[nf-next:for-net-next3 35/40] net/netfilter/utils.c:37: undefined reference to `nf_ip6_checksum_partial'

[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: 1033afac404a403b3ae982702061e7808b80e597 [35/40] netfilter: remove checksum_partial 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 1033afac404a403b3ae982702061e7808b80e597
        # 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'
   net/netfilter/utils.o: In function `nf_checksum_partial':
>> net/netfilter/utils.c:37: undefined reference to `nf_ip6_checksum_partial'

vim +37 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);
    18			break;
    19		}
    20	
    21		return csum;
    22	}
    23	EXPORT_SYMBOL_GPL(nf_checksum);
    24	
    25	__sum16 nf_checksum_partial(struct sk_buff *skb, unsigned int hook,
    26				    unsigned int dataoff, unsigned int len,
    27				    u_int8_t protocol, unsigned short family)
    28	{
    29		__sum16 csum = 0;
    30	
    31		switch (family) {
    32		case AF_INET:
    33			csum = nf_ip_checksum_partial(skb, hook, dataoff, len,
    34						      protocol);
    35			break;
    36		case AF_INET6:
  > 37			csum = nf_ip6_checksum_partial(skb, hook, dataoff, len,

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