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Date:   Fri, 24 Apr 2020 12:42:38 +0200
From:   Christoph Hellwig <hch@lst.de>
To:     Ming Lei <ming.lei@redhat.com>
Cc:     Jens Axboe <axboe@kernel.dk>, linux-block@vger.kernel.org,
        John Garry <john.garry@huawei.com>,
        Bart Van Assche <bvanassche@acm.org>,
        Hannes Reinecke <hare@suse.com>,
        Christoph Hellwig <hch@lst.de>,
        Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH V8 09/11] blk-mq: add blk_mq_hctx_handle_dead_cpu for
 handling cpu dead
Message-ID: <20200424104238.GF28156@lst.de>
References: <20200424102351.475641-1-ming.lei@redhat.com> <20200424102351.475641-10-ming.lei@redhat.com>
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> +static int blk_mq_hctx_notify_dead(unsigned int cpu, struct hlist_node *node)
> +{
> +	struct blk_mq_hw_ctx *hctx = hlist_entry_safe(node,
> +			struct blk_mq_hw_ctx, cpuhp_dead);
> +
> +	if (!cpumask_test_cpu(cpu, hctx->cpumask))
> +		return 0;
> +
> +	blk_mq_hctx_handle_dead_cpu(hctx, cpu);
>  	return 0;

As commented last time:

why not simply:

	if (cpumask_test_cpu(cpu, hctx->cpumask))
		blk_mq_hctx_handle_dead_cpu(hctx, cpu);
	return 0;

?