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

dnl #
dnl # 2.6.32 - 4.11, statically allocated bdi in request_queue
dnl # 4.12 - x.y, dynamically allocated bdi in request_queue
dnl #
AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE_BDI], [
	AC_MSG_CHECKING([whether blk_queue bdi is dynamic])
	ZFS_LINUX_TRY_COMPILE([
		#include <linux/blkdev.h>
	],[
		struct request_queue q;
		struct backing_dev_info bdi;
		q.backing_dev_info = &bdi;
	],[
		AC_MSG_RESULT(yes)
		AC_DEFINE(HAVE_BLK_QUEUE_BDI_DYNAMIC, 1,
		    [blk queue backing_dev_info is dynamic])
	],[
		AC_MSG_RESULT(no)
	])
])
Commit	Line	Data
cae5b340 AX	1	dnl #
	2	dnl # 2.6.32 - 4.11, statically allocated bdi in request_queue
	3	dnl # 4.12 - x.y, dynamically allocated bdi in request_queue
	4	dnl #
	5	AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE_BDI], [
	6	AC_MSG_CHECKING([whether blk_queue bdi is dynamic])
	7	ZFS_LINUX_TRY_COMPILE([
	8	#include <linux/blkdev.h>
	9	],[
	10	struct request_queue q;
	11	struct backing_dev_info bdi;
	12	q.backing_dev_info = &bdi;
	13	],[
	14	AC_MSG_RESULT(yes)
	15	AC_DEFINE(HAVE_BLK_QUEUE_BDI_DYNAMIC, 1,
	16	[blk queue backing_dev_info is dynamic])
	17	],[
	18	AC_MSG_RESULT(no)
	19	])
	20	])