linux-kernel - Re: [PATCH v2 2/5] mq-deadline: switch to use elevator lock

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Message-ID: <ca605746-da46-46a4-a0f3-460ed2d35b0b@acm.org>
Date: Wed, 30 Jul 2025 10:21:16 -0700
From: Bart Van Assche <bvanassche@....org>
To: Yu Kuai <yukuai1@...weicloud.com>, dlemoal@...nel.org, hare@...e.de,
 jack@...e.cz, tj@...nel.org, josef@...icpanda.com, axboe@...nel.dk,
 yukuai3@...wei.com
Cc: cgroups@...r.kernel.org, linux-block@...r.kernel.org,
 linux-kernel@...r.kernel.org, yi.zhang@...wei.com, yangerkun@...wei.com,
 johnny.chenyi@...wei.com
Subject: Re: [PATCH v2 2/5] mq-deadline: switch to use elevator lock

On 7/30/25 1:22 AM, Yu Kuai wrote:
> @@ -466,10 +466,9 @@ static struct request *dd_dispatch_request(struct blk_mq_hw_ctx *hctx)
>   	struct request *rq;
>   	enum dd_prio prio;
>   
> -	spin_lock(&dd->lock);
>   	rq = dd_dispatch_prio_aged_requests(dd, now);

The description says "no functional changes" but I think I see a 
functional change above. Please restrict this patch to changing
&dd->lock into dd->lock only.

Thanks,

Bart.