[mirror_zfs.git] / config / kernel.m4

dnl #
dnl # Default ZFS kernel configuration 
dnl #
AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
	ZFS_AC_KERNEL
	ZFS_AC_SPL
	ZFS_AC_KERNEL_CONFIG
	ZFS_AC_KERNEL_BDEV_BLOCK_DEVICE_OPERATIONS
	ZFS_AC_KERNEL_TYPE_FMODE_T
	ZFS_AC_KERNEL_KOBJ_NAME_LEN
	ZFS_AC_KERNEL_BLKDEV_GET_BY_PATH
	ZFS_AC_KERNEL_OPEN_BDEV_EXCLUSIVE
	ZFS_AC_KERNEL_INVALIDATE_BDEV_ARGS
	ZFS_AC_KERNEL_BDEV_LOGICAL_BLOCK_SIZE
	ZFS_AC_KERNEL_BIO_EMPTY_BARRIER
	ZFS_AC_KERNEL_BIO_FAILFAST
	ZFS_AC_KERNEL_BIO_FAILFAST_DTD
	ZFS_AC_KERNEL_REQ_FAILFAST_MASK
	ZFS_AC_KERNEL_BIO_END_IO_T_ARGS
	ZFS_AC_KERNEL_BIO_RW_SYNC
	ZFS_AC_KERNEL_BIO_RW_SYNCIO
	ZFS_AC_KERNEL_REQ_SYNC
	ZFS_AC_KERNEL_BLK_END_REQUEST
	ZFS_AC_KERNEL_BLK_FETCH_REQUEST
	ZFS_AC_KERNEL_BLK_REQUEUE_REQUEST
	ZFS_AC_KERNEL_BLK_RQ_BYTES
	ZFS_AC_KERNEL_BLK_RQ_POS
	ZFS_AC_KERNEL_BLK_RQ_SECTORS
	ZFS_AC_KERNEL_GET_DISK_RO
	ZFS_AC_KERNEL_RQ_IS_SYNC
	ZFS_AC_KERNEL_RQ_FOR_EACH_SEGMENT
	ZFS_AC_KERNEL_CONST_XATTR_HANDLER
	ZFS_AC_KERNEL_XATTR_HANDLER_GET
	ZFS_AC_KERNEL_XATTR_HANDLER_SET
	ZFS_AC_KERNEL_FSYNC_2ARGS
	ZFS_AC_KERNEL_EVICT_INODE
	ZFS_AC_KERNEL_INSERT_INODE_LOCKED
	ZFS_AC_KERNEL_D_OBTAIN_ALIAS
	ZFS_AC_KERNEL_CHECK_DISK_SIZE_CHANGE
	ZFS_AC_KERNEL_TRUNCATE_SETSIZE
	ZFS_AC_KERNEL_6ARGS_SECURITY_INODE_INIT_SECURITY

	if test "$LINUX_OBJ" != "$LINUX"; then
		KERNELMAKE_PARAMS="$KERNELMAKE_PARAMS O=$LINUX_OBJ"
	fi
	AC_SUBST(KERNELMAKE_PARAMS)


	dnl # -Wall -fno-strict-aliasing -Wstrict-prototypes and other
	dnl # compiler options are added by the kernel build system.
	KERNELCPPFLAGS="$KERNELCPPFLAGS $NO_UNUSED_BUT_SET_VARIABLE"
	KERNELCPPFLAGS="$KERNELCPPFLAGS -DHAVE_SPL -D_KERNEL"
	KERNELCPPFLAGS="$KERNELCPPFLAGS -DTEXT_DOMAIN=\\\"zfs-linux-kernel\\\""

	AC_SUBST(KERNELCPPFLAGS)
])

dnl #
dnl # Detect name used for Module.symvers file in kernel
dnl #
AC_DEFUN([ZFS_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)
])

dnl #
dnl # Detect the kernel to be built against
dnl #
AC_DEFUN([ZFS_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)

