tree:   https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux-next.git 20210908-firmware-builtin-v4
head:   1c69d6a17750179d68bcaf6b16f9a08d2e475989
commit: 79e9fce20ee88ffe37542a66277628e6c53dde14 [2/11] firmware_loader: formalize built-in firmware API
config: hexagon-buildonly-randconfig-r004-20210910 (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
        # https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux-next.git/commit/?id=79e9fce20ee88ffe37542a66277628e6c53dde14
        git remote add mcgrof-next https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux-next.git
        git fetch --no-tags mcgrof-next 20210908-firmware-builtin-v4
        git checkout 79e9fce20ee88ffe37542a66277628e6c53dde14
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=hexagon 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

>> drivers/base/firmware_loader/builtin/main.c:36:6: error: no previous prototype for function 'firmware_is_builtin' [-Werror,-Wmissing-prototypes]
   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 error generated.


vim +/firmware_is_builtin +36 drivers/base/firmware_loader/builtin/main.c

    35	
  > 36	bool firmware_is_builtin(const struct firmware *fw)

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org