Hi Stanislav,

Thank you for the patch! Yet something to improve:

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

url:    https://github.com/0day-ci/linux/commits/Stanislav-Fomichev/bpf-support-BPF_PROG_QUERY-for-BPF_FLOW_DISSECTOR-attach_type/20190424-235216
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
config: sparc64-allnoconfig (attached as .config)
compiler: sparc64-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        GCC_VERSION=7.2.0 make.cross ARCH=sparc64 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@intel.com>
All errors (new ones prefixed by >>):

   In file included from include/net/net_namespace.h:37:0,
                    from include/linux/inet.h:46,
                    from include/linux/sunrpc/msg_prot.h:204,
                    from include/linux/sunrpc/auth.h:16,
                    from include/linux/nfs_fs.h:31,
                    from arch/sparc//kernel/sys_sparc32.c:25:
>> include/linux/skbuff.h:1268:12: error: 'skb_flow_dissector_prog_query' defined but not used [-Werror=unused-function]
    static int skb_flow_dissector_prog_query(const union bpf_attr *attr,
               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   cc1: all warnings being treated as errors

vim +/skb_flow_dissector_prog_query +1268 include/linux/skbuff.h

  1255	
  1256	void skb_flow_dissector_init(struct flow_dissector *flow_dissector,
  1257				     const struct flow_dissector_key *key,
  1258				     unsigned int key_count);
  1259	
  1260	#ifdef CONFIG_NET
  1261	int skb_flow_dissector_prog_query(const union bpf_attr *attr,
  1262					  union bpf_attr __user *uattr);
  1263	int skb_flow_dissector_bpf_prog_attach(const union bpf_attr *attr,
  1264					       struct bpf_prog *prog);
  1265	
  1266	int skb_flow_dissector_bpf_prog_detach(const union bpf_attr *attr);
  1267	#else
> 1268	static int skb_flow_dissector_prog_query(const union bpf_attr *attr,
  1269						 union bpf_attr __user *uattr)
  1270	{
  1271		return -EOPNOTSUPP;
  1272	}
  1273	

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