[nf-next:for-net-next3 34/40] net/netfilter/utils.c:17: undefined reference to `nf_ip6_checksum'

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next.git for-net-next3
head:   dfbb1c16489ca1b93e3f8aebc74d9229f1d87cc6
commit: 188efacae54f7b9f1421a238da93d5289a3704a0 [34/40] netfilter: remove checksum indirection in struct nf_afinfo
config: x86_64-randconfig-s2-12200210 (attached as .config)
compiler: gcc-6 (Debian 6.4.0-9) 6.4.0 20171026
reproduce:
        git checkout 188efacae54f7b9f1421a238da93d5289a3704a0
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   net/netfilter/utils.o: In function `nf_checksum':
>> net/netfilter/utils.c:17: undefined reference to `nf_ip6_checksum'

vim +17 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		__sum16 csum = 0;
    11	
    12		switch (family) {
    13		case AF_INET:
    14			csum = nf_ip_checksum(skb, hook, dataoff, protocol);
    15			break;
    16		case AF_INET6:
  > 17			csum = nf_ip6_checksum(skb, hook, dataoff, protocol);

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