linux-kernel - Re: [PATCH v1] sched/topology: Make compiler happy about unused constant definitions

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Date:   Mon, 24 Aug 2020 18:09:41 +0100
From:   Valentin Schneider <valentin.schneider@....com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        linux-kernel@...r.kernel.org,
        Dietmar Eggemann <dietmar.eggemann@....com>
Subject: Re: [PATCH v1] sched/topology: Make compiler happy about unused constant definitions


Hi,

On 24/08/20 16:39, Andy Shevchenko wrote:
> Compilation of almost each file ends up with
>
>  In file included from .../include/linux/energy_model.h:10,
>                 from .../include/linux/device.h:16,
>                 from .../drivers/spi/spi.c:8:
>  .../include/linux/sched/topology.h:30:27: warning: ‘SD_DEGENERATE_GROUPS_MASK’ defined but not used [-Wunused-const-variable=]
>     30 | static const unsigned int SD_DEGENERATE_GROUPS_MASK =
>        |                           ^~~~~~~~~~~~~~~~~~~~~~~~~
>  ...
>
> Make compiler happy by annotating the static constants with __maybwe_unused.
>

That should see some use as long as the build is for SMP. This whole region
is guarded by #ifdef CONFIG_SMP, so an !SMP build shouldn't trigger this.

With what config/kernel are you getting this?