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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)
])
])
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