* [akpm-mm:mm-nonmm-unstable 77/129] arch/loongarch/net/bpf_jit.c:1322:7: error: call to undeclared function '__bpf_address_lookup'; ISO C99 and later do not support implicit function declarations
@ 2026-01-13 17:37 kernel test robot
2026-01-13 17:48 ` Andrew Morton
0 siblings, 1 reply; 2+ messages in thread
From: kernel test robot @ 2026-01-13 17:37 UTC (permalink / raw)
To: Petr Mladek
Cc: llvm, oe-kbuild-all, David Hildenbrand, Andrew Morton,
Linux Memory Management List
tree: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-nonmm-unstable
head: 01c8de771f4a779caac5d841b1cb2207ac23330a
commit: 0f1766dc93f077061bf42cc6222bb2ade96422a4 [77/129] kallsyms/bpf: rename __bpf_address_lookup() to bpf_address_lookup()
config: loongarch-allmodconfig (https://download.01.org/0day-ci/archive/20260114/202601140159.I4b0kwpE-lkp@intel.com/config)
compiler: clang version 19.1.7 (https://github.com/llvm/llvm-project cd708029e0b2869e80abe31ddb175f7c35361f90)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260114/202601140159.I4b0kwpE-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/202601140159.I4b0kwpE-lkp@intel.com/
All errors (new ones prefixed by >>):
>> arch/loongarch/net/bpf_jit.c:1322:7: error: call to undeclared function '__bpf_address_lookup'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
1322 | if (!__bpf_address_lookup((unsigned long)ip, &size, &offset, namebuf))
| ^
arch/loongarch/net/bpf_jit.c:1322:7: note: did you mean 'bpf_address_lookup'?
include/linux/filter.h:1378:5: note: 'bpf_address_lookup' declared here
1378 | int bpf_address_lookup(unsigned long addr, unsigned long *size,
| ^
1 error generated.
vim +/__bpf_address_lookup +1322 arch/loongarch/net/bpf_jit.c
9fbd18cf4c69f51 Chenghao Duan 2025-08-05 1305
ae4a3160d19cd16 Menglong Dong 2025-11-18 1306 int bpf_arch_text_poke(void *ip, enum bpf_text_poke_type old_t,
ae4a3160d19cd16 Menglong Dong 2025-11-18 1307 enum bpf_text_poke_type new_t, void *old_addr,
ae4a3160d19cd16 Menglong Dong 2025-11-18 1308 void *new_addr)
9fbd18cf4c69f51 Chenghao Duan 2025-08-05 1309 {
9fbd18cf4c69f51 Chenghao Duan 2025-08-05 1310 int ret;
ae4a3160d19cd16 Menglong Dong 2025-11-18 1311 bool is_call;
73721d8676771c6 Chenghao Duan 2025-12-31 1312 unsigned long size = 0;
73721d8676771c6 Chenghao Duan 2025-12-31 1313 unsigned long offset = 0;
73721d8676771c6 Chenghao Duan 2025-12-31 1314 void *image = NULL;
73721d8676771c6 Chenghao Duan 2025-12-31 1315 char namebuf[KSYM_NAME_LEN];
9fbd18cf4c69f51 Chenghao Duan 2025-08-05 1316 u32 old_insns[LOONGARCH_LONG_JUMP_NINSNS] = {[0 ... 4] = INSN_NOP};
9fbd18cf4c69f51 Chenghao Duan 2025-08-05 1317 u32 new_insns[LOONGARCH_LONG_JUMP_NINSNS] = {[0 ... 4] = INSN_NOP};
9fbd18cf4c69f51 Chenghao Duan 2025-08-05 1318
3d770bd11b94306 Hengqi Chen 2025-10-02 1319 /* Only poking bpf text is supported. Since kernel function entry
3d770bd11b94306 Hengqi Chen 2025-10-02 1320 * is set up by ftrace, we rely on ftrace to poke kernel functions.
3d770bd11b94306 Hengqi Chen 2025-10-02 1321 */
73721d8676771c6 Chenghao Duan 2025-12-31 @1322 if (!__bpf_address_lookup((unsigned long)ip, &size, &offset, namebuf))
9fbd18cf4c69f51 Chenghao Duan 2025-08-05 1323 return -ENOTSUPP;
9fbd18cf4c69f51 Chenghao Duan 2025-08-05 1324
73721d8676771c6 Chenghao Duan 2025-12-31 1325 image = ip - offset;
73721d8676771c6 Chenghao Duan 2025-12-31 1326
73721d8676771c6 Chenghao Duan 2025-12-31 1327 /* zero offset means we're poking bpf prog entry */
73721d8676771c6 Chenghao Duan 2025-12-31 1328 if (offset == 0) {
73721d8676771c6 Chenghao Duan 2025-12-31 1329 /* skip to the nop instruction in bpf prog entry:
73721d8676771c6 Chenghao Duan 2025-12-31 1330 * move t0, ra
73721d8676771c6 Chenghao Duan 2025-12-31 1331 * nop
73721d8676771c6 Chenghao Duan 2025-12-31 1332 */
73721d8676771c6 Chenghao Duan 2025-12-31 1333 ip = image + LOONGARCH_INSN_SIZE;
73721d8676771c6 Chenghao Duan 2025-12-31 1334 }
73721d8676771c6 Chenghao Duan 2025-12-31 1335
ae4a3160d19cd16 Menglong Dong 2025-11-18 1336 is_call = old_t == BPF_MOD_CALL;
9fbd18cf4c69f51 Chenghao Duan 2025-08-05 1337 ret = emit_jump_or_nops(old_addr, ip, old_insns, is_call);
9fbd18cf4c69f51 Chenghao Duan 2025-08-05 1338 if (ret)
9fbd18cf4c69f51 Chenghao Duan 2025-08-05 1339 return ret;
9fbd18cf4c69f51 Chenghao Duan 2025-08-05 1340
