[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
	ZFS_AC_KERNEL_TRUNCATE_SETSIZE
	ZFS_AC_KERNEL_6ARGS_SECURITY_INODE_INIT_SECURITY
	ZFS_AC_KERNEL_MOUNT_NODEV

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


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

	AC_SUBST(KERNELCPPFLAGS)
])

dnl #
dnl # Detect name used for Module.symvers file in kernel
dnl #
AC_DEFUN([ZFS_AC_MODULE_SYMVERS], [
	modpost=$LINUX/scripts/Makefile.modpost
	AC_MSG_CHECKING([kernel file name for module symbols])
	if test -f "$modpost"; then
		if grep -q Modules.symvers $modpost; then
			LINUX_SYMBOLS=Modules.symvers
		else
			LINUX_SYMBOLS=Module.symvers
		fi

		if ! test -f "$LINUX_OBJ/$LINUX_SYMBOLS"; then
			AC_MSG_ERROR([
	*** Please make sure the kernel devel package for your distribution
	*** is installed.  If your building with a custom kernel make sure the
	*** kernel is configured, built, and the '--with-linux=PATH' configure
	*** option refers to the location of the kernel source.])
		fi
	else
		LINUX_SYMBOLS=NONE
	fi
	AC_MSG_RESULT($LINUX_SYMBOLS)
	AC_SUBST(LINUX_SYMBOLS)
])

dnl #
dnl # Detect the kernel to be built against
dnl #
AC_DEFUN([ZFS_AC_KERNEL], [
	AC_ARG_WITH([linux],
		AS_HELP_STRING([--with-linux=PATH],
		[Path to kernel source]),
		[kernelsrc="$withval"])

	AC_ARG_WITH(linux-obj,
		AS_HELP_STRING([--with-linux-obj=PATH],
		[Path to kernel build objects]),
		[kernelbuild="$withval"])

	AC_MSG_CHECKING([kernel source directory])
	if test -z "$kernelsrc"; then
		if test -e "/lib/modules/$(uname -r)/source"; then
			headersdir="/lib/modules/$(uname -r)/source"
			sourcelink=$(readlink -f "$headersdir")
		elif test -e "/lib/modules/$(uname -r)/build"; then
			headersdir="/lib/modules/$(uname -r)/build"
			sourcelink=$(readlink -f "$headersdir")
		else
			sourcelink=$(ls -1d /usr/src/kernels/* \
				     /usr/src/linux-* \
			             2>/dev/null | grep -v obj | tail -1)
		fi

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

	AC_MSG_RESULT([$kernelsrc])
	AC_MSG_CHECKING([kernel build directory])
	if test -z "$kernelbuild"; then
		if test -e "/lib/modules/$(uname -r)/build"; then
			kernelbuild=`readlink -f /lib/modules/$(uname -r)/build`
		elif test -d ${kernelsrc}-obj/${target_cpu}/${target_cpu}; then
			kernelbuild=${kernelsrc}-obj/${target_cpu}/${target_cpu}
		elif test -d ${kernelsrc}-obj/${target_cpu}/default; then
		        kernelbuild=${kernelsrc}-obj/${target_cpu}/default
		elif test -d `dirname ${kernelsrc}`/build-${target_cpu}; then
			kernelbuild=`dirname ${kernelsrc}`/build-${target_cpu}
		else
			kernelbuild=${kernelsrc}
		fi
	fi
	AC_MSG_RESULT([$kernelbuild])

	AC_MSG_CHECKING([kernel source version])
	utsrelease1=$kernelbuild/include/linux/version.h
	utsrelease2=$kernelbuild/include/linux/utsrelease.h
	utsrelease3=$kernelbuild/include/generated/utsrelease.h
	if test -r $utsrelease1 && fgrep -q UTS_RELEASE $utsrelease1; then
		utsrelease=linux/version.h
	elif test -r $utsrelease2 && fgrep -q UTS_RELEASE $utsrelease2; then
		utsrelease=linux/utsrelease.h
	elif test -r $utsrelease3 && fgrep -q UTS_RELEASE $utsrelease3; then
		utsrelease=generated/utsrelease.h
	fi

