linux-kernel - Re: linux-next: build warning after merge of Linus' tree

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Message-ID: <e96cf8a57c4633e807cfe82762397ad15ba19ed8.camel@sipsolutions.net>
Date:   Mon, 29 Jul 2019 09:03:14 +0200
From:   Johannes Berg <johannes@...solutions.net>
To:     Takashi Iwai <tiwai@...e.de>,
        Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: linux-next: build warning after merge of Linus' tree

On Mon, 2019-07-29 at 08:58 +0200, Takashi Iwai wrote:
> On Mon, 29 Jul 2019 06:04:04 +0200,
> Stephen Rothwell wrote:
> > Hi all,
> > 
> > After merging the origin tree, today's linux-next build (powerpc
> > allyesconfig) produced this warning:
> > 
> > sound/aoa/codecs/onyx.c: In function 'onyx_snd_single_bit_get':
> > sound/aoa/codecs/onyx.c:377:37: warning: 'c' may be used uninitialized in this function [-Wmaybe-uninitialized]
> >   ucontrol->value.integer.value[0] = !!(c & mask) ^ polarity;
> >                                      ^~~~~~~~~~~~
> > 
> > Introduced by commit
> > 
> >   f3d9478b2ce4 ("[ALSA] snd-aoa: add snd-aoa")
> > 
> > This warning has been around for a long time.  It could possibly be
> > suppressed by checking for errors returned by onyx_read_register().
> 
> Yes, or simply zero-ing the variable in onyx_read_register().  The
> current code ignores the read error and it's been OK over a decade :)

Yeah, it's pretty weird that it never showed up before. I was wondering
for a minute why I was CC'ed on a sound merge issue :-)

Do you want me to send a patch or just commit something to suppress
this?

johannes