[PATCH] elevator=as back-compatibility

As of 2.6.15 you need to use "anticipatory" instead of "as".  Fix that up
so that `elevator=as' still works.

Signed-off-by: Chuck Ebbert <76306.1226@compuserve.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Jens Axboe <axboe@suse.de>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 7 insertions, 0 deletions

diff --git a/block/elevator.c b/block/elevator.c
index 1d0759178e4b..e8025b2ec54a 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -149,6 +149,13 @@ static void elevator_setup_default(void)
         if (!chosen_elevator[0])
                 strcpy(chosen_elevator, CONFIG_DEFAULT_IOSCHED);
 
+        /*
+         * Be backwards-compatible with previous kernels, so users
+         * won't get the wrong elevator.
+         */
+        if (!strcmp(chosen_elevator, "as"))
+                strcpy(chosen_elevator, "anticipatory");
+
         /*
          * If the given scheduler is not available, fall back to no-op.
          */