linux-kernel - Re: [PATCH] xfs: Use WARN_ON rather than BUG() for bailout mount-operation

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Message-ID: <20190828215118.GH1037350@magnolia>
Date:   Wed, 28 Aug 2019 14:51:18 -0700
From:   "Darrick J. Wong" <darrick.wong@...cle.com>
To:     Austin Kim <austindh.kim@...il.com>
Cc:     linux-xfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] xfs: Use WARN_ON rather than BUG() for bailout
 mount-operation

On Thu, Aug 29, 2019 at 06:30:43AM +0900, Austin Kim wrote:
> Dear Mr. Darrick J. Wong
> 
> Thanks for reviewing patch. BTW, I have a question for you.
> 
> Do I have to update the patch again with 'a space before the brace'?
> Or could I just wait for the patch to be imported?
> 
> It would be thankful if you give me a feedback.

I made the correction when I imported your patch into my testing tree,
so you don't need to resubmit the patch just to fix that one thing.

However, if you decide to send a new revision *for some other reason*,
then please make the correction in your own tree before resubmitting.

--D

> BR,
> Guillermo Austin Kim
> 
> 2019년 8월 29일 (목) 오전 12:14, Darrick J. Wong <darrick.wong@...cle.com>님이 작성:
> >
> > On Wed, Aug 28, 2019 at 03:47:49PM +0900, Austin Kim wrote:
> > > If the CONFIG_BUG is enabled, BUG() is executed and then system is crashed.
> > > However, the bailout for mount is no longer proceeding.
> > >
> > > For this reason, using WARN_ON rather than BUG() could prevent this situation.
> > > ---
> > >  fs/xfs/xfs_mount.c | 3 +--
> > >  1 file changed, 1 insertion(+), 2 deletions(-)
> > >
> > > diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
> > > index 322da69..10fe000 100644
> > > --- a/fs/xfs/xfs_mount.c
> > > +++ b/fs/xfs/xfs_mount.c
> > > @@ -213,8 +213,7 @@ xfs_initialize_perag(
> > >                       goto out_hash_destroy;
> > >
> > >               spin_lock(&mp->m_perag_lock);
> > > -             if (radix_tree_insert(&mp->m_perag_tree, index, pag)) {
> > > -                     BUG();
> > > +             if (WARN_ON(radix_tree_insert(&mp->m_perag_tree, index, pag))){
> >
> > Need a space before the brace.
> >
> > Will fix on import,
> > Reviewed-by: Darrick J. Wong <darrick.wong@...cle.com>
> >
> > --D
> >
> > >                       spin_unlock(&mp->m_perag_lock);
> > >                       radix_tree_preload_end();
> > >                       error = -EEXIST;
> > > --
> > > 2.6.2
> > >