linux-kernel - Re: [PATCH] PM / OPP: avoid maybe-uninitialized warning

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Date:   Thu, 15 Sep 2016 14:45:49 -0700
From:   Stephen Boyd <sboyd@...eaurora.org>
To:     Arnd Bergmann <arnd@...db.de>, Viresh Kumar <vireshk@...nel.org>,
        Nishanth Menon <nm@...com>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PM / OPP: avoid maybe-uninitialized warning

On 09/15/2016 08:38 AM, Arnd Bergmann wrote:
> When CONFIG_OPTIMIZE_INLINING is set and we are building with -Wmaybe-uninitialized
> enabled, we can get a warning for the opp core driver:
>
> drivers/base/power/opp/core.c: In function 'dev_pm_opp_set_rate':
> drivers/base/power/opp/core.c:560:8: warning: 'ou_volt_min' may be used uninitialized in this function [-Wmaybe-uninitialized]
>
> This has only now appeared as a result of commit 797da5598f3a ("PM / devfreq:
> Add COMPILE_TEST for build coverage"), which makes the driver visible in
> some configurations that didn't have it before.
>
> The warning is a false positive that I got with gcc-6.1.1, but there is
> a simple workaround in removing the local variables that we get warnings
> for (all three are affected depending on the configuration). This also
> makes the code easier to read.
>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Reviewed-by: Stephen Boyd <sboyd@...eaurora.org>

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