linux-kernel - Re: [PATCH v2 4/4] lockdep: Assign a lock_class per gendisk used for wait_for

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Message-ID: <20171023070433.GJ3310@X58A-UD3R>
Date:   Mon, 23 Oct 2017 16:04:33 +0900
From:   Byungchul Park <byungchul.park@....com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     peterz@...radead.org, mingo@...nel.org, tglx@...utronix.de,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org, tj@...nel.org,
        johannes.berg@...el.com, oleg@...hat.com, amir73il@...il.com,
        david@...morbit.com, darrick.wong@...cle.com,
        linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-block@...r.kernel.org, idryomov@...il.com,
        kernel-team@....com
Subject: Re: [PATCH v2 4/4] lockdep: Assign a lock_class per gendisk used for
 wait_for_completion()

On Sun, Oct 22, 2017 at 11:36:30PM -0700, Christoph Hellwig wrote:
> On Mon, Oct 23, 2017 at 08:53:35AM +0900, Byungchul Park wrote:
> > On Fri, Oct 20, 2017 at 07:44:51AM -0700, Christoph Hellwig wrote:
> > > The Subject prefix for this should be "block:".
> > > 
> > > > @@ -945,7 +945,7 @@ int submit_bio_wait(struct bio *bio)
> > > >  {
> > > >  	struct submit_bio_ret ret;
> > > >  
> > > > -	init_completion(&ret.event);
> > > > +	init_completion_with_map(&ret.event, &bio->bi_disk->lockdep_map);
> > > 
> > > FYI, I have an outstanding patch to simplify this a lot, which
> > > switches this to DECLARE_COMPLETION_ONSTACK.  I can delay this or let
> > > you pick it up with your series, but we'll need a variant of
> > > DECLARE_COMPLETION_ONSTACK with the lockdep annotations.
> > 
> > Hello,
> > 
> > I'm sorry for late.
> > 
> > I think your patch makes block code simpler and better. I like it.
> > 
> > But, I just wonder if it's related to my series.
> 
> Because it shows that we also need a version of DECLARE_COMPLETION_ONSTACK
> the gets passed an explicit lockdep map.  And because if it was merged
> through a different tree it would create a conflict.
> 
> > Is it proper to add
> > your patch into my series?
> 
> Sure.

I will add yours at the next spin.

Thank you.

BTW, to all...

Any additional opinions about these patches?