* Re: [PATCHv3 bpf-next 08/24] bpf: Add bpf_trampoline_multi_attach/detach functions
[not found] <20260316075138.465430-9-jolsa@kernel.org>
@ 2026-03-20 10:18 ` kernel test robot
0 siblings, 0 replies; only message in thread
From: kernel test robot @ 2026-03-20 10:18 UTC (permalink / raw)
To: Jiri Olsa, Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko
Cc: llvm, oe-kbuild-all, bpf, linux-trace-kernel, Martin KaFai Lau,
Eduard Zingerman, Song Liu, Yonghong Song, Menglong Dong,
Steven Rostedt
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/20260320/202603201820.zsM5FRDS-lkp@intel.com/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/20260320/202603201820.zsM5FRDS-lkp@intel.com/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 <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202603201820.zsM5FRDS-lkp@intel.com/
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
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