config/kernel-elevator-change.m4

   1 dnl #
   2 dnl # 2.6.36 API, exported elevator_change() symbol
   3 dnl # 4.12 API, removed elevator_change() symbol
   4 dnl #
   5 AC_DEFUN([ZFS_AC_KERNEL_ELEVATOR_CHANGE], [
   6         AC_MSG_CHECKING([whether elevator_change() is available])
   7         tmp_flags="$EXTRA_KCFLAGS"
   8         EXTRA_KCFLAGS="${NO_UNUSED_BUT_SET_VARIABLE}"
   9         ZFS_LINUX_TRY_COMPILE([
  10                 #include <linux/blkdev.h>
  11                 #include <linux/elevator.h>
  12         ],[
  13                 int ret;
  14                 struct request_queue *q = NULL;
  15                 char *elevator = NULL;
  16                 ret = elevator_change(q, elevator);
  17         ],[
  18                 AC_MSG_RESULT(yes)
  19                 AC_DEFINE(HAVE_ELEVATOR_CHANGE, 1,
  20                           [elevator_change() is available])
  21         ],[
  22                 AC_MSG_RESULT(no)
  23         ])
  24         EXTRA_KCFLAGS="$tmp_flags"
  25 ])