6.9 API change,
dnl # check whether 'monotonic_clock()' is available it may
dnl # be available for some archs but not others.
dnl #
AC_DEFUN([SPL_AC_MONOTONIC_CLOCK], [
SPL_CHECK_SYMBOL_EXPORT(
[monotonic_clock],
[],
[AC_DEFINE(HAVE_MONOTONIC_CLOCK, 1,
[monotonic_clock() is available])],
[])
])
dnl #
dnl # 2.6.16 API change,
dnl # check whether 'struct inode' has i_mutex
dnl #
AC_DEFUN([SPL_AC_INODE_I_MUTEX], [
AC_MSG_CHECKING([whether struct inode has i_mutex])
SPL_LINUX_TRY_COMPILE([
#include <linux/fs.h>
#include <linux/mutex.h>
],[
struct inode i;
mutex_init(&i.i_mutex);
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_INODE_I_MUTEX, 1, [struct inode has i_mutex])
],[
AC_MSG_RESULT(no)
])
])
dnl #
dnl # 2.6.29 API change,
dnl # Adaptive mutexs introduced.
dnl #
AC_DEFUN([SPL_AC_MUTEX_OWNER], [
AC_MSG_CHECKING([whether struct mutex has owner])
SPL_LINUX_TRY_COMPILE([
#include <linux/mutex.h>
],[
struct mutex mtx __attribute__ ((unused));
mtx.owner = NULL;
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_MUTEX_OWNER, 1, [struct mutex has owner])
],[
AC_MSG_RESULT(no)
])
])
dnl #
dnl # 2.6.39 API change,
dnl # Owner type change. A Linux mutex prior to 2.6.39 would store
dnl # the owner as a thread_info pointer when CONFIG_DEBUG_MUTEXES
dnl # was defined. As of 2.6.39 this was changed to a task_struct
dnl # pointer which frankly makes a lot more sense.
dnl #
AC_DEFUN([SPL_AC_MUTEX_OWNER_TASK_STRUCT], [
AC_MSG_CHECKING([whether struct mutex owner is a task_struct])
tmp_flags="$EXTRA_KCFLAGS"
EXTRA_KCFLAGS="-Werror"
SPL_LINUX_TRY_COMPILE([
#include <linux/mutex.h>
],[
struct mutex mtx __attribute__ ((unused));
mtx.owner = current;
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_MUTEX_OWNER_TASK_STRUCT, 1,
[struct mutex owner is a task_struct])
],[
AC_MSG_RESULT(no)
])
EXTRA_KCFLAGS="$tmp_flags"
])
dnl #
dnl # 2.6.18 API change,
dnl # First introduced 'mutex_lock_nested()' in include/linux/mutex.h,
dnl # as part of the mutex validator. Fallback to using 'mutex_lock()'
dnl # if the mutex validator is disabled or otherwise unavailable.
dnl #
AC_DEFUN([SPL_AC_MUTEX_LOCK_NESTED], [
AC_MSG_CHECKING([whether mutex_lock_nested() is available])
SPL_LINUX_TRY_COMPILE([
#include <linux/mutex.h>
],[
struct mutex mutex;
mutex_init(&mutex);
mutex_lock_nested(&mutex, 0);
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_MUTEX_LOCK_NESTED, 1,
[mutex_lock_nested() is available])
],[
AC_MSG_RESULT(no)
])
])
dnl #
dnl # 2.6.27 API change,
dnl # on_each_cpu() uses 3 args, no 'retry' argument
dnl #
AC_DEFUN([SPL_AC_3ARGS_ON_EACH_CPU], [
AC_MSG_CHECKING([whether on_each_cpu() wants 3 args])
SPL_LINUX_TRY_COMPILE([
#include <linux/smp.h>
],[
on_each_cpu(NULL, NULL, 0);
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_3ARGS_ON_EACH_CPU, 1,
[on_each_cpu wants 3 args])
],[
AC_MSG_RESULT(no)
])
])
dnl #
dnl # 2.6.18 API change,
dnl # kallsyms_lookup_name no longer exported
dnl #
AC_DEFUN([SPL_AC_KALLSYMS_LOOKUP_NAME], [
SPL_CHECK_SYMBOL_EXPORT(
[kallsyms_lookup_name],
[],
[AC_DEFINE(HAVE_KALLSYMS_LOOKUP_NAME, 1,
[kallsyms_lookup_name() is available])],
[])
])
dnl #
dnl # Proposed API change,
dnl # This symbol is not available in stock kernels. You may build a
dnl # custom kernel with the *-spl-export-symbols.patch which will export
dnl # these symbols for use. If your already rolling a custom kernel for
dnl # your environment this is recommended.
