config/kernel-blk-queue-bdi.m4

   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 ])