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

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Date:	Mon, 01 Oct 2012 21:08:57 +0200
From:	Paul Bolle <pebolle@...cali.nl>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] regmap: silence GCC warning

On Mon, 2012-10-01 at 12:39 +0100, Mark Brown wrote:
> I assume this is a regression they've introduced in 4.7.

For what it's worth, GCC 4.6 apparently shows identical behavior.

The code that triggers this warning was (basically) introduced in commit
b8fb5ab156055b745254609f4635fcfd6b7dabc8 ("regmap: Support raw reads
from cached registers"). The first release shipping that commit was
v3.4. The log of a build of v3.4 using the oldest version of GCC (that
Fedora used to build v3.4) I could find also contains this warning [0].
They used gcc-4.6.3-2.fc16.x86_64 in that build [1].

Perhaps I'll stumble on some build logs of v3.4 for which earlier
versions of GCC were used. That might show whether or not earlier
releases of GCC also print a warning for this code.

Paul Bolle

[0] http://kojipkgs.fedoraproject.org/packages/kernel/3.4.2/1.fc16/data/logs/x86_64/build.log
[1] http://kojipkgs.fedoraproject.org/packages/kernel/3.4.2/1.fc16/data/logs/x86_64/root.log

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