[NET]: Use BUILD_BUG_ON() for checking size of skb->cb.

Signed-off-by: NYOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv4/af_inet.c

@@ -1254,10 +1254,7 @@ static int __init inet_init(void)
 	struct list_head *r;
 	int rc = -EINVAL;
 
-	if (sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb)) {
-		printk(KERN_CRIT "%s: panic\n", __FUNCTION__);
-		goto out;
-	}
+	BUILD_BUG_ON(sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb));
 
 	rc = proto_register(&tcp_prot, 1);
 	if (rc)

net/ipv6/af_inet6.c

@@ -761,6 +761,8 @@ static int __init inet6_init(void)
         struct list_head *r;
 	int err;
 
+	BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
+
 #ifdef MODULE
 #if 0 /* FIXME --RR */
 	if (!mod_member_present(&__this_module, can_unload))
@@ -770,11 +772,6 @@ static int __init inet6_init(void)
 #endif
 #endif
 
-	if (sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb)) {
-		printk(KERN_CRIT "inet6_proto_init: size fault\n");
-		return -EINVAL;
-	}
-
 	err = proto_register(&tcpv6_prot, 1);
 	if (err)
 		goto out;

net/netlink/af_netlink.c

@@ -1762,8 +1762,6 @@ static struct net_proto_family netlink_family_ops = {
 	.owner	= THIS_MODULE,	/* for consistency 8) */
 };
 
-extern void netlink_skb_parms_too_large(void);
-
 static int __init netlink_proto_init(void)
 {
 	struct sk_buff *dummy_skb;
@@ -1775,8 +1773,7 @@ static int __init netlink_proto_init(void)
 	if (err != 0)
 		goto out;
 
-	if (sizeof(struct netlink_skb_parms) > sizeof(dummy_skb->cb))
-		netlink_skb_parms_too_large();
+	BUILD_BUG_ON(sizeof(struct netlink_skb_parms) > sizeof(dummy_skb->cb));
 
 	nl_table = kcalloc(MAX_LINKS, sizeof(*nl_table), GFP_KERNEL);
 	if (!nl_table)

net/unix/af_unix.c

@@ -2060,10 +2060,7 @@ static int __init af_unix_init(void)
 	int rc = -1;
 	struct sk_buff *dummy_skb;
 
-	if (sizeof(struct unix_skb_parms) > sizeof(dummy_skb->cb)) {
-		printk(KERN_CRIT "%s: panic\n", __FUNCTION__);
-		goto out;
-	}
+	BUILD_BUG_ON(sizeof(struct unix_skb_parms) > sizeof(dummy_skb->cb));
 
 	rc = proto_register(&unix_proto, 1);
         if (rc != 0) {