linux-kernel - Re: sound/soc/codecs/zl38060.c:614:34: warning: unused variable 'zl38_dt

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Date:   Fri, 10 Jul 2020 13:24:59 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Nathan Chancellor <natechancellor@...il.com>
Cc:     kernel test robot <lkp@...el.com>,
        Sven Van Asbroeck <thesven73@...il.com>,
        kbuild-all@...ts.01.org, clang-built-linux@...glegroups.com,
        linux-kernel@...r.kernel.org
Subject: Re: sound/soc/codecs/zl38060.c:614:34: warning: unused variable
 'zl38_dt_ids'

On Thu, Jul 09, 2020 at 07:41:00PM -0700, Nathan Chancellor wrote:

> When CONFIG_SND_SOC_ZL38060 is y, MODULE_DEVICE_TABLE expands to nothing
> so zl38_dt_ids will be unused. This is a pretty common construct in the
> kernel and the only way I can think of to resolve this through the code
> is by adding __used annotations to all of these variables, which I think
> is overkill for this.

> Personally, I think this warning should be downgraded to W=2, thoughts?

We've had that warning available for ever, we shouldn't need to disable
it now.  I had thought there was supposed to be magic which caused
of_match_ptr() to make things look referenced when !OF but don't seem to
actually see any sign of it.  The other thing is to just have ifdefs
around the table.

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