dnl #
AC_DEFUN([SPL_AC_GET_VMALLOC_INFO], [
SPL_CHECK_SYMBOL_EXPORT(
[get_vmalloc_info],
[],
[AC_DEFINE(HAVE_GET_VMALLOC_INFO, 1,
[get_vmalloc_info() is available])],
[])
])
dnl #
dnl # 2.6.17 API change
dnl # The helper functions first_online_pgdat(), next_online_pgdat(), and
dnl # next_zone() are introduced to simplify for_each_zone(). These symbols
dnl # were exported in 2.6.17 for use by modules which was consistent with
dnl # the previous implementation of for_each_zone(). From 2.6.18 - 2.6.19
dnl # the symbols were exported as 'unused', and by 2.6.20 they exports
dnl # were dropped entirely leaving modules no way to directly iterate over
dnl # the zone list. Because we need access to the zone helpers we check
dnl # if the kernel contains the old or new implementation. Then we check
dnl # to see if the symbols we need for each version are available. If they
dnl # are not, dynamically aquire the addresses with kallsyms_lookup_name().
dnl #
AC_DEFUN([SPL_AC_PGDAT_HELPERS], [
AC_MSG_CHECKING([whether symbol *_pgdat exist])
grep -q -E 'first_online_pgdat' $LINUX/include/linux/mmzone.h 2>/dev/null
rc=$?
if test $rc -eq 0; then
AC_MSG_RESULT([yes])
AC_DEFINE(HAVE_PGDAT_HELPERS, 1, [pgdat helpers are available])
else
AC_MSG_RESULT([no])
fi
])
dnl #
dnl # Proposed API change,
dnl # This symbol is not available in stock kernels. You may build a
dnl # custom kernel with the *-spl-export-symbols.patch which will export
dnl # these symbols for use. If your already rolling a custom kernel for
dnl # your environment this is recommended.
dnl #
AC_DEFUN([SPL_AC_FIRST_ONLINE_PGDAT], [
SPL_CHECK_SYMBOL_EXPORT(
[first_online_pgdat],
[],
[AC_DEFINE(HAVE_FIRST_ONLINE_PGDAT, 1,
[first_online_pgdat() is available])],
[])
])
dnl #
dnl # Proposed API change,
dnl # This symbol is not available in stock kernels. You may build a
dnl # custom kernel with the *-spl-export-symbols.patch which will export
dnl # these symbols for use. If your already rolling a custom kernel for
dnl # your environment this is recommended.
dnl #
AC_DEFUN([SPL_AC_NEXT_ONLINE_PGDAT], [
SPL_CHECK_SYMBOL_EXPORT(
[next_online_pgdat],
[],
[AC_DEFINE(HAVE_NEXT_ONLINE_PGDAT, 1,
[next_online_pgdat() is available])],
[])
])
dnl #
dnl # Proposed API change,
dnl # This symbol is not available in stock kernels. You may build a
dnl # custom kernel with the *-spl-export-symbols.patch which will export
dnl # these symbols for use. If your already rolling a custom kernel for
dnl # your environment this is recommended.
dnl #
AC_DEFUN([SPL_AC_NEXT_ZONE], [
SPL_CHECK_SYMBOL_EXPORT(
[next_zone],
[],
[AC_DEFINE(HAVE_NEXT_ZONE, 1,
[next_zone() is available])],
[])
])
dnl #
dnl # 2.6.17 API change,
dnl # See SPL_AC_PGDAT_HELPERS for details.
dnl #
AC_DEFUN([SPL_AC_PGDAT_LIST], [
SPL_CHECK_SYMBOL_EXPORT(
[pgdat_list],
[],
[AC_DEFINE(HAVE_PGDAT_LIST, 1,
[pgdat_list is available])],
[])
])
dnl #
dnl # 2.6.18 API change,
dnl # First introduced global_page_state() support as an inline.
