tree: https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git bpf/attach head: 309b598ba309017a35c6659304b00395d39c0ecb commit: 3cc705bd3baca93ef99d89d069bcb53c8c6d1626 [5/18] attach test config: arm-randconfig-r012-20201018 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 2a75e956e5ce7ea212333a86fe65fc68185cbf48) 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/jolsa/perf.git/commit/?id... git remote add jolsa-perf https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git git fetch --no-tags jolsa-perf bpf/attach git checkout 3cc705bd3baca93ef99d89d069bcb53c8c6d1626 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm 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 >>): net/bpf/test_run.c:121:14: warning: no previous prototype for function 'bpf_fentry_test1' [-Wmissing-prototypes] int noinline bpf_fentry_test1(int a) ^ net/bpf/test_run.c:121:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int noinline bpf_fentry_test1(int a) ^ static net/bpf/test_run.c:126:14: warning: no previous prototype for function 'bpf_fentry_test2' [-Wmissing-prototypes] int noinline bpf_fentry_test2(int a, u64 b) ^ net/bpf/test_run.c:126:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int noinline bpf_fentry_test2(int a, u64 b) ^ static net/bpf/test_run.c:131:14: warning: no previous prototype for function 'bpf_fentry_test3' [-Wmissing-prototypes] int noinline bpf_fentry_test3(char a, int b, u64 c) ^ net/bpf/test_run.c:131:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int noinline bpf_fentry_test3(char a, int b, u64 c) ^ static net/bpf/test_run.c:136:14: warning: no previous prototype for function 'bpf_fentry_test4' [-Wmissing-prototypes] int noinline bpf_fentry_test4(void *a, char b, int c, u64 d) ^ net/bpf/test_run.c:136:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int noinline bpf_fentry_test4(void *a, char b, int c, u64 d) ^ static net/bpf/test_run.c:141:14: warning: no previous prototype for function 'bpf_fentry_test5' [-Wmissing-prototypes] int noinline bpf_fentry_test5(u64 a, void *b, short c, int d, u64 e) ^ net/bpf/test_run.c:141:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int noinline bpf_fentry_test5(u64 a, void *b, short c, int d, u64 e) ^ static net/bpf/test_run.c:146:14: warning: no previous prototype for function 'bpf_fentry_test6' [-Wmissing-prototypes] int noinline bpf_fentry_test6(u64 a, void *b, short c, int d, void *e, u64 f) ^ net/bpf/test_run.c:146:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int noinline bpf_fentry_test6(u64 a, void *b, short c, int d, void *e, u64 f) ^ static net/bpf/test_run.c:155:14: warning: no previous prototype for function 'bpf_fentry_test7' [-Wmissing-prototypes] int noinline bpf_fentry_test7(struct bpf_fentry_test_t *arg) ^ net/bpf/test_run.c:155:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int noinline bpf_fentry_test7(struct bpf_fentry_test_t *arg) ^ static net/bpf/test_run.c:160:14: warning: no previous prototype for function 'bpf_fentry_test8' [-Wmissing-prototypes] int noinline bpf_fentry_test8(struct bpf_fentry_test_t *arg) ^ net/bpf/test_run.c:160:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int noinline bpf_fentry_test8(struct bpf_fentry_test_t *arg) ^ static net/bpf/test_run.c:165:14: warning: no previous prototype for function 'bpf_modify_return_test' [-Wmissing-prototypes] int noinline bpf_modify_return_test(int a, int *b) ^ net/bpf/test_run.c:165:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int noinline