Modify vdev_elevator_switch() to use elevator_change()

[zfs.git] / config / kernel-elevator-change.m4

diff --git a/config/kernel-elevator-change.m4 b/config/kernel-elevator-change.m4
new file mode 100644 (file)
index 0000000..90ab51b
--- /dev/null
+++ b/config/kernel-elevator-change.m4
@@ -0,0 +1,25 @@
+dnl #
+dnl # 2.6.36 API change
+dnl # Verify the elevator_change() symbol is available.
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_ELEVATOR_CHANGE], [
+       AC_MSG_CHECKING([whether elevator_change() is available])
+       tmp_flags="$EXTRA_KCFLAGS"
+       EXTRA_KCFLAGS="-Wno-unused-but-set-variable"
+       ZFS_LINUX_TRY_COMPILE([
+               #include <linux/blkdev.h>
+               #include <linux/elevator.h>
+       ],[
+               int ret;
+               struct request_queue *q = NULL;
+               char *elevator = NULL;
+               ret = elevator_change(q, elevator);
+       ],[
+               AC_MSG_RESULT(yes)
+               AC_DEFINE(HAVE_ELEVATOR_CHANGE, 1,
+                         [elevator_change() is available])
+       ],[
+               AC_MSG_RESULT(no)
+       ])
+       EXTRA_KCFLAGS="$tmp_flags"
+])