linux-kernel - [PATCH 4/7] blk-mq: remove unnecessary bit clear in __blk_mq_alloc_requests

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Date:   Fri, 10 Feb 2023 04:11:13 +0800
From:   Kemeng Shi <shikemeng@...weicloud.com>
To:     axboe@...nel.dk, hch@....de, jack@...e.cz
Cc:     andriy.shevchenko@...ux.intel.com, qiulaibin@...wei.com,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 4/7] blk-mq: remove unnecessary bit clear in __blk_mq_alloc_requests_batch

Bits in tag_mask will not be accessed after it's cleared. So we can remove
this unnecessary clear.

Signed-off-by: Kemeng Shi <shikemeng@...weicloud.com>
---
 block/blk-mq.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/block/blk-mq.c b/block/blk-mq.c
index 89b4dd81ae17..6014d9b5e296 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -456,7 +456,6 @@ __blk_mq_alloc_requests_batch(struct blk_mq_alloc_data *data,
 			continue;
 		tag = tag_offset + i;
 		prefetch(tags->static_rqs[tag]);
-		tag_mask &= ~(1UL << i);
 		rq = blk_mq_rq_ctx_init(data, tags, tag, alloc_time_ns);
 		rq_list_add(data->cached_rq, rq);
 		nr++;
-- 
2.30.0