[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

	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])
		$3
	fi
])
Commit	Line	Data
c9c0d073 BB	1	dnl #
	2	dnl # Default ZFS kernel configuration
	3	dnl #
	4	AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
	5	ZFS_AC_KERNEL
	6	ZFS_AC_SPL
	7	ZFS_AC_KERNEL_CONFIG
	8	ZFS_AC_KERNEL_BDEV_BLOCK_DEVICE_OPERATIONS
	9	ZFS_AC_KERNEL_TYPE_FMODE_T
	10	ZFS_AC_KERNEL_KOBJ_NAME_LEN
45066d1f	11	ZFS_AC_KERNEL_BLKDEV_GET_BY_PATH
c9c0d073 BB	12	ZFS_AC_KERNEL_OPEN_BDEV_EXCLUSIVE
	13	ZFS_AC_KERNEL_INVALIDATE_BDEV_ARGS
	14	ZFS_AC_KERNEL_BDEV_LOGICAL_BLOCK_SIZE
	15	ZFS_AC_KERNEL_BIO_EMPTY_BARRIER
2959d94a	16	ZFS_AC_KERNEL_BIO_FAILFAST
f4af6bb7 BB	17	ZFS_AC_KERNEL_BIO_FAILFAST_DTD
f4af6bb7 BB	18	ZFS_AC_KERNEL_REQ_FAILFAST_MASK
c9c0d073	19	ZFS_AC_KERNEL_BIO_END_IO_T_ARGS
675de5aa	20	ZFS_AC_KERNEL_BIO_RW_SYNC
c9c0d073	21	ZFS_AC_KERNEL_BIO_RW_SYNCIO
675de5aa	22	ZFS_AC_KERNEL_REQ_SYNC
c9c0d073 BB	23	ZFS_AC_KERNEL_BLK_END_REQUEST
	24	ZFS_AC_KERNEL_BLK_FETCH_REQUEST
	25	ZFS_AC_KERNEL_BLK_REQUEUE_REQUEST
	26	ZFS_AC_KERNEL_BLK_RQ_BYTES
	27	ZFS_AC_KERNEL_BLK_RQ_POS
	28	ZFS_AC_KERNEL_BLK_RQ_SECTORS
	29	ZFS_AC_KERNEL_GET_DISK_RO
	30	ZFS_AC_KERNEL_RQ_IS_SYNC
	31	ZFS_AC_KERNEL_RQ_FOR_EACH_SEGMENT
777d4af8	32	ZFS_AC_KERNEL_CONST_XATTR_HANDLER
f9637c6c BB	33	ZFS_AC_KERNEL_XATTR_HANDLER_GET
f9637c6c BB	34	ZFS_AC_KERNEL_XATTR_HANDLER_SET
7268e1be	35	ZFS_AC_KERNEL_FSYNC_2ARGS
2c395def	36	ZFS_AC_KERNEL_EVICT_INODE
bdf4328b	37	ZFS_AC_KERNEL_INSERT_INODE_LOCKED
055656d4	38	ZFS_AC_KERNEL_D_OBTAIN_ALIAS
c9c0d073	39
6283f55e BB	40	if test "$LINUX_OBJ" != "$LINUX"; then
	41	KERNELMAKE_PARAMS="$KERNELMAKE_PARAMS O=$LINUX_OBJ"
	42	fi
	43	AC_SUBST(KERNELMAKE_PARAMS)
	44
	45
c9c0d073 BB	46	dnl # -Wall -fno-strict-aliasing -Wstrict-prototypes and other
c9c0d073 BB	47	dnl # compiler options are added by the kernel build system.
