Hi Kiwoong, [FYI, it's a private test report for your RFC patch.] [auto build test WARNING on scsi/for-next] [also build test WARNING on mkp-scsi/for-next v5.8-rc1 next-20200618] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Kiwoong-Kim/support-various-valu... base: https://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi.git for-next config: x86_64-allyesconfig (attached as .config) compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 63700971ac9cdf198faa4a3a7c226fa579e49206) 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 # 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 <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>, old ones prefixed by <<): void ufshcd_set_dev_values(struct ufs_hba *hba, struct ufs_dev_value *value) ^ drivers/scsi/ufs/ufshcd.c:6941:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void ufshcd_set_dev_values(struct ufs_hba *hba, struct ufs_dev_value *value) ^ static drivers/scsi/ufs/ufshcd.c:215:1: warning: unused function 'ufs_get_dev_specific_value' [-Wunused-function] ufs_get_dev_specific_value(struct ufs_hba *hba, ^ 2 warnings generated. vim +/ufshcd_set_dev_values +6941 drivers/scsi/ufs/ufshcd.c 6940 6942 { 6943 struct ufs_dev_value *f; 6944 struct ufs_dev_info *dev_info = &hba->dev_info; 6945 6946 if (!value) 6947 return; 6948 6949 for (f = value; f->val; f++) { 6950 if ((f->wmanufacturerid == dev_info->wmanufacturerid || 6951 f->wmanufacturerid == UFS_ANY_VENDOR) && 6952 ((dev_info->model && 6953 STR_PRFX_EQUAL(f->model, dev_info->model)) || 6954 !strcmp(f->model, UFS_ANY_MODEL))) { 6955 f->enable = true; 6956 hba->dev_value[f->key] = f->val; 6957 } 6958 } 6959 } 6960 EXPORT_SYMBOL_GPL(ufshcd_set_dev_values); 6961 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org