Re: [PATCH v2 8/8] ASoC: cs35l56: Add driver for Cirrus Logic CS35L56

[Richard Fitzgerald <rf@opensource.cirrus.com>]

On 16/03/2023 20:15, kernel test robot wrote:
> Hi Richard,
> 
> Thank you for the patch! Yet something to improve:
> 
> [auto build test ERROR on broonie-sound/for-next]
> [also build test ERROR on linus/master v6.3-rc2 next-20230316]
> [If your patch is applied to the wrong git tree, kindly drop us a note.
> And when submitting patch, we suggest to use '--base' as documented in
> https://git-scm.com/docs/git-format-patch#_base_tree_information]
> 
> url:    https://github.com/intel-lab-lkp/linux/commits/Richard-Fitzgerald-via-Alsa-devel/ASoC-wm_adsp-Use-no_core_startstop-to-prevent-creating-preload-control/20230313-235605
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-next
> patch link:    https://lore.kernel.org/r/167872265923.26.336497278776737619%40mailman-core.alsa-project.org
> patch subject: [PATCH v2 8/8] ASoC: cs35l56: Add driver for Cirrus Logic CS35L56
> config: s390-randconfig-r044-20230313 (https://download.01.org/0day-ci/archive/20230317/202303170422.ZYpOtc4P-lkp@intel.com/config)
> compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project 67409911353323ca5edf2049ef0df54132fa1ca7)
> 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 s390 cross compiling tool for clang build
>          # apt-get install binutils-s390x-linux-gnu
>          # https://github.com/intel-lab-lkp/linux/commit/5856c94d659f9c9963f5c37762cf201e1f1765e9
>          git remote add linux-review https://github.com/intel-lab-lkp/linux
>          git fetch --no-tags linux-review Richard-Fitzgerald-via-Alsa-devel/ASoC-wm_adsp-Use-no_core_startstop-to-prevent-creating-preload-control/20230313-235605
>          git checkout 5856c94d659f9c9963f5c37762cf201e1f1765e9
>          # save the config file
>          mkdir build_dir && cp config build_dir/.config
>          COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=s390 olddefconfig
>          COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=s390 SHELL=/bin/bash
> 
> If you fix the issue, kindly add following tag where applicable
> | Reported-by: kernel test robot <lkp@intel.com>
> | Link: https://lore.kernel.org/oe-kbuild-all/202303170422.ZYpOtc4P-lkp@intel.com/
> 
> All errors (new ones prefixed by >>):
> 
>     s390x-linux-ld: sound/soc/codecs/cs35l56.o: in function `cs35l56_dsp_work':
>>> sound/soc/codecs/cs35l56.c:887: undefined reference to `sdw_write_no_pm'
>>> s390x-linux-ld: sound/soc/codecs/cs35l56.c:888: undefined reference to `sdw_read_no_pm'
>>> s390x-linux-ld: sound/soc/codecs/cs35l56.c:889: undefined reference to `sdw_write_no_pm'
>     s390x-linux-ld: sound/soc/codecs/cs35l56.c:953: undefined reference to `sdw_write_no_pm'
>     s390x-linux-ld: sound/soc/codecs/cs35l56.o: in function `cs35l56_sdw_dai_hw_params':
>>> sound/soc/codecs/cs35l56.c:710: undefined reference to `sdw_stream_add_slave'
>     s390x-linux-ld: sound/soc/codecs/cs35l56.o: in function `cs35l56_sdw_dai_hw_free':
>>> sound/soc/codecs/cs35l56.c:729: undefined reference to `sdw_stream_remove_slave'
> 

I don't understand what's happened here.
include/linux/soundwire/sdw.h provides inline dummy versions of these
functions if !IS_ENABLED(CONFIG_SOUNDWIRE) so how can they be
undefined reference?