[ICMP]: Store sock rather than socket for ICMP flow control.

Basically, there is no difference, what to store: socket or sock. Though,
sock looks better as there will be 1 less dereferrence on the fast path.
Signed-off-by: NDenis V. Lunev <den@openvz.org>
Acked-by: NDaniel Lezcano <dlezcano@fr.ibm.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv4/icmp.c

@@ -229,14 +229,14 @@ static const struct icmp_control icmp_pointers[NR_ICMP_TYPES+1];
  *
  *	On SMP we have one ICMP socket per-cpu.
  */
-static DEFINE_PER_CPU(struct socket *, __icmp_socket) = NULL;
-#define icmp_socket	__get_cpu_var(__icmp_socket)
+static DEFINE_PER_CPU(struct sock *, __icmp_sk) = NULL;
+#define icmp_sk		__get_cpu_var(__icmp_sk)
 
 static inline int icmp_xmit_lock(void)
 {
 	local_bh_disable();
 
-	if (unlikely(!spin_trylock(&icmp_socket->sk->sk_lock.slock))) {
+	if (unlikely(!spin_trylock(&icmp_sk->sk_lock.slock))) {
 		/* This can happen if the output path signals a
 		 * dst_link_failure() for an outgoing ICMP packet.
 		 */
@@ -248,7 +248,7 @@ static inline int icmp_xmit_lock(void)
 
 static inline void icmp_xmit_unlock(void)
 {
-	spin_unlock_bh(&icmp_socket->sk->sk_lock.slock);
+	spin_unlock_bh(&icmp_sk->sk_lock.slock);
 }
 
 /*
@@ -349,7 +349,7 @@ static void icmp_push_reply(struct icmp_bxm *icmp_param,
 	struct sock *sk;
 	struct sk_buff *skb;
 
-	sk = icmp_socket->sk;
+	sk = icmp_sk;
 	if (ip_append_data(sk, icmp_glue_bits, icmp_param,
 			   icmp_param->data_len+icmp_param->head_len,
 			   icmp_param->head_len,
@@ -378,7 +378,7 @@ static void icmp_push_reply(struct icmp_bxm *icmp_param,
 
 static void icmp_reply(struct icmp_bxm *icmp_param, struct sk_buff *skb)
 {
-	struct sock *sk = icmp_socket->sk;
+	struct sock *sk = icmp_sk;
 	struct inet_sock *inet = inet_sk(sk);
 	struct ipcm_cookie ipc;
 	struct rtable *rt = (struct rtable *)skb->dst;
@@ -546,7 +546,7 @@ void icmp_send(struct sk_buff *skb_in, int type, int code, __be32 info)
 	icmp_param.data.icmph.checksum	 = 0;
 	icmp_param.skb	  = skb_in;
 	icmp_param.offset = skb_network_offset(skb_in);
-	inet_sk(icmp_socket->sk)->tos = tos;
+	inet_sk(icmp_sk)->tos = tos;
 	ipc.addr = iph->saddr;
 	ipc.opt = &icmp_param.replyopts;
 
@@ -1146,13 +1146,13 @@ static void __exit icmp_exit(void)
 	int i;
 
 	for_each_possible_cpu(i) {
-		struct socket *sock;
+		struct sock *sk;
 
-		sock = per_cpu(__icmp_socket, i);
-		if (sock == NULL)
+		sk = per_cpu(__icmp_sk, i);
+		if (sk == NULL)
 			continue;
-		per_cpu(__icmp_socket, i) = NULL;
-		sock_release(sock);
+		per_cpu(__icmp_sk, i) = NULL;
+		sock_release(sk->sk_socket);
 	}
 }
 
@@ -1169,8 +1169,7 @@ int __init icmp_init(void)
 		if (err < 0)
 			goto fail;
 
-		per_cpu(__icmp_socket, i) = sock;
-		sk = sock->sk;
+		per_cpu(__icmp_sk, i) = sk = sock->sk;
 		sk->sk_allocation = GFP_ATOMIC;
 