12c1acde	48	KERNELCPPFLAGS="$KERNELCPPFLAGS -Wno-unused-but-set-variable"
c9c0d073 BB	49	KERNELCPPFLAGS="$KERNELCPPFLAGS -DHAVE_SPL -D_KERNEL"
c9c0d073 BB	50	KERNELCPPFLAGS="$KERNELCPPFLAGS -DTEXT_DOMAIN=\\\"zfs-linux-kernel\\\""
c9c0d073	51
c9c0d073 BB	52	AC_SUBST(KERNELCPPFLAGS)
	53	])
	54
	55	dnl #
	56	dnl # Detect name used for Module.symvers file in kernel
	57	dnl #
	58	AC_DEFUN([ZFS_AC_MODULE_SYMVERS], [
	59	modpost=$LINUX/scripts/Makefile.modpost
	60	AC_MSG_CHECKING([kernel file name for module symbols])
	61	if test -f "$modpost"; then
	62	if grep -q Modules.symvers $modpost; then
	63	LINUX_SYMBOLS=Modules.symvers
	64	else
	65	LINUX_SYMBOLS=Module.symvers
	66	fi
a60b1c0a BB	67
	68	if ! test -f "$LINUX_OBJ/$LINUX_SYMBOLS"; then
	69	AC_MSG_ERROR([
	70	*** Please make sure the kernel devel package for your distribution
	71	*** is installed. If your building with a custom kernel make sure the
	72	*** kernel is configured, built, and the '--with-linux=PATH' configure
	73	*** option refers to the location of the kernel source.])
	74	fi
c9c0d073 BB	75	else
	76	LINUX_SYMBOLS=NONE
	77	fi
	78	AC_MSG_RESULT($LINUX_SYMBOLS)
	79	AC_SUBST(LINUX_SYMBOLS)
	80	])
	81
	82	dnl #
	83	dnl # Detect the kernel to be built against
	84	dnl #
	85	AC_DEFUN([ZFS_AC_KERNEL], [
	86	AC_ARG_WITH([linux],
	87	AS_HELP_STRING([--with-linux=PATH],
	88	[Path to kernel source]),
	89	[kernelsrc="$withval"])
	90
	91	AC_ARG_WITH(linux-obj,
	92	AS_HELP_STRING([--with-linux-obj=PATH],
	93	[Path to kernel build objects]),
	94	[kernelbuild="$withval"])
	95
	96	AC_MSG_CHECKING([kernel source directory])
	97	if test -z "$kernelsrc"; then
1b94c25c BB	98	if test -e "/lib/modules/$(uname -r)/source"; then
	99	headersdir="/lib/modules/$(uname -r)/source"
	100	sourcelink=$(readlink -f "$headersdir")
	101	elif test -e "/lib/modules/$(uname -r)/build"; then
	102	headersdir="/lib/modules/$(uname -r)/build"
c9c0d073 BB	103	sourcelink=$(readlink -f "$headersdir")
	104	else
	105	sourcelink=$(ls -1d /usr/src/kernels/* \
	106	/usr/src/linux-* \
	107	2>/dev/null \| grep -v obj \| tail -1)
	108	fi
	109
	110	if test -n "$sourcelink" && test -e ${sourcelink}; then
	111	kernelsrc=`readlink -f ${sourcelink}`
	112	else
	113	AC_MSG_RESULT([Not found])
	114	AC_MSG_ERROR([
	115	*** Please make sure the kernel devel package for your distribution
	116	*** is installed then try again. If that fails you can specify the
	117	*** location of the kernel source with the '--with-linux=PATH' option.])
