tree: https://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator.git for-5.10 head: 23ce1e5c27396e39efabb58714142e8f10ce1f0c commit: 38573472278da49e2ab588062d88bc2f0c11a325 [10/21] regulator: rpi-panel: Add regulator/backlight driver for RPi panel config: x86_64-randconfig-a005-20200824 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project b587ca93be114d07ec3bf654add97d7872325281) 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 git checkout 38573472278da49e2ab588062d88bc2f0c11a325 # 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 >>): >> drivers/regulator/rpi-panel-attiny-regulator.c:196:34: warning: unused variable 'attiny_dt_ids' [-Wunused-const-variable] static const struct of_device_id attiny_dt_ids[] = { ^ 1 warning generated. # https://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator.git/com... git remote add regulator https://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator.git git fetch --no-tags regulator for-5.10 git checkout 38573472278da49e2ab588062d88bc2f0c11a325 vim +/attiny_dt_ids +196 drivers/regulator/rpi-panel-attiny-regulator.c 195 > 196 static const struct of_device_id attiny_dt_ids[] = {