From: Nick Piggin Date: Tue, 15 Sep 2009 19:32:58 +0000 (+0200) Subject: writeback: remove smp_mb(), it's not needed with list_add_tail_rcu() X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=deed62edffe600bc5b379c872d3004116e001b66;p=openwrt%2Fstaging%2Fblogic.git writeback: remove smp_mb(), it's not needed with list_add_tail_rcu() list_add_tail_rcu contains required barriers. Signed-off-by: Nick Piggin Signed-off-by: Jens Axboe --- diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c index 34757758511a..59c99e729187 100644 --- a/fs/fs-writeback.c +++ b/fs/fs-writeback.c @@ -151,10 +151,10 @@ static void bdi_queue_work(struct backing_dev_info *bdi, struct bdi_work *work) 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); list_add_tail_rcu(&work->list, &bdi->work_list); spin_unlock(&bdi->wb_lock);