	if test "$utsrelease"; then
		kernsrcver=`(echo "#include <$utsrelease>";
		             echo "kernsrcver=UTS_RELEASE") |
		             cpp -I $kernelbuild/include |
		             grep "^kernsrcver=" | cut -d \" -f 2`

		if test -z "$kernsrcver"; then
			AC_MSG_RESULT([Not found])
			AC_MSG_ERROR([*** Cannot determine kernel version.])
		fi
	else
		AC_MSG_RESULT([Not found])
		AC_MSG_ERROR([*** Cannot find UTS_RELEASE definition.])
	fi

	AC_MSG_RESULT([$kernsrcver])

	LINUX=${kernelsrc}
	LINUX_OBJ=${kernelbuild}
	LINUX_VERSION=${kernsrcver}

	AC_SUBST(LINUX)
	AC_SUBST(LINUX_OBJ)
	AC_SUBST(LINUX_VERSION)

	ZFS_AC_MODULE_SYMVERS
])

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

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

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

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


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

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

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

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

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

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

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

	AC_MSG_RESULT([$splsrcver])

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

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

	ZFS_AC_SPL_MODULE_SYMVERS
])

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

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

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

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

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

dnl #
dnl # ZFS_LANG_PROGRAM(C)([PROLOGUE], [BODY])
dnl #
m4_define([ZFS_LANG_PROGRAM], [
$1
int
main (void)
{
dnl Do *not* indent the following line: there may be CPP directives.
dnl Don't move the `;' right after for the same reason.
$2
  ;
  return 0;
}
])

dnl #
dnl # ZFS_LINUX_COMPILE_IFELSE / like AC_COMPILE_IFELSE
dnl #
AC_DEFUN([ZFS_LINUX_COMPILE_IFELSE], [
	m4_ifvaln([$1], [ZFS_LINUX_CONFTEST([$1])])
	rm -Rf build && mkdir -p build
	echo "obj-m := conftest.o" >build/Makefile
	AS_IF(
		[AC_TRY_COMMAND(cp conftest.c build && make [$2] -C $LINUX_OBJ EXTRA_CFLAGS="-Werror-implicit-function-declaration $EXTRA_KCFLAGS" $ARCH_UM M=$PWD/build) >/dev/null && AC_TRY_COMMAND([$3])],
		[$4],
		[_AC_MSG_LOG_CONFTEST m4_ifvaln([$5],[$5])]
	)
	rm -Rf build
])

