[mirror_zfs-debian.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

	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="$KERNELCPPFLAGS -Wno-unused-but-set-variable"
	KERNELCPPFLAGS="$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])
		$3
	fi
])
Commit	Line	Data
c9c0d073 BB	1	dnl #
	2	dnl # Default ZFS kernel configuration
	3	dnl #
	4	AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
	5	ZFS_AC_KERNEL
	6	ZFS_AC_SPL
	7	ZFS_AC_KERNEL_CONFIG
	8	ZFS_AC_KERNEL_BDEV_BLOCK_DEVICE_OPERATIONS
	9	ZFS_AC_KERNEL_TYPE_FMODE_T
	10	ZFS_AC_KERNEL_KOBJ_NAME_LEN
45066d1f	11	ZFS_AC_KERNEL_BLKDEV_GET_BY_PATH
c9c0d073 BB	12	ZFS_AC_KERNEL_OPEN_BDEV_EXCLUSIVE
	13	ZFS_AC_KERNEL_INVALIDATE_BDEV_ARGS
	14	ZFS_AC_KERNEL_BDEV_LOGICAL_BLOCK_SIZE
	15	ZFS_AC_KERNEL_BIO_EMPTY_BARRIER
2959d94a	16	ZFS_AC_KERNEL_BIO_FAILFAST
f4af6bb7 BB	17	ZFS_AC_KERNEL_BIO_FAILFAST_DTD
f4af6bb7 BB	18	ZFS_AC_KERNEL_REQ_FAILFAST_MASK
c9c0d073	19	ZFS_AC_KERNEL_BIO_END_IO_T_ARGS
675de5aa	20	ZFS_AC_KERNEL_BIO_RW_SYNC
c9c0d073	21	ZFS_AC_KERNEL_BIO_RW_SYNCIO
675de5aa	22	ZFS_AC_KERNEL_REQ_SYNC
c9c0d073 BB	23	ZFS_AC_KERNEL_BLK_END_REQUEST
	24	ZFS_AC_KERNEL_BLK_FETCH_REQUEST
	25	ZFS_AC_KERNEL_BLK_REQUEUE_REQUEST
	26	ZFS_AC_KERNEL_BLK_RQ_BYTES
	27	ZFS_AC_KERNEL_BLK_RQ_POS
	28	ZFS_AC_KERNEL_BLK_RQ_SECTORS
	29	ZFS_AC_KERNEL_GET_DISK_RO
	30	ZFS_AC_KERNEL_RQ_IS_SYNC
	31	ZFS_AC_KERNEL_RQ_FOR_EACH_SEGMENT
777d4af8	32	ZFS_AC_KERNEL_CONST_XATTR_HANDLER
f9637c6c BB	33	ZFS_AC_KERNEL_XATTR_HANDLER_GET
f9637c6c BB	34	ZFS_AC_KERNEL_XATTR_HANDLER_SET
7268e1be	35	ZFS_AC_KERNEL_FSYNC_2ARGS
2c395def	36	ZFS_AC_KERNEL_EVICT_INODE
bdf4328b	37	ZFS_AC_KERNEL_INSERT_INODE_LOCKED
c9c0d073	38
6283f55e BB	39	if test "$LINUX_OBJ" != "$LINUX"; then
	40	KERNELMAKE_PARAMS="$KERNELMAKE_PARAMS O=$LINUX_OBJ"
	41	fi
	42	AC_SUBST(KERNELMAKE_PARAMS)
	43
	44
c9c0d073 BB	45	dnl # -Wall -fno-strict-aliasing -Wstrict-prototypes and other
c9c0d073 BB	46	dnl # compiler options are added by the kernel build system.