bpf_modify_return_test(int a, int *b) ^ static ATTACH_TEST(0) ^ net/bpf/test_run.c:172:15: note: expanded from macro 'ATTACH_TEST' int noinline __PASTE(bpf_attach_test, __n)(void) { return 0; } ^ include/linux/compiler_types.h:60:22: note: expanded from macro '__PASTE' #define __PASTE(a,b) ___PASTE(a,b) ^ include/linux/compiler_types.h:59:23: note: expanded from macro '___PASTE' #define ___PASTE(a,b) a##b ^ <scratch space>:126:1: note: expanded from here bpf_attach_test0 ^ net/bpf/test_run.c:174:1: note: declare 'static' if the function is not intended to be used outside of this translation unit ATTACH_TEST(0) ^ static net/bpf/test_run.c:172:2: note: expanded from macro 'ATTACH_TEST' int noinline __PASTE(bpf_attach_test, __n)(void) { return 0; } ^ ATTACH_TEST(1) ^ net/bpf/test_run.c:172:15: note: expanded from macro 'ATTACH_TEST' int noinline __PASTE(bpf_attach_test, __n)(void) { return 0; } ^ include/linux/compiler_types.h:60:22: note: expanded from macro '__PASTE' #define __PASTE(a,b) ___PASTE(a,b) ^ include/linux/compiler_types.h:59:23: note: expanded from macro '___PASTE' #define ___PASTE(a,b) a##b ^ <scratch space>:127:1: note: expanded from here bpf_attach_test1 ^ net/bpf/test_run.c:175:1: note: declare 'static' if the function is not intended to be used outside of this translation unit ATTACH_TEST(1) ^ static net/bpf/test_run.c:172:2: note: expanded from macro 'ATTACH_TEST' int noinline __PASTE(bpf_attach_test, __n)(void) { return 0; } ^ ATTACH_TEST(2) ^ net/bpf/test_run.c:172:15: note: expanded from macro 'ATTACH_TEST' int noinline __PASTE(bpf_attach_test, __n)(void) { return 0; } ^ include/linux/compiler_types.h:60:22: note: expanded from macro '__PASTE' #define __PASTE(a,b) ___PASTE(a,b) ^ include/linux/compiler_types.h:59:23: note: expanded from macro '___PASTE' #define ___PASTE(a,b) a##b ^ <scratch space>:128:1: note: expanded from here bpf_attach_test2 ^ net/bpf/test_run.c:176:1: note: declare 'static' if the function is not intended to be used outside of this translation unit ATTACH_TEST(2) ^ static net/bpf/test_run.c:172:2: note: expanded from macro 'ATTACH_TEST' int noinline __PASTE(bpf_attach_test, __n)(void) { return 0; } ^ ATTACH_TEST(3) ^ net/bpf/test_run.c:172:15: note: expanded from macro 'ATTACH_TEST' int noinline __PASTE(bpf_attach_test, __n)(void) { return 0; } ^ include/linux/compiler_types.h:60:22: note: expanded from macro '__PASTE' #define __PASTE(a,b) ___PASTE(a,b) ^ include/linux/compiler_types.h:59:23: note: expanded from macro '___PASTE' #define ___PASTE(a,b) a##b ^ <scratch space>:129:1: note: expanded from here bpf_attach_test3 ^ net/bpf/test_run.c:177:1: note: declare 'static' if the function is not intended to be used outside of this translation unit ATTACH_TEST(3) ^ static net/bpf/test_run.c:172:2: note: expanded from macro 'ATTACH_TEST' int noinline __PASTE(bpf_attach_test, __n)(void) { return 0; } ^ ATTACH_TEST(4) ^ net/bpf/test_run.c:172:15: note: expanded from macro 'ATTACH_TEST' int noinline __PASTE(bpf_attach_test, __n)(void) { return 0; } ^ include/linux/compiler_types.h:60:22: note: expanded from macro '__PASTE' #define __PASTE(a,b) ___PASTE(a,b) ^ include/linux/compiler_types.h:59:23: note: expanded from macro '___PASTE' #define ___PASTE(a,b) a##b ^ <scratch space>:130:1: note: expanded from here bpf_attach_test4 ^ net/bpf/test_run.c:178:1: note: declare 'static' if the function is not intended to be used outside of this translation unit ATTACH_TEST(4) ^ static net/bpf/test_run.c:172:2: note: expanded