 		/* Enough space for 2 64K ICMP packets, including

net/ipv6/icmp.c

@@ -80,8 +80,8 @@ EXPORT_SYMBOL(icmpv6msg_statistics);
  *
  *	On SMP we have one ICMP socket per-cpu.
  */
-static DEFINE_PER_CPU(struct socket *, __icmpv6_socket) = NULL;
-#define icmpv6_socket	__get_cpu_var(__icmpv6_socket)
+static DEFINE_PER_CPU(struct sock *, __icmpv6_sk) = NULL;
+#define icmpv6_sk	__get_cpu_var(__icmpv6_sk)
 
 static int icmpv6_rcv(struct sk_buff *skb);
 
@@ -94,7 +94,7 @@ static __inline__ int icmpv6_xmit_lock(void)
 {
 	local_bh_disable();
 
-	if (unlikely(!spin_trylock(&icmpv6_socket->sk->sk_lock.slock))) {
+	if (unlikely(!spin_trylock(&icmpv6_sk->sk_lock.slock))) {
 		/* This can happen if the output path (f.e. SIT or
 		 * ip6ip6 tunnel) signals dst_link_failure() for an
 		 * outgoing ICMP6 packet.
@@ -107,7 +107,7 @@ static __inline__ int icmpv6_xmit_lock(void)
 
 static __inline__ void icmpv6_xmit_unlock(void)
 {
-	spin_unlock_bh(&icmpv6_socket->sk->sk_lock.slock);
+	spin_unlock_bh(&icmpv6_sk->sk_lock.slock);
 }
 
 /*
@@ -392,7 +392,7 @@ void icmpv6_send(struct sk_buff *skb, int type, int code, __u32 info,
 	if (icmpv6_xmit_lock())
 		return;
 
-	sk = icmpv6_socket->sk;
+	sk = icmpv6_sk;
 	np = inet6_sk(sk);
 
 	if (!icmpv6_xrlim_allow(sk, type, &fl))
@@ -538,7 +538,7 @@ static void icmpv6_echo_reply(struct sk_buff *skb)
 	if (icmpv6_xmit_lock())
 		return;
 
-	sk = icmpv6_socket->sk;
+	sk = icmpv6_sk;
 	np = inet6_sk(sk);
 
 	if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst))
@@ -776,7 +776,7 @@ static int icmpv6_rcv(struct sk_buff *skb)
 }
 
 /*
- * Special lock-class for __icmpv6_socket:
+ * Special lock-class for __icmpv6_sk:
  */
 static struct lock_class_key icmpv6_socket_sk_dst_lock_key;
 
@@ -786,8 +786,9 @@ int __init icmpv6_init(void)
 	int err, i, j;
 
 	for_each_possible_cpu(i) {
+		struct socket *sock;
 		err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6,
-				       &per_cpu(__icmpv6_socket, i));
+				       &sock);
 		if (err < 0) {
 			printk(KERN_ERR
 			       "Failed to initialize the ICMP6 control socket "
@@ -796,12 +797,12 @@ int __init icmpv6_init(void)
 			goto fail;
 		}
 
-		sk = per_cpu(__icmpv6_socket, i)->sk;
+		per_cpu(__icmpv6_sk, i) = sk = sock->sk;
 		sk->sk_allocation = GFP_ATOMIC;
 		/*
 		 * Split off their lock-class, because sk->sk_dst_lock
 		 * gets used from softirqs, which is safe for
-		 * __icmpv6_socket (because those never get directly used
+		 * __icmpv6_sk (because those never get directly used
 		 * via userspace syscalls), but unsafe for normal sockets.
 		 */
 		lockdep_set_class(&sk->sk_dst_lock,
@@ -829,7 +830,7 @@ int __init icmpv6_init(void)
 	for (j = 0; j < i; j++) {
 		if (!cpu_possible(j))
 			continue;
-		sock_release(per_cpu(__icmpv6_socket, j));
+		sock_release(per_cpu(__icmpv6_sk, j)->sk_socket);
 	}
 
 	return err;
@@ -840,7 +841,7 @@ void icmpv6_cleanup(void)
 	int i;
 
 	for_each_possible_cpu(i) {
-		sock_release(per_cpu(__icmpv6_socket, i));
+		sock_release(per_cpu(__icmpv6_sk, i)->sk_socket);
 	}
 	inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6);
 }