diff --git a/[refs] b/[refs]
index 8b898abea27f..71060470d918 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 9d5f09a424a67ddb959829894efb4c71cbf6d600
+refs/heads/master: 4722dc52a891ab6cb2d637ddb87233e0ce277827
diff --git a/trunk/block/elevator.c b/trunk/block/elevator.c
index 980f8ae147b4..902dd1344d56 100644
--- a/trunk/block/elevator.c
+++ b/trunk/block/elevator.c
@@ -1110,6 +1110,8 @@ static int elevator_switch(struct request_queue *q, struct elevator_type *new_e)
 	queue_flag_clear(QUEUE_FLAG_ELVSWITCH, q);
 	spin_unlock_irq(q->queue_lock);
 
+	blk_add_trace_msg(q, "elv switch: %s", e->elevator_type->elevator_name);
+
 	return 1;
 
 fail_register: