[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
	ZFS_AC_KERNEL_MOUNT_NODEV
	ZFS_AC_KERNEL_BDI

	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([
		#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 # 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])
		$3
	fi
])
Commit	Line	Data
c9c0d073 BB	1	dnl #
	2	dnl # Default ZFS kernel configuration
	3	dnl #
	4	AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
	5	ZFS_AC_KERNEL
	6	ZFS_AC_SPL
	7	ZFS_AC_KERNEL_CONFIG
	8	ZFS_AC_KERNEL_BDEV_BLOCK_DEVICE_OPERATIONS
	9	ZFS_AC_KERNEL_TYPE_FMODE_T
	10	ZFS_AC_KERNEL_KOBJ_NAME_LEN
45066d1f	11	ZFS_AC_KERNEL_BLKDEV_GET_BY_PATH
c9c0d073 BB	12	ZFS_AC_KERNEL_OPEN_BDEV_EXCLUSIVE
	13	ZFS_AC_KERNEL_INVALIDATE_BDEV_ARGS
	14	ZFS_AC_KERNEL_BDEV_LOGICAL_BLOCK_SIZE
	15	ZFS_AC_KERNEL_BIO_EMPTY_BARRIER
2959d94a	16	ZFS_AC_KERNEL_BIO_FAILFAST
f4af6bb7 BB	17	ZFS_AC_KERNEL_BIO_FAILFAST_DTD
f4af6bb7 BB	18	ZFS_AC_KERNEL_REQ_FAILFAST_MASK
c9c0d073	19	ZFS_AC_KERNEL_BIO_END_IO_T_ARGS
675de5aa	20	ZFS_AC_KERNEL_BIO_RW_SYNC
c9c0d073	21	ZFS_AC_KERNEL_BIO_RW_SYNCIO
675de5aa	22	ZFS_AC_KERNEL_REQ_SYNC
c9c0d073 BB	23	ZFS_AC_KERNEL_BLK_END_REQUEST
	24	ZFS_AC_KERNEL_BLK_FETCH_REQUEST
	25	ZFS_AC_KERNEL_BLK_REQUEUE_REQUEST
	26	ZFS_AC_KERNEL_BLK_RQ_BYTES
	27	ZFS_AC_KERNEL_BLK_RQ_POS
	28	ZFS_AC_KERNEL_BLK_RQ_SECTORS
	29	ZFS_AC_KERNEL_GET_DISK_RO
	30	ZFS_AC_KERNEL_RQ_IS_SYNC
	31	ZFS_AC_KERNEL_RQ_FOR_EACH_SEGMENT
777d4af8	32	ZFS_AC_KERNEL_CONST_XATTR_HANDLER
f9637c6c BB	33	ZFS_AC_KERNEL_XATTR_HANDLER_GET
f9637c6c BB	34	ZFS_AC_KERNEL_XATTR_HANDLER_SET
7268e1be	35	ZFS_AC_KERNEL_FSYNC_2ARGS
2c395def	36	ZFS_AC_KERNEL_EVICT_INODE
bdf4328b	37	ZFS_AC_KERNEL_INSERT_INODE_LOCKED
055656d4	38	ZFS_AC_KERNEL_D_OBTAIN_ALIAS
df554c14	39	ZFS_AC_KERNEL_CHECK_DISK_SIZE_CHANGE
b3129792	40	ZFS_AC_KERNEL_TRUNCATE_SETSIZE
5c03efc3	41	ZFS_AC_KERNEL_6ARGS_SECURITY_INODE_INIT_SECURITY
2cf7f52b	42	ZFS_AC_KERNEL_MOUNT_NODEV
76659dc1	43	ZFS_AC_KERNEL_BDI
c9c0d073	44
6283f55e BB	45	if test "$LINUX_OBJ" != "$LINUX"; then
	46	KERNELMAKE_PARAMS="$KERNELMAKE_PARAMS O=$LINUX_OBJ"
	47	fi
	48	AC_SUBST(KERNELMAKE_PARAMS)
	49
	50
c9c0d073 BB	51	dnl # -Wall -fno-strict-aliasing -Wstrict-prototypes and other
c9c0d073 BB	52	dnl # compiler options are added by the kernel build system.