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

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

dnl #
dnl # ZFS_CHECK_SYMBOL_EXPORT
dnl # check symbol exported or not
dnl #
AC_DEFUN([ZFS_CHECK_SYMBOL_EXPORT],
	[AC_MSG_CHECKING([whether symbol $1 is exported])
	grep -q -E '[[[:space:]]]$1[[[:space:]]]' \
		$LINUX_OBJ/$LINUX_SYMBOLS 2>/dev/null
	rc=$?
	if test $rc -ne 0; then
		export=0
		for file in $2; do
			grep -q -E "EXPORT_SYMBOL.*($1)" "$LINUX/$file" 2>/dev/null
			rc=$?
		        if test $rc -eq 0; then
		                export=1
		                break;
		        fi
		done
		if test $export -eq 0; then
			AC_MSG_RESULT([no])
			$4
		else
			AC_MSG_RESULT([yes])
			$3
		fi
	else
		AC_MSG_RESULT([yes])
		$3
	fi
])
Commit	Line	Data
c9c0d073 BB	1	dnl #
	2	dnl # Default ZFS kernel configuration
	3	dnl #
	4	AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
	5	ZFS_AC_KERNEL
	6	ZFS_AC_SPL
	7	ZFS_AC_KERNEL_CONFIG
	8	ZFS_AC_KERNEL_BDEV_BLOCK_DEVICE_OPERATIONS
	9	ZFS_AC_KERNEL_TYPE_FMODE_T
	10	ZFS_AC_KERNEL_KOBJ_NAME_LEN
45066d1f	11	ZFS_AC_KERNEL_BLKDEV_GET_BY_PATH
c9c0d073 BB	12	ZFS_AC_KERNEL_OPEN_BDEV_EXCLUSIVE
	13	ZFS_AC_KERNEL_INVALIDATE_BDEV_ARGS
	14	ZFS_AC_KERNEL_BDEV_LOGICAL_BLOCK_SIZE
	15	ZFS_AC_KERNEL_BIO_EMPTY_BARRIER
2959d94a	16	ZFS_AC_KERNEL_BIO_FAILFAST
f4af6bb7 BB	17	ZFS_AC_KERNEL_BIO_FAILFAST_DTD
f4af6bb7 BB	18	ZFS_AC_KERNEL_REQ_FAILFAST_MASK
c9c0d073	19	ZFS_AC_KERNEL_BIO_END_IO_T_ARGS
675de5aa	20	ZFS_AC_KERNEL_BIO_RW_SYNC
c9c0d073	21	ZFS_AC_KERNEL_BIO_RW_SYNCIO
675de5aa	22	ZFS_AC_KERNEL_REQ_SYNC
c9c0d073 BB	23	ZFS_AC_KERNEL_BLK_END_REQUEST
	24	ZFS_AC_KERNEL_BLK_FETCH_REQUEST
	25	ZFS_AC_KERNEL_BLK_REQUEUE_REQUEST
	26	ZFS_AC_KERNEL_BLK_RQ_BYTES
	27	ZFS_AC_KERNEL_BLK_RQ_POS
	28	ZFS_AC_KERNEL_BLK_RQ_SECTORS
	29	ZFS_AC_KERNEL_GET_DISK_RO
	30	ZFS_AC_KERNEL_RQ_IS_SYNC
	31	ZFS_AC_KERNEL_RQ_FOR_EACH_SEGMENT
777d4af8	32	ZFS_AC_KERNEL_CONST_XATTR_HANDLER
f9637c6c BB	33	ZFS_AC_KERNEL_XATTR_HANDLER_GET
f9637c6c BB	34	ZFS_AC_KERNEL_XATTR_HANDLER_SET
7268e1be	35	ZFS_AC_KERNEL_FSYNC_2ARGS
2c395def	36	ZFS_AC_KERNEL_EVICT_INODE
bdf4328b	37	ZFS_AC_KERNEL_INSERT_INODE_LOCKED
055656d4	38	ZFS_AC_KERNEL_D_OBTAIN_ALIAS
df554c14	39	ZFS_AC_KERNEL_CHECK_DISK_SIZE_CHANGE
b3129792	40	ZFS_AC_KERNEL_TRUNCATE_SETSIZE
5c03efc3	41	ZFS_AC_KERNEL_6ARGS_SECURITY_INODE_INIT_SECURITY
2cf7f52b	42	ZFS_AC_KERNEL_MOUNT_NODEV
c9c0d073	43
6283f55e BB	44	if test "$LINUX_OBJ" != "$LINUX"; then
	45	KERNELMAKE_PARAMS="$KERNELMAKE_PARAMS O=$LINUX_OBJ"
	46	fi
	47	AC_SUBST(KERNELMAKE_PARAMS)
	48
	49
c9c0d073 BB	50	dnl # -Wall -fno-strict-aliasing -Wstrict-prototypes and other
c9c0d073 BB	51	dnl # compiler options are added by the kernel build system.
8a7e1cee	52	KERNELCPPFLAGS="$KERNELCPPFLAGS $NO_UNUSED_BUT_SET_VARIABLE"
c9c0d073 BB	53	KERNELCPPFLAGS="$KERNELCPPFLAGS -DHAVE_SPL -D_KERNEL"
c9c0d073 BB	54	KERNELCPPFLAGS="$KERNELCPPFLAGS -DTEXT_DOMAIN=\\\"zfs-linux-kernel\\\""
