[SOCK]: Add udp_hash member to struct proto.

Inspired by the commit ab1e0a13 ([SOCK] proto: Add hashinfo member to 
struct proto) from Arnaldo, I made similar thing for UDP/-Lite IPv4 
and -v6 protocols.

The result is not that exciting, but it removes some levels of
indirection in udpxxx_get_port and saves some space in code and text.

The first step is to union existing hashinfo and new udp_hash on the
struct proto and give a name to this union, since future initialization 
of tcpxxx_prot, dccp_vx_protinfo and udpxxx_protinfo will cause gcc 
warning about inability to initialize anonymous member this way.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/inet_hashtables.h b/include/net/inet_hashtables.h
index 97dc35a..d99c1ba 100644
--- a/include/net/inet_hashtables.h
+++ b/include/net/inet_hashtables.h
@@ -223,7 +223,7 @@
 /* Caller must disable local BH processing. */
 static inline void __inet_inherit_port(struct sock *sk, struct sock *child)
 {
-	struct inet_hashinfo *table = sk->sk_prot->hashinfo;
+	struct inet_hashinfo *table = sk->sk_prot->h.hashinfo;
 	const int bhash = inet_bhashfn(inet_sk(child)->num, table->bhash_size);
 	struct inet_bind_hashbucket *head = &table->bhash[bhash];
 	struct inet_bind_bucket *tb;
diff --git a/include/net/sock.h b/include/net/sock.h
index b89680d..c3175c4 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -586,7 +586,10 @@
 	struct request_sock_ops	*rsk_prot;
 	struct timewait_sock_ops *twsk_prot;
 
-	struct inet_hashinfo	*hashinfo;
+	union {
+		struct inet_hashinfo	*hashinfo;
+		struct hlist_head	*udp_hash;
+	} h;
 
 	struct module		*owner;