From: huhai <huhai@kylinos.cn>
Date: Tue, 22 May 2018 17:39:34 +0800
Subject: [PATCH] blk-mq: remove wrong 'unlikely' check
Git-commit: b4f6f38d9f85b6209ddaf81886b687da150dfd7b
Patch-mainline: v4.18-rc1
References: bsc#1104967,FATE#325924
When dispatch_rq_from_ctx is called, in the vast majority of cases
the ctx->rq_list is not empty.
Signed-off-by: huhai <huhai@kylinos.cn>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Acked-by: Hannes Reinecke <hare@suse.com>
---
block/blk-mq.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 4cbfd784e837..df928200b17e 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -1036,7 +1036,7 @@ static bool dispatch_rq_from_ctx(struct sbitmap *sb, unsigned int bitnr,
struct blk_mq_ctx *ctx = hctx->ctxs[bitnr];
spin_lock(&ctx->lock);
- if (unlikely(!list_empty(&ctx->rq_list))) {
+ if (!list_empty(&ctx->rq_list)) {
dispatch_data->rq = list_entry_rq(ctx->rq_list.next);
list_del_init(&dispatch_data->rq->queuelist);
if (list_empty(&ctx->rq_list))
--
2.16.4