c9c0d073	55
c9c0d073 BB	56	AC_SUBST(KERNELCPPFLAGS)
	57	])
	58
	59	dnl #
	60	dnl # Detect name used for Module.symvers file in kernel
	61	dnl #
	62	AC_DEFUN([ZFS_AC_MODULE_SYMVERS], [
	63	modpost=$LINUX/scripts/Makefile.modpost
	64	AC_MSG_CHECKING([kernel file name for module symbols])
	65	if test -f "$modpost"; then
	66	if grep -q Modules.symvers $modpost; then
	67	LINUX_SYMBOLS=Modules.symvers
	68	else
	69	LINUX_SYMBOLS=Module.symvers
	70	fi
a60b1c0a BB	71
	72	if ! test -f "$LINUX_OBJ/$LINUX_SYMBOLS"; then
	73	AC_MSG_ERROR([
	74	*** Please make sure the kernel devel package for your distribution
	75	*** is installed. If your building with a custom kernel make sure the
	76	*** kernel is configured, built, and the '--with-linux=PATH' configure
	77	*** option refers to the location of the kernel source.])
	78	fi
c9c0d073 BB	79	else
	80	LINUX_SYMBOLS=NONE
	81	fi
	82	AC_MSG_RESULT($LINUX_SYMBOLS)
	83	AC_SUBST(LINUX_SYMBOLS)
	84	])
	85
	86	dnl #
	87	dnl # Detect the kernel to be built against
	88	dnl #
	89	AC_DEFUN([ZFS_AC_KERNEL], [
	90	AC_ARG_WITH([linux],
	91	AS_HELP_STRING([--with-linux=PATH],
	92	[Path to kernel source]),
	93	[kernelsrc="$withval"])
	94
	95	AC_ARG_WITH(linux-obj,
	96	AS_HELP_STRING([--with-linux-obj=PATH],
	97	[Path to kernel build objects]),
	98	[kernelbuild="$withval"])
	99
	100	AC_MSG_CHECKING([kernel source directory])
	101	if test -z "$kernelsrc"; then
1b94c25c BB	102	if test -e "/lib/modules/$(uname -r)/source"; then
	103	headersdir="/lib/modules/$(uname -r)/source"
	104	sourcelink=$(readlink -f "$headersdir")
	105	elif test -e "/lib/modules/$(uname -r)/build"; then
	106	headersdir="/lib/modules/$(uname -r)/build"
c9c0d073 BB	107	sourcelink=$(readlink -f "$headersdir")
	108	else
	109	sourcelink=$(ls -1d /usr/src/kernels/* \
	110	/usr/src/linux-* \
	111	2>/dev/null \| grep -v obj \| tail -1)
	112	fi
	113
	114	if test -n "$sourcelink" && test -e ${sourcelink}; then
	115	kernelsrc=`readlink -f ${sourcelink}`
	116	else
	117	AC_MSG_RESULT([Not found])
	118	AC_MSG_ERROR([
	119	*** Please make sure the kernel devel package for your distribution
	120	*** is installed then try again. If that fails you can specify the
	121	*** location of the kernel source with the '--with-linux=PATH' option.])
	122	fi
	123	else
	124	if test "$kernelsrc" = "NONE"; then
	125	kernsrcver=NONE
	126	fi
	127	fi
	128
	129	AC_MSG_RESULT([$kernelsrc])
	130	AC_MSG_CHECKING([kernel build directory])
	131	if test -z "$kernelbuild"; then
1b94c25c BB	132	if test -e "/lib/modules/$(uname -r)/build"; then
	133	kernelbuild=`readlink -f /lib/modules/$(uname -r)/build`
	134	elif test -d ${kernelsrc}-obj/${target_cpu}/${target_cpu}; then
c9c0d073 BB	135	kernelbuild=${kernelsrc}-obj/${target_cpu}/${target_cpu}
	136	elif test -d ${kernelsrc}-obj/${target_cpu}/default; then
