Re: [PATCH bpf-next 2/3] bpf: Add support for writing to nf_conn:mark

[kernel test robot]

Hi Daniel,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on bpf-next/master]

url:    https://github.com/intel-lab-lkp/linux/commits/Daniel-Xu/Support-direct-writes-to-nf_conn-mark/20220816-060429
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
config: um-x86_64_defconfig (https://download.01.org/0day-ci/archive/20220816/202208160931.5FG8tZ8G-lkp@xxxxxxxxx/config)
compiler: gcc-11 (Debian 11.3.0-5) 11.3.0
reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/c7b21d163eb9c61514dd86baf4281deb4d4387bb
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Daniel-Xu/Support-direct-writes-to-nf_conn-mark/20220816-060429
        git checkout c7b21d163eb9c61514dd86baf4281deb4d4387bb
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=um SUBARCH=x86_64 SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>):

   net/core/filter.c: In function 'tc_cls_act_btf_struct_access':
>> net/core/filter.c:8723:24: error: implicit declaration of function 'btf_struct_access' [-Werror=implicit-function-declaration]
    8723 |                 return btf_struct_access(log, btf, t, off, size, atype, next_btf_id,
         |                        ^~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors


vim +/btf_struct_access +8723 net/core/filter.c

  8714	
  8715	static int tc_cls_act_btf_struct_access(struct bpf_verifier_log *log,
  8716						const struct btf *btf,
  8717						const struct btf_type *t, int off,
  8718						int size, enum bpf_access_type atype,
  8719						u32 *next_btf_id,
  8720						enum bpf_type_flag *flag)
  8721	{
  8722		if (atype == BPF_READ)
> 8723			return btf_struct_access(log, btf, t, off, size, atype, next_btf_id,
  8724						 flag);
  8725	
  8726		return nf_conntrack_btf_struct_access(log, btf, t, off, size, atype,
  8727						      next_btf_id, flag);
  8728	}
  8729	

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