Hi Usama, [FYI, it's a private test report for your RFC patch.] [auto build test WARNING on bpf-next/master] url: https://github.com/0day-ci/linux/commits/Usama-Arif/bpf-Introduce-module-... base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master config: x86_64-randconfig-a004-20220117 (https://download.01.org/0day-ci/archive/20220122/202201220628.8IcADV9U-lk...) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 7b3d30728816403d1fd73cc5082e9fb761262bce) 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/0day-ci/linux/commit/ca60b90025819a8a03818e86e2105bd15... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Usama-Arif/bpf-Introduce-module-helper-functions/20220122-034203 git checkout ca60b90025819a8a03818e86e2105bd15576d134 # 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 SHELL=/bin/bash net/bpf/ 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 >>): In file included from net/bpf/test_run.c:5: int register_mod_helper(struct btf_mod_helper *mod_helper) ^ include/linux/btf.h:391:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int register_mod_helper(struct btf_mod_helper *mod_helper) ^ static int unregister_mod_helper(struct btf_mod_helper *mod_helper) ^ include/linux/btf.h:395:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int unregister_mod_helper(struct btf_mod_helper *mod_helper) ^ static const struct bpf_func_proto *get_mod_helper_proto(const struct btf *btf, ^ include/linux/btf.h:399:7: note: declare 'static' if the function is not intended to be used outside of this translation unit const struct bpf_func_proto *get_mod_helper_proto(const struct btf *btf, ^ static net/bpf/test_run.c:171:14: warning: no previous prototype for function 'bpf_fentry_test1' [-Wmissing-prototypes] int noinline bpf_fentry_test1(int a) ^ net/bpf/test_run.c:171:1: 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:178:14: 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:178:1: 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:183:14: 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:183:1: 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:188:14: 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:188:1: 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:193:14: 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:193:1: 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:198:14: 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:198:1: 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:207:14: 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:207:1: 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:212:14: 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:212:1: 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:217:14: 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:217:1: 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 net/bpf/test_run.c:223:14: warning: no previous prototype for function 'bpf_kfunc_call_test1' [-Wmissing-prototypes] u64 noinline bpf_kfunc_call_test1(struct sock *sk, u32 a, u64 b, u32 c, u64 d) ^ net/bpf/test_run.c:223:1: note: declare 'static' if the function is not intended to be used outside of this translation unit u64 noinline bpf_kfunc_call_test1(struct sock *sk, u32 a, u64 b, u32 c, u64 d) ^ static net/bpf/test_run.c:228:14: warning: no previous prototype for function 'bpf_kfunc_call_test2' [-Wmissing-prototypes] int noinline bpf_kfunc_call_test2(struct sock *sk, u32 a, u32 b) ^ net/bpf/test_run.c:228:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int noinline bpf_kfunc_call_test2(struct sock *sk, u32 a, u32 b) ^ static net/bpf/test_run.c:233:24: warning: no previous prototype for function 'bpf_kfunc_call_test3' [-Wmissing-prototypes] struct sock * noinline bpf_kfunc_call_test3(struct sock *sk) ^ net/bpf/test_run.c:233:1: note: declare 'static' if the function is not intended to be used outside of this translation unit struct sock * noinline bpf_kfunc_call_test3(struct sock *sk) ^ static net/bpf/test_run.c:251:1: warning: no previous prototype for function 'bpf_kfunc_call_test_acquire' [-Wmissing-prototypes] bpf_kfunc_call_test_acquire(unsigned long *scalar_ptr) ^ net/bpf/test_run.c:250:10: note: declare 'static' if the function is not intended to be used outside of this translation unit noinline struct prog_test_ref_kfunc * ^ static net/bpf/test_run.c:259:15: warning: no previous prototype for function 'bpf_kfunc_call_test_release' [-Wmissing-prototypes] noinline void bpf_kfunc_call_test_release(struct prog_test_ref_kfunc *p) ^ vim +/register_mod_helper +391 include/linux/btf.h 373 374 #ifdef CONFIG_DEBUG_INFO_BTF_MODULES 375 int register_mod_helper(struct btf_mod_helper *mod_helper); 376 int unregister_mod_helper(struct btf_mod_helper *mod_helper); 377 const struct bpf_func_proto *get_mod_helper_proto(const struct btf *btf, 378 const u32 kfunc_btf_id); 379 380 #define DEFINE_MOD_HELPER(mod_helper, owner, helper_func, func_proto) \ 381 BTF_SET_START(helper_func##__id_set) \ 382 BTF_ID(func, helper_func) \ 383 BTF_SET_END(helper_func##__id_set) \ 384 struct btf_mod_helper mod_helper = { \ 385 LIST_HEAD_INIT(mod_helper.list), \ 386 (owner), \ 387 (&(helper_func##__id_set)), \ 388 (&(func_proto)) \ 389 } 390 #else 392 { 393 return -EPERM; 394 } 396 { 397 return -EPERM; 398 } 400 const u32 kfunc_btf_id) 401 { 402 return NULL; 403 } 404 #endif 405 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org