8a7e1cee	53	KERNELCPPFLAGS="$KERNELCPPFLAGS $NO_UNUSED_BUT_SET_VARIABLE"
c9c0d073 BB	54	KERNELCPPFLAGS="$KERNELCPPFLAGS -DHAVE_SPL -D_KERNEL"
c9c0d073 BB	55	KERNELCPPFLAGS="$KERNELCPPFLAGS -DTEXT_DOMAIN=\\\"zfs-linux-kernel\\\""
c9c0d073	56
c9c0d073 BB	57	AC_SUBST(KERNELCPPFLAGS)
	58	])
	59
	60	dnl #
	61	dnl # Detect name used for Module.symvers file in kernel
	62	dnl #
	63	AC_DEFUN([ZFS_AC_MODULE_SYMVERS], [
	64	modpost=$LINUX/scripts/Makefile.modpost
	65	AC_MSG_CHECKING([kernel file name for module symbols])
	66	if test -f "$modpost"; then
	67	if grep -q Modules.symvers $modpost; then
	68	LINUX_SYMBOLS=Modules.symvers
	69	else
	70	LINUX_SYMBOLS=Module.symvers
	71	fi
a60b1c0a BB	72
	73	if ! test -f "$LINUX_OBJ/$LINUX_SYMBOLS"; then
	74	AC_MSG_ERROR([
	75	*** Please make sure the kernel devel package for your distribution
	76	*** is installed. If your building with a custom kernel make sure the
	77	*** kernel is configured, built, and the '--with-linux=PATH' configure
	78	*** option refers to the location of the kernel source.])
	79	fi
c9c0d073 BB	80	else
	81	LINUX_SYMBOLS=NONE
	82	fi
	83	AC_MSG_RESULT($LINUX_SYMBOLS)
	84	AC_SUBST(LINUX_SYMBOLS)
	85	])
	86
	87	dnl #
	88	dnl # Detect the kernel to be built against
	89	dnl #
	90	AC_DEFUN([ZFS_AC_KERNEL], [
	91	AC_ARG_WITH([linux],
	92	AS_HELP_STRING([--with-linux=PATH],
	93	[Path to kernel source]),
	94	[kernelsrc="$withval"])
	95
	96	AC_ARG_WITH(linux-obj,
	97	AS_HELP_STRING([--with-linux-obj=PATH],
	98	[Path to kernel build objects]),
	99	[kernelbuild="$withval"])
	100
	101	AC_MSG_CHECKING([kernel source directory])
	102	if test -z "$kernelsrc"; then
1b94c25c BB	103	if test -e "/lib/modules/$(uname -r)/source"; then
	104	headersdir="/lib/modules/$(uname -r)/source"
	105	sourcelink=$(readlink -f "$headersdir")
	106	elif test -e "/lib/modules/$(uname -r)/build"; then
	107	headersdir="/lib/modules/$(uname -r)/build"
c9c0d073 BB	108	sourcelink=$(readlink -f "$headersdir")
	109	else
	110	sourcelink=$(ls -1d /usr/src/kernels/* \
	111	/usr/src/linux-* \
	112	2>/dev/null \| grep -v obj \| tail -1)
	113	fi
	114
	115	if test -n "$sourcelink" && test -e ${sourcelink}; then
	116	kernelsrc=`readlink -f ${sourcelink}`
	117	else
	118	AC_MSG_RESULT([Not found])
	119	AC_MSG_ERROR([
	120	*** Please make sure the kernel devel package for your distribution
	121	*** is installed then try again. If that fails you can specify the
	122	*** location of the kernel source with the '--with-linux=PATH' option.])