9fbd18cf4c69f51 Chenghao Duan 2025-08-05 1341 if (memcmp(ip, old_insns, LOONGARCH_LONG_JUMP_NBYTES))
9fbd18cf4c69f51 Chenghao Duan 2025-08-05 1342 return -EFAULT;
9fbd18cf4c69f51 Chenghao Duan 2025-08-05 1343
ae4a3160d19cd16 Menglong Dong 2025-11-18 1344 is_call = new_t == BPF_MOD_CALL;
9fbd18cf4c69f51 Chenghao Duan 2025-08-05 1345 ret = emit_jump_or_nops(new_addr, ip, new_insns, is_call);
9fbd18cf4c69f51 Chenghao Duan 2025-08-05 1346 if (ret)
9fbd18cf4c69f51 Chenghao Duan 2025-08-05 1347 return ret;
9fbd18cf4c69f51 Chenghao Duan 2025-08-05 1348
9fbd18cf4c69f51 Chenghao Duan 2025-08-05 1349 mutex_lock(&text_mutex);
9fbd18cf4c69f51 Chenghao Duan 2025-08-05 1350 if (memcmp(ip, new_insns, LOONGARCH_LONG_JUMP_NBYTES))
9fbd18cf4c69f51 Chenghao Duan 2025-08-05 1351 ret = larch_insn_text_copy(ip, new_insns, LOONGARCH_LONG_JUMP_NBYTES);
9fbd18cf4c69f51 Chenghao Duan 2025-08-05 1352 mutex_unlock(&text_mutex);
9fbd18cf4c69f51 Chenghao Duan 2025-08-05 1353
9fbd18cf4c69f51 Chenghao Duan 2025-08-05 1354 return ret;
9fbd18cf4c69f51 Chenghao Duan 2025-08-05 1355 }
9fbd18cf4c69f51 Chenghao Duan 2025-08-05 1356
:::::: The code at line 1322 was first introduced by commit
:::::: 73721d8676771c6c7b06d4e636cc053fc76afefd LoongArch: BPF: Enhance the bpf_arch_text_poke() function
:::::: TO: Chenghao Duan <duanchenghao@kylinos.cn>
:::::: CC: Huacai Chen <chenhuacai@loongson.cn>
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [akpm-mm:mm-nonmm-unstable 77/129] arch/loongarch/net/bpf_jit.c:1322:7: error: call to undeclared function '__bpf_address_lookup'; ISO C99 and later do not support implicit function declarations
2026-01-13 17:37 [akpm-mm:mm-nonmm-unstable 77/129] arch/loongarch/net/bpf_jit.c:1322:7: error: call to undeclared function '__bpf_address_lookup'; ISO C99 and later do not support implicit function declarations kernel test robot
@ 2026-01-13 17:48 ` Andrew Morton
0 siblings, 0 replies; 2+ messages in thread
From: Andrew Morton @ 2026-01-13 17:48 UTC (permalink / raw)
To: kernel test robot
Cc: Petr Mladek, llvm, oe-kbuild-all, David Hildenbrand,
Linux Memory Management List
On Wed, 14 Jan 2026 01:37:38 +0800 kernel test robot <lkp@intel.com> wrote:
> tree: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-nonmm-unstable
> head: 01c8de771f4a779caac5d841b1cb2207ac23330a
> commit: 0f1766dc93f077061bf42cc6222bb2ade96422a4 [77/129] kallsyms/bpf: rename __bpf_address_lookup() to bpf_address_lookup()
> config: loongarch-allmodconfig (https://download.01.org/0day-ci/archive/20260114/202601140159.I4b0kwpE-lkp@intel.com/config)
> compiler: clang version 19.1.7 (https://github.com/llvm/llvm-project cd708029e0b2869e80abe31ddb175f7c35361f90)
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260114/202601140159.I4b0kwpE-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/202601140159.I4b0kwpE-lkp@intel.com/
>
> All errors (new ones prefixed by >>):
>
> >> arch/loongarch/net/bpf_jit.c:1322:7: error: call to undeclared function '__bpf_address_lookup'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
> 1322 | if (!__bpf_address_lookup((unsigned long)ip, &size, &offset, namebuf))
> | ^
> arch/loongarch/net/bpf_jit.c:1322:7: note: did you mean 'bpf_address_lookup'?
> include/linux/filter.h:1378:5: note: 'bpf_address_lookup' declared here
> 1378 | int bpf_address_lookup(unsigned long addr, unsigned long *size,
> | ^
> 1 error generated.
Thanks. Presumably this:
--- a/arch/loongarch/net/bpf_jit.c~kallsyms-bpf-rename-__bpf_address_lookup-to-bpf_address_lookup-fix
+++ a/arch/loongarch/net/bpf_jit.c
@@ -1319,7 +1319,7 @@ int bpf_arch_text_poke(void *ip, enum bp
/* Only poking bpf text is supported. Since kernel function entry
* is set up by ftrace, we rely on ftrace to poke kernel functions.
*/
- if (!__bpf_address_lookup((unsigned long)ip, &size, &offset, namebuf))
+ if (!bpf_address_lookup((unsigned long)ip, &size, &offset, namebuf))
return -ENOTSUPP;
image = ip - offset;
_
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2026-01-13 17:37 [akpm-mm:mm-nonmm-unstable 77/129] arch/loongarch/net/bpf_jit.c:1322:7: error: call to undeclared function '__bpf_address_lookup'; ISO C99 and later do not support implicit function declarations kernel test robot
2026-01-13 17:48 ` Andrew Morton
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