[kbuild-all] drivers/firmware/efi/libstub/skip_spaces.c:6:7: warning: no previous prototype for 'skip_spaces'

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 623f6dc593eaf98b91916836785278eddddaacf8 commit: 91d150c0cc637b9d9d6394936add7cd2b7ccc410 efi/libstub: Clean up command line parsing routine date: 4 months ago config: arm-randconfig-r002-20200611 (attached as .config) compiler: arm-linux-gnueabi-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 checkout 91d150c0cc637b9d9d6394936add7cd2b7ccc410 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm 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 <<): 6 | char *skip_spaces(const char *str) | ^~~~~~~~~~~ -- 83 | unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base) | ^~~~~~~~~~~~~~~ 108 | long simple_strtol(const char *cp, char **endp, unsigned int base) | ^~~~~~~~~~~~~ vim +/skip_spaces +6 drivers/firmware/efi/libstub/skip_spaces.c 5 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org