block: let elv_register() return void

elv_register() always returns 0, and there isn't anything it does where
it should return an error (the only error condition is so grave that
it's handled with a BUG_ON).

Signed-off-by: Adrian Bunk <[e-mail]>
Signed-off-by: Jens Axboe <[e-mail]>

block/as-iosched.c

···
 
 static int __init as_init(void)
 {
-	return elv_register(&iosched_as);
+	elv_register(&iosched_as);
+
+	return 0;
 }
 
 static void __exit as_exit(void)

block/cfq-iosched.c

···
 
 static int __init cfq_init(void)
 {
-	int ret;
-
 	/*
 	 * could be 0 on HZ < 1000 setups
 	 */
···
 	if (cfq_slab_setup())
 		return -ENOMEM;
 
-	ret = elv_register(&iosched_cfq);
-	if (ret)
-		cfq_slab_kill();
+	elv_register(&iosched_cfq);
 
-	return ret;
+	return 0;
 }
 
 static void __exit cfq_exit(void)

block/deadline-iosched.c

···
 
 static int __init deadline_init(void)
 {
-	return elv_register(&iosched_deadline);
+	elv_register(&iosched_deadline);
+
+	return 0;
 }
 
 static void __exit deadline_exit(void)

block/elevator.c

···
 		__elv_unregister_queue(q->elevator);
 }
 
-int elv_register(struct elevator_type *e)
+void elv_register(struct elevator_type *e)
 {
 	char *def = "";
 
···
 				def = " (default)";
 
 	printk(KERN_INFO "io scheduler %s registered%s\n", e->elevator_name, def);
-	return 0;
 }
 EXPORT_SYMBOL_GPL(elv_register);
 

block/noop-iosched.c

···
 
 static int __init noop_init(void)
 {
-	return elv_register(&elevator_noop);
+	elv_register(&elevator_noop);
+
+	return 0;
 }
 
 static void __exit noop_exit(void)

include/linux/elevator.h

···
 /*
  * io scheduler registration
  */
-extern int elv_register(struct elevator_type *);
+extern void elv_register(struct elevator_type *);
 extern void elv_unregister(struct elevator_type *);
 
 /*