linux-kernel - Re: [PATCH 05/06] Fix compilation warning for arch/x86/kernel/apm

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Date:	Tue, 21 Jul 2009 08:03:55 +0530
From:	Subrata Modak <subrata@...ux.vnet.ibm.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-laptop@...r.kernel.org,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Sachin P Sant <sachinp@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...hat.com>,
	David Howells <dhowells@...hat.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 05/06] Fix compilation warning for
	arch/x86/kernel/apm_32.c

On Sat, 2009-07-18 at 16:13 +0200, Ingo Molnar wrote:
> * Subrata Modak <subrata@...ux.vnet.ibm.com> wrote:
> 
> > Following fix is inspired by David Howells fix few days back:
> > http://lkml.org/lkml/2009/7/9/109,
> > 
> > Signed-off-by: Subrata Modak<subrata@...ux.vnet.ibm.com>,
> > ---
> > 
> > --- a/arch/x86/kernel/apm_32.c	2009-06-15 07:50:51.000000000 +0530
> > +++ b/arch/x86/kernel/apm_32.c	2009-07-15 06:43:59.000000000 +0530
> > @@ -811,7 +811,7 @@ static int apm_do_idle(void)
> >  	u8 ret = 0;
> >  	int idled = 0;
> >  	int polling;
> > -	int err;
> > +	int uninitialized_var(err);
> 
> Please dont use uninitialized_var() as it's dangerous - in something 
> as performance-uncritical as this we should initialize it to 0 and 
> mention it in the changelog that this works around a GCC false 
> positive warning.

Sure. Resending as you suggested.

Regards--
Subrata

> 
> Thanks,
> 
> 	Ingo

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