	ZFS_AC_MODULE_SYMVERS
])

dnl #
dnl # Detect name used for the additional SPL Module.symvers file.  If one
dnl # does not exist this is likely because the SPL has been configured
dnl # but not built.  To allow recursive builds a good guess is made as to
dnl # what this file will be named based on what it is named in the kernel
dnl # build products.  This file will first be used at link time so if
dnl # the guess is wrong the build will fail then.  This unfortunately
dnl # means the ZFS package does not contain a reliable mechanism to
dnl # detect symbols exported by the SPL at configure time.
dnl #
AC_DEFUN([ZFS_AC_SPL_MODULE_SYMVERS], [
	AC_MSG_CHECKING([spl file name for module symbols])
	if test -r $SPL_OBJ/Module.symvers; then
		SPL_SYMBOLS=Module.symvers
	elif test -r $SPL_OBJ/Modules.symvers; then
		SPL_SYMBOLS=Modules.symvers
	elif test -r $SPL_OBJ/module/Module.symvers; then
		SPL_SYMBOLS=Module.symvers
	elif test -r $SPL_OBJ/module/Modules.symvers; then
		SPL_SYMBOLS=Modules.symvers
	else
		SPL_SYMBOLS=$LINUX_SYMBOLS
	fi

	AC_MSG_RESULT([$SPL_SYMBOLS])
	AC_SUBST(SPL_SYMBOLS)
])

dnl #
dnl # Detect the SPL module to be built against
dnl #
AC_DEFUN([ZFS_AC_SPL], [
	AC_ARG_WITH([spl],
		AS_HELP_STRING([--with-spl=PATH],
		[Path to spl source]),
		[splsrc="$withval"])

	AC_ARG_WITH([spl-obj],
		AS_HELP_STRING([--with-spl-obj=PATH],
		[Path to spl build objects]),
		[splbuild="$withval"])


	AC_MSG_CHECKING([spl source directory])
	if test -z "$splsrc"; then
		sourcelink=`ls -1d /usr/src/spl-*/${LINUX_VERSION} \
		            2>/dev/null | tail -1`

		if test -z "$sourcelink" || test ! -e $sourcelink; then
			sourcelink=../spl
		fi

		if test -e $sourcelink; then
			splsrc=`readlink -f ${sourcelink}`
		else
			AC_MSG_RESULT([Not found])
			AC_MSG_ERROR([
	*** Please make sure the spl devel package for your distribution
	*** is installed then try again.  If that fails you can specify the
	*** location of the spl source with the '--with-spl=PATH' option.])
		fi
	else
		if test "$splsrc" = "NONE"; then
			splbuild=NONE
			splsrcver=NONE
		fi
	fi

	AC_MSG_RESULT([$splsrc])
	AC_MSG_CHECKING([spl build directory])
	if test -z "$splbuild"; then
		splbuild=${splsrc}
	fi
	AC_MSG_RESULT([$splbuild])

	AC_MSG_CHECKING([spl source version])
	if test -r $splbuild/spl_config.h &&
		fgrep -q SPL_META_VERSION $splbuild/spl_config.h; then

		splsrcver=`(echo "#include <spl_config.h>";
		            echo "splsrcver=SPL_META_VERSION") |
		            cpp -I $splbuild |
		            grep "^splsrcver=" | cut -d \" -f 2`
	fi

	if test -z "$splsrcver"; then
		AC_MSG_RESULT([Not found])
		AC_MSG_ERROR([
		*** Cannot determine the version of the spl source.
		*** Please prepare the spl source before running this script])
	fi

	AC_MSG_RESULT([$splsrcver])

	SPL=${splsrc}
	SPL_OBJ=${splbuild}
	SPL_VERSION=${splsrcver}

	AC_SUBST(SPL)
	AC_SUBST(SPL_OBJ)
	AC_SUBST(SPL_VERSION)

