include/net/ip6_route.h:88: undefined reference to `ip6_route_output_flags'

[kbuild test robot]

Hi Alin,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 
master
head:   12ad143e1b803e541e48b8ba40f550250259ecdd
commit: a3419ce3356cf1fdc69a0524eced84cef730b3bf netfilter: nf_conntrack_sip: 
add sip_external_media logic
date:   3 weeks ago
config: x86_64-randconfig-m3-201910 (attached as .config)
compiler: gcc-7 (Debian 7.4.0-6) 7.4.0
reproduce:
        git checkout a3419ce3356cf1fdc69a0524eced84cef730b3bf
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   ld: net/netfilter/nf_conntrack_sip.o: in function `ip6_route_output':
>> include/net/ip6_route.h:88: undefined reference to `ip6_route_output_flags'

vim +88 include/net/ip6_route.h

33bd5ac5 David Ahern     2018-07-03  74  
5c3a0fd7 Joe Perches     2013-09-21  75  void ip6_route_input(struct sk_buff 
*skb);
d409b847 Mahesh Bandewar 2016-09-16  76  struct dst_entry 
*ip6_route_input_lookup(struct net *net,
d409b847 Mahesh Bandewar 2016-09-16  77                                         
 struct net_device *dev,
b75cc8f9 David Ahern     2018-03-02  78                                         
 struct flowi6 *fl6,
b75cc8f9 David Ahern     2018-03-02  79                                         
 const struct sk_buff *skb, int flags);
^1da177e Linus Torvalds  2005-04-16  80  
6f21c96a Paolo Abeni     2016-01-29  81  struct dst_entry 
*ip6_route_output_flags(struct net *net, const struct sock *sk,
6f21c96a Paolo Abeni     2016-01-29  82                                         
 struct flowi6 *fl6, int flags);
6f21c96a Paolo Abeni     2016-01-29  83  
6f21c96a Paolo Abeni     2016-01-29  84  static inline struct dst_entry 
*ip6_route_output(struct net *net,
6f21c96a Paolo Abeni     2016-01-29  85                                         
         const struct sock *sk,
6f21c96a Paolo Abeni     2016-01-29  86                                         
         struct flowi6 *fl6)
6f21c96a Paolo Abeni     2016-01-29  87  {
6f21c96a Paolo Abeni     2016-01-29 @88         return 
ip6_route_output_flags(net, sk, fl6, 0);
6f21c96a Paolo Abeni     2016-01-29  89  }
6f21c96a Paolo Abeni     2016-01-29  90  

:::::: The code at line 88 was first introduced by commit
:::::: 6f21c96a78b835259546d8f3fb4edff0f651d478 ipv6: enforce flowi6_oif usage 
in ip6_dst_lookup_tail()

:::::: TO: Paolo Abeni <pab...@redhat.com>
:::::: CC: David S. Miller <da...@davemloft.net>

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