dnl #
AC_DEFUN([SPL_AC_GLOBAL_PAGE_STATE], [
AC_MSG_CHECKING([whether global_page_state() is available])
SPL_LINUX_TRY_COMPILE([
#include <linux/mm.h>
],[
unsigned long state __attribute__ ((unused));
state = global_page_state(0);
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_GLOBAL_PAGE_STATE, 1,
[global_page_state() is available])
],[
AC_MSG_RESULT(no)
])
])
dnl #
dnl # 2.6.21 API change (plus subsequent naming convention changes),
dnl # Public global zone stats now include a free page count. However
dnl # the enumerated names of the counters have changed since this API
dnl # was introduced. We need to deduce the corrent name to use. This
dnl # replaces the priviate get_zone_counts() interface.
dnl #
dnl # NR_FREE_PAGES was available from 2.6.21 to current kernels, which
dnl # is 2.6.30 as of when this was written.
dnl #
AC_DEFUN([SPL_AC_ZONE_STAT_ITEM_FREE], [
AC_MSG_CHECKING([whether page state NR_FREE_PAGES is available])
SPL_LINUX_TRY_COMPILE([
#include <linux/mm.h>
],[
enum zone_stat_item zsi __attribute__ ((unused));
zsi = NR_FREE_PAGES;
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_FREE_PAGES, 1,
[Page state NR_FREE_PAGES is available])
],[
AC_MSG_RESULT(no)
])
])
dnl #
dnl # 2.6.21 API change (plus subsequent naming convention changes),
dnl # Public global zone stats now include an inactive page count. However
dnl # the enumerated names of the counters have changed since this API
dnl # was introduced. We need to deduce the corrent name to use. This
dnl # replaces the priviate get_zone_counts() interface.
dnl #
dnl # NR_INACTIVE was available from 2.6.21 to 2.6.27 and included both
dnl # anonymous and file inactive pages. As of 2.6.28 it was split in
dnl # to NR_INACTIVE_ANON and NR_INACTIVE_FILE.
dnl #
AC_DEFUN([SPL_AC_ZONE_STAT_ITEM_INACTIVE], [
AC_MSG_CHECKING([whether page state NR_INACTIVE is available])
SPL_LINUX_TRY_COMPILE([
#include <linux/mm.h>
],[
enum zone_stat_item zsi __attribute__ ((unused));
zsi = NR_INACTIVE;
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_INACTIVE, 1,
[Page state NR_INACTIVE is available])
],[
AC_MSG_RESULT(no)
])
AC_MSG_CHECKING([whether page state NR_INACTIVE_ANON is available])
SPL_LINUX_TRY_COMPILE([
#include <linux/mm.h>
],[
enum zone_stat_item zsi __attribute__ ((unused));
zsi = NR_INACTIVE_ANON;
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_ANON, 1,
[Page state NR_INACTIVE_ANON is available])
],[
AC_MSG_RESULT(no)
])
AC_MSG_CHECKING([whether page state NR_INACTIVE_FILE is available])
SPL_LINUX_TRY_COMPILE([
#include <linux/mm.h>
],[
enum zone_stat_item zsi __attribute__ ((unused));
zsi = NR_INACTIVE_FILE;
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_FILE, 1,
[Page state NR_INACTIVE_FILE is available])
],[
AC_MSG_RESULT(no)
])
])
dnl #
dnl # 2.6.21 API change (plus subsequent naming convention changes),
dnl # Public global zone stats now include an active page count. However
dnl # the enumerated names of the counters have changed since this API
dnl # was introduced. We need to deduce the corrent name to use. This
dnl # replaces the priviate get_zone_counts() interface.
dnl #
dnl # NR_ACTIVE was available from 2.6.21 to 2.6.27 and included both
dnl # anonymous and file active pages. As of 2.6.28 it was split in
dnl # to NR_ACTIVE_ANON and NR_ACTIVE_FILE.