	ZFS_AC_SPL_MODULE_SYMVERS
])

dnl #
dnl # Certain kernel build options are not supported.  These must be
dnl # detected at configure time and cause a build failure.  Otherwise
dnl # modules may be successfully built that behave incorrectly.
dnl #
dnl # CONFIG_PREEMPT - Preempt kernels require special handling.
dnl #
dnl # There are certain kernel build options which when enabled are
dnl # completely incompatible with non GPL kernel modules.  It is best
dnl # to detect these at configure time and fail with a clear error
dnl # rather than build everything and fail during linking.
dnl #
dnl # CONFIG_DEBUG_LOCK_ALLOC - Maps mutex_lock() to mutex_lock_nested()
dnl #
AC_DEFUN([ZFS_AC_KERNEL_CONFIG], [

	ZFS_LINUX_CONFIG([PREEMPT],
		AC_MSG_ERROR([
		*** Kernel built with CONFIG_PREEMPT which is not supported.
		** You must rebuild your kernel without this option.]), [])

	if test "$ZFS_META_LICENSE" = CDDL; then
		ZFS_LINUX_CONFIG([DEBUG_LOCK_ALLOC],
		AC_MSG_ERROR([
		*** Kernel built with CONFIG_DEBUG_LOCK_ALLOC which is
		*** incompatible with the CDDL license.  You must rebuild
		*** your kernel without this option.]), [])
	fi

	if test "$ZFS_META_LICENSE" = GPL; then
		AC_DEFINE([HAVE_GPL_ONLY_SYMBOLS], [1],
			[Define to 1 if licensed under the GPL])
	fi
])

dnl #
dnl # ZFS_LINUX_CONFTEST
dnl #
AC_DEFUN([ZFS_LINUX_CONFTEST], [
cat confdefs.h - <<_ACEOF >conftest.c
$1
_ACEOF
])

dnl #
dnl # ZFS_LANG_PROGRAM(C)([PROLOGUE], [BODY])
dnl #
m4_define([ZFS_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 # ZFS_LINUX_COMPILE_IFELSE / like AC_COMPILE_IFELSE
dnl #
AC_DEFUN([ZFS_LINUX_COMPILE_IFELSE], [
	m4_ifvaln([$1], [ZFS_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 # ZFS_LINUX_TRY_COMPILE like AC_TRY_COMPILE
dnl #
AC_DEFUN([ZFS_LINUX_TRY_COMPILE],
	[ZFS_LINUX_COMPILE_IFELSE(
	[AC_LANG_SOURCE([ZFS_LANG_PROGRAM([[$1]], [[$2]])])],
	[modules],
	[test -s build/conftest.o],
	[$3], [$4])
])

dnl #
dnl # ZFS_LINUX_CONFIG
dnl #
AC_DEFUN([ZFS_LINUX_CONFIG],
	[AC_MSG_CHECKING([whether Linux was built with CONFIG_$1])
	ZFS_LINUX_TRY_COMPILE([
		#ifndef AUTOCONF_INCLUDED
		#include <linux/config.h>
		#endif
	],[
		#ifndef CONFIG_$1
		#error CONFIG_$1 not #defined
		#endif
	],[
		AC_MSG_RESULT([yes])
		$2
	],[
		AC_MSG_RESULT([no])
		$3
	])
])

