linux-kernel - Re: [PATCH v2 2/3] block: Add a new helper to attempt to merge a bio

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Date:   Thu, 27 Aug 2020 22:30:41 +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 v2 2/3] block: Add a new helper to attempt to merge a bio

On Thu, Aug 27, 2020 at 11:44:15AM +0200, Christoph Hellwig wrote:
> On Tue, Aug 18, 2020 at 01:45:29PM +0800, Baolin Wang wrote:
> > Meanwhile move the blk_mq_bio_list_merge() into blk-merge.c and
> > rename it as a generic name.
> 
> That should probably a separate patch.

Sure.

> 
> > +		if (blk_attempt_bio_merge(q, rq, bio, nr_segs, false) == BIO_MERGE_OK)
> > +			return true;
> 
> This adds an overly long line.

The checkpatch.pl has increased the default limit to 100 characters, so
I did not get a long line warning. Anyway I will change a new line if
you concern about this.

> > -		if (merged)
> > +		switch (blk_attempt_bio_merge(q, rq, bio, nr_segs, true)) {
> > +		default:
> > +		case BIO_MERGE_NONE:
> > +			continue;
> > +		case BIO_MERGE_OK:
> >  			return true;
> > +		case BIO_MERGE_FAILED:
> > +			return false;
> > +		}
> 
> I don't think we need a default statement here as we handle all
> possible values of the enum.

OK. Will remove it in next version. Thanks.