dnl #
AC_DEFUN([SPL_AC_ZONE_STAT_ITEM_ACTIVE], [
AC_MSG_CHECKING([whether page state NR_ACTIVE is available])
SPL_LINUX_TRY_COMPILE([
#include <linux/mm.h>
],[
enum zone_stat_item zsi __attribute__ ((unused));
zsi = NR_ACTIVE;
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_ACTIVE, 1,
[Page state NR_ACTIVE is available])
],[
AC_MSG_RESULT(no)
])
AC_MSG_CHECKING([whether page state NR_ACTIVE_ANON is available])
SPL_LINUX_TRY_COMPILE([
#include <linux/mm.h>
],[
enum zone_stat_item zsi __attribute__ ((unused));
zsi = NR_ACTIVE_ANON;
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_ANON, 1,
[Page state NR_ACTIVE_ANON is available])
],[
AC_MSG_RESULT(no)
])
AC_MSG_CHECKING([whether page state NR_ACTIVE_FILE is available])
SPL_LINUX_TRY_COMPILE([
#include <linux/mm.h>
],[
enum zone_stat_item zsi __attribute__ ((unused));
zsi = NR_ACTIVE_FILE;
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_FILE, 1,
[Page state NR_ACTIVE_FILE is available])
],[
AC_MSG_RESULT(no)
])
])
dnl #
dnl # Proposed API change for legacy kernels.
dnl # This symbol is not available in older kernels. For kernels post
dnl # 2.6.21 the global_page_state() API is used to get free/inactive/active
dnl # page state information. This symbol is only used in legacy kernels
dnl # any only as a last resort.
dnl
AC_DEFUN([SPL_AC_GET_ZONE_COUNTS], [
AC_MSG_CHECKING([whether symbol get_zone_counts is needed])
SPL_LINUX_TRY_COMPILE([
],[
#if !defined(HAVE_ZONE_STAT_ITEM_NR_FREE_PAGES)
#error "global_page_state needs NR_FREE_PAGES"
#endif
#if !defined(HAVE_ZONE_STAT_ITEM_NR_ACTIVE) && \
!defined(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_ANON) && \
!defined(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_FILE)
#error "global_page_state needs NR_ACTIVE*"
#endif
#if !defined(HAVE_ZONE_STAT_ITEM_NR_INACTIVE) && \
!defined(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_ANON) && \
!defined(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_FILE)
#error "global_page_state needs NR_INACTIVE*"
#endif
],[
AC_MSG_RESULT(no)
],[
AC_MSG_RESULT(yes)
AC_DEFINE(NEED_GET_ZONE_COUNTS, 1,
[get_zone_counts() is needed])
SPL_CHECK_SYMBOL_EXPORT(
[get_zone_counts],
[],
[AC_DEFINE(HAVE_GET_ZONE_COUNTS, 1,
[get_zone_counts() is available])],
[])
])
])
dnl #
dnl # 2.6.27 API change,
dnl # The user_path_dir() replaces __user_walk()
dnl #
AC_DEFUN([SPL_AC_USER_PATH_DIR], [
SPL_CHECK_SYMBOL_EXPORT(
[user_path_at],
[],
[AC_DEFINE(HAVE_USER_PATH_DIR, 1,
[user_path_dir() is available])],
[])
])
dnl #
dnl # Symbol available in RHEL kernels not in stock kernels.
dnl #
AC_DEFUN([SPL_AC_SET_FS_PWD], [
SPL_CHECK_SYMBOL_EXPORT(
[set_fs_pwd],
[],
[AC_DEFINE(HAVE_SET_FS_PWD, 1,
[set_fs_pwd() is available])],
[])
])
dnl #
dnl # 2.6.25 API change,
dnl # Simplied API by replacing mnt+dentry args with a single path arg.
dnl #
AC_DEFUN([SPL_AC_2ARGS_SET_FS_PWD],
[AC_MSG_CHECKING([whether set_fs_pwd() wants 2 args])
SPL_LINUX_TRY_COMPILE([
#include <linux/sched.h>
#include <linux/fs_struct.h>
],[
set_fs_pwd(NULL, NULL);
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_2ARGS_SET_FS_PWD, 1,
[set_fs_pwd() wants 2 args])
],[
AC_MSG_RESULT(no)
])
])
dnl #
dnl # SLES API change, never adopted in mainline,
dnl # Third 'struct vfsmount *' argument removed.
dnl #
AC_DEFUN([SPL_AC_2ARGS_VFS_UNLINK],
[AC_MSG_CHECKING([whether vfs_unlink() wants 2 args])
SPL_LINUX_TRY_COMPILE([
#include <linux/fs.h>
],[
vfs_unlink(NULL, NULL);
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_2ARGS_VFS_UNLINK, 1,
[vfs_unlink() wants 2 args])
],[
AC_MSG_RESULT(no)
])
])
dnl #
dnl # SLES API change, never adopted in mainline,
dnl # Third and sixth 'struct vfsmount *' argument removed.
