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block: optimise blk_flush_plug_list 

Don't call flush_plug_callbacks if there are no plug callbacks.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
[hch: split from a larger patch]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20211020144119.142582-4-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2021-10-20 16:41:18 +02:00 committed by Jens Axboe
parent dbb6f764a0
commit b600455d84
1 changed files with 2 additions and 2 deletions
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4
block/blk-core.c
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@ -1639,8 +1639,8 @@ EXPORT_SYMBOL(blk_check_plugged);
void blk_flush_plug_list(struct blk_plug *plug, bool from_schedule)
{
flush_plug_callbacks(plug, from_schedule);
if (!list_empty(&plug->cb_list))
flush_plug_callbacks(plug, from_schedule);
if (!rq_list_empty(plug->mq_list))
blk_mq_flush_plug_list(plug, from_schedule);
if (unlikely(!from_schedule && plug->cached_rq))