	137	kernelbuild=${kernelsrc}-obj/${target_cpu}/default
	138	elif test -d `dirname ${kernelsrc}`/build-${target_cpu}; then
	139	kernelbuild=`dirname ${kernelsrc}`/build-${target_cpu}
	140	else
	141	kernelbuild=${kernelsrc}
	142	fi
	143	fi
	144	AC_MSG_RESULT([$kernelbuild])
	145
	146	AC_MSG_CHECKING([kernel source version])
	147	utsrelease1=$kernelbuild/include/linux/version.h
	148	utsrelease2=$kernelbuild/include/linux/utsrelease.h
	149	utsrelease3=$kernelbuild/include/generated/utsrelease.h
	150	if test -r $utsrelease1 && fgrep -q UTS_RELEASE $utsrelease1; then
	151	utsrelease=linux/version.h
	152	elif test -r $utsrelease2 && fgrep -q UTS_RELEASE $utsrelease2; then
	153	utsrelease=linux/utsrelease.h
	154	elif test -r $utsrelease3 && fgrep -q UTS_RELEASE $utsrelease3; then
	155	utsrelease=generated/utsrelease.h
	156	fi
	157
	158	if test "$utsrelease"; then
	159	kernsrcver=`(echo "#include <$utsrelease>";
	160	echo "kernsrcver=UTS_RELEASE") \|
	161	cpp -I $kernelbuild/include \|
	162	grep "^kernsrcver=" \| cut -d \" -f 2`
	163
	164	if test -z "$kernsrcver"; then
	165	AC_MSG_RESULT([Not found])
	166	AC_MSG_ERROR([*** Cannot determine kernel version.])
	167	fi
	168	else
	169	AC_MSG_RESULT([Not found])
	170	AC_MSG_ERROR([*** Cannot find UTS_RELEASE definition.])
	171	fi
	172
	173	AC_MSG_RESULT([$kernsrcver])
	174
	175	LINUX=${kernelsrc}
	176	LINUX_OBJ=${kernelbuild}
	177	LINUX_VERSION=${kernsrcver}
	178
	179	AC_SUBST(LINUX)
	180	AC_SUBST(LINUX_OBJ)
	181	AC_SUBST(LINUX_VERSION)
	182
	183	ZFS_AC_MODULE_SYMVERS
	184	])
	185
	186	dnl #
	187	dnl # Detect name used for the additional SPL Module.symvers file. If one
	188	dnl # does not exist this is likely because the SPL has been configured
	189	dnl # but not built. To allow recursive builds a good guess is made as to
	190	dnl # what this file will be named based on what it is named in the kernel
	191	dnl # build products. This file will first be used at link time so if
	192	dnl # the guess is wrong the build will fail then. This unfortunately
	193	dnl # means the ZFS package does not contain a reliable mechanism to
	194	dnl # detect symbols exported by the SPL at configure time.
	195	dnl #
	196	AC_DEFUN([ZFS_AC_SPL_MODULE_SYMVERS], [
	197	AC_MSG_CHECKING([spl file name for module symbols])
	198	if test -r $SPL_OBJ/Module.symvers; then
199	SPL_SYMBOLS=Module.symvers
200	elif test -r $SPL_OBJ/Modules.symvers; then
201	SPL_SYMBOLS=Modules.symvers
6283f55e BB	202	elif test -r $SPL_OBJ/module/Module.symvers; then
	203	SPL_SYMBOLS=Module.symvers
	204	elif test -r $SPL_OBJ/module/Modules.symvers; then
	205	SPL_SYMBOLS=Modules.symvers
c9c0d073 BB	206	else
	207	SPL_SYMBOLS=$LINUX_SYMBOLS
	208	fi
	209
	210	AC_MSG_RESULT([$SPL_SYMBOLS])
	211	AC_SUBST(SPL_SYMBOLS)
	212	])
	213
	214	dnl #
	215	dnl # Detect the SPL module to be built against
	216	dnl #
	217	AC_DEFUN([ZFS_AC_SPL], [
	218	AC_ARG_WITH([spl],
