Hi,

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

url:    https://github.com/0day-ci/linux/commits/Martin-KaFai-Lau/cgroup-Add-cgroup_get_from_fd/20160623-052247
config: x86_64-lkp (attached as .config)
compiler: gcc-4.9 (Debian 4.9.3-14) 4.9.3
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   net/core/filter.c: In function 'bpf_skb_in_cgroup':
>> net/core/filter.c:2050:2: error: implicit declaration of function 'sock_cgroup_ptr' [-Werror=implicit-function-declaration]
     return cgroup_is_descendant(sock_cgroup_ptr(&sk->sk_cgrp_data), cgrp);
     ^
   net/core/filter.c:2050:30: warning: passing argument 1 of 'cgroup_is_descendant' makes pointer from integer without a cast
     return cgroup_is_descendant(sock_cgroup_ptr(&sk->sk_cgrp_data), cgrp);
                                 ^
   In file included from include/net/netprio_cgroup.h:17:0,
                    from include/linux/netdevice.h:48,
                    from net/core/filter.c:31:
   include/linux/cgroup.h:492:20: note: expected 'struct cgroup *' but argument is of type 'int'
    static inline bool cgroup_is_descendant(struct cgroup *cgrp,
                       ^
   cc1: some warnings being treated as errors

vim +/sock_cgroup_ptr +2050 net/core/filter.c

  2044			return -E2BIG;
  2045	
  2046		cgrp = READ_ONCE(array->ptrs[i]);
  2047		if (unlikely(!cgrp))
  2048			return -ENOENT;
  2049	
> 2050		return cgroup_is_descendant(sock_cgroup_ptr(&sk->sk_cgrp_data), cgrp);
  2051	}
  2052	
  2053	static const struct bpf_func_proto bpf_skb_in_cgroup_proto = {

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