The barrier isn't necessary because both atomic_dec_and_test() and wake_up() implicate one barrier.
Signed-off-by: Ming Lei <[email protected]> --- block/blk-mq-tag.c | 1 - 1 file changed, 1 deletion(-) diff --git a/block/blk-mq-tag.c b/block/blk-mq-tag.c index b8b968d..777aad7 100644 --- a/block/blk-mq-tag.c +++ b/block/blk-mq-tag.c @@ -243,7 +243,6 @@ 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_WAIT_BATCH); bt_index_inc(&bt->wake_index); wake_up(&bs->wait); -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