from macro 'ATTACH_TEST' int noinline __PASTE(bpf_attach_test, __n)(void) { return 0; } ^ ATTACH_TEST(5) ^ net/bpf/test_run.c:172:15: note: expanded from macro 'ATTACH_TEST' int noinline __PASTE(bpf_attach_test, __n)(void) { return 0; } ^ include/linux/compiler_types.h:60:22: note: expanded from macro '__PASTE' #define __PASTE(a,b) ___PASTE(a,b) ^ include/linux/compiler_types.h:59:23: note: expanded from macro '___PASTE' #define ___PASTE(a,b) a##b ^ <scratch space>:131:1: note: expanded from here bpf_attach_test5 ^ net/bpf/test_run.c:179:1: note: declare 'static' if the function is not intended to be used outside of this translation unit ATTACH_TEST(5) ^ static net/bpf/test_run.c:172:2: note: expanded from macro 'ATTACH_TEST' int noinline __PASTE(bpf_attach_test, __n)(void) { return 0; } ^ ATTACH_TEST(6) ^ net/bpf/test_run.c:172:15: note: expanded from macro 'ATTACH_TEST' int noinline __PASTE(bpf_attach_test, __n)(void) { return 0; } ^ include/linux/compiler_types.h:60:22: note: expanded from macro '__PASTE' #define __PASTE(a,b) ___PASTE(a,b) ^ include/linux/compiler_types.h:59:23: note: expanded from macro '___PASTE' #define ___PASTE(a,b) a##b ^ <scratch space>:132:1: note: expanded from here bpf_attach_test6 ^ net/bpf/test_run.c:180:1: note: declare 'static' if the function is not intended to be used outside of this translation unit ATTACH_TEST(6) ^ static net/bpf/test_run.c:172:2: note: expanded from macro 'ATTACH_TEST' int noinline __PASTE(bpf_attach_test, __n)(void) { return 0; } ^ ATTACH_TEST(7) ^ net/bpf/test_run.c:172:15: note: expanded from macro 'ATTACH_TEST' int noinline __PASTE(bpf_attach_test, __n)(void) { return 0; } ^ include/linux/compiler_types.h:60:22: note: expanded from macro '__PASTE' #define __PASTE(a,b) ___PASTE(a,b) ^ include/linux/compiler_types.h:59:23: note: expanded from macro '___PASTE' #define ___PASTE(a,b) a##b ^ <scratch space>:133:1: note: expanded from here bpf_attach_test7 ^ net/bpf/test_run.c:181:1: note: declare 'static' if the function is not intended to be used outside of this translation unit ATTACH_TEST(7) ^ static net/bpf/test_run.c:172:2: note: expanded from macro 'ATTACH_TEST' int noinline __PASTE(bpf_attach_test, __n)(void) { return 0; } ^ ATTACH_TEST(8) ^ net/bpf/test_run.c:172:15: note: expanded from macro 'ATTACH_TEST' int noinline __PASTE(bpf_attach_test, __n)(void) { return 0; } ^ include/linux/compiler_types.h:60:22: note: expanded from macro '__PASTE' #define __PASTE(a,b) ___PASTE(a,b) ^ include/linux/compiler_types.h:59:23: note: expanded from macro '___PASTE' #define ___PASTE(a,b) a##b ^ <scratch space>:134:1: note: expanded from here bpf_attach_test8 ^ net/bpf/test_run.c:182:1: note: declare 'static' if the function is not intended to be used outside of this translation unit ATTACH_TEST(8) ^ static net/bpf/test_run.c:172:2: note: expanded from macro 'ATTACH_TEST' int noinline __PASTE(bpf_attach_test, __n)(void) { return 0; } ^ ATTACH_TEST(9) ^ net/bpf/test_run.c:172:15: note: expanded from macro 'ATTACH_TEST' int noinline __PASTE(bpf_attach_test, __n)(void) { return 0; } ^ include/linux/compiler_types.h:60:22: note: expanded from macro '__PASTE' #define __PASTE(a,b) ___PASTE(a,b) ^ include/linux/compiler_types.h:59:23: note: expanded from macro '___PASTE' #define ___PASTE(a,b) a##b ^ <scratch space>:135:1: note: expanded from here bpf_attach_test9 ^ net/bpf/test_run.c:183:1: note: declare 'static' if the function is not intended to be used outside of this translation unit ATTACH_TEST(9) ^ static net/bpf/test_run.c:172:2: note: expanded from macro 'ATTACH_TEST' int noinline __PASTE(bpf_attach_test, __n)(void) { return 0; } ^ ATTACH_TEST(10) ^ net/bpf/test_run.c:172:15: note: expanded from macro 'ATTACH_TEST' int noinline __PASTE(bpf_attach_test, __n)(void) { return 0; } ^ include/linux/compiler_types.h:60:22: note: expanded from macro '__PASTE' #define __PASTE(a,b) ___PASTE(a,b) ^ include/linux/compiler_types.h:59:23: note: expanded from macro '___PASTE' #define ___PASTE(a,b) a##b ^ <scratch space>:136:1: note: expanded from here bpf_attach_test10 ^ net/bpf/test_run.c:184:1: note: declare 'static' if the function is not intended to be used outside of this translation unit ATTACH_TEST(10) ^ static net/bpf/test_run.c:172:2: note: expanded from macro 'ATTACH_TEST' int noinline __PASTE(bpf_attach_test, __n)(void) { return 0; } ^ ATTACH_TEST(11) ^ net/bpf/test_run.c:172:15: note: expanded from macro 'ATTACH_TEST' int noinline __PASTE(bpf_attach_test, __n)(void) { return 0; } ^ include/linux/compiler_types.h:60:22: note: expanded from macro '__PASTE' #define __PASTE(a,b) ___PASTE(a,b) ^ include/linux/compiler_types.h:59:23: note: expanded from macro '___PASTE' #define ___PASTE(a,b) a##b ^ <scratch space>:137:1: note: expanded from here bpf_attach_test11 ^ net/bpf/test_run.c:185:1: note: declare 'static' if the function is not intended to be used outside of this translation unit ATTACH_TEST(11) ^ static net/bpf/test_run.c:172:2: note: expanded from macro 'ATTACH_TEST' int noinline __PASTE(bpf_attach_test, __n)(void) { return 0; } ^ ATTACH_TEST(12) ^ net/bpf/test_run.c:172:15: note: expanded from macro 'ATTACH_TEST' int noinline __PASTE(bpf_attach_test, __n)(void) { return 0; } ^ include/linux/compiler_types.h:60:22: note: expanded from macro '__PASTE' #define __PASTE(a,b) ___PASTE(a,b) ^ include/linux/compiler_types.h:59:23: note: expanded from macro '___PASTE' #define ___PASTE(a,b) a##b ^ <scratch space>:138:1: note: expanded from here bpf_attach_test12 ^ net/bpf/test_run.c:186:1: note: declare 'static' if the function is not intended to be used outside of this translation unit ATTACH_TEST(12) ^ static net/bpf/test_run.c:172:2: note: expanded from macro 'ATTACH_TEST' int noinline __PASTE(bpf_attach_test, __n)(void) { return 0; } ^ ATTACH_TEST(13) ^ net/bpf/test_run.c:172:15: note: expanded from macro 'ATTACH_TEST' int noinline __PASTE(bpf_attach_test, __n)(void) { return 0; } ^ include/linux/compiler_types.h:60:22: note: expanded from macro '__PASTE' #define __PASTE(a,b) ___PASTE(a,b) ^ include/linux/compiler_types.h:59:23: note: expanded from macro '___PASTE' #define ___PASTE(a,b) a##b ^ <scratch space>:139:1: note: expanded from here bpf_attach_test13 ^ net/bpf/test_run.c:187:1: note: declare 'static' if the function is not intended to be used outside of this translation unit ATTACH_TEST(13) ^ static net/bpf/test_run.c:172:2: note: expanded from macro 'ATTACH_TEST' int noinline __PASTE(bpf_attach_test, __n)(void) { return 0; } ^ ATTACH_TEST(14) ^ net/bpf/test_run.c:172:15: note: expanded from macro 'ATTACH_TEST' int noinline __PASTE(bpf_attach_test, __n)(void) { return 0; } ^ include/linux/compiler_types.h:60:22: note: expanded from macro '__PASTE' #define __PASTE(a,b) ___PASTE(a,b) ^ include/linux/compiler_types.h:59:23: note: expanded from macro '___PASTE' #define ___PASTE(a,b) a##b ^ <scratch space>:140:1: note: expanded from here bpf_attach_test14 ^ net/bpf/test_run.c:188:1: note: declare 'static' if the function is