config/kernel-discard-granularity.m4

   1 dnl #
   2 dnl # 2.6.33 API change
   3 dnl # Discard granularity and alignment restrictions may now be set.
   4 dnl #
   5 AC_DEFUN([ZFS_AC_KERNEL_DISCARD_GRANULARITY], [
   6         AC_MSG_CHECKING([whether ql->discard_granularity is available])
   7         ZFS_LINUX_TRY_COMPILE([
   8                 #include <linux/blkdev.h>
   9         ],[
  10                 struct queue_limits ql __attribute__ ((unused));
  11
  12                 ql.discard_granularity = 0;
  13         ],[
  14                 AC_MSG_RESULT(yes)
  15                 AC_DEFINE(HAVE_DISCARD_GRANULARITY, 1,
  16                           [ql->discard_granularity is available])
  17         ],[
  18                 AC_MSG_RESULT(no)
  19         ])
  20 ])