linux-kernel - Re: [PATCH V5 5/8] block: add check on elevator for supporting bio merge via hashtable from blk-mq sw queue

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Message-ID: <20171003091746.GC2771@infradead.org>
Date:   Tue, 3 Oct 2017 02:17:46 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Ming Lei <ming.lei@...hat.com>
Cc:     Jens Axboe <axboe@...com>, linux-block@...r.kernel.org,
        Christoph Hellwig <hch@...radead.org>,
        Mike Snitzer <snitzer@...hat.com>, dm-devel@...hat.com,
        Bart Van Assche <bart.vanassche@...disk.com>,
        Laurence Oberman <loberman@...hat.com>,
        Paolo Valente <paolo.valente@...aro.org>,
        Oleksandr Natalenko <oleksandr@...alenko.name>,
        Tom Nguyen <tom81094@...il.com>, linux-kernel@...r.kernel.org,
        Omar Sandoval <osandov@...com>
Subject: Re: [PATCH V5 5/8] block: add check on elevator for supporting bio
 merge via hashtable from blk-mq sw queue

On Sat, Sep 30, 2017 at 07:26:52PM +0800, Ming Lei wrote:
> blk_mq_sched_try_merge() will be reused in following patches
> to support bio merge to blk-mq sw queue, so add checkes to
> related functions which are called from blk_mq_sched_try_merge().

The changes themselves look ok, but don't make sense on their own,
I think this needs to be merged with the code tor actually introduce
the bio merge.