	118	fi
	119	else
	120	if test "$kernelsrc" = "NONE"; then
	121	kernsrcver=NONE
	122	fi
	123	fi
	124
	125	AC_MSG_RESULT([$kernelsrc])
	126	AC_MSG_CHECKING([kernel build directory])
	127	if test -z "$kernelbuild"; then
1b94c25c BB	128	if test -e "/lib/modules/$(uname -r)/build"; then
	129	kernelbuild=`readlink -f /lib/modules/$(uname -r)/build`
	130	elif test -d ${kernelsrc}-obj/${target_cpu}/${target_cpu}; then
c9c0d073 BB	131	kernelbuild=${kernelsrc}-obj/${target_cpu}/${target_cpu}
	132	elif test -d ${kernelsrc}-obj/${target_cpu}/default; then
	133	kernelbuild=${kernelsrc}-obj/${target_cpu}/default
	134	elif test -d `dirname ${kernelsrc}`/build-${target_cpu}; then
	135	kernelbuild=`dirname ${kernelsrc}`/build-${target_cpu}
	136	else
	137	kernelbuild=${kernelsrc}
	138	fi
	139	fi
	140	AC_MSG_RESULT([$kernelbuild])
	141
	142	AC_MSG_CHECKING([kernel source version])
	143	utsrelease1=$kernelbuild/include/linux/version.h
	144	utsrelease2=$kernelbuild/include/linux/utsrelease.h
	145	utsrelease3=$kernelbuild/include/generated/utsrelease.h
	146	if test -r $utsrelease1 && fgrep -q UTS_RELEASE $utsrelease1; then
	147	utsrelease=linux/version.h
	148	elif test -r $utsrelease2 && fgrep -q UTS_RELEASE $utsrelease2; then
	149	utsrelease=linux/utsrelease.h
	150	elif test -r $utsrelease3 && fgrep -q UTS_RELEASE $utsrelease3; then
	151	utsrelease=generated/utsrelease.h
	152	fi
	153
	154	if test "$utsrelease"; then
	155	kernsrcver=`(echo "#include <$utsrelease>";
	156	echo "kernsrcver=UTS_RELEASE") \|
	157	cpp -I $kernelbuild/include \|
	158	grep "^kernsrcver=" \| cut -d \" -f 2`
	159
	160	if test -z "$kernsrcver"; then
	161	AC_MSG_RESULT([Not found])
	162	AC_MSG_ERROR([*** Cannot determine kernel version.])
	163	fi
	164	else
	165	AC_MSG_RESULT([Not found])
	166	AC_MSG_ERROR([*** Cannot find UTS_RELEASE definition.])
	167	fi
	168
	169	AC_MSG_RESULT([$kernsrcver])
	170
	171	LINUX=${kernelsrc}
	172	LINUX_OBJ=${kernelbuild}
	173	LINUX_VERSION=${kernsrcver}
	174
	175	AC_SUBST(LINUX)
	176	AC_SUBST(LINUX_OBJ)
	177	AC_SUBST(LINUX_VERSION)
	178
	179	ZFS_AC_MODULE_SYMVERS
	180	])
	181
	182	dnl #
	183	dnl # Detect name used for the additional SPL Module.symvers file. If one
	184	dnl # does not exist this is likely because the SPL has been configured
	185	dnl # but not built. To allow recursive builds a good guess is made as to
	186	dnl # what this file will be named based on what it is named in the kernel
	187	dnl # build products. This file will first be used at link time so if
	188	dnl # the guess is wrong the build will fail then. This unfortunately
	189	dnl # means the ZFS package does not contain a reliable mechanism to
	190	dnl # detect symbols exported by the SPL at configure time.
	191	dnl #
	192	AC_DEFUN([ZFS_AC_SPL_MODULE_SYMVERS], [
	193	AC_MSG_CHECKING([spl file name for module symbols])
	194	if test -r $SPL_OBJ/Module.symvers; then
195	SPL_SYMBOLS=Module.symvers
196	elif test -r $SPL_OBJ/Modules.symvers; then
197	SPL_SYMBOLS=Modules.symvers
6283f55e BB	198	elif test -r $SPL_OBJ/module/Module.symvers; then
	199	SPL_SYMBOLS=Module.symvers
	200	elif test -r $SPL_OBJ/module/Modules.symvers; then
	201	SPL_SYMBOLS=Modules.symvers
c9c0d073 BB	202	else
	203	SPL_SYMBOLS=$LINUX_SYMBOLS
	204	fi
	205
	206	AC_MSG_RESULT([$SPL_SYMBOLS])
	207	AC_SUBST(SPL_SYMBOLS)
	208	])
	209
	210	dnl #
	211	dnl # Detect the SPL module to be built against
	212	dnl #
	213	AC_DEFUN([ZFS_AC_SPL], [
	214	AC_ARG_WITH([spl],
	215	AS_HELP_STRING([--with-spl=PATH],
	216	[Path to spl source]),
	217	[splsrc="$withval"])
	218
	219	AC_ARG_WITH([spl-obj],
	220	AS_HELP_STRING([--with-spl-obj=PATH],
	221	[Path to spl build objects]),
	222	[splbuild="$withval"])
	223
	224
	225	AC_MSG_CHECKING([spl source directory])
	226	if test -z "$splsrc"; then
	227	sourcelink=`ls -1d /usr/src/spl-*/${LINUX_VERSION} \
	228	2>/dev/null \| tail -1`
	229
	230	if test -z "$sourcelink" \|\| test ! -e $sourcelink; then
	231	sourcelink=../spl
	232	fi
	233
	234	if test -e $sourcelink; then
	235	splsrc=`readlink -f ${sourcelink}`
	236	else
	237	AC_MSG_RESULT([Not found])
	238	AC_MSG_ERROR([
	239	*** Please make sure the spl devel package for your distribution
	240	*** is installed then try again. If that fails you can specify the
	241	*** location of the spl source with the '--with-spl=PATH' option.])
