linux-kernel - [jolsa-perf:bpf/batch 13/29] kernel/bpf/core.c:2287:3: error: implicit declaration of function 'bpf_tramp

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Message-ID: <202111182238.aVZr0g8U-lkp@intel.com>
Date:   Thu, 18 Nov 2021 22:08:46 +0800
From:   kernel test robot <lkp@...el.com>
To:     Jiri Olsa <jolsa@...nel.org>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: [jolsa-perf:bpf/batch 13/29] kernel/bpf/core.c:2287:3: error:
 implicit declaration of function 'bpf_tramp_detach'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git bpf/batch
head:   5f1f613266bf58f8424a93e1f8b99c4ac8fa6c2b
commit: c04eb2ad90ed0981f4dc7d04249a9c84726f9ef0 [13/29] bpf: Add bpf_tramp_attach layer for trampoline attachment
config: um-i386_defconfig (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git/commit/?id=c04eb2ad90ed0981f4dc7d04249a9c84726f9ef0
        git remote add jolsa-perf https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git
        git fetch --no-tags jolsa-perf bpf/batch
        git checkout c04eb2ad90ed0981f4dc7d04249a9c84726f9ef0
        # save the attached .config to linux build tree
        make W=1 ARCH=um SUBARCH=i386

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All errors (new ones prefixed by >>):

   kernel/bpf/core.c:1368:12: warning: no previous prototype for 'bpf_probe_read_kernel' [-Wmissing-prototypes]
    1368 | u64 __weak bpf_probe_read_kernel(void *dst, u32 size, const void *unsafe_ptr)
         |            ^~~~~~~~~~~~~~~~~~~~~
   kernel/bpf/core.c:1811:6: warning: no previous prototype for 'bpf_patch_call_args' [-Wmissing-prototypes]
    1811 | void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth)
         |      ^~~~~~~~~~~~~~~~~~~
   kernel/bpf/core.c: In function 'bpf_prog_free_deferred':
>> kernel/bpf/core.c:2287:3: error: implicit declaration of function 'bpf_tramp_detach' [-Werror=implicit-function-declaration]
    2287 |   bpf_tramp_detach(aux->dst_attach);
         |   ^~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors


vim +/bpf_tramp_detach +2287 kernel/bpf/core.c

  2268	
  2269	static void bpf_prog_free_deferred(struct work_struct *work)
  2270	{
  2271		struct bpf_prog_aux *aux;
  2272		int i;
  2273	
  2274		aux = container_of(work, struct bpf_prog_aux, work);
  2275	#ifdef CONFIG_BPF_SYSCALL
  2276		bpf_free_kfunc_btf_tab(aux->kfunc_btf_tab);
  2277	#endif
  2278		bpf_free_used_maps(aux);
  2279		bpf_free_used_btfs(aux);
  2280		if (bpf_prog_is_dev_bound(aux))
  2281			bpf_prog_offload_destroy(aux->prog);
  2282	#ifdef CONFIG_PERF_EVENTS
  2283		if (aux->prog->has_callchain_buf)
  2284			put_callchain_buffers();
  2285	#endif
  2286		if (aux->dst_attach)
> 2287			bpf_tramp_detach(aux->dst_attach);
  2288		for (i = 0; i < aux->func_cnt; i++) {
  2289			/* We can just unlink the subprog poke descriptor table as
  2290			 * it was originally linked to the main program and is also
  2291			 * released along with it.
  2292			 */
  2293			aux->func[i]->aux->poke_tab = NULL;
  2294			bpf_jit_free(aux->func[i]);
  2295		}
  2296		if (aux->func_cnt) {
  2297			kfree(aux->func);
  2298			bpf_prog_unlock_free(aux->prog);
  2299		} else {
  2300			bpf_jit_free(aux->prog);
  2301		}
  2302	}
  2303	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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