Hi Lorenz,

I love your patch! Yet something to improve:

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

url:    https://github.com/0day-ci/linux/commits/Lorenz-Bauer/Sockmap-copying/20200925-175852
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
config: arm-randconfig-r023-20200925 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project c32e69b2ce7abfb151a87ba363ac9e25abf7d417)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install arm cross compiling tool for clang build
        # apt-get install binutils-arm-linux-gnueabi
        # https://github.com/0day-ci/linux/commit/8021d25b95546c5e69261c6083c6eed8909caffd
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Lorenz-Bauer/Sockmap-copying/20200925-175852
        git checkout 8021d25b95546c5e69261c6083c6eed8909caffd
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm 

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

All errors (new ones prefixed by >>):

>> kernel/bpf/verifier.c:3941:16: error: use of undeclared identifier 'ARG_PTR_TO_BTF_ID_SOCK_COMMON'; did you mean 'ARG_PTR_TO_SOCK_COMMON'?
                           *arg_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON;
                                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                                       ARG_PTR_TO_SOCK_COMMON
   include/linux/bpf.h:286:2: note: 'ARG_PTR_TO_SOCK_COMMON' declared here
           ARG_PTR_TO_SOCK_COMMON, /* pointer to sock_common */
           ^
   1 error generated.

vim +3941 kernel/bpf/verifier.c

  3926	
  3927	static int resolve_map_arg_type(struct bpf_verifier_env *env,
  3928					 const struct bpf_call_arg_meta *meta,
  3929					 enum bpf_arg_type *arg_type)
  3930	{
  3931		if (!meta->map_ptr) {
  3932			/* kernel subsystem misconfigured verifier */
  3933			verbose(env, "invalid map_ptr to access map->type\n");
  3934			return -EACCES;
  3935		}
  3936	
  3937		switch (meta->map_ptr->map_type) {
  3938		case BPF_MAP_TYPE_SOCKMAP:
  3939		case BPF_MAP_TYPE_SOCKHASH:
  3940			if (*arg_type == ARG_PTR_TO_MAP_VALUE) {
> 3941				*arg_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON;
  3942			} else {
  3943				verbose(env, "invalid arg_type for sockmap/sockhash\n");
  3944				return -EINVAL;
  3945			}
  3946			break;
  3947	
  3948		default:
  3949			break;
  3950		}
  3951		return 0;
  3952	}
  3953	

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