dnl #
dnl # ZFS_CHECK_SYMBOL_EXPORT
dnl # check symbol exported or not
dnl #
AC_DEFUN([ZFS_CHECK_SYMBOL_EXPORT],
	[AC_MSG_CHECKING([whether symbol $1 is exported])
	grep -q -E '[[[:space:]]]$1[[[:space:]]]' \
		$LINUX_OBJ/$LINUX_SYMBOLS 2>/dev/null
	rc=$?
	if test $rc -ne 0; then
		export=0
		for file in $2; do
			grep -q -E "EXPORT_SYMBOL.*($1)" "$LINUX/$file" 2>/dev/null
			rc=$?
		        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])
		$3
	fi
])
Commit	Line	Data
c9c0d073 BB	1	dnl #
	2	dnl # Default ZFS kernel configuration
	3	dnl #
	4	AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
	5	ZFS_AC_KERNEL
	6	ZFS_AC_SPL
	7	ZFS_AC_KERNEL_CONFIG
	8	ZFS_AC_KERNEL_BDEV_BLOCK_DEVICE_OPERATIONS
	9	ZFS_AC_KERNEL_TYPE_FMODE_T
	10	ZFS_AC_KERNEL_KOBJ_NAME_LEN
45066d1f	11	ZFS_AC_KERNEL_BLKDEV_GET_BY_PATH
c9c0d073 BB	12	ZFS_AC_KERNEL_OPEN_BDEV_EXCLUSIVE
	13	ZFS_AC_KERNEL_INVALIDATE_BDEV_ARGS
	14	ZFS_AC_KERNEL_BDEV_LOGICAL_BLOCK_SIZE
	15	ZFS_AC_KERNEL_BIO_EMPTY_BARRIER
2959d94a	16	ZFS_AC_KERNEL_BIO_FAILFAST
f4af6bb7 BB	17	ZFS_AC_KERNEL_BIO_FAILFAST_DTD
f4af6bb7 BB	18	ZFS_AC_KERNEL_REQ_FAILFAST_MASK
c9c0d073	19	ZFS_AC_KERNEL_BIO_END_IO_T_ARGS
675de5aa	20	ZFS_AC_KERNEL_BIO_RW_SYNC
c9c0d073	21	ZFS_AC_KERNEL_BIO_RW_SYNCIO
675de5aa	22	ZFS_AC_KERNEL_REQ_SYNC
c9c0d073 BB	23	ZFS_AC_KERNEL_BLK_END_REQUEST
	24	ZFS_AC_KERNEL_BLK_FETCH_REQUEST
	25	ZFS_AC_KERNEL_BLK_REQUEUE_REQUEST
	26	ZFS_AC_KERNEL_BLK_RQ_BYTES
	27	ZFS_AC_KERNEL_BLK_RQ_POS
	28	ZFS_AC_KERNEL_BLK_RQ_SECTORS
	29	ZFS_AC_KERNEL_GET_DISK_RO
	30	ZFS_AC_KERNEL_RQ_IS_SYNC
	31	ZFS_AC_KERNEL_RQ_FOR_EACH_SEGMENT
777d4af8	32	ZFS_AC_KERNEL_CONST_XATTR_HANDLER
f9637c6c BB	33	ZFS_AC_KERNEL_XATTR_HANDLER_GET
f9637c6c BB	34	ZFS_AC_KERNEL_XATTR_HANDLER_SET
7268e1be	35	ZFS_AC_KERNEL_FSYNC_2ARGS
2c395def	36	ZFS_AC_KERNEL_EVICT_INODE
bdf4328b	37	ZFS_AC_KERNEL_INSERT_INODE_LOCKED
055656d4	38	ZFS_AC_KERNEL_D_OBTAIN_ALIAS
df554c14	39	ZFS_AC_KERNEL_CHECK_DISK_SIZE_CHANGE
b3129792	40	ZFS_AC_KERNEL_TRUNCATE_SETSIZE
5c03efc3	41	ZFS_AC_KERNEL_6ARGS_SECURITY_INODE_INIT_SECURITY
c9c0d073	42
6283f55e BB	43	if test "$LINUX_OBJ" != "$LINUX"; then
	44	KERNELMAKE_PARAMS="$KERNELMAKE_PARAMS O=$LINUX_OBJ"
	45	fi
	46	AC_SUBST(KERNELMAKE_PARAMS)
	47
	48
c9c0d073 BB	49	dnl # -Wall -fno-strict-aliasing -Wstrict-prototypes and other
c9c0d073 BB	50	dnl # compiler options are added by the kernel build system.
8a7e1cee	51	KERNELCPPFLAGS="$KERNELCPPFLAGS $NO_UNUSED_BUT_SET_VARIABLE"
c9c0d073 BB	52	KERNELCPPFLAGS="$KERNELCPPFLAGS -DHAVE_SPL -D_KERNEL"
c9c0d073 BB	53	KERNELCPPFLAGS="$KERNELCPPFLAGS -DTEXT_DOMAIN=\\\"zfs-linux-kernel\\\""
c9c0d073	54
c9c0d073 BB	55	AC_SUBST(KERNELCPPFLAGS)
	56	])
	57
	58	dnl #
	59	dnl # Detect name used for Module.symvers file in kernel
	60	dnl #
	61	AC_DEFUN([ZFS_AC_MODULE_SYMVERS], [
	62	modpost=$LINUX/scripts/Makefile.modpost
