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| author | Ming Lei <tom.leiming@gmail.com> | 2014-05-11 01:01:49 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2014-05-10 15:42:13 -0600 |
| commit | 60f2df8a29df5f2db2c87fd23122a1cebdf2011a (patch) | |
| tree | 29357144d3693b6569e6d525873c31c273c9cc56 /block | |
| parent | 0289b2e110b7824b2f76d194ad6f8f0844e270ad (diff) | |
| download | lwn-60f2df8a29df5f2db2c87fd23122a1cebdf2011a.tar.gz lwn-60f2df8a29df5f2db2c87fd23122a1cebdf2011a.zip | |
blk-mq: bitmap tag: remove barrier in bt_clear_tag()
The barrier isn't necessary because both atomic_dec_and_test()
and wake_up() implicate one barrier.
Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-mq-tag.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/block/blk-mq-tag.c b/block/blk-mq-tag.c index a81b138e89fe..5a83d8e587f7 100644 --- a/block/blk-mq-tag.c +++ b/block/blk-mq-tag.c @@ -244,7 +244,6 @@ static void bt_clear_tag(struct blk_mq_bitmap_tags *bt, unsigned int tag) bs = bt_wake_ptr(bt); if (bs && atomic_dec_and_test(&bs->wait_cnt)) { - smp_mb__after_clear_bit(); atomic_set(&bs->wait_cnt, bt->wake_cnt); bt_index_inc(&bt->wake_index); wake_up(&bs->wait); |