linux-kernel - Re: [PATCH] fs/ocfs2/dlmglue: lockdep

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Date:   Tue, 9 Oct 2018 15:40:16 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Anders Roxell <anders.roxell@...aro.org>, geert@...ux-m68k.org,
        Mark Fasheh <mark@...heh.com>,
        Joel Becker <jlbec@...lplan.org>, ocfs2-devel@....oracle.com,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] fs/ocfs2/dlmglue: lockdep_keys defined but not used

On Tue, 9 Oct 2018 20:22:17 +0200 Borislav Petkov <bp@...en8.de> wrote:

> On Fri, Aug 24, 2018 at 03:07:03PM +0200, Anders Roxell wrote:
> > On Thu, 23 Aug 2018 at 23:07, Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> > >
> > > Hi Anders,
> > >
> > > On Wed, Jul 4, 2018 at 11:54 AM Anders Roxell <anders.roxell@...aro.org> wrote:
> > > > When CONFIG_DEBUG_LOCK_ALLOC isn't enabled lockdep_keys isn't used and
> > > > we get a warning:
> > > > fs/ocfs2/dlmglue.c:99:30: warning: ‘lockdep_keys’ defined but not used
> > > >     [-Wunused-variable]
> > > >  static struct lock_class_key lockdep_keys[OCFS2_NUM_LOCK_TYPES];
> > > >                               ^~~~~~~~~~~~
> > > > Adding __maybe_unused to the declaration hids the warning.
> > >
> > > Thanks for your patcj!
> > >
> > > > Fixes: 1cd75cdb8fbb ("ocfs2: make several functions and variables static (and some const)")
> > >
> > > Fixes: 480bd56485b77c36 ("ocfs2: make several functions and variables
> > > static (and some const)")
> > 
> > Thanks, thats correct.
> > 
> > >
> > > Presumably the branch got rebased?
> > 
> > probably.
> > 
> > Mark, Joel, do you want me to send a new patch where I correct the sha
> > in the "Fixes" part of the changelog or can you fix that?
> 
> FWIW, I'm still seeing this in randconfig builds here.
> 
> Adding akpm in case no one picks this up.
> 

https://ozlabs.org/~akpm/mmots/broken-out/ocfs2-fix-a-gcc-compiled-warning.patch
is queued for 4.20-rc1.  I'll see if we can squeeze it into 4.19.