12c1acde	47	KERNELCPPFLAGS="$KERNELCPPFLAGS -Wno-unused-but-set-variable"
c9c0d073 BB	48	KERNELCPPFLAGS="$KERNELCPPFLAGS -DHAVE_SPL -D_KERNEL"
c9c0d073 BB	49	KERNELCPPFLAGS="$KERNELCPPFLAGS -DTEXT_DOMAIN=\\\"zfs-linux-kernel\\\""
c9c0d073	50
c9c0d073 BB	51	AC_SUBST(KERNELCPPFLAGS)
	52	])
	53
	54	dnl #
	55	dnl # Detect name used for Module.symvers file in kernel
	56	dnl #
	57	AC_DEFUN([ZFS_AC_MODULE_SYMVERS], [
	58	modpost=$LINUX/scripts/Makefile.modpost
	59	AC_MSG_CHECKING([kernel file name for module symbols])
	60	if test -f "$modpost"; then
	61	if grep -q Modules.symvers $modpost; then
	62	LINUX_SYMBOLS=Modules.symvers
	63	else
	64	LINUX_SYMBOLS=Module.symvers
	65	fi
a60b1c0a BB	66
	67	if ! test -f "$LINUX_OBJ/$LINUX_SYMBOLS"; then
	68	AC_MSG_ERROR([
	69	*** Please make sure the kernel devel package for your distribution
	70	*** is installed. If your building with a custom kernel make sure the
	71	*** kernel is configured, built, and the '--with-linux=PATH' configure
	72	*** option refers to the location of the kernel source.])
	73	fi
c9c0d073 BB	74	else
	75	LINUX_SYMBOLS=NONE
	76	fi
	77	AC_MSG_RESULT($LINUX_SYMBOLS)
	78	AC_SUBST(LINUX_SYMBOLS)
	79	])
	80
	81	dnl #
	82	dnl # Detect the kernel to be built against
	83	dnl #
	84	AC_DEFUN([ZFS_AC_KERNEL], [
	85	AC_ARG_WITH([linux],
	86	AS_HELP_STRING([--with-linux=PATH],
	87	[Path to kernel source]),
	88	[kernelsrc="$withval"])
	89
	90	AC_ARG_WITH(linux-obj,
	91	AS_HELP_STRING([--with-linux-obj=PATH],
	92	[Path to kernel build objects]),
	93	[kernelbuild="$withval"])
	94
	95	AC_MSG_CHECKING([kernel source directory])
	96	if test -z "$kernelsrc"; then
1b94c25c BB	97	if test -e "/lib/modules/$(uname -r)/source"; then
	98	headersdir="/lib/modules/$(uname -r)/source"
	99	sourcelink=$(readlink -f "$headersdir")
	100	elif test -e "/lib/modules/$(uname -r)/build"; then
	101	headersdir="/lib/modules/$(uname -r)/build"
c9c0d073 BB	102	sourcelink=$(readlink -f "$headersdir")
	103	else
	104	sourcelink=$(ls -1d /usr/src/kernels/* \
	105	/usr/src/linux-* \
	106	2>/dev/null \| grep -v obj \| tail -1)
	107	fi
	108
	109	if test -n "$sourcelink" && test -e ${sourcelink}; then
	110	kernelsrc=`readlink -f ${sourcelink}`
	111	else
	112	AC_MSG_RESULT([Not found])
	113	AC_MSG_ERROR([
	114	*** Please make sure the kernel devel package for your distribution
	115	*** is installed then try again. If that fails you can specify the
	116	*** location of the kernel source with the '--with-linux=PATH' option.])