dnl #
AC_DEFUN([SPL_AC_4ARGS_VFS_RENAME],
[AC_MSG_CHECKING([whether vfs_rename() wants 4 args])
SPL_LINUX_TRY_COMPILE([
#include <linux/fs.h>
],[
vfs_rename(NULL, NULL, NULL, NULL);
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_4ARGS_VFS_RENAME, 1,
[vfs_rename() wants 4 args])
],[
AC_MSG_RESULT(no)
])
])
dnl #
dnl # 2.6.36 API change,
dnl # The 'struct fs_struct->lock' was changed from a rwlock_t to
dnl # a spinlock_t to improve the fastpath performance.
dnl #
AC_DEFUN([SPL_AC_FS_STRUCT_SPINLOCK], [
AC_MSG_CHECKING([whether struct fs_struct uses spinlock_t])
tmp_flags="$EXTRA_KCFLAGS"
EXTRA_KCFLAGS="-Werror"
SPL_LINUX_TRY_COMPILE([
#include <linux/sched.h>
#include <linux/fs_struct.h>
],[
struct fs_struct fs;
spin_lock_init(&fs.lock);
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_FS_STRUCT_SPINLOCK, 1,
[struct fs_struct uses spinlock_t])
],[
AC_MSG_RESULT(no)
])
EXTRA_KCFLAGS="$tmp_flags"
])
dnl #
dnl # 2.6.29 API change,
dnl # check whether 'struct cred' exists
dnl #
AC_DEFUN([SPL_AC_CRED_STRUCT], [
AC_MSG_CHECKING([whether struct cred exists])
SPL_LINUX_TRY_COMPILE([
#include <linux/cred.h>
],[
struct cred *cr __attribute__ ((unused));
cr = NULL;
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_CRED_STRUCT, 1, [struct cred exists])
],[
AC_MSG_RESULT(no)
])
])
dnl #
dnl # Custom SPL patch may export this symbol.
dnl #
AC_DEFUN([SPL_AC_GROUPS_SEARCH], [
SPL_CHECK_SYMBOL_EXPORT(
[groups_search],
[],
[AC_DEFINE(HAVE_GROUPS_SEARCH, 1,
[groups_search() is available])],
[])
])
dnl #
dnl # 2.6.x API change,
dnl # __put_task_struct() was exported in RHEL5 but unavailable elsewhere.
dnl #
AC_DEFUN([SPL_AC_PUT_TASK_STRUCT], [
SPL_CHECK_SYMBOL_EXPORT(
[__put_task_struct],
[],
[AC_DEFINE(HAVE_PUT_TASK_STRUCT, 1,
[__put_task_struct() is available])],
[])
])
dnl #
dnl # 2.6.32 API change,
dnl # Unused 'struct file *' removed from prototype.
dnl #
AC_DEFUN([SPL_AC_5ARGS_PROC_HANDLER], [
AC_MSG_CHECKING([whether proc_handler() wants 5 args])
SPL_LINUX_TRY_COMPILE([
#include <linux/sysctl.h>
],[
proc_dostring(NULL, 0, NULL, NULL, NULL);
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_5ARGS_PROC_HANDLER, 1,
[proc_handler() wants 5 args])
],[
AC_MSG_RESULT(no)
])
])
dnl #
dnl # 2.6.x API change,
dnl # kvasprintf() function added.
dnl #
AC_DEFUN([SPL_AC_KVASPRINTF], [
SPL_CHECK_SYMBOL_EXPORT(
[kvasprintf],
[],
[AC_DEFINE(HAVE_KVASPRINTF, 1,
[kvasprintf() is available])],
[])
])
dnl #
dnl # 2.6.29 API change,
dnl # vfs_fsync() funcation added, prior to this use file_fsync().
dnl #
AC_DEFUN([SPL_AC_VFS_FSYNC], [
SPL_CHECK_SYMBOL_EXPORT(
[vfs_fsync],
[fs/sync.c],
[AC_DEFINE(HAVE_VFS_FSYNC, 1, [vfs_fsync() is available])],
[])
])
dnl #
dnl # 2.6.35 API change,
dnl # Unused 'struct dentry *' removed from vfs_fsync() prototype.
