tree: https://github.com/linuxppc/linux next-test head: 77ba1e2abc7474c5321cbf8d90366ec69150d0a2 commit: 74407339b3acb99f37b303e489d7c85676e52ce8 [159/170] powerpc/lib/code-patching: Set up Strict RWX patching earlier config: powerpc64-randconfig-r011-20210620 (attached as .config) compiler: powerpc-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://github.com/linuxppc/linux/commit/74407339b3acb99f37b303e489d7c856... git remote add linuxppc https://github.com/linuxppc/linux git fetch --no-tags linuxppc next-test git checkout 74407339b3acb99f37b303e489d7c85676e52ce8 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=powerpc64 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/powerpc/lib/code-patching.c:76:12: warning: no previous prototype for 'poking_init' [-Wmissing-prototypes] 76 | int __init poking_init(void) | ^~~~~~~~~~~ vim +/poking_init +76 arch/powerpc/lib/code-patching.c 70 71 /* 72 * Although BUG_ON() is rude, in this case it should only happen if ENOMEM, and 73 * we judge it as being preferable to a kernel that will crash later when 74 * someone tries to use patch_instruction(). 75 */ > 76 int __init poking_init(void) 77 { 78 BUG_ON(!cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, 79 "powerpc/text_poke:online", text_area_cpu_up, 80 text_area_cpu_down)); 81 82 return 0; 83 } 84 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org