	117	fi
	118	else
	119	if test "$kernelsrc" = "NONE"; then
	120	kernsrcver=NONE
	121	fi
	122	fi
	123
	124	AC_MSG_RESULT([$kernelsrc])
	125	AC_MSG_CHECKING([kernel build directory])
	126	if test -z "$kernelbuild"; then
1b94c25c BB	127	if test -e "/lib/modules/$(uname -r)/build"; then
	128	kernelbuild=`readlink -f /lib/modules/$(uname -r)/build`
	129	elif test -d ${kernelsrc}-obj/${target_cpu}/${target_cpu}; then
c9c0d073 BB	130	kernelbuild=${kernelsrc}-obj/${target_cpu}/${target_cpu}
	131	elif test -d ${kernelsrc}-obj/${target_cpu}/default; then
	132	kernelbuild=${kernelsrc}-obj/${target_cpu}/default
	133	elif test -d `dirname ${kernelsrc}`/build-${target_cpu}; then
	134	kernelbuild=`dirname ${kernelsrc}`/build-${target_cpu}
	135	else
	136	kernelbuild=${kernelsrc}
	137	fi
	138	fi
	139	AC_MSG_RESULT([$kernelbuild])
	140
	141	AC_MSG_CHECKING([kernel source version])
	142	utsrelease1=$kernelbuild/include/linux/version.h
	143	utsrelease2=$kernelbuild/include/linux/utsrelease.h
	144	utsrelease3=$kernelbuild/include/generated/utsrelease.h
	145	if test -r $utsrelease1 && fgrep -q UTS_RELEASE $utsrelease1; then
	146	utsrelease=linux/version.h
	147	elif test -r $utsrelease2 && fgrep -q UTS_RELEASE $utsrelease2; then
	148	utsrelease=linux/utsrelease.h
	149	elif test -r $utsrelease3 && fgrep -q UTS_RELEASE $utsrelease3; then
	150	utsrelease=generated/utsrelease.h
	151	fi
	152
	153	if test "$utsrelease"; then
	154	kernsrcver=`(echo "#include <$utsrelease>";
	155	echo "kernsrcver=UTS_RELEASE") \|
	156	cpp -I $kernelbuild/include \|
	157	grep "^kernsrcver=" \| cut -d \" -f 2`
	158
	159	if test -z "$kernsrcver"; then
	160	AC_MSG_RESULT([Not found])
	161	AC_MSG_ERROR([*** Cannot determine kernel version.])
	162	fi
	163	else
	164	AC_MSG_RESULT([Not found])
	165	AC_MSG_ERROR([*** Cannot find UTS_RELEASE definition.])
	166	fi
	167
	168	AC_MSG_RESULT([$kernsrcver])
	169
	170	LINUX=${kernelsrc}
	171	LINUX_OBJ=${kernelbuild}
	172	LINUX_VERSION=${kernsrcver}
	173
	174	AC_SUBST(LINUX)
	175	AC_SUBST(LINUX_OBJ)
	176	AC_SUBST(LINUX_VERSION)
	177
	178	ZFS_AC_MODULE_SYMVERS
	179	])
	180
	181	dnl #
	182	dnl # Detect name used for the additional SPL Module.symvers file. If one
	183	dnl # does not exist this is likely because the SPL has been configured
	184	dnl # but not built. To allow recursive builds a good guess is made as to
	185	dnl # what this file will be named based on what it is named in the kernel
	186	dnl # build products. This file will first be used at link time so if
	187	dnl # the guess is wrong the build will fail then. This unfortunately
	188	dnl # means the ZFS package does not contain a reliable mechanism to
	189	dnl # detect symbols exported by the SPL at configure time.
	190	dnl #
	191	AC_DEFUN([ZFS_AC_SPL_MODULE_SYMVERS], [
	192	AC_MSG_CHECKING([spl file name for module symbols])
	193	if test -r $SPL_OBJ/Module.symvers; then
194	SPL_SYMBOLS=Module.symvers
195	elif test -r $SPL_OBJ/Modules.symvers; then
196	SPL_SYMBOLS=Modules.symvers
6283f55e BB	197	elif test -r $SPL_OBJ/module/Module.symvers; then
	198	SPL_SYMBOLS=Module.symvers
	199	elif test -r $SPL_OBJ/module/Modules.symvers; then
	200	SPL_SYMBOLS=Modules.symvers
c9c0d073 BB	201	else
	202	SPL_SYMBOLS=$LINUX_SYMBOLS
	203	fi
	204
	205	AC_MSG_RESULT([$SPL_SYMBOLS])
	206	AC_SUBST(SPL_SYMBOLS)
	207	])
	208
	209	dnl #
	210	dnl # Detect the SPL module to be built against
	211	dnl #
	212	AC_DEFUN([ZFS_AC_SPL], [
	213	AC_ARG_WITH([spl],
	214	AS_HELP_STRING([--with-spl=PATH],
	215	[Path to spl source]),
	216	[splsrc="$withval"])
	217
	218	AC_ARG_WITH([spl-obj],
	219	AS_HELP_STRING([--with-spl-obj=PATH],
	220	[Path to spl build objects]),
	221	[splbuild="$withval"])
	222
	223
	224	AC_MSG_CHECKING([spl source directory])
	225	if test -z "$splsrc"; then
	226	sourcelink=`ls -1d /usr/src/spl-*/${LINUX_VERSION} \
	227	2>/dev/null \| tail -1`
	228
	229	if test -z "$sourcelink" \|\| test ! -e $sourcelink; then
	230	sourcelink=../spl
	231	fi
	232
	233	if test -e $sourcelink; then
	234	splsrc=`readlink -f ${sourcelink}`
	235	else
	236	AC_MSG_RESULT([Not found])
	237	AC_MSG_ERROR([
	238	*** Please make sure the spl devel package for your distribution
	239	*** is installed then try again. If that fails you can specify the
	240	*** location of the spl source with the '--with-spl=PATH' option.])
