[PATCH] block: change return type to bool from int

[Chengguang Xu <cgxu519@xxxxxxx>]

Change some functions' return type to bool from int
because their checking results could represnt in bool
value.

Signed-off-by: Chengguang Xu <cgxu519@xxxxxxx>
---
 block/cfq-iosched.c      | 4 ++--
 block/elevator.c         | 2 +-
 include/linux/elevator.h | 4 ++--
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index ed41aa978c4a..b58969b8b6ea 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -2582,7 +2582,7 @@ cfq_merged_requests(struct request_queue *q, struct request *rq,
 		cfq_del_cfqq_rr(cfqd, cfqq);
 }
 
-static int cfq_allow_bio_merge(struct request_queue *q, struct request *rq,
+static bool cfq_allow_bio_merge(struct request_queue *q, struct request *rq,
 			       struct bio *bio)
 {
 	struct cfq_data *cfqd = q->elevator->elevator_data;
@@ -2608,7 +2608,7 @@ static int cfq_allow_bio_merge(struct request_queue *q, struct request *rq,
 	return cfqq == RQ_CFQQ(rq);
 }
 
-static int cfq_allow_rq_merge(struct request_queue *q, struct request *rq,
+static bool cfq_allow_rq_merge(struct request_queue *q, struct request *rq,
 			      struct request *next)
 {
 	return RQ_CFQQ(rq) == RQ_CFQQ(next);
diff --git a/block/elevator.c b/block/elevator.c
index 8fdcd64ae12e..432717fc782f 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -56,7 +56,7 @@ static LIST_HEAD(elv_list);
  * Query io scheduler to see if the current process issuing bio may be
  * merged with rq.
  */
-static int elv_iosched_allow_bio_merge(struct request *rq, struct bio *bio)
+static bool elv_iosched_allow_bio_merge(struct request *rq, struct bio *bio)
 {
 	struct request_queue *q = rq->q;
 	struct elevator_queue *e = q->elevator;
diff --git a/include/linux/elevator.h b/include/linux/elevator.h
index 015bb59c0331..f6928aa5cc3d 100644
--- a/include/linux/elevator.h
+++ b/include/linux/elevator.h
@@ -30,10 +30,10 @@ typedef void (elevator_merge_req_fn) (struct request_queue *, struct request *,
 
 typedef void (elevator_merged_fn) (struct request_queue *, struct request *, enum elv_merge);
 
-typedef int (elevator_allow_bio_merge_fn) (struct request_queue *,
+typedef bool (elevator_allow_bio_merge_fn) (struct request_queue *,
 					   struct request *, struct bio *);
 
-typedef int (elevator_allow_rq_merge_fn) (struct request_queue *,
+typedef bool (elevator_allow_rq_merge_fn) (struct request_queue *,
 					  struct request *, struct request *);
 
 typedef void (elevator_bio_merged_fn) (struct request_queue *,
-- 
2.19.2