[mirror_zfs-debian.git] / config / kernel-blk-queue-physical-block-size.m4

dnl #
dnl # 2.6.30 API change
dnl # The blk_queue_physical_block_size() function was introduced to
dnl # indicate the smallest I/O the device can write without incurring
dnl # a read-modify-write penalty.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE_PHYSICAL_BLOCK_SIZE], [
	AC_MSG_CHECKING([whether blk_queue_physical_block_size() is available])
	tmp_flags="$EXTRA_KCFLAGS"
	EXTRA_KCFLAGS="-Wno-unused-but-set-variable"
	ZFS_LINUX_TRY_COMPILE([
		#include <linux/blkdev.h>
	],[
		struct request_queue *q = NULL;
		unsigned short block_size = 1;
		(void) blk_queue_physical_block_size(q, block_size);
	],[
		AC_MSG_RESULT(yes)
		AC_DEFINE(HAVE_BLK_QUEUE_PHYSICAL_BLOCK_SIZE, 1,
		          [blk_queue_physical_block_size() is available])
	],[
		AC_MSG_RESULT(no)
	])
	EXTRA_KCFLAGS="$tmp_flags"
])
Commit	Line	Data
34037afe ED	1	dnl #
	2	dnl # 2.6.30 API change
	3	dnl # The blk_queue_physical_block_size() function was introduced to
	4	dnl # indicate the smallest I/O the device can write without incurring
	5	dnl # a read-modify-write penalty.
	6	dnl #
	7	AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE_PHYSICAL_BLOCK_SIZE], [
	8	AC_MSG_CHECKING([whether blk_queue_physical_block_size() is available])
	9	tmp_flags="$EXTRA_KCFLAGS"
	10	EXTRA_KCFLAGS="-Wno-unused-but-set-variable"
	11	ZFS_LINUX_TRY_COMPILE([
	12	#include <linux/blkdev.h>
	13	],[
	14	struct request_queue *q = NULL;
	15	unsigned short block_size = 1;
	16	(void) blk_queue_physical_block_size(q, block_size);
	17	],[
	18	AC_MSG_RESULT(yes)
	19	AC_DEFINE(HAVE_BLK_QUEUE_PHYSICAL_BLOCK_SIZE, 1,
	20	[blk_queue_physical_block_size() is available])
	21	],[
	22	AC_MSG_RESULT(no)
	23	])
	24	EXTRA_KCFLAGS="$tmp_flags"
	25	])