[nf-next:for-net-next4 37/40] net/netfilter/utils.c:60: undefined reference to `nf_ip_route'

[kbuild test robot <fengguang.wu@xxxxxxxxx>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next.git for-net-next4
head:   9b68071a2526dae4aeae359916ce31698a64599f
commit: 6c23627f164a73658e5d7d5032025e459bd0a485 [37/40] netfilter: move route indirection to struct nf_ipv6_ops
config: i386-randconfig-a1-201752 (attached as .config)
compiler: gcc-4.9 (Debian 4.9.4-2) 4.9.4
reproduce:
        git checkout 6c23627f164a73658e5d7d5032025e459bd0a485
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   net/netfilter/utils.o: In function `nf_checksum':
   net/netfilter/utils.c:15: undefined reference to `nf_ip_checksum'
   net/netfilter/utils.o: In function `nf_checksum_partial':
   net/netfilter/utils.c:37: undefined reference to `nf_ip_checksum_partial'
   net/netfilter/utils.o: In function `nf_route':
>> net/netfilter/utils.c:60: undefined reference to `nf_ip_route'

vim +60 net/netfilter/utils.c

     5	
     6	__sum16 nf_checksum(struct sk_buff *skb, unsigned int hook,
     7			    unsigned int dataoff, u_int8_t protocol,
     8			    unsigned short family)
     9	{
    10		const struct nf_ipv6_ops *v6ops;
    11		__sum16 csum = 0;
    12	
    13		switch (family) {
    14		case AF_INET:
  > 15			csum = nf_ip_checksum(skb, hook, dataoff, protocol);
    16			break;
    17		case AF_INET6:
    18			v6ops = rcu_dereference(nf_ipv6_ops);
    19			if (v6ops)
    20				csum = v6ops->checksum(skb, hook, dataoff, protocol);
    21			break;
    22		}
    23	
    24		return csum;
    25	}
    26	EXPORT_SYMBOL_GPL(nf_checksum);
    27	
    28	__sum16 nf_checksum_partial(struct sk_buff *skb, unsigned int hook,
    29				    unsigned int dataoff, unsigned int len,
    30				    u_int8_t protocol, unsigned short family)
    31	{
    32		const struct nf_ipv6_ops *v6ops;
    33		__sum16 csum = 0;
    34	
    35		switch (family) {
    36		case AF_INET:
    37			csum = nf_ip_checksum_partial(skb, hook, dataoff, len,
    38						      protocol);
    39			break;
    40		case AF_INET6:
    41			v6ops = rcu_dereference(nf_ipv6_ops);
    42			if (v6ops)
    43				csum = v6ops->checksum_partial(skb, hook, dataoff, len,
    44							       protocol);
    45			break;
    46		}
    47	
    48		return csum;
    49	}
    50	EXPORT_SYMBOL_GPL(nf_checksum_partial);
    51	
    52	int nf_route(struct net *net, struct dst_entry **dst, struct flowi *fl,
    53		     bool strict, unsigned short family)
    54	{
    55		const struct nf_ipv6_ops *v6ops;
    56		int ret = 0;
    57	
    58		switch (family) {
    59		case AF_INET:
  > 60			ret = nf_ip_route(net, dst, fl, strict);

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