Hi Michael, FYI, the error/warning still remains. tree: https://github.com/intel/linux-intel-lts.git 5.4/yocto head: 10c3d69bc60059b194dcfa816cbc1240ffb0431d commit: fb165c21e3deb44542074fcf59fc5afeba4052d6 [10970/18530] ASoC: codec: tlv3204: Enable TDM audio support config: mips-randconfig-r013-20211118 (attached as .config) 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 mips cross compiling tool for clang build # apt-get install binutils-mips-linux-gnu # https://github.com/intel/linux-intel-lts/commit/fb165c21e3deb44542074fcf5... git remote add intel-lts https://github.com/intel/linux-intel-lts.git git fetch --no-tags intel-lts 5.4/yocto git checkout fb165c21e3deb44542074fcf59fc5afeba4052d6 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=mips If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): void aic32x4_reset_adc(struct snd_soc_component *component) ^ sound/soc/codecs/tlv320aic32x4.c:53:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void aic32x4_reset_adc(struct snd_soc_component *component) ^ static 1 warning generated. vim +/aic32x4_reset_adc +53 sound/soc/codecs/tlv320aic32x4.c 52 54 { 55 u32 adc_reg; 56 57 adc_reg = snd_soc_component_read32(component, AIC32X4_ADCSETUP); 58 snd_soc_component_write(component, AIC32X4_ADCSETUP, adc_reg | 59 AIC32X4_LADC_EN | AIC32X4_RADC_EN); 60 snd_soc_component_write(component, AIC32X4_ADCSETUP, adc_reg); 61 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org