	241	fi
	242	else
	243	if test "$splsrc" = "NONE"; then
	244	splbuild=NONE
	245	splsrcver=NONE
	246	fi
	247	fi
	248
	249	AC_MSG_RESULT([$splsrc])
	250	AC_MSG_CHECKING([spl build directory])
	251	if test -z "$splbuild"; then
6283f55e	252	splbuild=${splsrc}
c9c0d073 BB	253	fi
	254	AC_MSG_RESULT([$splbuild])
	255
	256	AC_MSG_CHECKING([spl source version])
5e612145 BB	257	if test -r $splbuild/spl_config.h &&
5e612145 BB	258	fgrep -q SPL_META_VERSION $splbuild/spl_config.h; then
c9c0d073 BB	259
	260	splsrcver=`(echo "#include <spl_config.h>";
	261	echo "splsrcver=SPL_META_VERSION") \|
5e612145	262	cpp -I $splbuild \|
c9c0d073 BB	263	grep "^splsrcver=" \| cut -d \" -f 2`
	264	fi
	265
	266	if test -z "$splsrcver"; then
	267	AC_MSG_RESULT([Not found])
	268	AC_MSG_ERROR([
	269	*** Cannot determine the version of the spl source.
	270	*** Please prepare the spl source before running this script])
	271	fi
	272
	273	AC_MSG_RESULT([$splsrcver])
	274
	275	SPL=${splsrc}
	276	SPL_OBJ=${splbuild}
	277	SPL_VERSION=${splsrcver}
	278
	279	AC_SUBST(SPL)
	280	AC_SUBST(SPL_OBJ)
	281	AC_SUBST(SPL_VERSION)
	282
	283	ZFS_AC_SPL_MODULE_SYMVERS
	284	])
	285
15805c77 BB	286	dnl #
	287	dnl # Certain kernel build options are not supported. These must be
	288	dnl # detected at configure time and cause a build failure. Otherwise
	289	dnl # modules may be successfully built that behave incorrectly.
	290	dnl #
	291	dnl # CONFIG_PREEMPT - Preempt kernels require special handling.
c9c0d073 BB	292	dnl #
	293	dnl # There are certain kernel build options which when enabled are
	294	dnl # completely incompatible with non GPL kernel modules. It is best
	295	dnl # to detect these at configure time and fail with a clear error
	296	dnl # rather than build everything and fail during linking.
	297	dnl #
	298	dnl # CONFIG_DEBUG_LOCK_ALLOC - Maps mutex_lock() to mutex_lock_nested()
	299	dnl #
	300	AC_DEFUN([ZFS_AC_KERNEL_CONFIG], [
	301
15805c77 BB	302	ZFS_LINUX_CONFIG([PREEMPT],
	303	AC_MSG_ERROR([
	304	*** Kernel built with CONFIG_PREEMPT which is not supported.
