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Date: Tue, 3 Oct 2017 02:19:22 -0700
From: Christoph Hellwig <hch@infradead.org>
To: Ming Lei <ming.lei@redhat.com>
Cc: Jens Axboe <axboe@fb.com>, linux-block@vger.kernel.org,
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        Omar Sandoval <osandov@fb.com>
Subject: Re: [PATCH V5 6/8] block: introduce .last_merge and .hash to
 blk_mq_ctx
Message-ID: <20171003091922.GD2771@infradead.org>
References: <20170930112655.31451-1-ming.lei@redhat.com>
 <20170930112655.31451-7-ming.lei@redhat.com>
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> +enum elv_merge elv_merge_ctx(struct request_queue *q, struct request **req,
> +		struct bio *bio, struct blk_mq_ctx *ctx)
> +{
> +	WARN_ON_ONCE(!q->mq_ops);
> +	return __elv_merge(q, req, bio, ctx->hash, ctx->last_merge);
> +}

This function only has a single caller, just open code it.