linux-kernel - Re: [PATCH] regmap: silence GCC warning

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Message-ID: <20121001113927.GJ4360@opensource.wolfsonmicro.com>
Date:	Mon, 1 Oct 2012 12:39:27 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Paul Bolle <pebolle@...cali.nl>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] regmap: silence GCC warning

On Mon, Oct 01, 2012 at 12:32:57PM +0200, Paul Bolle wrote:
> On Mon, 2012-10-01 at 11:19 +0100, Mark Brown wrote:

> > I haven't actually stared hard enough at the code to figure this out
> > yet but given what you're changing I'd hope it's a flow analysis bug.
> > I'm certainly not seeing a warning here.

> Well, you may be using another version of gcc, or using different
> defaults. I'm using gcc-4.7.2-2.fc17.x86_64 (ie, the gcc currently
> shipped in Fedora 17 for x86_64), in what I think to be default
> settings.

Yes, of course.  Hence my comment about their flow analysis getting
worse and worse.

> Note that it's not some local oddity. Looking at the (currently) latest
> log for a Fedora build of v3.6-rc7 you'll find an identical warning [0].
> Apparently that build was done with gcc-4.7.1-5.fc18.x86_64 [1].

I assume this is a regression they've introduced in 4.7.
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