	219	AS_HELP_STRING([--with-spl=PATH],
	220	[Path to spl source]),
	221	[splsrc="$withval"])
	222
	223	AC_ARG_WITH([spl-obj],
	224	AS_HELP_STRING([--with-spl-obj=PATH],
	225	[Path to spl build objects]),
	226	[splbuild="$withval"])
	227
	228
	229	AC_MSG_CHECKING([spl source directory])
	230	if test -z "$splsrc"; then
	231	sourcelink=`ls -1d /usr/src/spl-*/${LINUX_VERSION} \
	232	2>/dev/null \| tail -1`
	233
	234	if test -z "$sourcelink" \|\| test ! -e $sourcelink; then
	235	sourcelink=../spl
	236	fi
	237
	238	if test -e $sourcelink; then
	239	splsrc=`readlink -f ${sourcelink}`
	240	else
	241	AC_MSG_RESULT([Not found])
	242	AC_MSG_ERROR([
	243	*** Please make sure the spl devel package for your distribution
	244	*** is installed then try again. If that fails you can specify the
	245	*** location of the spl source with the '--with-spl=PATH' option.])
	246	fi
	247	else
	248	if test "$splsrc" = "NONE"; then
	249	splbuild=NONE
	250	splsrcver=NONE
	251	fi
	252	fi
	253
	254	AC_MSG_RESULT([$splsrc])
	255	AC_MSG_CHECKING([spl build directory])
	256	if test -z "$splbuild"; then
6283f55e	257	splbuild=${splsrc}
c9c0d073 BB	258	fi
	259	AC_MSG_RESULT([$splbuild])
	260
	261	AC_MSG_CHECKING([spl source version])
5e612145 BB	262	if test -r $splbuild/spl_config.h &&
5e612145 BB	263	fgrep -q SPL_META_VERSION $splbuild/spl_config.h; then
c9c0d073 BB	264
	265	splsrcver=`(echo "#include <spl_config.h>";
	266	echo "splsrcver=SPL_META_VERSION") \|
5e612145	267	cpp -I $splbuild \|
c9c0d073 BB	268	grep "^splsrcver=" \| cut -d \" -f 2`
	269	fi
	270
	271	if test -z "$splsrcver"; then
	272	AC_MSG_RESULT([Not found])
	273	AC_MSG_ERROR([
	274	*** Cannot determine the version of the spl source.
	275	*** Please prepare the spl source before running this script])
	276	fi
	277
	278	AC_MSG_RESULT([$splsrcver])
	279
	280	SPL=${splsrc}
	281	SPL_OBJ=${splbuild}
	282	SPL_VERSION=${splsrcver}
	283
	284	AC_SUBST(SPL)
	285	AC_SUBST(SPL_OBJ)
	286	AC_SUBST(SPL_VERSION)
	287
	288	ZFS_AC_SPL_MODULE_SYMVERS
	289	])
	290
15805c77 BB	291	dnl #
	292	dnl # Certain kernel build options are not supported. These must be
	293	dnl # detected at configure time and cause a build failure. Otherwise
	294	dnl # modules may be successfully built that behave incorrectly.
	295	dnl #
	296	dnl # CONFIG_PREEMPT - Preempt kernels require special handling.
c9c0d073 BB	297	dnl #
	298	dnl # There are certain kernel build options which when enabled are
	299	dnl # completely incompatible with non GPL kernel modules. It is best
	300	dnl # to detect these at configure time and fail with a clear error
	301	dnl # rather than build everything and fail during linking.
	302	dnl #
	303	dnl # CONFIG_DEBUG_LOCK_ALLOC - Maps mutex_lock() to mutex_lock_nested()
	304	dnl #
	305	AC_DEFUN([ZFS_AC_KERNEL_CONFIG], [
	306
15805c77 BB	307	ZFS_LINUX_CONFIG([PREEMPT],
	308	AC_MSG_ERROR([