	242	fi
	243	else
	244	if test "$splsrc" = "NONE"; then
	245	splbuild=NONE
	246	splsrcver=NONE
	247	fi
	248	fi
	249
	250	AC_MSG_RESULT([$splsrc])
	251	AC_MSG_CHECKING([spl build directory])
	252	if test -z "$splbuild"; then
6283f55e	253	splbuild=${splsrc}
c9c0d073 BB	254	fi
	255	AC_MSG_RESULT([$splbuild])
	256
	257	AC_MSG_CHECKING([spl source version])
5e612145 BB	258	if test -r $splbuild/spl_config.h &&
5e612145 BB	259	fgrep -q SPL_META_VERSION $splbuild/spl_config.h; then
c9c0d073 BB	260
	261	splsrcver=`(echo "#include <spl_config.h>";
	262	echo "splsrcver=SPL_META_VERSION") \|
5e612145	263	cpp -I $splbuild \|
c9c0d073 BB	264	grep "^splsrcver=" \| cut -d \" -f 2`
	265	fi
	266
	267	if test -z "$splsrcver"; then
	268	AC_MSG_RESULT([Not found])
	269	AC_MSG_ERROR([
	270	*** Cannot determine the version of the spl source.
	271	*** Please prepare the spl source before running this script])
	272	fi
	273
	274	AC_MSG_RESULT([$splsrcver])
	275
	276	SPL=${splsrc}
	277	SPL_OBJ=${splbuild}
	278	SPL_VERSION=${splsrcver}
	279
	280	AC_SUBST(SPL)
	281	AC_SUBST(SPL_OBJ)
	282	AC_SUBST(SPL_VERSION)
	283
	284	ZFS_AC_SPL_MODULE_SYMVERS
	285	])
	286
15805c77 BB	287	dnl #
	288	dnl # Certain kernel build options are not supported. These must be
	289	dnl # detected at configure time and cause a build failure. Otherwise
	290	dnl # modules may be successfully built that behave incorrectly.
	291	dnl #
	292	dnl # CONFIG_PREEMPT - Preempt kernels require special handling.
c9c0d073 BB	293	dnl #
	294	dnl # There are certain kernel build options which when enabled are
	295	dnl # completely incompatible with non GPL kernel modules. It is best
	296	dnl # to detect these at configure time and fail with a clear error
	297	dnl # rather than build everything and fail during linking.
	298	dnl #
	299	dnl # CONFIG_DEBUG_LOCK_ALLOC - Maps mutex_lock() to mutex_lock_nested()
	300	dnl #
	301	AC_DEFUN([ZFS_AC_KERNEL_CONFIG], [
	302
15805c77 BB	303	ZFS_LINUX_CONFIG([PREEMPT],
	304	AC_MSG_ERROR([
	305	*** Kernel built with CONFIG_PREEMPT which is not supported.