dnl #
AC_DEFUN([SPL_AC_2ARGS_VFS_FSYNC], [
AC_MSG_CHECKING([whether vfs_fsync() wants 2 args])
SPL_LINUX_TRY_COMPILE([
#include <linux/fs.h>
],[
vfs_fsync(NULL, 0);
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_2ARGS_VFS_FSYNC, 1, [vfs_fsync() wants 2 args])
],[
AC_MSG_RESULT(no)
])
])
dnl #
dnl # 2.6.33 API change. Also backported in RHEL5 as of 2.6.18-190.el5.
dnl # Earlier versions of rwsem_is_locked() were inline and had a race
dnl # condition. The fixed version is exported as a symbol. The race
dnl # condition is fixed by acquiring sem->wait_lock, so we must not
dnl # call that version while holding sem->wait_lock.
dnl #
AC_DEFUN([SPL_AC_EXPORTED_RWSEM_IS_LOCKED], [
SPL_CHECK_SYMBOL_EXPORT(
[rwsem_is_locked],
[lib/rwsem-spinlock.c],
[AC_DEFINE(RWSEM_IS_LOCKED_TAKES_WAIT_LOCK, 1,
[rwsem_is_locked() acquires sem->wait_lock])],
[])
])
dnl #
dnl # 2.6.37 API compat,
dnl # The function invalidate_inodes() is no longer exported by the kernel.
dnl # The prototype however is still available which means it is safe
dnl # to acquire the symbol's address using spl_kallsyms_lookup_name().
dnl #
dnl # The Proxmox VE kernel contains a patch which renames the function
dnl # invalidate_inodes() to invalidate_inodes_check(). In the process
dnl # it adds a 'check' argument and a '#define invalidate_inodes(x)'
dnl # compatibility wrapper for legacy callers. Therefore, if either
dnl # of these functions are exported invalidate_inodes() can be
dnl # safely used.
dnl #
AC_DEFUN([SPL_AC_KERNEL_INVALIDATE_INODES], [
SPL_CHECK_SYMBOL_EXPORT(
[invalidate_inodes],
[],
[AC_DEFINE(HAVE_INVALIDATE_INODES, 1,
[invalidate_inodes() is available])],
[])
SPL_CHECK_SYMBOL_EXPORT(
[invalidate_inodes_check],
[],
[AC_DEFINE(HAVE_INVALIDATE_INODES_CHECK, 1,
[invalidate_inodes_check() is available])],
[])
])
dnl #
dnl # 2.6.39 API compat,
dnl # The function invalidate_inodes() now take 2 arguments. The second
dnl # 'kill_dirty' argument describes how invalidate_inodes() should
dnl # handle dirty inodes. Only when set will dirty inodes be discarded,
dnl # otherwise they will be handled as busy.
dnl #
dnl # Unfortunately, we don't have access to the invalidate_inodes()
dnl # prototype so it's not easy to check how many arguments it takes.
dnl # However, this change was done for the benefit of invalidate_device()
dnl # which also added an argument. The invalidate_device() symbol does
dnl # exist in the development headers so if it takes two arguments we
dnl # can fairly safely infer that invalidate_inodes() takes two arguments
dnl # as well. See commit 93b270f76e7ef3b81001576860c2701931cdc78b.
dnl #
AC_DEFUN([SPL_AC_KERNEL_2ARGS_INVALIDATE_INODES],
[AC_MSG_CHECKING([whether invalidate_inodes() wants 2 args])
SPL_LINUX_TRY_COMPILE([
#include <linux/fs.h>
],[
return __invalidate_device(NULL, 0);
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_2ARGS_INVALIDATE_INODES, 1,
[invalidate_inodes() wants 2 args])
],[
AC_MSG_RESULT(no)
])
])
dnl #
dnl # 2.6.xx API compat,
dnl # There currently exists no exposed API to partially shrink the dcache.
dnl # The expected mechanism to shrink the cache is a registered shrinker
dnl # which is called during memory pressure.
dnl #
AC_DEFUN([SPL_AC_SHRINK_DCACHE_MEMORY], [
SPL_CHECK_SYMBOL_EXPORT(
[shrink_dcache_memory],
[fs/dcache.c],
[AC_DEFINE(HAVE_SHRINK_DCACHE_MEMORY, 1,
[shrink_dcache_memory() is available])],
[])
])
dnl #
dnl # 2.6.xx API compat,
dnl # There currently exists no exposed API to partially shrink the icache.
