block: move update_io_ticks to blk-core.c

All callers are in blk-core.c, so move update_io_ticks over.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

block/bio.c

@@ -1376,22 +1376,6 @@ void bio_check_pages_dirty(struct bio *bio)
 	schedule_work(&bio_dirty_work);
 }
 
-void update_io_ticks(struct hd_struct *part, unsigned long now, bool end)
-{
-	unsigned long stamp;
-again:
-	stamp = READ_ONCE(part->stamp);
-	if (unlikely(stamp != now)) {
-		if (likely(cmpxchg(&part->stamp, stamp, now) == stamp)) {
-			__part_stat_add(part, io_ticks, end ? now - stamp : 1);
-		}
-	}
-	if (part->partno) {
-		part = &part_to_disk(part)->part0;
-		goto again;
-	}
-}
-
 static inline bool bio_remaining_done(struct bio *bio)
 {
 	/*

block/blk-core.c

@@ -1381,6 +1381,21 @@ unsigned int blk_rq_err_bytes(const struct request *rq)
 }
 EXPORT_SYMBOL_GPL(blk_rq_err_bytes);
 
+static void update_io_ticks(struct hd_struct *part, unsigned long now, bool end)
+{
+	unsigned long stamp;
+again:
+	stamp = READ_ONCE(part->stamp);
+	if (unlikely(stamp != now)) {
+		if (likely(cmpxchg(&part->stamp, stamp, now) == stamp))
+			__part_stat_add(part, io_ticks, end ? now - stamp : 1);
+	}
+	if (part->partno) {
+		part = &part_to_disk(part)->part0;
+		goto again;
+	}
+}
+
 static void blk_account_io_completion(struct request *req, unsigned int bytes)
 {
 	if (req->part && blk_do_io_stat(req)) {

block/blk.h

@@ -344,7 +344,6 @@ void blk_queue_free_zone_bitmaps(struct request_queue *q);
 static inline void blk_queue_free_zone_bitmaps(struct request_queue *q) {}
 #endif
 
-void update_io_ticks(struct hd_struct *part, unsigned long now, bool end);
 struct hd_struct *disk_map_sector_rcu(struct gendisk *disk, sector_t sector);
 
 int blk_alloc_devt(struct hd_struct *part, dev_t *devt);