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writeback: remove smp_mb(), it's not needed with list_add_tail_rcu()

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list_add_tail_rcu contains required barriers.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Nick Piggin 2009-09-15 21:32:58 +02:00 committed by Jens Axboe
parent 49db041430
commit deed62edff
1 changed files with 3 additions and 3 deletions
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6
fs/fs-writeback.c
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@ -151,10 +151,10 @@ static void bdi_queue_work(struct backing_dev_info *bdi, struct bdi_work *work)
BUG_ON(!bdi->wb_cnt); BUG_ON(!bdi->wb_cnt);
/* /*
* Make sure stores are seen before it appears on the list * list_add_tail_rcu() contains the necessary barriers to
* make sure the above stores are seen before the item is
* noticed on the list
*/ */
smp_mb();
spin_lock(&bdi->wb_lock); spin_lock(&bdi->wb_lock);
list_add_tail_rcu(&work->list, &bdi->work_list); list_add_tail_rcu(&work->list, &bdi->work_list);
spin_unlock(&bdi->wb_lock); spin_unlock(&bdi->wb_lock);