tree: https://git.linaro.org/people/lee.jones/linux.git tb-fix-w1-warnings head: 4100a70a722e6bd00b7f9d8b84e52c86060952ca commit: faaaa667897d3e3a323ab678b8e88e1d8343bff2 [100/200] staging: rtw_ioctl_set: Move 'channel_table' to the only place it's used config: arc-allyesconfig (attached as .config) compiler: arceb-elf-gcc (GCC) 9.3.0 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 git remote add lee-linaro https://git.linaro.org/people/lee.jones/linux.git git fetch --no-tags lee-linaro tb-fix-w1-warnings git checkout faaaa667897d3e3a323ab678b8e88e1d8343bff2 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross W=1 ARCH=arc If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): 27 | } channel_table[] = { { RT_CHANNEL_DOMAIN_FCC, "US" }, | ^~~~~~~~~~~~~ drivers/staging/rtl8188eu/core/rtw_ioctl_set.c:17:3: note: previous definition of 'channel_table' was here 17 | } channel_table[] = { { RT_CHANNEL_DOMAIN_FCC, "US" }, | ^~~~~~~~~~~~~ drivers/staging/rtl8188eu/core/rtw_ioctl_set.c:17:3: warning: 'channel_table' defined but not used [-Wunused-const-variable=] vim +/channel_table +27 drivers/staging/rtl8188eu/core/rtw_ioctl_set.c 23 24 static const struct { 25 int channel_plan; 26 char *name; 28 { RT_CHANNEL_DOMAIN_ETSI, "EU" }, 29 { RT_CHANNEL_DOMAIN_MKK, "JP" }, 30 { RT_CHANNEL_DOMAIN_CHINA, "CN"} }; 31 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org