	123	fi
	124	else
	125	if test "$kernelsrc" = "NONE"; then
	126	kernsrcver=NONE
	127	fi
	128	fi
	129
	130	AC_MSG_RESULT([$kernelsrc])
	131	AC_MSG_CHECKING([kernel build directory])
	132	if test -z "$kernelbuild"; then
1b94c25c BB	133	if test -e "/lib/modules/$(uname -r)/build"; then
	134	kernelbuild=`readlink -f /lib/modules/$(uname -r)/build`
	135	elif test -d ${kernelsrc}-obj/${target_cpu}/${target_cpu}; then
c9c0d073 BB	136	kernelbuild=${kernelsrc}-obj/${target_cpu}/${target_cpu}
	137	elif test -d ${kernelsrc}-obj/${target_cpu}/default; then
	138	kernelbuild=${kernelsrc}-obj/${target_cpu}/default
	139	elif test -d `dirname ${kernelsrc}`/build-${target_cpu}; then
	140	kernelbuild=`dirname ${kernelsrc}`/build-${target_cpu}
	141	else
	142	kernelbuild=${kernelsrc}
	143	fi
	144	fi
	145	AC_MSG_RESULT([$kernelbuild])
	146
	147	AC_MSG_CHECKING([kernel source version])
	148	utsrelease1=$kernelbuild/include/linux/version.h
	149	utsrelease2=$kernelbuild/include/linux/utsrelease.h
	150	utsrelease3=$kernelbuild/include/generated/utsrelease.h
	151	if test -r $utsrelease1 && fgrep -q UTS_RELEASE $utsrelease1; then
	152	utsrelease=linux/version.h
	153	elif test -r $utsrelease2 && fgrep -q UTS_RELEASE $utsrelease2; then
	154	utsrelease=linux/utsrelease.h
	155	elif test -r $utsrelease3 && fgrep -q UTS_RELEASE $utsrelease3; then
	156	utsrelease=generated/utsrelease.h
	157	fi
	158
	159	if test "$utsrelease"; then
	160	kernsrcver=`(echo "#include <$utsrelease>";
	161	echo "kernsrcver=UTS_RELEASE") \|
	162	cpp -I $kernelbuild/include \|
	163	grep "^kernsrcver=" \| cut -d \" -f 2`
	164
	165	if test -z "$kernsrcver"; then
	166	AC_MSG_RESULT([Not found])
	167	AC_MSG_ERROR([*** Cannot determine kernel version.])
	168	fi
	169	else
	170	AC_MSG_RESULT([Not found])
	171	AC_MSG_ERROR([*** Cannot find UTS_RELEASE definition.])
	172	fi
	173
	174	AC_MSG_RESULT([$kernsrcver])
	175
	176	LINUX=${kernelsrc}
	177	LINUX_OBJ=${kernelbuild}
	178	LINUX_VERSION=${kernsrcver}
	179
	180	AC_SUBST(LINUX)
	181	AC_SUBST(LINUX_OBJ)
	182	AC_SUBST(LINUX_VERSION)
	183
	184	ZFS_AC_MODULE_SYMVERS
	185	])
	186
	187	dnl #
	188	dnl # Detect name used for the additional SPL Module.symvers file. If one
	189	dnl # does not exist this is likely because the SPL has been configured
	190	dnl # but not built. To allow recursive builds a good guess is made as to
	191	dnl # what this file will be named based on what it is named in the kernel
	192	dnl # build products. This file will first be used at link time so if
	193	dnl # the guess is wrong the build will fail then. This unfortunately
	194	dnl # means the ZFS package does not contain a reliable mechanism to
	195	dnl # detect symbols exported by the SPL at configure time.