	309	*** Kernel built with CONFIG_PREEMPT which is not supported.
	310	** You must rebuild your kernel without this option.]), [])
	311
c9c0d073 BB	312	if test "$ZFS_META_LICENSE" = CDDL; then
	313	ZFS_LINUX_CONFIG([DEBUG_LOCK_ALLOC],
	314	AC_MSG_ERROR([
	315	*** Kernel built with CONFIG_DEBUG_LOCK_ALLOC which is
	316	*** incompatible with the CDDL license. You must rebuild
	317	*** your kernel without this option.]), [])
	318	fi
	319
	320	if test "$ZFS_META_LICENSE" = GPL; then
	321	AC_DEFINE([HAVE_GPL_ONLY_SYMBOLS], [1],
	322	[Define to 1 if licensed under the GPL])
	323	fi
	324	])
	325
	326	dnl #
	327	dnl # ZFS_LINUX_CONFTEST
	328	dnl #
	329	AC_DEFUN([ZFS_LINUX_CONFTEST], [
	330	cat confdefs.h - <<_ACEOF >conftest.c
	331	$1
	332	_ACEOF
	333	])
	334
	335	dnl #
	336	dnl # ZFS_LANG_PROGRAM(C)([PROLOGUE], [BODY])
	337	dnl #
	338	m4_define([ZFS_LANG_PROGRAM], [
	339	$1
	340	int
	341	main (void)
	342	{
	343	dnl Do not indent the following line: there may be CPP directives.
	344	dnl Don't move the `;' right after for the same reason.
	345	$2
	346	;
	347	return 0;
	348	}
	349	])
	350
	351	dnl #
	352	dnl # ZFS_LINUX_COMPILE_IFELSE / like AC_COMPILE_IFELSE
	353	dnl #
	354	AC_DEFUN([ZFS_LINUX_COMPILE_IFELSE], [
	355	m4_ifvaln([$1], [ZFS_LINUX_CONFTEST([$1])])
	356	rm -Rf build && mkdir -p build
	357	echo "obj-m := conftest.o" >build/Makefile
	358	AS_IF(
	359	[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])],
	360	[$4],
	361	[_AC_MSG_LOG_CONFTEST m4_ifvaln([$5],[$5])]
	362	)
	363	rm -Rf build
	364	])
	365
	366	dnl #
	367	dnl # ZFS_LINUX_TRY_COMPILE like AC_TRY_COMPILE
	368	dnl #
	369	AC_DEFUN([ZFS_LINUX_TRY_COMPILE],
	370	[ZFS_LINUX_COMPILE_IFELSE(
	371	[AC_LANG_SOURCE([ZFS_LANG_PROGRAM([[$1]], [[$2]])])],
	372	[modules],
	373	[test -s build/conftest.o],
	374	[$3], [$4])
	375	])
376
377	dnl #
378	dnl # ZFS_LINUX_CONFIG
379	dnl #
380	AC_DEFUN([ZFS_LINUX_CONFIG],
381	[AC_MSG_CHECKING([whether Linux was built with CONFIG_$1])
382	ZFS_LINUX_TRY_COMPILE([
383	#ifndef AUTOCONF_INCLUDED
384	#include <linux/config.h>
385	#endif
386	],[
387	#ifndef CONFIG_$1
388	#error CONFIG_$1 not #defined
389	#endif
390	],[
391	AC_MSG_RESULT([yes])
392	$2
393	],[
394	AC_MSG_RESULT([no])
395	$3
396	])
397	])
398
399	dnl #
400	dnl # ZFS_CHECK_SYMBOL_EXPORT
401	dnl # check symbol exported or not
402	dnl #
403	AC_DEFUN([ZFS_CHECK_SYMBOL_EXPORT],
404	[AC_MSG_CHECKING([whether symbol $1 is exported])
405	grep -q -E '[[[:space:]]]$1[[[:space:]]]' \
406	$LINUX_OBJ/$LINUX_SYMBOLS 2>/dev/null
407	rc=$?
408	if test $rc -ne 0; then
409	export=0
410	for file in $2; do
411	grep -q -E "EXPORT_SYMBOL.*($1)" "$LINUX/$file" 2>/dev/null
412	rc=$?
413	if test $rc -eq 0; then
414	export=1
415	break;
416	fi
417	done
418	if test $export -eq 0; then
419	AC_MSG_RESULT([no])
420	$4
421	else
422	AC_MSG_RESULT([yes])
423	$3
424	fi
425	else
426	AC_MSG_RESULT([yes])
427	$3
428	fi
429	])