linux-kernel - Re: [PATCH]Silancing a false positive: "may be used uninitialized"

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Message-ID: <20091220211433.GA6025@verge.net.au>
Date:	Mon, 21 Dec 2009 08:14:36 +1100
From:	Simon Horman <horms@...ge.net.au>
To:	Marin Mitov <mitov@...p.bas.bg>
Cc:	David Airlie <airlied@...ux.ie>,
	Jesse Barnes <jesse.barnes@...el.com>,
	dri-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH]Silancing a false positive: "may be used uninitialized"

On Sun, Dec 20, 2009 at 12:43:19PM +0200, Marin Mitov wrote:
> On Sunday 20 December 2009 11:56:44 am Simon Horman wrote:
> > On Sun, Dec 20, 2009 at 09:03:27AM +0200, Marin Mitov wrote:
> > > Hello all,
> > > 
> > > Silancing a false positive:
> > > warning: 'width' may be used uninitialized in this function
> > > drivers/gpu/drm/drm_edid.c
> > 
> > Is it guaranteed that the switch will always see a value covered by the
> > four cases it has? 
> 
> Yes it is. The value is masked (& 0xc0) so all the possible values are
> (0x00, 0x40, 0x80, 0xc0) covered by the switch. That's why it is false positive.

Of course, silly me.

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