	305	** You must rebuild your kernel without this option.]), [])
	306
c9c0d073 BB	307	if test "$ZFS_META_LICENSE" = CDDL; then
	308	ZFS_LINUX_CONFIG([DEBUG_LOCK_ALLOC],
	309	AC_MSG_ERROR([
	310	*** Kernel built with CONFIG_DEBUG_LOCK_ALLOC which is
	311	*** incompatible with the CDDL license. You must rebuild
	312	*** your kernel without this option.]), [])
	313	fi
	314
	315	if test "$ZFS_META_LICENSE" = GPL; then
	316	AC_DEFINE([HAVE_GPL_ONLY_SYMBOLS], [1],
	317	[Define to 1 if licensed under the GPL])
	318	fi
	319	])
	320
	321	dnl #
	322	dnl # ZFS_LINUX_CONFTEST
	323	dnl #
	324	AC_DEFUN([ZFS_LINUX_CONFTEST], [
	325	cat confdefs.h - <<_ACEOF >conftest.c
	326	$1
	327	_ACEOF
	328	])
	329
	330	dnl #
	331	dnl # ZFS_LANG_PROGRAM(C)([PROLOGUE], [BODY])
	332	dnl #
	333	m4_define([ZFS_LANG_PROGRAM], [
	334	$1
	335	int
	336	main (void)
	337	{
	338	dnl Do not indent the following line: there may be CPP directives.
	339	dnl Don't move the `;' right after for the same reason.
	340	$2
	341	;
	342	return 0;
	343	}
	344	])
	345
	346	dnl #
	347	dnl # ZFS_LINUX_COMPILE_IFELSE / like AC_COMPILE_IFELSE
	348	dnl #
	349	AC_DEFUN([ZFS_LINUX_COMPILE_IFELSE], [
	350	m4_ifvaln([$1], [ZFS_LINUX_CONFTEST([$1])])
	351	rm -Rf build && mkdir -p build
	352	echo "obj-m := conftest.o" >build/Makefile
	353	AS_IF(
	354	[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])],
	355	[$4],
	356	[_AC_MSG_LOG_CONFTEST m4_ifvaln([$5],[$5])]
	357	)
	358	rm -Rf build
	359	])
	360
	361	dnl #
	362	dnl # ZFS_LINUX_TRY_COMPILE like AC_TRY_COMPILE
	363	dnl #
	364	AC_DEFUN([ZFS_LINUX_TRY_COMPILE],
	365	[ZFS_LINUX_COMPILE_IFELSE(
	366	[AC_LANG_SOURCE([ZFS_LANG_PROGRAM([[$1]], [[$2]])])],
	367	[modules],
	368	[test -s build/conftest.o],
	369	[$3], [$4])
	370	])
371
372	dnl #
373	dnl # ZFS_LINUX_CONFIG
374	dnl #
375	AC_DEFUN([ZFS_LINUX_CONFIG],
376	[AC_MSG_CHECKING([whether Linux was built with CONFIG_$1])
377	ZFS_LINUX_TRY_COMPILE([
378	#ifndef AUTOCONF_INCLUDED
379	#include <linux/config.h>
380	#endif
381	],[
382	#ifndef CONFIG_$1
383	#error CONFIG_$1 not #defined
384	#endif
385	],[
386	AC_MSG_RESULT([yes])
387	$2
388	],[
389	AC_MSG_RESULT([no])
390	$3
391	])
392	])
393
394	dnl #
395	dnl # ZFS_CHECK_SYMBOL_EXPORT
396	dnl # check symbol exported or not
397	dnl #
398	AC_DEFUN([ZFS_CHECK_SYMBOL_EXPORT],
399	[AC_MSG_CHECKING([whether symbol $1 is exported])
400	grep -q -E '[[[:space:]]]$1[[[:space:]]]' \
401	$LINUX_OBJ/$LINUX_SYMBOLS 2>/dev/null
402	rc=$?
403	if test $rc -ne 0; then
404	export=0
405	for file in $2; do
406	grep -q -E "EXPORT_SYMBOL.*($1)" "$LINUX/$file" 2>/dev/null
407	rc=$?
408	if test $rc -eq 0; then
409	export=1
410	break;
411	fi
412	done
413	if test $export -eq 0; then
414	AC_MSG_RESULT([no])
415	$4
416	else
417	AC_MSG_RESULT([yes])
418	$3
419	fi
420	else
421	AC_MSG_RESULT([yes])
422	$3
423	fi
424	])