	63	AC_MSG_CHECKING([kernel file name for module symbols])
	64	if test -f "$modpost"; then
	65	if grep -q Modules.symvers $modpost; then
	66	LINUX_SYMBOLS=Modules.symvers
	67	else
	68	LINUX_SYMBOLS=Module.symvers
	69	fi
a60b1c0a BB	70
	71	if ! test -f "$LINUX_OBJ/$LINUX_SYMBOLS"; then
	72	AC_MSG_ERROR([
	73	*** Please make sure the kernel devel package for your distribution
	74	*** is installed. If your building with a custom kernel make sure the
	75	*** kernel is configured, built, and the '--with-linux=PATH' configure
	76	*** option refers to the location of the kernel source.])
	77	fi
c9c0d073 BB	78	else
	79	LINUX_SYMBOLS=NONE
	80	fi
	81	AC_MSG_RESULT($LINUX_SYMBOLS)
	82	AC_SUBST(LINUX_SYMBOLS)
	83	])
	84
	85	dnl #
	86	dnl # Detect the kernel to be built against
	87	dnl #
	88	AC_DEFUN([ZFS_AC_KERNEL], [
	89	AC_ARG_WITH([linux],
	90	AS_HELP_STRING([--with-linux=PATH],
	91	[Path to kernel source]),
	92	[kernelsrc="$withval"])
	93
	94	AC_ARG_WITH(linux-obj,
	95	AS_HELP_STRING([--with-linux-obj=PATH],
	96	[Path to kernel build objects]),
	97	[kernelbuild="$withval"])
	98
	99	AC_MSG_CHECKING([kernel source directory])
	100	if test -z "$kernelsrc"; then
1b94c25c BB	101	if test -e "/lib/modules/$(uname -r)/source"; then
	102	headersdir="/lib/modules/$(uname -r)/source"
	103	sourcelink=$(readlink -f "$headersdir")
	104	elif test -e "/lib/modules/$(uname -r)/build"; then
	105	headersdir="/lib/modules/$(uname -r)/build"
c9c0d073 BB	106	sourcelink=$(readlink -f "$headersdir")
	107	else
	108	sourcelink=$(ls -1d /usr/src/kernels/* \
	109	/usr/src/linux-* \
	110	2>/dev/null \| grep -v obj \| tail -1)
	111	fi
	112
	113	if test -n "$sourcelink" && test -e ${sourcelink}; then
	114	kernelsrc=`readlink -f ${sourcelink}`
	115	else
	116	AC_MSG_RESULT([Not found])
	117	AC_MSG_ERROR([
	118	*** Please make sure the kernel devel package for your distribution
	119	*** is installed then try again. If that fails you can specify the
	120	*** location of the kernel source with the '--with-linux=PATH' option.])
	121	fi
	122	else
	123	if test "$kernelsrc" = "NONE"; then
	124	kernsrcver=NONE
	125	fi
	126	fi
	127
	128	AC_MSG_RESULT([$kernelsrc])
	129	AC_MSG_CHECKING([kernel build directory])
	130	if test -z "$kernelbuild"; then
1b94c25c BB	131	if test -e "/lib/modules/$(uname -r)/build"; then
	132	kernelbuild=`readlink -f /lib/modules/$(uname -r)/build`
	133	elif test -d ${kernelsrc}-obj/${target_cpu}/${target_cpu}; then
c9c0d073 BB	134	kernelbuild=${kernelsrc}-obj/${target_cpu}/${target_cpu}
	135	elif test -d ${kernelsrc}-obj/${target_cpu}/default; then
	136	kernelbuild=${kernelsrc}-obj/${target_cpu}/default
	137	elif test -d `dirname ${kernelsrc}`/build-${target_cpu}; then
	138	kernelbuild=`dirname ${kernelsrc}`/build-${target_cpu}
	139	else
	140	kernelbuild=${kernelsrc}