	196	dnl #
	197	AC_DEFUN([ZFS_AC_SPL_MODULE_SYMVERS], [
	198	AC_MSG_CHECKING([spl file name for module symbols])
	199	if test -r $SPL_OBJ/Module.symvers; then
200	SPL_SYMBOLS=Module.symvers
201	elif test -r $SPL_OBJ/Modules.symvers; then
202	SPL_SYMBOLS=Modules.symvers
6283f55e BB	203	elif test -r $SPL_OBJ/module/Module.symvers; then
	204	SPL_SYMBOLS=Module.symvers
	205	elif test -r $SPL_OBJ/module/Modules.symvers; then
	206	SPL_SYMBOLS=Modules.symvers
c9c0d073 BB	207	else
	208	SPL_SYMBOLS=$LINUX_SYMBOLS
	209	fi
	210
	211	AC_MSG_RESULT([$SPL_SYMBOLS])
	212	AC_SUBST(SPL_SYMBOLS)
	213	])
	214
	215	dnl #
	216	dnl # Detect the SPL module to be built against
	217	dnl #
	218	AC_DEFUN([ZFS_AC_SPL], [
	219	AC_ARG_WITH([spl],
	220	AS_HELP_STRING([--with-spl=PATH],
	221	[Path to spl source]),
	222	[splsrc="$withval"])
	223
	224	AC_ARG_WITH([spl-obj],
	225	AS_HELP_STRING([--with-spl-obj=PATH],
	226	[Path to spl build objects]),
	227	[splbuild="$withval"])
	228
	229
	230	AC_MSG_CHECKING([spl source directory])
	231	if test -z "$splsrc"; then
	232	sourcelink=`ls -1d /usr/src/spl-*/${LINUX_VERSION} \
	233	2>/dev/null \| tail -1`
	234
	235	if test -z "$sourcelink" \|\| test ! -e $sourcelink; then
	236	sourcelink=../spl
	237	fi
	238
	239	if test -e $sourcelink; then
	240	splsrc=`readlink -f ${sourcelink}`
	241	else
	242	AC_MSG_RESULT([Not found])
	243	AC_MSG_ERROR([
	244	*** Please make sure the spl devel package for your distribution
	245	*** is installed then try again. If that fails you can specify the
	246	*** location of the spl source with the '--with-spl=PATH' option.])
	247	fi
	248	else
	249	if test "$splsrc" = "NONE"; then
	250	splbuild=NONE
	251	splsrcver=NONE
	252	fi
	253	fi
	254
	255	AC_MSG_RESULT([$splsrc])
	256	AC_MSG_CHECKING([spl build directory])
	257	if test -z "$splbuild"; then
6283f55e	258	splbuild=${splsrc}
c9c0d073 BB	259	fi
	260	AC_MSG_RESULT([$splbuild])
	261
	262	AC_MSG_CHECKING([spl source version])
5e612145 BB	263	if test -r $splbuild/spl_config.h &&
5e612145 BB	264	fgrep -q SPL_META_VERSION $splbuild/spl_config.h; then
c9c0d073 BB	265
	266	splsrcver=`(echo "#include <spl_config.h>";
	267	echo "splsrcver=SPL_META_VERSION") \|
5e612145	268	cpp -I $splbuild \|
c9c0d073 BB	269	grep "^splsrcver=" \| cut -d \" -f 2`
	270	fi
	271
	272	if test -z "$splsrcver"; then
	273	AC_MSG_RESULT([Not found])
	274	AC_MSG_ERROR([
	275	*** Cannot determine the version of the spl source.
	276	*** Please prepare the spl source before running this script])
	277	fi
	278
	279	AC_MSG_RESULT([$splsrcver])
	280
	281	SPL=${splsrc}
	282	SPL_OBJ=${splbuild}
	283	SPL_VERSION=${splsrcver}
	284
	285	AC_SUBST(SPL)
	286	AC_SUBST(SPL_OBJ)
	287	AC_SUBST(SPL_VERSION)
	288
	289	ZFS_AC_SPL_MODULE_SYMVERS
	290	])
	291
15805c77 BB	292	dnl #
	293	dnl # Certain kernel build options are not supported. These must be
	294	dnl # detected at configure time and cause a build failure. Otherwise
	295	dnl # modules may be successfully built that behave incorrectly.
