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

dnl #
dnl # 2.6.32 API change
dnl # Discard requests were moved to the normal I/O path.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE_DISCARD], [
	AC_MSG_CHECKING([whether blk_queue_discard() 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_discard(q);
	],[
		AC_MSG_RESULT(yes)
		AC_DEFINE(HAVE_BLK_QUEUE_DISCARD, 1,
		          [blk_queue_discard() is available])
	],[
		AC_MSG_RESULT(no)
	])
	EXTRA_KCFLAGS="$tmp_flags"
])
Commit	Line	Data
30930fba ED	1	dnl #
	2	dnl # 2.6.32 API change
	3	dnl # Discard requests were moved to the normal I/O path.
	4	dnl #
	5	AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE_DISCARD], [
	6	AC_MSG_CHECKING([whether blk_queue_discard() is available])
	7	tmp_flags="$EXTRA_KCFLAGS"
e191b54e	8	EXTRA_KCFLAGS="${NO_UNUSED_BUT_SET_VARIABLE}"
30930fba ED	9	ZFS_LINUX_TRY_COMPILE([
	10	#include <linux/blkdev.h>
	11	],[
	12	struct request_queue *q = NULL;
	13	(void) blk_queue_discard(q);
	14	],[
	15	AC_MSG_RESULT(yes)
	16	AC_DEFINE(HAVE_BLK_QUEUE_DISCARD, 1,
	17	[blk_queue_discard() is available])
	18	],[
	19	AC_MSG_RESULT(no)
	20	])
	21	EXTRA_KCFLAGS="$tmp_flags"
	22	])