sound/soc/ti/j721e-evm.c:528:34: warning: unused variable 'j721e_audio_of_match'

[kernel test robot]

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: a1bffa48745afbb54cb4f873bba783b2ae8be042
commit: 6748d05590594837e42dfa975879fb275099f0b2 ASoC: ti: Add custom machine driver for j721e EVM (CPB and IVI)
date: 3 months ago
config: x86_64-randconfig-r033-20200927 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project a83eb048cb9a75da7a07a9d5318bbdbf54885c87)
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
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6748d05590594837e42dfa975879fb275099f0b2
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout 6748d05590594837e42dfa975879fb275099f0b2
# 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: kernel test robot <l...@intel.com>

All warnings (new ones prefixed by >>):

>> sound/soc/ti/j721e-evm.c:528:34: warning: unused variable 'j721e_audio_of_match' [-Wunused-const-variable]
static const struct of_device_id j721e_audio_of_match[] = {
^
1 warning generated.

vim +/j721e_audio_of_match +528 sound/soc/ti/j721e-evm.c

527
> 528 static const struct of_device_id j721e_audio_of_match[] = {
529 {
530 .compatible = "ti,j721e-cpb-audio",
531 .data = &j721e_cpb_data,
532 }, {
533 .compatible = "ti,j721e-cpb-ivi-audio",
534 .data = &j721e_cpb_ivi_data,
535 },
536 { },
537 };
538 MODULE_DEVICE_TABLE(of, j721e_audio_of_match);
539

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

[Peter Ujfalusi]

Right, in the attached .config:
# CONFIG_OF is not set

There must be a clean way to handle this without extensive ifedfery...

> vim +/j721e_audio_of_match +528 sound/soc/ti/j721e-evm.c
>
> 527
> > 528 static const struct of_device_id j721e_audio_of_match[] = {
> 529 {
> 530 .compatible = "ti,j721e-cpb-audio",
> 531 .data = &j721e_cpb_data,
> 532 }, {
> 533 .compatible = "ti,j721e-cpb-ivi-audio",
> 534 .data = &j721e_cpb_ivi_data,
> 535 },
> 536 { },
> 537 };
> 538 MODULE_DEVICE_TABLE(of, j721e_audio_of_match);
> 539
>
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuil...@lists.01.org
>

- Péter

Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki

[Nick Desaulniers]

Pretty sure I just saw a patch go by wrapping another device table
definition in #ifdef CONFIG_OF, so it's not unusual.

>
> > vim +/j721e_audio_of_match +528 sound/soc/ti/j721e-evm.c
> >
> > 527
> > > 528 static const struct of_device_id j721e_audio_of_match[] = {
> > 529 {
> > 530 .compatible = "ti,j721e-cpb-audio",
> > 531 .data = &j721e_cpb_data,
> > 532 }, {
> > 533 .compatible = "ti,j721e-cpb-ivi-audio",
> > 534 .data = &j721e_cpb_ivi_data,
> > 535 },
> > 536 { },
> > 537 };
> > 538 MODULE_DEVICE_TABLE(of, j721e_audio_of_match);
> > 539
> >
> > ---
> > 0-DAY CI Kernel Test Service, Intel Corporation
> > https://lists.01.org/hyperkitty/list/kbuil...@lists.01.org
> >
>
> - Péter
>
> Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
> Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki
>

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--
Thanks,
~Nick Desaulniers

[Mark Brown]

On Mon, Sep 28, 2020 at 10:52:54AM -0700, Nick Desaulniers wrote:
> On Mon, Sep 28, 2020 at 12:27 AM 'Peter Ujfalusi' via Clang Built

> > Right, in the attached .config:
> > # CONFIG_OF is not set

> > There must be a clean way to handle this without extensive ifedfery...

> Pretty sure I just saw a patch go by wrapping another device table
> definition in #ifdef CONFIG_OF, so it's not unusual.

It's the standard solution, it's just not as clean as would be ideal :/

[Peter Ujfalusi]

The ifdef would be preferred if the driver could work in non DT boot (to
save few bytes) but since it is not the case here:

https://lore.kernel.org/alsa-devel/20200928074330.130...@ti.com/

Not much point to size optimize for randconfig builds ;)

[Mark Brown]

On Tue, Sep 29, 2020 at 09:00:02AM +0300, Peter Ujfalusi wrote:

> The ifdef would be preferred if the driver could work in non DT boot (to
> save few bytes) but since it is not the case here:

What I'd *really* like would be something in the of_match_ptr() that
flagged that there's a reference to the table for the purposes of the
warning but still lets the table be eliminated by the linker.