	296	dnl #
	297	dnl # CONFIG_PREEMPT - Preempt kernels require special handling.
c9c0d073 BB	298	dnl #
	299	dnl # There are certain kernel build options which when enabled are
	300	dnl # completely incompatible with non GPL kernel modules. It is best
	301	dnl # to detect these at configure time and fail with a clear error
	302	dnl # rather than build everything and fail during linking.
	303	dnl #
	304	dnl # CONFIG_DEBUG_LOCK_ALLOC - Maps mutex_lock() to mutex_lock_nested()
	305	dnl #
	306	AC_DEFUN([ZFS_AC_KERNEL_CONFIG], [
	307
15805c77 BB	308	ZFS_LINUX_CONFIG([PREEMPT],
	309	AC_MSG_ERROR([
	310	*** Kernel built with CONFIG_PREEMPT which is not supported.
	311	** You must rebuild your kernel without this option.]), [])
	312
c9c0d073 BB	313	if test "$ZFS_META_LICENSE" = CDDL; then
	314	ZFS_LINUX_CONFIG([DEBUG_LOCK_ALLOC],
	315	AC_MSG_ERROR([
	316	*** Kernel built with CONFIG_DEBUG_LOCK_ALLOC which is
	317	*** incompatible with the CDDL license. You must rebuild
	318	*** your kernel without this option.]), [])
	319	fi
	320
	321	if test "$ZFS_META_LICENSE" = GPL; then
	322	AC_DEFINE([HAVE_GPL_ONLY_SYMBOLS], [1],
	323	[Define to 1 if licensed under the GPL])
	324	fi
	325	])
	326
	327	dnl #
	328	dnl # ZFS_LINUX_CONFTEST
	329	dnl #
	330	AC_DEFUN([ZFS_LINUX_CONFTEST], [
	331	cat confdefs.h - <<_ACEOF >conftest.c
	332	$1
	333	_ACEOF
	334	])
	335
	336	dnl #
	337	dnl # ZFS_LANG_PROGRAM(C)([PROLOGUE], [BODY])
	338	dnl #
	339	m4_define([ZFS_LANG_PROGRAM], [
	340	$1
	341	int
	342	main (void)
	343	{
	344	dnl Do not indent the following line: there may be CPP directives.
	345	dnl Don't move the `;' right after for the same reason.
	346	$2
	347	;
	348	return 0;
	349	}
	350	])
	351
	352	dnl #
	353	dnl # ZFS_LINUX_COMPILE_IFELSE / like AC_COMPILE_IFELSE
	354	dnl #
	355	AC_DEFUN([ZFS_LINUX_COMPILE_IFELSE], [
	356	m4_ifvaln([$1], [ZFS_LINUX_CONFTEST([$1])])
	357	rm -Rf build && mkdir -p build
	358	echo "obj-m := conftest.o" >build/Makefile
	359	AS_IF(
	360	[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])],
	361	[$4],
	362	[_AC_MSG_LOG_CONFTEST m4_ifvaln([$5],[$5])]
	363	)
	364	rm -Rf build
	365	])
	366
	367	dnl #
	368	dnl # ZFS_LINUX_TRY_COMPILE like AC_TRY_COMPILE
	369	dnl #
	370	AC_DEFUN([ZFS_LINUX_TRY_COMPILE],
	371	[ZFS_LINUX_COMPILE_IFELSE(
	372	[AC_LANG_SOURCE([ZFS_LANG_PROGRAM([[$1]], [[$2]])])],
	373	[modules],
	374	[test -s build/conftest.o],
	375	[$3], [$4])
	376	])
377
378	dnl #
379	dnl # ZFS_LINUX_CONFIG
380	dnl #
381	AC_DEFUN([ZFS_LINUX_CONFIG],
382	[AC_MSG_CHECKING([whether Linux was built with CONFIG_$1])
383	ZFS_LINUX_TRY_COMPILE([
0da78696	384	#include <linux/module.h>
c9c0d073 BB	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	])