On Mon, Dec 14, 2020 at 03:12:34PM +0800, kernel test robot wrote: > 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) Do we actually need to fix these? It's asmlinkage and called from assembly, it wouldn't understand a prototype anyway.