netdev - [net-next:master 194/208] include/net/dst_metadata.h:39:4: error: implicit declaration of function 'lwt_tun

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Date:	Wed, 22 Jul 2015 07:35:18 +0800
From:	kbuild test robot <fengguang.wu@...el.com>
To:	Thomas Graf <tgraf@...g.ch>
Cc:	kbuild-all@...org, netdev@...r.kernel.org
Subject: [net-next:master 194/208] include/net/dst_metadata.h:39:4: error:
 implicit declaration of function 'lwt_tun_info'

tree:   git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git master
head:   16040894b26af9f85d9395f072c53d76a44eba21
commit: 3093fbe7ff4bc7d1571fc217dade1cf80330a714 [194/208] route: Per route IP tunnel metadata via lightweight tunnel
config: i386-randconfig-i0-201529 (attached as .config)
reproduce:
  git checkout 3093fbe7ff4bc7d1571fc217dade1cf80330a714
  # save the attached .config to linux build tree
  make ARCH=i386 

All error/warnings (new ones prefixed by >>):

   In file included from net/core/dst.c:25:0:
   include/net/dst_metadata.h: In function 'skb_tunnel_info':
>> include/net/dst_metadata.h:39:4: error: implicit declaration of function 'lwt_tun_info' [-Werror=implicit-function-declaration]
       return lwt_tun_info(rt->rt_lwtstate);
       ^
>> include/net/dst_metadata.h:39:4: warning: return makes pointer from integer without a cast
   cc1: some warnings being treated as errors

vim +/lwt_tun_info +39 include/net/dst_metadata.h

    33			return &md_dst->u.tun_info;
    34	
    35		switch (family) {
    36		case AF_INET:
    37			rt = (struct rtable *)skb_dst(skb);
    38			if (rt && rt->rt_lwtstate)
  > 39				return lwt_tun_info(rt->rt_lwtstate);
    40			break;
    41		}
    42	

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