linux-kernel - Re: [PATCH 1/8] blk-mq: move hctx lock/unlock into a helper

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Date:   Mon, 8 Jan 2018 19:24:03 +0000
From:   Bart Van Assche <Bart.VanAssche@....com>
To:     "jbacik@...com" <jbacik@...com>, "tj@...nel.org" <tj@...nel.org>,
        "jack@...e.cz" <jack@...e.cz>, "clm@...com" <clm@...com>,
        "axboe@...nel.dk" <axboe@...nel.dk>
CC:     "kernel-team@...com" <kernel-team@...com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "linux-btrfs@...r.kernel.org" <linux-btrfs@...r.kernel.org>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "jianchao.w.wang@...cle.com" <jianchao.w.wang@...cle.com>
Subject: Re: [PATCH 1/8] blk-mq: move hctx lock/unlock into a helper

On Mon, 2018-01-08 at 11:15 -0800, Tejun Heo wrote:
> +static void hctx_unlock(struct blk_mq_hw_ctx *hctx, int srcu_idx)
> +{
> +	if (!(hctx->flags & BLK_MQ_F_BLOCKING))
> +		rcu_read_unlock();
> +	else
> +		srcu_read_unlock(hctx->queue_rq_srcu, srcu_idx);
> +}
> +
> +static void hctx_lock(struct blk_mq_hw_ctx *hctx, int *srcu_idx)
> +{
> +	if (!(hctx->flags & BLK_MQ_F_BLOCKING))
> +		rcu_read_lock();
> +	else
> +		*srcu_idx = srcu_read_lock(hctx->queue_rq_srcu);
> +}

A minor comment: please consider to reorder these two functions such that the
lock function appears first and the unlock function second. Anyway:

Reviewed-by: Bart Van Assche <bart.vanassche@....com>