linux-kernel - Re: [PATCH v6 1/4] block: add blk_mq_is_queue

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Date:   Tue, 9 Mar 2021 17:19:31 +0000
From:   Christoph Hellwig <hch@...radead.org>
To:     Sergei Shtepa <sergei.shtepa@...am.com>
Cc:     snitzer@...hat.com, agk@...hat.com, hare@...e.de, song@...nel.org,
        axboe@...nel.dk, dm-devel@...hat.com, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org,
        linux-api@...r.kernel.org, pavel.tide@...am.com
Subject: Re: [PATCH v6 1/4] block: add blk_mq_is_queue_frozen()

On Wed, Mar 03, 2021 at 03:30:15PM +0300, Sergei Shtepa wrote:
> +bool blk_mq_is_queue_frozen(struct request_queue *q)
> +{
> +	bool ret;
> +
> +	mutex_lock(&q->mq_freeze_lock);
> +	ret = percpu_ref_is_dying(&q->q_usage_counter) && percpu_ref_is_zero(&q->q_usage_counter);

Please avoid the overly long line.

Also maybe frozen is a better name for the variable currently called
ret?