	141	fi
	142	fi
	143	AC_MSG_RESULT([$kernelbuild])
	144
	145	AC_MSG_CHECKING([kernel source version])
	146	utsrelease1=$kernelbuild/include/linux/version.h
	147	utsrelease2=$kernelbuild/include/linux/utsrelease.h
	148	utsrelease3=$kernelbuild/include/generated/utsrelease.h
	149	if test -r $utsrelease1 && fgrep -q UTS_RELEASE $utsrelease1; then
	150	utsrelease=linux/version.h
	151	elif test -r $utsrelease2 && fgrep -q UTS_RELEASE $utsrelease2; then
	152	utsrelease=linux/utsrelease.h
	153	elif test -r $utsrelease3 && fgrep -q UTS_RELEASE $utsrelease3; then
	154	utsrelease=generated/utsrelease.h
	155	fi
	156
	157	if test "$utsrelease"; then
	158	kernsrcver=`(echo "#include <$utsrelease>";
	159	echo "kernsrcver=UTS_RELEASE") \|
	160	cpp -I $kernelbuild/include \|
	161	grep "^kernsrcver=" \| cut -d \" -f 2`
	162
	163	if test -z "$kernsrcver"; then
	164	AC_MSG_RESULT([Not found])
	165	AC_MSG_ERROR([*** Cannot determine kernel version.])
	166	fi
	167	else
	168	AC_MSG_RESULT([Not found])
	169	AC_MSG_ERROR([*** Cannot find UTS_RELEASE definition.])
	170	fi
	171
	172	AC_MSG_RESULT([$kernsrcver])
	173
	174	LINUX=${kernelsrc}
	175	LINUX_OBJ=${kernelbuild}
	176	LINUX_VERSION=${kernsrcver}
	177
	178	AC_SUBST(LINUX)
	179	AC_SUBST(LINUX_OBJ)
	180	AC_SUBST(LINUX_VERSION)
	181
	182	ZFS_AC_MODULE_SYMVERS
	183	])
	184
	185	dnl #
	186	dnl # Detect name used for the additional SPL Module.symvers file. If one
	187	dnl # does not exist this is likely because the SPL has been configured
	188	dnl # but not built. To allow recursive builds a good guess is made as to
	189	dnl # what this file will be named based on what it is named in the kernel
	190	dnl # build products. This file will first be used at link time so if
	191	dnl # the guess is wrong the build will fail then. This unfortunately
	192	dnl # means the ZFS package does not contain a reliable mechanism to
	193	dnl # detect symbols exported by the SPL at configure time.
	194	dnl #
	195	AC_DEFUN([ZFS_AC_SPL_MODULE_SYMVERS], [
	196	AC_MSG_CHECKING([spl file name for module symbols])
	197	if test -r $SPL_OBJ/Module.symvers; then
198	SPL_SYMBOLS=Module.symvers
199	elif test -r $SPL_OBJ/Modules.symvers; then
200	SPL_SYMBOLS=Modules.symvers
6283f55e BB	201	elif test -r $SPL_OBJ/module/Module.symvers; then
	202	SPL_SYMBOLS=Module.symvers
	203	elif test -r $SPL_OBJ/module/Modules.symvers; then
	204	SPL_SYMBOLS=Modules.symvers
c9c0d073 BB	205	else
	206	SPL_SYMBOLS=$LINUX_SYMBOLS
	207	fi
	208
	209	AC_MSG_RESULT([$SPL_SYMBOLS])
	210	AC_SUBST(SPL_SYMBOLS)
	211	])
	212
	213	dnl #
	214	dnl # Detect the SPL module to be built against
	215	dnl #
	216	AC_DEFUN([ZFS_AC_SPL], [
	217	AC_ARG_WITH([spl],
	218	AS_HELP_STRING([--with-spl=PATH],
	219	[Path to spl source]),
	220	[splsrc="$withval"])
	221
	222	AC_ARG_WITH([spl-obj],
