[kbuild-all] Re: arch/arm64/kernel/entry-common.c:68:25: warning: no previous prototype for 'el1_sync_handler'

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 2c85ebc57b3e1817b6ce1a6b703928e113a90442 commit: ed3768db588291ddb5dc794daed12cc751373566 arm64: entry: convert el1_sync to C date: 1 year, 2 months ago config: arm64-randconfig-r021-20201214 (attached as .config) compiler: aarch64-linux-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 # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout ed3768db588291ddb5dc794daed12cc751373566 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm64 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 >>): >> arch/arm64/kernel/entry-common.c:68:25: warning: no previous prototype for 'el1_sync_handler' [-Wmissing-prototypes] 68 | asmlinkage void notrace el1_sync_handler(struct pt_regs *regs)