[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
	ZFS_AC_KERNEL_D_OBTAIN_ALIAS
	ZFS_AC_KERNEL_CHECK_DISK_SIZE_CHANGE

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