	306	** You must rebuild your kernel without this option.]), [])
	307
c9c0d073 BB	308	if test "$ZFS_META_LICENSE" = CDDL; then
	309	ZFS_LINUX_CONFIG([DEBUG_LOCK_ALLOC],
	310	AC_MSG_ERROR([
	311	*** Kernel built with CONFIG_DEBUG_LOCK_ALLOC which is
	312	*** incompatible with the CDDL license. You must rebuild
	313	*** your kernel without this option.]), [])
	314	fi
	315
	316	if test "$ZFS_META_LICENSE" = GPL; then
	317	AC_DEFINE([HAVE_GPL_ONLY_SYMBOLS], [1],
	318	[Define to 1 if licensed under the GPL])
	319	fi
	320	])
	321
	322	dnl #
	323	dnl # ZFS_LINUX_CONFTEST
	324	dnl #
	325	AC_DEFUN([ZFS_LINUX_CONFTEST], [
	326	cat confdefs.h - <<_ACEOF >conftest.c
	327	$1
	328	_ACEOF
	329	])
	330
	331	dnl #
	332	dnl # ZFS_LANG_PROGRAM(C)([PROLOGUE], [BODY])
	333	dnl #
	334	m4_define([ZFS_LANG_PROGRAM], [
	335	$1
	336	int
	337	main (void)
	338	{
	339	dnl Do not indent the following line: there may be CPP directives.
	340	dnl Don't move the `;' right after for the same reason.
	341	$2
	342	;
	343	return 0;
	344	}
	345	])
	346
	347	dnl #
	348	dnl # ZFS_LINUX_COMPILE_IFELSE / like AC_COMPILE_IFELSE
	349	dnl #
	350	AC_DEFUN([ZFS_LINUX_COMPILE_IFELSE], [
	351	m4_ifvaln([$1], [ZFS_LINUX_CONFTEST([$1])])
	352	rm -Rf build && mkdir -p build
	353	echo "obj-m := conftest.o" >build/Makefile
	354	AS_IF(
	355	[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])],
	356	[$4],
	357	[_AC_MSG_LOG_CONFTEST m4_ifvaln([$5],[$5])]
	358	)
	359	rm -Rf build
	360	])
	361
	362	dnl #
	363	dnl # ZFS_LINUX_TRY_COMPILE like AC_TRY_COMPILE
	364	dnl #
	365	AC_DEFUN([ZFS_LINUX_TRY_COMPILE],
	366	[ZFS_LINUX_COMPILE_IFELSE(
	367	[AC_LANG_SOURCE([ZFS_LANG_PROGRAM([[$1]], [[$2]])])],
	368	[modules],
	369	[test -s build/conftest.o],
	370	[$3], [$4])
	371	])
372
373	dnl #
374	dnl # ZFS_LINUX_CONFIG
375	dnl #
376	AC_DEFUN([ZFS_LINUX_CONFIG],
377	[AC_MSG_CHECKING([whether Linux was built with CONFIG_$1])
378	ZFS_LINUX_TRY_COMPILE([
379	#ifndef AUTOCONF_INCLUDED
380	#include <linux/config.h>
381	#endif
382	],[
383	#ifndef CONFIG_$1
384	#error CONFIG_$1 not #defined
385	#endif
386	],[
387	AC_MSG_RESULT([yes])
388	$2
389	],[
390	AC_MSG_RESULT([no])
391	$3
392	])
393	])
394
395	dnl #
396	dnl # ZFS_CHECK_SYMBOL_EXPORT
397	dnl # check symbol exported or not
398	dnl #
399	AC_DEFUN([ZFS_CHECK_SYMBOL_EXPORT],
400	[AC_MSG_CHECKING([whether symbol $1 is exported])
401	grep -q -E '[[[:space:]]]$1[[[:space:]]]' \
402	$LINUX_OBJ/$LINUX_SYMBOLS 2>/dev/null
403	rc=$?
404	if test $rc -ne 0; then
405	export=0
406	for file in $2; do
407	grep -q -E "EXPORT_SYMBOL.*($1)" "$LINUX/$file" 2>/dev/null
408	rc=$?
409	if test $rc -eq 0; then
410	export=1
411	break;
412	fi
413	done
414	if test $export -eq 0; then
415	AC_MSG_RESULT([no])
416	$4
417	else
418	AC_MSG_RESULT([yes])
419	$3
420	fi
421	else
422	AC_MSG_RESULT([yes])
423	$3
424	fi
425	])