tree: https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux-next.git 20210910-firmware-builtin head: 40b3be7167817d8c02ed8514b6ef17ba8b4a1c0c commit: 901fa5ebf866856ccd05ebc532f3a27786f7966e [2/11] firmware_loader: formalize built-in firmware API config: riscv-randconfig-c006-20210913 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 261cbe98c38f8c1ee1a482fe76511110e790f58a) 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 riscv cross compiling tool for clang build # apt-get install binutils-riscv64-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux-next.git/com... git remote add mcgrof-next https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux-next.git git fetch --no-tags mcgrof-next 20210910-firmware-builtin git checkout 901fa5ebf866856ccd05ebc532f3a27786f7966e # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=riscv 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 >>): bool firmware_is_builtin(const struct firmware *fw) ^ drivers/base/firmware_loader/builtin/main.c:36:1: note: declare 'static' if the function is not intended to be used outside of this translation unit bool firmware_is_builtin(const struct firmware *fw) ^ static 1 warning generated. vim +/firmware_is_builtin +36 drivers/base/firmware_loader/builtin/main.c 35 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org