linux-kernel - Re: [PATCH RESEND 5/5] block: Remove __blk_mq_sched_bio

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Date:   Tue, 18 Aug 2020 11:29:37 +0800
From:   Baolin Wang <baolin.wang@...ux.alibaba.com>
To:     Christoph Hellwig <hch@....de>
Cc:     axboe@...nel.dk, ming.lei@...hat.com, baolin.wang7@...il.com,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND 5/5] block: Remove __blk_mq_sched_bio_merge()
 helper

On Mon, Aug 17, 2020 at 02:26:08PM +0200, Christoph Hellwig wrote:
> On Mon, Aug 17, 2020 at 08:14:08PM +0800, Baolin Wang wrote:
> > On Mon, Aug 17, 2020 at 08:32:41AM +0200, Christoph Hellwig wrote:
> > > On Mon, Aug 17, 2020 at 12:09:19PM +0800, Baolin Wang wrote:
> > > > The blk_mq_sched_bio_merge() just wrap the __blk_mq_sched_bio_merge(), and
> > > > no other places will use __blk_mq_sched_bio_merge(). Thus we can combine
> > > > these 2 similar functions into one function.
> > > 
> > > I think the idea was to avoid the function call for the nomerges fast
> > > path.  Not sure if that is really worth it.
> > 
> > Um, no places will use __blk_mq_sched_bio_merge(), not sure if it is a
> > good choice we still keep an unused and similar function?
> 
> Well, blk_mq_sched_bio_merge calls __blk_mq_sched_bio_merge, after
> performing two fast path checks.

What I mean is blk_mq_sched_bio_merge() just wrap the
__blk_mq_sched_bio_merge(), and no other users will call
__blk_mq_sched_bio_merge(). Anyway, I will drop this patch
as you suggested.