--- 21a8ebf2dc3a2ab5a899077beaad61aa3e6e4f80
+++ d800d5142184216bab18fb1858452fd896e85612
@@ -146,7 +146,7 @@ extern struct request *elv_rb_latter_req
 /*
  * rb support functions.
  */
-extern struct request *elv_rb_add(struct rb_root *, struct request *);
+extern void elv_rb_add(struct rb_root *, struct request *);
 extern void elv_rb_del(struct rb_root *, struct request *);
 extern struct request *elv_rb_find(struct rb_root *, sector_t);