[NET] NETNS: Omit sock->sk_net without CONFIG_NET_NS.

Introduce per-sock inlines: sock_net(), sock_net_set()
and per-inet_timewait_sock inlines: twsk_net(), twsk_net_set().
Without CONFIG_NET_NS, no namespace other than &init_net exists.
Let's explicitly define them to help compiler optimizations.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/net/ipv6/icmp.c b/net/ipv6/icmp.c
index 50857662e6b7..63309d10df3a 100644
--- a/net/ipv6/icmp.c
+++ b/net/ipv6/icmp.c
@@ -163,7 +163,7 @@ static inline int icmpv6_xrlim_allow(struct sock *sk, int type,
                                      struct flowi *fl)
 {
         struct dst_entry *dst;
-        struct net *net = sk->sk_net;
+        struct net *net = sock_net(sk);
         int res = 0;
 
         /* Informational messages are not limited. */