dnl # The expected mechanism to shrink the cache is a registered shrinker
dnl # which is called during memory pressure.
dnl #
AC_DEFUN([SPL_AC_SHRINK_ICACHE_MEMORY], [
SPL_CHECK_SYMBOL_EXPORT(
[shrink_icache_memory],
[fs/inode.c],
[AC_DEFINE(HAVE_SHRINK_ICACHE_MEMORY, 1,
[shrink_icache_memory() is available])],
[])
])
dnl #
dnl # 2.6.39 API compat,
dnl # The path_lookup() function has been renamed to kern_path_parent()
dnl # and the flags argument has been removed. The only behavior now
dnl # offered is that of LOOKUP_PARENT. The spl already always passed
dnl # this flag so dropping the flag does not impact us.
dnl #
AC_DEFUN([SPL_AC_KERN_PATH_PARENT_HEADER], [
SPL_CHECK_SYMBOL_HEADER(
[kern_path_parent],
[int kern_path_parent(const char \*, struct nameidata \*)],
[include/linux/namei.h],
[AC_DEFINE(HAVE_KERN_PATH_PARENT_HEADER, 1,
[kern_path_parent() is available])],
[])
])
dnl #
dnl # 3.1 API compat,
dnl # The kern_path_parent() symbol is no longer exported by the kernel.
dnl # However, it remains the prefered interface and since we still have
dnl # access to the prototype we dynamically lookup the required address.
dnl #
AC_DEFUN([SPL_AC_KERN_PATH_PARENT_SYMBOL], [
SPL_CHECK_SYMBOL_EXPORT(
[kern_path_parent],
[fs/namei.c],
[AC_DEFINE(HAVE_KERN_PATH_PARENT_SYMBOL, 1,
[kern_path_parent() is available])],
[])
])
dnl #
dnl # 2.6.39 API compat,
dnl # The function zlib_deflate_workspacesize() now take 2 arguments.
dnl # This was done to avoid always having to allocate the maximum size
dnl # workspace (268K). The caller can now specific the windowBits and
dnl # memLevel compression parameters to get a smaller workspace.
dnl #
AC_DEFUN([SPL_AC_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE],
[AC_MSG_CHECKING([whether zlib_deflate_workspacesize() wants 2 args])
SPL_LINUX_TRY_COMPILE([
#include <linux/zlib.h>
],[
return zlib_deflate_workspacesize(MAX_WBITS, MAX_MEM_LEVEL);
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE, 1,
[zlib_deflate_workspacesize() wants 2 args])
],[
AC_MSG_RESULT(no)
])
])
dnl #
dnl # 2.6.39 API change,
dnl # Shrinker adjust to use common shrink_control structure.
dnl #
AC_DEFUN([SPL_AC_SHRINK_CONTROL_STRUCT], [
AC_MSG_CHECKING([whether struct shrink_control exists])
SPL_LINUX_TRY_COMPILE([
#include <linux/mm.h>
],[
struct shrink_control sc __attribute__ ((unused));
sc.nr_to_scan = 0;
sc.gfp_mask = GFP_KERNEL;
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_SHRINK_CONTROL_STRUCT, 1,
[struct shrink_control exists])
],[
AC_MSG_RESULT(no)
])
])
dnl #
dnl # 3.1 API Change
dnl #
dnl # The rw_semaphore.wait_lock member was changed from spinlock_t to
dnl # raw_spinlock_t at commit ddb6c9b58a19edcfac93ac670b066c836ff729f1.
dnl #
AC_DEFUN([SPL_AC_RWSEM_SPINLOCK_IS_RAW], [
AC_MSG_CHECKING([whether struct rw_semaphore member wait_lock is raw])
tmp_flags="$EXTRA_KCFLAGS"
EXTRA_KCFLAGS="-Werror"
SPL_LINUX_TRY_COMPILE([
#include <linux/rwsem.h>
],[
struct rw_semaphore dummy_semaphore __attribute__ ((unused));
raw_spinlock_t dummy_lock __attribute__ ((unused));
dummy_semaphore.wait_lock = dummy_lock;
],[
AC_MSG_RESULT(yes)
AC_DEFINE(RWSEM_SPINLOCK_IS_RAW, 1,
[struct rw_semaphore member wait_lock is raw_spinlock_t])
],[
AC_MSG_RESULT(no)
])
EXTRA_KCFLAGS="$tmp_flags"
])
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