not intended to be used outside of this translation unit ATTACH_TEST(14) ^ static net/bpf/test_run.c:172:2: note: expanded from macro 'ATTACH_TEST' int noinline __PASTE(bpf_attach_test, __n)(void) { return 0; } ^ ATTACH_TEST(15) ^ net/bpf/test_run.c:172:15: note: expanded from macro 'ATTACH_TEST' int noinline __PASTE(bpf_attach_test, __n)(void) { return 0; } ^ include/linux/compiler_types.h:60:22: note: expanded from macro '__PASTE' #define __PASTE(a,b) ___PASTE(a,b) ^ include/linux/compiler_types.h:59:23: note: expanded from macro '___PASTE' #define ___PASTE(a,b) a##b ^ <scratch space>:141:1: note: expanded from here bpf_attach_test15 ^ net/bpf/test_run.c:189:1: note: declare 'static' if the function is not intended to be used outside of this translation unit ATTACH_TEST(15) ^ static net/bpf/test_run.c:172:2: note: expanded from macro 'ATTACH_TEST' int noinline __PASTE(bpf_attach_test, __n)(void) { return 0; } ^ ATTACH_TEST(16) ^ net/bpf/test_run.c:172:15: note: expanded from macro 'ATTACH_TEST' int noinline __PASTE(bpf_attach_test, __n)(void) { return 0; } ^ include/linux/compiler_types.h:60:22: note: expanded from macro '__PASTE' #define __PASTE(a,b) ___PASTE(a,b) ^ include/linux/compiler_types.h:59:23: note: expanded from macro '___PASTE' #define ___PASTE(a,b) a##b ^ <scratch space>:142:1: note: expanded from here bpf_attach_test16 ^ net/bpf/test_run.c:190:1: note: declare 'static' if the function is not intended to be used outside of this translation unit ATTACH_TEST(16) ^ static net/bpf/test_run.c:172:2: note: expanded from macro 'ATTACH_TEST' int noinline __PASTE(bpf_attach_test, __n)(void) { return 0; } ^ ATTACH_TEST(17) ^ net/bpf/test_run.c:172:15: note: expanded from macro 'ATTACH_TEST' int noinline __PASTE(bpf_attach_test, __n)(void) { return 0; } ^ include/linux/compiler_types.h:60:22: note: expanded from macro '__PASTE' #define __PASTE(a,b) ___PASTE(a,b) ^ include/linux/compiler_types.h:59:23: note: expanded from macro '___PASTE' #define ___PASTE(a,b) a##b ^ <scratch space>:143:1: note: expanded from here bpf_attach_test17 ^ net/bpf/test_run.c:191:1: note: declare 'static' if the function is not intended to be used outside of this translation unit ATTACH_TEST(17) ^ static net/bpf/test_run.c:172:2: note: expanded from macro 'ATTACH_TEST' int noinline __PASTE(bpf_attach_test, __n)(void) { return 0; } ^ ATTACH_TEST(18) ^ net/bpf/test_run.c:172:15: note: expanded from macro 'ATTACH_TEST' int noinline __PASTE(bpf_attach_test, __n)(void) { return 0; } ^ include/linux/compiler_types.h:60:22: note: expanded from macro '__PASTE' #define __PASTE(a,b) ___PASTE(a,b) ^ include/linux/compiler_types.h:59:23: note: expanded from macro '___PASTE' #define ___PASTE(a,b) a##b ^ <scratch space>:144:1: note: expanded from here bpf_attach_test18 ^ net/bpf/test_run.c:192:1: note: declare 'static' if the function is not intended to be used outside of this translation unit ATTACH_TEST(18) ^ static net/bpf/test_run.c:172:2: note: expanded from macro 'ATTACH_TEST' int noinline __PASTE(bpf_attach_test, __n)(void) { return 0; } ^ ATTACH_TEST(19) ^ net/bpf/test_run.c:172:15: note: expanded from macro 'ATTACH_TEST' int noinline __PASTE(bpf_attach_test, __n)(void) { return 0; } ^ include/linux/compiler_types.h:60:22: note: expanded from macro '__PASTE' #define __PASTE(a,b) ___PASTE(a,b) ^ include/linux/compiler_types.h:59:23: note: expanded from macro '___PASTE' #define ___PASTE(a,b) a##b ^ <scratch space>:145:1: note: expanded from here bpf_attach_test19 ^ net/bpf/test_run.c:193:1: note: declare 'static' if the function is not intended to be used outside of this translation unit ATTACH_TEST(19) ^ static net/bpf/test_run.c:172:2: note: expanded from macro 'ATTACH_TEST' int noinline __PASTE(bpf_attach_test, __n)(void) { return 0; } ^ net/bpf/test_run.c:194:1: warning: no previous prototype for function 'bpf_attach_test20' [-Wmissing-prototypes] ATTACH_TEST(20) ^ net/bpf/test_run.c:172:15: note: expanded from macro 'ATTACH_TEST' int noinline __PASTE(bpf_attach_test, __n)(void) { return 0; } ^ include/linux/compiler_types.h:60:22: note: expanded from macro '__PASTE' #define __PASTE(a,b) ___PASTE(a,b) ^ include/linux/compiler_types.h:59:23: note: expanded from macro '___PASTE' #define ___PASTE(a,b) a##b ^ <scratch space>:146:1: note: expanded from here bpf_attach_test20 ^ net/bpf/test_run.c:194:1: note: declare 'static' if the function is not intended to be used outside of this translation unit ATTACH_TEST(20) ^ static net/bpf/test_run.c:172:2: note: expanded from macro 'ATTACH_TEST' int noinline __PASTE(bpf_attach_test, __n)(void) { return 0; } ^ net/bpf/test_run.c:195:1: warning: no previous prototype for function 'bpf_attach_test21' [-Wmissing-prototypes] ATTACH_TEST(21) ^ net/bpf/test_run.c:172:15: note: expanded from macro 'ATTACH_TEST' int noinline __PASTE(bpf_attach_test, __n)(void) { return 0; } ^ include/linux/compiler_types.h:60:22: note: expanded from macro '__PASTE' #define __PASTE(a,b) ___PASTE(a,b) ^ include/linux/compiler_types.h:59:23: note: expanded from macro '___PASTE' #define ___PASTE(a,b) a##b ^ <scratch space>:147:1: note: expanded from here bpf_attach_test21 ^ net/bpf/test_run.c:195:1: note: declare 'static' if the function is not intended to be used outside of this translation unit ATTACH_TEST(21) ^ static net/bpf/test_run.c:172:2: note: expanded from macro 'ATTACH_TEST' int noinline __PASTE(bpf_attach_test, __n)(void) { return 0; } ^ net/bpf/test_run.c:196:1: warning: no previous prototype for function 'bpf_attach_test22' [-Wmissing-prototypes] ATTACH_TEST(22) ^ net/bpf/test_run.c:172:15: note: expanded from macro 'ATTACH_TEST' int noinline __PASTE(bpf_attach_test, __n)(void) { return 0; } ^ include/linux/compiler_types.h:60:22: note: expanded from macro '__PASTE' #define __PASTE(a,b) ___PASTE(a,b) ^ include/linux/compiler_types.h:59:23: note: expanded from macro '___PASTE' #define ___PASTE(a,b) a##b ^ <scratch space>:148:1: note: expanded from here bpf_attach_test22 ^ net/bpf/test_run.c:196:1: note: declare 'static' if the function is not intended to be used outside of this translation unit ATTACH_TEST(22) ^ static net/bpf/test_run.c:172:2: note: expanded from macro 'ATTACH_TEST' int noinline __PASTE(bpf_attach_test, __n)(void) { return 0; } ^ net/bpf/test_run.c:197:1: warning: no previous prototype for function 'bpf_attach_test23' [-Wmissing-prototypes] ATTACH_TEST(23) ^ net/bpf/test_run.c:172:15: note: expanded from macro 'ATTACH_TEST' int noinline __PASTE(bpf_attach_test, __n)(void) { return 0; } ^ include/linux/compiler_types.h:60:22: note: expanded from macro '__PASTE' #define __PASTE(a,b) ___PASTE(a,b) ^ include/linux/compiler_types.h:59:23: note: expanded from macro '___PASTE' #define ___PASTE(a,b) a##b ^ <scratch space>:149:1: note: expanded from here vim +/bpf_attach_test0 +174 net/bpf/test_run.c 170 171 #define ATTACH_TEST(__n) \ 172 int noinline __PASTE(bpf_attach_test, __n)(void) { return 0; } 173 224 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org