tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: a90af8f15bdc9449ee2d24e1d73fa3f7e8633f81 commit: 125ab5d588b0b3b842064c4d53a666ca74521ae8 ASoC: mediatek: mt8192: add platform driver date: 1 year, 1 month ago config: arm64-randconfig-r024-20211115 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project fbe72e41b99dc7994daac300d208a955be3e4a0a) 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 arm64 cross compiling tool for clang build # apt-get install binutils-aarch64-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 125ab5d588b0b3b842064c4d53a666ca74521ae8 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=arm64 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 >>): sound/soc/mediatek/mt8192/mt8192-afe-pcm.c:70:5: warning: no previous prototype for function 'mt8192_get_memif_pbuf_size' [-Wmissing-prototypes] int mt8192_get_memif_pbuf_size(struct snd_pcm_substream *substream) ^ sound/soc/mediatek/mt8192/mt8192-afe-pcm.c:70:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int mt8192_get_memif_pbuf_size(struct snd_pcm_substream *substream) ^ static static const struct dev_pm_ops mt8192_afe_pm_ops = { ^ 2 warnings generated. vim +/mt8192_afe_pm_ops +2368 sound/soc/mediatek/mt8192/mt8192-afe-pcm.c 2367 2369 SET_RUNTIME_PM_OPS(mt8192_afe_runtime_suspend, 2370 mt8192_afe_runtime_resume, NULL) 2371 }; 2372 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org