linux-kernel - Re: [PATCH 4/4] blk-mq: improve readability of blk_mq_alloc

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Message-ID: <20221101173727.GC20690@lst.de>
Date:   Tue, 1 Nov 2022 18:37:27 +0100
From:   Christoph Hellwig <hch@....de>
To:     Jinlong Chen <nickyc975@....edu.cn>
Cc:     axboe@...nel.dk, hch@....de, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] blk-mq: improve readability of
 blk_mq_alloc_request()

On Tue, Nov 01, 2022 at 11:11:37PM +0800, Jinlong Chen wrote:
> Add a helper blk_mq_alloc_request_nocache() to alloc request without
> cache. This makes blk_mq_alloc_request() more readable.
> 
> Signed-off-by: Jinlong Chen <nickyc975@....edu.cn>
> ---
>  block/blk-mq.c | 47 +++++++++++++++++++++++++++++------------------
>  1 file changed, 29 insertions(+), 18 deletions(-)
> 
> diff --git a/block/blk-mq.c b/block/blk-mq.c
> index 87a6348a0d0a..2fae111a42c8 100644
> --- a/block/blk-mq.c
> +++ b/block/blk-mq.c
> @@ -572,36 +572,47 @@ static struct request *blk_mq_alloc_cached_request(struct request_queue *q,
>  	return rq;
>  }
>  
> +static struct request *blk_mq_alloc_request_nocache(struct request_queue *q,
> +		blk_opf_t opf, blk_mq_req_flags_t flags)

The name is a bit odd, but I can't think off a better one.

> +	struct blk_mq_alloc_data data = {
>  			.q		= q,
>  			.flags		= flags,
>  			.cmd_flags	= opf,
>  			.nr_tags	= 1,
>  		};

And this now has superflous indenation.  Overall, while the separate
helper looks marginally nicer, I'm not really sure it is worth the
churn.