linux-kernel - Re: [PATCH v5 9/9] block: Assign a lock_class per gendisk used for wait_for

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Date:   Thu, 26 Oct 2017 14:58:50 +0900
From:   Byungchul Park <byungchul.park@....com>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Jens Axboe <axboe@...nel.dk>, peterz@...radead.org,
        johan@...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,
        hch@...radead.org, idryomov@...il.com, kernel-team@....com
Subject: Re: [PATCH v5 9/9] block: Assign a lock_class per gendisk used for
 wait_for_completion()

On Thu, Oct 26, 2017 at 07:50:46AM +0200, Ingo Molnar wrote:
> 
> * Jens Axboe <axboe@...nel.dk> wrote:
> 
> > On 10/25/2017 03:13 AM, Ingo Molnar wrote:
> > > 
> > > * Byungchul Park <byungchul.park@....com> wrote:
> > > 
> > >> Darrick posted the following warning and Dave Chinner analyzed it:
> > >>
> > >>> ======================================================
> > >>> WARNING: possible circular locking dependency detected
> > >>> 4.14.0-rc1-fixes #1 Tainted: G        W
> > > 
> > >> Reported-by: Darrick J. Wong <darrick.wong@...cle.com>
> > >> Analyzed-by: Dave Chinner <david@...morbit.com>
> > >> Signed-off-by: Byungchul Park <byungchul.park@....com>
> > >> ---
> > >>  block/bio.c           |  2 +-
> > >>  block/genhd.c         | 10 ++--------
> > >>  include/linux/genhd.h | 22 ++++++++++++++++++++--
> > >>  3 files changed, 23 insertions(+), 11 deletions(-)
> > > 
> > > Ok, this patch looks good to me now, I'll wait to get an Ack or Nak from Jens for 
> > > these changes.
> > > 
> > > Jens: this patch has some dependencies in prior lockdep changes, so I'd like to 
> > > carry it in the locking tree for a v4.15 merge.
> > 
> > Looks fine to me, you can add my reviewed-by and carry it in your tree.
> 
> Thanks Jens!

Thanks all of you.