linux-kernel - Re: sound/soc/meson/t9015.c:315:34: warning: unused variable 't9015

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Date:   Wed, 10 Jun 2020 17:31:03 +0200
From:   Jerome Brunet <jbrunet@...libre.com>
To:     kbuild test robot <lkp@...el.com>
Cc:     kbuild-all@...ts.01.org, clang-built-linux@...glegroups.com,
        linux-kernel@...r.kernel.org, Mark Brown <broonie@...nel.org>
Subject: Re: sound/soc/meson/t9015.c:315:34: warning: unused variable 't9015_ids'


On Sun 31 May 2020 at 05:00, kbuild test robot <lkp@...el.com> wrote:

> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   ffeb595d84811dde16a28b33d8a7cf26d51d51b3
> commit: 33901f5b9b16d212ee58865e9e8e80fc813f12da ASoC: meson: add t9015 internal DAC driver
> date:   3 months ago
> config: x86_64-randconfig-r033-20200531 (attached as .config)
> compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 2388a096e7865c043e83ece4e26654bd3d1a20d5)
> reproduce (this is a W=1 build):
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # install x86_64 cross compiling tool for clang build
>         # apt-get install binutils-x86-64-linux-gnu
>         git checkout 33901f5b9b16d212ee58865e9e8e80fc813f12da
>         # save the attached .config to linux build tree
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kbuild test robot <lkp@...el.com>
>
> All warnings (new ones prefixed by >>, old ones prefixed by <<):
>
>>> sound/soc/meson/t9015.c:315:34: warning: unused variable 't9015_ids' [-Wunused-const-variable]
> static const struct of_device_id t9015_ids[] = {
> ^
> 1 warning generated.
>
> vim +/t9015_ids +315 sound/soc/meson/t9015.c
>
>    314	
>  > 315	static const struct of_device_id t9015_ids[] = {
>    316		{ .compatible = "amlogic,t9015", },
>    317		{ }
>    318	};
>    319	MODULE_DEVICE_TABLE(of, t9015_ids);
>    320	

Hi,

I'm not sure what to do with this report.
I tried to reproduce has instructed, the log is full of warnings and the
compilation eventually fails to link.

It seems that most (if not all) drivers with a MODULE_DEVICE_TABLE() show
this warning with the provided .config (COMPILE_TEST).

When compiled with gcc, no such warning is shown.
I can remove COMPILE_TEST for this driver, it will make the warning go
away but I'm not sure it is appropriate.

>
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org