[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_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

	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="$KERNELCPPFLAGS -DHAVE_SPL -D_KERNEL"
	KERNELCPPFLAGS="$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 $modpost; then
			LINUX_SYMBOLS=Modules.symvers
		else
			LINUX_SYMBOLS=Module.symvers
		fi
	else
		LINUX_SYMBOLS=NONE
	fi
	AC_MSG_RESULT($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 # 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], [

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