linux-kernel - Re: [PATCH 3/3] blk-mq: Use llist_head for blk_cpu

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Date:   Mon, 25 Jan 2021 08:30:12 +0000
From:   Christoph Hellwig <hch@...radead.org>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jens Axboe <axboe@...nel.dk>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH 3/3] blk-mq: Use llist_head for blk_cpu_done

> +static void blk_mq_complete_send_ipi(struct request *rq)
> +{
> +	struct llist_head *list;
> +	unsigned int cpu;
> +
> +	cpu = rq->mq_ctx->cpu;
> +	list = &per_cpu(blk_cpu_done, cpu);
> +	if (llist_add(&rq->ipi_list, list)) {
> +		INIT_CSD(&rq->csd, __blk_mq_complete_request_remote, rq);
> +		smp_call_function_single_async(cpu, &rq->csd);
> +	}
> +}

Nit: it would be nice to initialize cpu and list in the declaration
lines.

Otherwise looks good:

Reviewed-by: Christoph Hellwig <hch@....de>