[NET]: Add prefetch to skb_queue_walk.

include/linux/skbuff.h

@@ -1154,9 +1154,9 @@ static inline void kunmap_skb_frag(void *vaddr)
 }
 
 #define skb_queue_walk(queue, skb) \
-		for (skb = (queue)->next;			\
+		for (skb = (queue)->next, prefetch(skb->next);	\
 		     (skb != (struct sk_buff *)(queue));	\
-		     skb = skb->next)
+		     skb = skb->next, prefetch(skb->next))
 
 
 extern struct sk_buff *skb_recv_datagram(struct sock *sk, unsigned flags,