linux-kernel - Re: [PATCH] autofs4 - fix false positive compile error

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Date:	Thu, 26 Jun 2014 10:28:55 +0800
From:	Ian Kent <raven@...maw.net>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	autofs mailing list <autofs@...r.kernel.org>,
	Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] autofs4 - fix false positive compile error

On Wed, 2014-06-25 at 13:06 -0700, Andrew Morton wrote:
> On Wed, 25 Jun 2014 20:49:39 +0800 Ian Kent <raven@...maw.net> wrote:
> 
> > On strict build environments we can see:
> > 
> > fs/autofs4/inode.c: In function 'autofs4_fill_super':
> > fs/autofs4/inode.c:312: error: 'pgrp' may be used uninitialized in this
> > function
> > make[2]: *** [fs/autofs4/inode.o] Error 1
> > make[1]: *** [fs/autofs4] Error 2
> > make: *** [fs] Error 2
> > make: *** Waiting for unfinished jobs....
> > 
> > This is due to the use of pgrp_set being used to indicate pgrp has
> > has been set rather than initializing pgrp itself.
> > 
> 
> Yes, that code seems to be explicitly designed to trigger a gcc warning ;)
> 
> What is a "strict build environment"?  Someone's using -Werror for the
> entire kernel?  That must make for a miserable life.

Yes, TBH I was a bit surprised myself.
It resulted from a RHEL-6.6 patch submission.

I didn't notice it and ended up missing an internal (RedHat) patch
submission deadline as my original interest in these was the result of
an upstream discussion and I stupidly relied on my upstream testing.

It might just be that our internal up and coming file system tree is
specifically more fussy but never the less I got caught out.

Ian

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