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blk-throttle: fix unused variable warning with BLK_DEV_THROTTLING_LOW=n

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We trigger this warning:

block/blk-throttle.c: In function ‘blk_throtl_bio’:
block/blk-throttle.c:2042:6: warning: variable ‘ret’ set but not used [-Wunused-but-set-variable]
  int ret;
      ^~~

since we only assign 'ret' if BLK_DEV_THROTTLING_LOW is off, we never
check it.

Reported-by: Bart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: Bart Van Assche <bart.vanassche@sandisk.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Jens Axboe 2017-04-20 09:41:36 -06:00
parent 659b3394eb
commit 2bc19cd5fd
1 changed files with 15 additions and 7 deletions
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22
block/blk-throttle.c
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@ -2030,6 +2030,20 @@ static inline void throtl_update_latency_buckets(struct throtl_data *td)
}
#endif
static void blk_throtl_assoc_bio(struct throtl_grp *tg, struct bio *bio)
{
#ifdef CONFIG_BLK_DEV_THROTTLING_LOW
int ret;
ret = bio_associate_current(bio);
if (ret == 0 || ret == -EBUSY)
bio->bi_cg_private = tg;
blk_stat_set_issue(&bio->bi_issue_stat, bio_sectors(bio));
#else
bio_associate_current(bio);
#endif
}
bool blk_throtl_bio(struct request_queue *q, struct blkcg_gq *blkg,
struct bio *bio)
{
@ -2039,7 +2053,6 @@ bool blk_throtl_bio(struct request_queue *q, struct blkcg_gq *blkg,
bool rw = bio_data_dir(bio);
bool throttled = false;
struct throtl_data *td = tg->td;
int ret;
WARN_ON_ONCE(!rcu_read_lock_held());
@ -2054,12 +2067,7 @@ bool blk_throtl_bio(struct request_queue *q, struct blkcg_gq *blkg,
if (unlikely(blk_queue_bypass(q)))
goto out_unlock;
ret = bio_associate_current(bio);
#ifdef CONFIG_BLK_DEV_THROTTLING_LOW
if (ret == 0 || ret == -EBUSY)
bio->bi_cg_private = tg;
blk_stat_set_issue(&bio->bi_issue_stat, bio_sectors(bio));
#endif
blk_throtl_assoc_bio(tg, bio);
blk_throtl_update_idletime(tg);
sq = &tg->service_queue;