Hi Arnd, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 259cbfc98c55ba3b6ef6e61fb7cfc3751dfded1e commit: 6f5d248d05db9c4991366154f1a657a630faa583 [129/5679] ARM: iop32x: use GENERIC_IRQ_MULTI_HANDLER config: arm-buildonly-randconfig-r004-20220214 (https://download.01.org/0day-ci/archive/20220214/202202141809.zCYU3Uhb-lkp@xxxxxxxxx/config) compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project ea071884b0cc7210b3cc5fe858f0e892a779a23b) 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 arm cross compiling tool for clang build # apt-get install binutils-arm-linux-gnueabi # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=6f5d248d05db9c4991366154f1a657a630faa583 git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git fetch --no-tags linux-next master git checkout 6f5d248d05db9c4991366154f1a657a630faa583 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): >> arch/arm/mach-iop32x/cp6.c:10:6: warning: no previous prototype for function 'iop_enable_cp6' [-Wmissing-prototypes] void iop_enable_cp6(void) ^ arch/arm/mach-iop32x/cp6.c:10:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void iop_enable_cp6(void) ^ static arch/arm/mach-iop32x/cp6.c:43:13: warning: no previous prototype for function 'iop_init_cp6_handler' [-Wmissing-prototypes] void __init iop_init_cp6_handler(void) ^ arch/arm/mach-iop32x/cp6.c:43:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void __init iop_init_cp6_handler(void) ^ static 2 warnings generated. vim +/iop_enable_cp6 +10 arch/arm/mach-iop32x/cp6.c 9 > 10 void iop_enable_cp6(void) 11 { 12 u32 temp; 13 14 /* enable cp6 access */ 15 asm volatile ( 16 "mrc p15, 0, %0, c15, c1, 0\n\t" 17 "orr %0, %0, #(1 << 6)\n\t" 18 "mcr p15, 0, %0, c15, c1, 0\n\t" 19 "mrc p15, 0, %0, c15, c1, 0\n\t" 20 "mov %0, %0\n\t" 21 "sub pc, pc, #4 @ cp_wait\n\t" 22 : "=r"(temp)); 23 } 24 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
