[mirror_zfs-debian.git] / config / kernel-blk-queue-max-segments.m4

dnl #
dnl # 2.6.34 API change
dnl # blk_queue_max_segments() consolidates blk_queue_max_hw_segments()
dnl # and blk_queue_max_phys_segments().
dnl #
AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE_MAX_SEGMENTS], [
	AC_MSG_CHECKING([whether blk_queue_max_segments() is available])
	tmp_flags="$EXTRA_KCFLAGS"
	EXTRA_KCFLAGS="${NO_UNUSED_BUT_SET_VARIABLE}"
	ZFS_LINUX_TRY_COMPILE([
		#include <linux/blkdev.h>
	],[
		struct request_queue *q = NULL;
		(void) blk_queue_max_segments(q, BLK_MAX_SEGMENTS);
	],[
		AC_MSG_RESULT(yes)
		AC_DEFINE(HAVE_BLK_QUEUE_MAX_SEGMENTS, 1,
		          [blk_queue_max_segments() is available])
	],[
		AC_MSG_RESULT(no)
	])
	EXTRA_KCFLAGS="$tmp_flags"
])
Commit	Line	Data
34037afe ED	1	dnl #
	2	dnl # 2.6.34 API change
	3	dnl # blk_queue_max_segments() consolidates blk_queue_max_hw_segments()
	4	dnl # and blk_queue_max_phys_segments().
	5	dnl #
	6	AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE_MAX_SEGMENTS], [
	7	AC_MSG_CHECKING([whether blk_queue_max_segments() is available])
	8	tmp_flags="$EXTRA_KCFLAGS"
e191b54e	9	EXTRA_KCFLAGS="${NO_UNUSED_BUT_SET_VARIABLE}"
34037afe ED	10	ZFS_LINUX_TRY_COMPILE([
	11	#include <linux/blkdev.h>
	12	],[
	13	struct request_queue *q = NULL;
	14	(void) blk_queue_max_segments(q, BLK_MAX_SEGMENTS);
	15	],[
	16	AC_MSG_RESULT(yes)
	17	AC_DEFINE(HAVE_BLK_QUEUE_MAX_SEGMENTS, 1,
	18	[blk_queue_max_segments() is available])
	19	],[
	20	AC_MSG_RESULT(no)
	21	])
	22	EXTRA_KCFLAGS="$tmp_flags"
	23	])