Add missing KERN_foo printk specifiers to networking.

Based upon a patch from Denis Vlasenko.

net/ipv4/route.c

@@ -583,7 +583,7 @@ static int rt_garbage_collect(void)
 	if (atomic_read(&ipv4_dst_ops.entries) < ip_rt_max_size)
 		goto out;
 	if (net_ratelimit())
-		printk("dst cache overflow\n");
+		printk(KERN_WARNING "dst cache overflow\n");
 	return 1;
 
 work_done:
@@ -657,7 +657,7 @@ static int rt_intern_hash(unsigned hash, struct rtable *rt, struct rtable **rp)
 			}
 
 			if (net_ratelimit())
-				printk("Neighbour table overflow.\n");
+				printk(KERN_WARNING "Neighbour table overflow.\n");
 			rt_drop(rt);
 			return -ENOBUFS;
 		}
@@ -667,8 +667,8 @@ static int rt_intern_hash(unsigned hash, struct rtable *rt, struct rtable **rp)
 #if RT_CACHE_DEBUG >= 2
 	if (rt->u.rt_next) {
 		struct rtable *trt;
-		printk("rt_cache @%02x: %u.%u.%u.%u", hash,
-				NIPQUAD(rt->rt_dst));
+		printk(KERN_DEBUG "rt_cache @%02x: %u.%u.%u.%u", hash,
+		       NIPQUAD(rt->rt_dst));
 		for (trt = rt->u.rt_next; trt; trt = trt->u.rt_next)
 			printk(" . %u.%u.%u.%u", NIPQUAD(trt->rt_dst));
 		printk("\n");
@@ -2487,7 +2487,7 @@ void __init ip_rt_init(void)
 	if (!rt_hash_table)
 		panic("Failed to allocate IP route cache hash table\n");
 
-	printk("IP: routing cache hash table of %u buckets, %ldKbytes\n",
+	printk(KERN_INFO "IP: routing cache hash table of %u buckets, %ldKbytes\n",
 	       rt_hash_mask,
 	       (long) (rt_hash_mask * sizeof(struct rt_hash_bucket)) / 1024);
 

net/ipv4/tcp.c

@@ -1792,7 +1792,7 @@ void tcp_destroy_sock(struct sock *sk)
 
 #ifdef TCP_DEBUG
 	if (sk->zapped) {
-		printk("TCP: double destroy sk=%p\n", sk);
+		printk(KERN_DEBUG "TCP: double destroy sk=%p\n", sk);
 		sock_hold(sk);
 	}
 	sk->zapped = 1;
@@ -2558,7 +2558,7 @@ void __init tcp_init(void)
 		sysctl_tcp_rmem[2] = 2*43689;
 	}
 
-	printk("TCP: Hash tables configured (established %d bind %d)\n",
+	printk(KERN_INFO "TCP: Hash tables configured (established %d bind %d)\n",
 	       tcp_ehash_size<<1, tcp_bhash_size);
 
 	tcpdiag_init();