[INET]: Uninline the __inet_lookup_established function.

This is -700 bytes from the net/ipv4/built-in.o

add/remove: 1/0 grow/shrink: 1/3 up/down: 340/-1040 (-700)
function                                     old     new   delta
__inet_lookup_established                      -     339    +339
tcp_sacktag_write_queue                     2254    2255      +1
tcp_v4_err                                  1304     973    -331
tcp_v4_rcv                                  2089    1744    -345
tcp_v4_do_rcv                                826     462    -364

Exporting is for dccp module (used via e.g. inet_lookup).
Signed-off-by: NPavel Emelyanov <xemul@openvz.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/net/inet_hashtables.h

@@ -374,43 +374,9 @@ typedef __u64 __bitwise __addrpair;
  *
  * Local BH must be disabled here.
  */
-static inline struct sock *
-	__inet_lookup_established(struct inet_hashinfo *hashinfo,
+extern struct sock * __inet_lookup_established(struct inet_hashinfo *hashinfo,
 		const __be32 saddr, const __be16 sport,
-				  const __be32 daddr, const u16 hnum,
-				  const int dif)
-{
-	INET_ADDR_COOKIE(acookie, saddr, daddr)
-	const __portpair ports = INET_COMBINED_PORTS(sport, hnum);
-	struct sock *sk;
-	const struct hlist_node *node;
-	/* Optimize here for direct hit, only listening connections can
-	 * have wildcards anyways.
-	 */
-	unsigned int hash = inet_ehashfn(daddr, hnum, saddr, sport);
-	struct inet_ehash_bucket *head = inet_ehash_bucket(hashinfo, hash);
-	rwlock_t *lock = inet_ehash_lockp(hashinfo, hash);
-
-	prefetch(head->chain.first);
-	read_lock(lock);
-	sk_for_each(sk, node, &head->chain) {
-		if (INET_MATCH(sk, hash, acookie, saddr, daddr, ports, dif))
-			goto hit; /* You sunk my battleship! */
-	}
-
-	/* Must check for a TIME_WAIT'er before going to listener hash. */
-	sk_for_each(sk, node, &head->twchain) {
-		if (INET_TW_MATCH(sk, hash, acookie, saddr, daddr, ports, dif))
-			goto hit;
-	}
-	sk = NULL;
-out:
-	read_unlock(lock);
-	return sk;
-hit:
-	sock_hold(sk);
-	goto out;
-}
+		const __be32 daddr, const u16 hnum, const int dif);
 
 static inline struct sock *
 	inet_lookup_established(struct inet_hashinfo *hashinfo,

net/ipv4/inet_hashtables.c

@@ -190,6 +190,44 @@ struct sock *__inet_lookup_listener(struct inet_hashinfo *hashinfo,
 }
 EXPORT_SYMBOL_GPL(__inet_lookup_listener);
 
+struct sock * __inet_lookup_established(struct inet_hashinfo *hashinfo,
+				  const __be32 saddr, const __be16 sport,
+				  const __be32 daddr, const u16 hnum,
+				  const int dif)
+{
+	INET_ADDR_COOKIE(acookie, saddr, daddr)
+	const __portpair ports = INET_COMBINED_PORTS(sport, hnum);
+	struct sock *sk;
+	const struct hlist_node *node;
+	/* Optimize here for direct hit, only listening connections can
+	 * have wildcards anyways.
+	 */
+	unsigned int hash = inet_ehashfn(daddr, hnum, saddr, sport);
+	struct inet_ehash_bucket *head = inet_ehash_bucket(hashinfo, hash);
+	rwlock_t *lock = inet_ehash_lockp(hashinfo, hash);
+
+	prefetch(head->chain.first);
+	read_lock(lock);
+	sk_for_each(sk, node, &head->chain) {
+		if (INET_MATCH(sk, hash, acookie, saddr, daddr, ports, dif))
+			goto hit; /* You sunk my battleship! */
+	}
+
+	/* Must check for a TIME_WAIT'er before going to listener hash. */
+	sk_for_each(sk, node, &head->twchain) {
+		if (INET_TW_MATCH(sk, hash, acookie, saddr, daddr, ports, dif))
+			goto hit;
+	}
+	sk = NULL;
+out:
+	read_unlock(lock);
+	return sk;
+hit:
+	sock_hold(sk);
+	goto out;
+}
+EXPORT_SYMBOL_GPL(__inet_lookup_established);
+
 /* called with local bh disabled */
 static int __inet_check_established(struct inet_timewait_death_row *death_row,
 				    struct sock *sk, __u16 lport,