sock: add net to prot->enter_memory_pressure callback

The tcp_enter_memory_pressure calls NET_INC_STATS, but doesn't
have where to get the net from.

I decided to add a sk argument, not the net itself, only to factor
all the required sock_net(sk) calls inside the enter_memory_pressure 
callback itself.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/core/sock.c b/net/core/sock.c
index 2c0ba52..10a64d5 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1442,7 +1442,7 @@
 	/* Under pressure. */
 	if (allocated > prot->sysctl_mem[1])
 		if (prot->enter_memory_pressure)
-			prot->enter_memory_pressure();
+			prot->enter_memory_pressure(sk);
 
 	/* Over hard limit. */
 	if (allocated > prot->sysctl_mem[2])
diff --git a/net/decnet/af_decnet.c b/net/decnet/af_decnet.c
index 931bdf9..61b7df5 100644
--- a/net/decnet/af_decnet.c
+++ b/net/decnet/af_decnet.c
@@ -451,7 +451,7 @@
 
 static int dn_memory_pressure;
 
-static void dn_enter_memory_pressure(void)
+static void dn_enter_memory_pressure(struct sock *sk)
 {
 	if (!dn_memory_pressure) {
 		dn_memory_pressure = 1;
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 525dcf5..bc8559a 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -316,7 +316,7 @@
 
 EXPORT_SYMBOL(tcp_memory_pressure);
 
-void tcp_enter_memory_pressure(void)
+void tcp_enter_memory_pressure(struct sock *sk)
 {
 	if (!tcp_memory_pressure) {
 		NET_INC_STATS(LINUX_MIB_TCPMEMORYPRESSURES);
@@ -649,7 +649,7 @@
 		}
 		__kfree_skb(skb);
 	} else {
-		sk->sk_prot->enter_memory_pressure();
+		sk->sk_prot->enter_memory_pressure(sk);
 		sk_stream_moderate_sndbuf(sk);
 	}
 	return NULL;
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index df5572c..6aba01b 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -116,7 +116,7 @@
 static atomic_t sctp_memory_allocated;
 static atomic_t sctp_sockets_allocated;
 
-static void sctp_enter_memory_pressure(void)
+static void sctp_enter_memory_pressure(struct sock *sk)
 {
 	sctp_memory_pressure = 1;
 }