	223	AS_HELP_STRING([--with-spl-obj=PATH],
	224	[Path to spl build objects]),
	225	[splbuild="$withval"])
	226
	227
	228	AC_MSG_CHECKING([spl source directory])
	229	if test -z "$splsrc"; then
	230	sourcelink=`ls -1d /usr/src/spl-*/${LINUX_VERSION} \
	231	2>/dev/null \| tail -1`
	232
	233	if test -z "$sourcelink" \|\| test ! -e $sourcelink; then
	234	sourcelink=../spl
	235	fi
	236
	237	if test -e $sourcelink; then
	238	splsrc=`readlink -f ${sourcelink}`
	239	else
	240	AC_MSG_RESULT([Not found])
	241	AC_MSG_ERROR([
	242	*** Please make sure the spl devel package for your distribution
	243	*** is installed then try again. If that fails you can specify the
	244	*** location of the spl source with the '--with-spl=PATH' option.])
	245	fi
	246	else
	247	if test "$splsrc" = "NONE"; then
	248	splbuild=NONE
	249	splsrcver=NONE
	250	fi
	251	fi
	252
	253	AC_MSG_RESULT([$splsrc])
	254	AC_MSG_CHECKING([spl build directory])
	255	if test -z "$splbuild"; then
6283f55e	256	splbuild=${splsrc}
c9c0d073 BB	257	fi
	258	AC_MSG_RESULT([$splbuild])
	259
	260	AC_MSG_CHECKING([spl source version])
5e612145 BB	261	if test -r $splbuild/spl_config.h &&
5e612145 BB	262	fgrep -q SPL_META_VERSION $splbuild/spl_config.h; then
c9c0d073 BB	263
	264	splsrcver=`(echo "#include <spl_config.h>";
	265	echo "splsrcver=SPL_META_VERSION") \|
5e612145	266	cpp -I $splbuild \|
c9c0d073 BB	267	grep "^splsrcver=" \| cut -d \" -f 2`
	268	fi
	269
	270	if test -z "$splsrcver"; then
	271	AC_MSG_RESULT([Not found])
	272	AC_MSG_ERROR([
	273	*** Cannot determine the version of the spl source.
	274	*** Please prepare the spl source before running this script])
	275	fi
	276
	277	AC_MSG_RESULT([$splsrcver])
	278
	279	SPL=${splsrc}
	280	SPL_OBJ=${splbuild}
	281	SPL_VERSION=${splsrcver}
	282
	283	AC_SUBST(SPL)
	284	AC_SUBST(SPL_OBJ)
	285	AC_SUBST(SPL_VERSION)
	286
	287	ZFS_AC_SPL_MODULE_SYMVERS
	288	])
	289
15805c77 BB	290	dnl #
	291	dnl # Certain kernel build options are not supported. These must be
	292	dnl # detected at configure time and cause a build failure. Otherwise
	293	dnl # modules may be successfully built that behave incorrectly.
	294	dnl #
	295	dnl # CONFIG_PREEMPT - Preempt kernels require special handling.
c9c0d073 BB	296	dnl #
	297	dnl # There are certain kernel build options which when enabled are
	298	dnl # completely incompatible with non GPL kernel modules. It is best
	299	dnl # to detect these at configure time and fail with a clear error
	300	dnl # rather than build everything and fail during linking.
	301	dnl #
	302	dnl # CONFIG_DEBUG_LOCK_ALLOC - Maps mutex_lock() to mutex_lock_nested()
	303	dnl #
	304	AC_DEFUN([ZFS_AC_KERNEL_CONFIG], [
	305
15805c77 BB	306	ZFS_LINUX_CONFIG([PREEMPT],
	307	AC_MSG_ERROR([
	308	*** Kernel built with CONFIG_PREEMPT which is not supported.
