[kbuild-all] [ast-bpf:relo_core 2/11] tools/lib/bpf/relo_core.c:50:6: error: no previous prototype for 'libbpf_print'

tree: https://git.kernel.org/pub/scm/linux/kernel/git/ast/bpf.git relo_core head: f19d8aee9c6849dbfd77bc472b7b5c9bb28f329f commit: 96649f75bfb209c3562106becb7bed3e37b05c82 [2/11] bpf: Prepare relo_core.c for kernel duty. config: m68k-allmodconfig (attached as .config) compiler: m68k-linux-gcc (GCC) 11.2.0 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/ast/bpf.git/commit/?id=96... git remote add ast-bpf https://git.kernel.org/pub/scm/linux/kernel/git/ast/bpf.git git fetch --no-tags ast-bpf relo_core git checkout 96649f75bfb209c3562106becb7bed3e37b05c82 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=m68k If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): 50 | void libbpf_print(enum libbpf_print_level level, | ^~~~~~~~~~~~ tools/lib/bpf/relo_core.c: In function 'bpf_core_apply_relo_insn': 1363 | } | ^ cc1: all warnings being treated as errors vim +/libbpf_print +50 tools/lib/bpf/relo_core.c 43 44 enum libbpf_print_level { 45 LIBBPF_WARN, 46 LIBBPF_INFO, 47 LIBBPF_DEBUG, 48 }; 49 __attribute__((format(printf, 2, 3))) 51 const char *format, ...) 52 { 53 va_list args; 54 55 va_start(args, format); 56 vprintk(format, args); 57 va_end(args); 58 } 59 #define __pr(level, fmt, ...) \ 60 do { \ 61 libbpf_print(level, "libbpf: " fmt, ##__VA_ARGS__); \ 62 } while (0) 63 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org