tree: https://github.com/frank-w/BPI-R2-4.14 5.13-rc head: 3dfc4a057833e2735df50d6514e606ba3ef2ac81 commit: 87619143722070d84579264114c00cbf9f893140 [7/17] mt6625l: add changes outside driver dir config: x86_64-randconfig-r024-20210510 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 492173d42b32cb91d5d0d72d5ed84fcab80d059a) 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://github.com/frank-w/BPI-R2-4.14/commit/87619143722070d84579264114c... git remote add frank-w-bpi-r2-4.14 https://github.com/frank-w/BPI-R2-4.14 git fetch --no-tags frank-w-bpi-r2-4.14 5.13-rc git checkout 87619143722070d84579264114c00cbf9f893140 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=x86_64 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 >>): struct regmap *pwrap_node_to_regmap(struct device_node *np) ^ drivers/soc/mediatek/mtk-pmic-wrap.c:2077:1: note: declare 'static' if the function is not intended to be used outside of this translation unit struct regmap *pwrap_node_to_regmap(struct device_node *np) ^ static 1 warning generated. vim +/pwrap_node_to_regmap +2077 drivers/soc/mediatek/mtk-pmic-wrap.c 2076 2078 { 2079 struct platform_device *pdev; 2080 struct pmic_wrapper *wrp; 2081 pdev = of_find_device_by_node(np); 2082 if (!pdev) 2083 return ERR_PTR(-ENODEV); 2084 wrp = platform_get_drvdata(pdev); 2085 return wrp->regmap; 2086 } 2087 EXPORT_SYMBOL_GPL(pwrap_node_to_regmap); 2088 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org