block: unexport elevator_init/exit

These are only used by the block core.  Also move the declarations to
block/blk.h.
Reported-by: NDamien Le Moal <Damien.LeMoal@wdc.com>
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NDamien Le Moal <damien.lemoal@wdc.com>
Tested-by: NDamien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: NJens Axboe <axboe@kernel.dk>

block/blk.h

@@ -231,6 +231,8 @@ static inline void elv_deactivate_rq(struct request_queue *q, struct request *rq
 		e->type->ops.sq.elevator_deactivate_req_fn(q, rq);
 }
 
+int elevator_init(struct request_queue *, char *);
+void elevator_exit(struct request_queue *, struct elevator_queue *);
 int elv_register_queue(struct request_queue *q);
 void elv_unregister_queue(struct request_queue *q);
 

block/elevator.c

@@ -263,7 +263,6 @@ int elevator_init(struct request_queue *q, char *name)
 		elevator_put(e);
 	return err;
 }
-EXPORT_SYMBOL(elevator_init);
 
 void elevator_exit(struct request_queue *q, struct elevator_queue *e)
 {
@@ -276,7 +275,6 @@ void elevator_exit(struct request_queue *q, struct elevator_queue *e)
 
 	kobject_put(&e->kobj);
 }
-EXPORT_SYMBOL(elevator_exit);
 
 static inline void __elv_rqhash_del(struct request *rq)
 {

include/linux/elevator.h

@@ -218,8 +218,6 @@ extern void elv_unregister(struct elevator_type *);
 extern ssize_t elv_iosched_show(struct request_queue *, char *);
 extern ssize_t elv_iosched_store(struct request_queue *, const char *, size_t);
 
-extern int elevator_init(struct request_queue *, char *);
-extern void elevator_exit(struct request_queue *, struct elevator_queue *);
 extern bool elv_bio_merge_ok(struct request *, struct bio *);
 extern struct elevator_queue *elevator_alloc(struct request_queue *,
 					struct elevator_type *);