	309	** You must rebuild your kernel without this option.]), [])
	310
c9c0d073 BB	311	if test "$ZFS_META_LICENSE" = CDDL; then
	312	ZFS_LINUX_CONFIG([DEBUG_LOCK_ALLOC],
	313	AC_MSG_ERROR([
	314	*** Kernel built with CONFIG_DEBUG_LOCK_ALLOC which is
	315	*** incompatible with the CDDL license. You must rebuild
	316	*** your kernel without this option.]), [])
	317	fi
	318
	319	if test "$ZFS_META_LICENSE" = GPL; then
	320	AC_DEFINE([HAVE_GPL_ONLY_SYMBOLS], [1],
	321	[Define to 1 if licensed under the GPL])
	322	fi
	323	])
	324
	325	dnl #
	326	dnl # ZFS_LINUX_CONFTEST
	327	dnl #
	328	AC_DEFUN([ZFS_LINUX_CONFTEST], [
	329	cat confdefs.h - <<_ACEOF >conftest.c
	330	$1
	331	_ACEOF
	332	])
	333
	334	dnl #
	335	dnl # ZFS_LANG_PROGRAM(C)([PROLOGUE], [BODY])
	336	dnl #
	337	m4_define([ZFS_LANG_PROGRAM], [
	338	$1
	339	int
	340	main (void)
	341	{
	342	dnl Do not indent the following line: there may be CPP directives.
	343	dnl Don't move the `;' right after for the same reason.
	344	$2
	345	;
	346	return 0;
	347	}
	348	])
	349
	350	dnl #
	351	dnl # ZFS_LINUX_COMPILE_IFELSE / like AC_COMPILE_IFELSE
	352	dnl #
	353	AC_DEFUN([ZFS_LINUX_COMPILE_IFELSE], [
	354	m4_ifvaln([$1], [ZFS_LINUX_CONFTEST([$1])])
	355	rm -Rf build && mkdir -p build
	356	echo "obj-m := conftest.o" >build/Makefile
	357	AS_IF(
	358	[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])],
	359	[$4],
	360	[_AC_MSG_LOG_CONFTEST m4_ifvaln([$5],[$5])]
	361	)
	362	rm -Rf build
	363	])
	364
	365	dnl #
	366	dnl # ZFS_LINUX_TRY_COMPILE like AC_TRY_COMPILE
	367	dnl #
	368	AC_DEFUN([ZFS_LINUX_TRY_COMPILE],
	369	[ZFS_LINUX_COMPILE_IFELSE(
	370	[AC_LANG_SOURCE([ZFS_LANG_PROGRAM([[$1]], [[$2]])])],
	371	[modules],
	372	[test -s build/conftest.o],
	373	[$3], [$4])
	374	])
375
376	dnl #
377	dnl # ZFS_LINUX_CONFIG
378	dnl #
379	AC_DEFUN([ZFS_LINUX_CONFIG],
380	[AC_MSG_CHECKING([whether Linux was built with CONFIG_$1])
381	ZFS_LINUX_TRY_COMPILE([
382	#ifndef AUTOCONF_INCLUDED
383	#include <linux/config.h>
384	#endif
385	],[
386	#ifndef CONFIG_$1
387	#error CONFIG_$1 not #defined
388	#endif
389	],[
390	AC_MSG_RESULT([yes])
391	$2
392	],[
393	AC_MSG_RESULT([no])
394	$3
395	])
396	])
397
398	dnl #
399	dnl # ZFS_CHECK_SYMBOL_EXPORT
400	dnl # check symbol exported or not
401	dnl #
402	AC_DEFUN([ZFS_CHECK_SYMBOL_EXPORT],
403	[AC_MSG_CHECKING([whether symbol $1 is exported])
404	grep -q -E '[[[:space:]]]$1[[[:space:]]]' \
405	$LINUX_OBJ/$LINUX_SYMBOLS 2>/dev/null
406	rc=$?
407	if test $rc -ne 0; then
408	export=0
409	for file in $2; do
410	grep -q -E "EXPORT_SYMBOL.*($1)" "$LINUX/$file" 2>/dev/null
411	rc=$?
412	if test $rc -eq 0; then
413	export=1
414	break;
415	fi
416	done
417	if test $export -eq 0; then
418	AC_MSG_RESULT([no])
419	$4
420	else
421	AC_MSG_RESULT([yes])
422	$3
423	fi
424	else
425	AC_MSG_RESULT([yes])
426	$3
427	fi
428	])