Hi Jiri, kernel test robot noticed the following build errors:
[auto build test ERROR on bpf-next/master] url: https://github.com/intel-lab-lkp/linux/commits/Jiri-Olsa/ftrace-Add-ftrace_hash_count-function/20260316-160117 base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master patch link: https://lore.kernel.org/r/20260316075138.465430-9-jolsa%40kernel.org patch subject: [PATCHv3 bpf-next 08/24] bpf: Add bpf_trampoline_multi_attach/detach functions config: x86_64-randconfig-075-20260320 (https://download.01.org/0day-ci/archive/20260320/[email protected]/config) compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261) rustc: rustc 1.88.0 (6b00bc388 2025-06-23) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260320/[email protected]/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <[email protected]> | Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/ All errors (new ones prefixed by >>): >> kernel/bpf/trampoline.c:1520:8: error: call to undeclared function >> 'btf_distill_func_proto'; ISO C99 and later do not support implicit function >> declarations [-Wimplicit-function-declaration] 1520 | err = btf_distill_func_proto(NULL, btf, t, tname, &tgt_info->fmodel); | ^ 1 error generated. vim +/btf_distill_func_proto +1520 kernel/bpf/trampoline.c 1498 1499 static int bpf_get_btf_id_target(struct btf *btf, struct bpf_prog *prog, u32 btf_id, 1500 struct bpf_attach_target_info *tgt_info) 1501 { 1502 const struct btf_type *t; 1503 unsigned long addr; 1504 const char *tname; 1505 int err; 1506 1507 if (!btf_id || !btf) 1508 return -EINVAL; 1509 t = btf_type_by_id(btf, btf_id); 1510 if (!t) 1511 return -EINVAL; 1512 tname = btf_name_by_offset(btf, t->name_off); 1513 if (!tname) 1514 return -EINVAL; 1515 if (!btf_type_is_func(t)) 1516 return -EINVAL; 1517 t = btf_type_by_id(btf, t->type); 1518 if (!btf_type_is_func_proto(t)) 1519 return -EINVAL; > 1520 err = btf_distill_func_proto(NULL, btf, t, tname, > &tgt_info->fmodel); 1521 if (err < 0) 1522 return err; 1523 if (btf_is_module(btf)) { 1524 /* The bpf program already holds refference to module. */ 1525 if (WARN_ON_ONCE(!prog->aux->mod)) 1526 return -EINVAL; 1527 addr = find_kallsyms_symbol_value(prog->aux->mod, tname); 1528 } else { 1529 addr = kallsyms_lookup_name(tname); 1530 } 1531 if (!addr || !ftrace_location(addr)) 1532 return -ENOENT; 1533 tgt_info->tgt_addr = addr; 1534 return 0; 1535 } 1536 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
