netdev - Re: [PATCH net-next 01/14] iptunnel: Add common functions to get a tunnel route

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Date:   Tue, 19 Sep 2017 15:30:43 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Tom Herbert <tom@...ntonium.net>
Cc:     kbuild-all@...org, davem@...emloft.net, netdev@...r.kernel.org,
        pablo@...filter.org, laforge@...monks.org, rohit@...ntonium.net,
        Tom Herbert <tom@...ntonium.net>
Subject: Re: [PATCH net-next 01/14] iptunnel: Add common functions to get a
 tunnel route

Hi Tom,

[auto build test ERROR on net-next/master]

url:    https://github.com/0day-ci/linux/commits/Tom-Herbert/gtp-Additional-feature-support/20170919-143920
config: i386-randconfig-x074-201738 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

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

   In file included from net/ipv4/ip_tunnel_core.c:40:0:
   include/net/ip6_tunnel.h: In function 'ip6_tnl_get_route':
>> include/net/ip6_tunnel.h:168:28: error: implicit declaration of function 'dst_cache_get_ip6' [-Werror=implicit-function-declaration]
      struct dst_entry *ndst = dst_cache_get_ip6(dst_cache, saddr);
                               ^~~~~~~~~~~~~~~~~
>> include/net/ip6_tunnel.h:168:28: warning: initialization makes pointer from integer without a cast [-Wint-conversion]
   cc1: some warnings being treated as errors

vim +/dst_cache_get_ip6 +168 include/net/ip6_tunnel.h

   129	
   130	int ip6_tnl_rcv_ctl(struct ip6_tnl *t, const struct in6_addr *laddr,
   131			const struct in6_addr *raddr);
   132	int ip6_tnl_rcv(struct ip6_tnl *tunnel, struct sk_buff *skb,
   133			const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst,
   134			bool log_ecn_error);
   135	int ip6_tnl_xmit_ctl(struct ip6_tnl *t, const struct in6_addr *laddr,
   136			     const struct in6_addr *raddr);
   137	int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield,
   138			 struct flowi6 *fl6, int encap_limit, __u32 *pmtu, __u8 proto);
   139	__u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw);
   140	__u32 ip6_tnl_get_cap(struct ip6_tnl *t, const struct in6_addr *laddr,
   141				     const struct in6_addr *raddr);
   142	struct net *ip6_tnl_get_link_net(const struct net_device *dev);
   143	int ip6_tnl_get_iflink(const struct net_device *dev);
   144	int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu);
   145	struct dst_entry *__ip6_tnl_get_route(struct net_device *dev,
   146					      struct sk_buff *skb, struct sock *sk,
   147					      u8 proto, int oif, u8 tos, __be32 label,
   148					      const struct in6_addr *daddr,
   149					      struct in6_addr *saddr,
   150					      __be16 dport, __be16 sport,
   151					      struct dst_cache *dst_cache,
   152					      const struct ip_tunnel_info *info,
   153					      bool use_cache);
   154	
   155	static inline struct dst_entry *ip6_tnl_get_route(struct net_device *dev,
   156				struct sk_buff *skb, struct sock *sk, u8 proto,
   157				int oif, u8 tos, __be32 label,
   158				const struct in6_addr *daddr,
   159				struct in6_addr *saddr,
   160				__be16 dport, __be16 sport,
   161				struct dst_cache *dst_cache,
   162				const struct ip_tunnel_info *info)
   163	{
   164		 bool use_cache = (ip_tunnel_dst_cache_usable(skb, info) &&
   165			(!tos || info));
   166	
   167		if (use_cache) {
 > 168			struct dst_entry *ndst = dst_cache_get_ip6(dst_cache, saddr);
   169	
   170			if (ndst)
   171				return ndst;
   172		}
   173	
   174		return __ip6_tnl_get_route(dev, skb, sk, proto, oif, tos, label,
   175					   daddr, saddr, dport, sport, dst_cache,
   176					   info, use_cache);
   177	}
   178	

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