[PATCH 6/6] blk-mq: Micro-optimize bt_get()
From: Bart Van Assche
Date: Tue Dec 09 2014 - 10:59:52 EST
Remove a superfluous finish_wait() call. Convert the two bt_wait_ptr()
calls into a single call.
Signed-off-by: Bart Van Assche <bvanassche@xxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Robert Elliott <elliott@xxxxxx>
Cc: Ming Lei <ming.lei@xxxxxxxxxxxxx>
Cc: Alexander Gordeev <agordeev@xxxxxxxxxx>
---
block/blk-mq-tag.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/block/blk-mq-tag.c b/block/blk-mq-tag.c
index 795996e..2373724 100644
--- a/block/blk-mq-tag.c
+++ b/block/blk-mq-tag.c
@@ -248,8 +248,8 @@ static int bt_get(struct blk_mq_alloc_data *data,
if (!(data->gfp & __GFP_WAIT))
return -1;
- bs = bt_wait_ptr(bt, hctx);
do {
+ bs = bt_wait_ptr(bt, hctx);
prepare_to_wait(&bs->wait, &wait, TASK_UNINTERRUPTIBLE);
tag = __bt_get(hctx, bt, last_tag);
@@ -276,8 +276,6 @@ static int bt_get(struct blk_mq_alloc_data *data,
hctx = data->hctx;
bt = &hctx->tags->bitmap_tags;
}
- finish_wait(&bs->wait, &wait);
- bs = bt_wait_ptr(bt, hctx);
} while (1);
finish_wait(&bs->wait, &wait);
--
2.1.2
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