Hi Antonio,

kernel test robot noticed the following build warnings:

[auto build test WARNING on net-next/main]

url:    https://github.com/intel-lab-lkp/linux/commits/Antonio-Quartulli/netlink-add-NLA_POLICY_MAX_LEN-macro/20240304-232835
base:   net-next/main
patch link:    https://lore.kernel.org/r/20240304150914.11444-15-antonio%40openvpn.net
patch subject: [PATCH net-next v2 14/22] ovpn: implement peer lookup logic
config: sparc-randconfig-r051-20240309 (https://download.01.org/0day-ci/archive/20240309/202403091859.HD1Dnk2H-lkp@intel.com/config)
compiler: sparc-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240309/202403091859.HD1Dnk2H-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot [off-list ref]
| Closes: https://lore.kernel.org/oe-kbuild-all/202403091859.HD1Dnk2H-lkp@intel.com/ (local)

All warnings (new ones prefixed by >>):

   drivers/net/ovpn/peer.c: In function 'ovpn_nexthop_from_rt6':
   drivers/net/ovpn/peer.c:170:24: error: invalid use of undefined type 'struct rt6_info'
     170 |         if (!rt || !(rt->rt6i_flags & RTF_GATEWAY))
         |                        ^~
   drivers/net/ovpn/peer.c:173:18: error: invalid use of undefined type 'struct rt6_info'
     173 |         return rt->rt6i_gateway;
         |                  ^~

quoted

drivers/net/ovpn/peer.c:174:1: warning: control reaches end of non-void function [-Wreturn-type]

     174 | }
         | ^


vim +174 drivers/net/ovpn/peer.c

   165	
   166	static struct in6_addr ovpn_nexthop_from_rt6(struct sk_buff *skb)
   167	{
   168		struct rt6_info *rt = (struct rt6_info *)skb_rtable(skb);
   169	
 > 170		if (!rt || !(rt->rt6i_flags & RTF_GATEWAY))
   171			return ipv6_hdr(skb)->daddr;
   172	
   173		return rt->rt6i_gateway;
 > 174	}
   175	

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https://github.com/intel/lkp-tests/wiki