tree: git://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git sched/headers head: 1a880941a087613ed42f77001229edfcf75ea8a5 commit: 4e8fb52df12408e936d71ebf34aaa990fd61e736 [571/2382] objtool/kallsyms: Copy the symbol name and offset to the new __kallsyms ELF section config: x86_64-randconfig-a015-20220109 (https://download.01.org/0day-ci/archive/20220113/202201131950.VXD05up8-lk...) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project d1021978b8e7e35dcc30201ca1731d64b5a602a8) 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/mingo/tip.git/commit/?id=... git remote add mingo-tip git://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git git fetch --no-tags mingo-tip sched/headers git checkout 4e8fb52df12408e936d71ebf34aaa990fd61e736 # 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=x86_64 prepare If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; Note: the mingo-tip/sched/headers HEAD 1a880941a087613ed42f77001229edfcf75ea8a5 builds fine. It only hurts bisectability. All errors (new ones prefixed by >>): sec_kallsyms->len += data->d_size; ~~~~~~~~~~~~ ^ 1 error generated. make[4]: *** [tools/build/Makefile.build:96: tools/objtool/elf.o] Error 1 make[4]: *** Waiting for unfinished jobs.... make[3]: *** [Makefile:56: tools/objtool/objtool-in.o] Error 2 make[2]: *** [Makefile:69: objtool] Error 2 make[1]: *** [Makefile:1349: tools/objtool] Error 2 In file included from arch/x86/kernel/asm-offsets.c:34: arch/x86/kernel/../../../kernel/sched/per_task_area_struct_defs.h:13:13: warning: no previous prototype for function 'per_task_common' [-Wmissing-prototypes] void __used per_task_common(void) ^ arch/x86/kernel/../../../kernel/sched/per_task_area_struct_defs.h:13:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void __used per_task_common(void) ^ static 1 warning generated. make[1]: Target 'prepare' not remade because of errors. make: *** [Makefile:219: __sub-make] Error 2 make: Target 'prepare' not remade because of errors. --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org