net: Remove prefetches from SKB list handlers.

Noticed by Linus.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/linux/skbuff.h

@@ -1783,7 +1783,7 @@ static inline int pskb_trim_rcsum(struct sk_buff *skb, unsigned int len)
 
 #define skb_queue_walk(queue, skb) \
 		for (skb = (queue)->next;					\
-		     prefetch(skb->next), (skb != (struct sk_buff *)(queue));	\
+		     (skb != (struct sk_buff *)(queue));			\
 		     skb = skb->next)
 
 #define skb_queue_walk_safe(queue, skb, tmp)					\
@@ -1792,7 +1792,7 @@ static inline int pskb_trim_rcsum(struct sk_buff *skb, unsigned int len)
 		     skb = tmp, tmp = skb->next)
 
 #define skb_queue_walk_from(queue, skb)						\
-		for (; prefetch(skb->next), (skb != (struct sk_buff *)(queue));	\
+		for (; (skb != (struct sk_buff *)(queue));			\
 		     skb = skb->next)
 
 #define skb_queue_walk_from_safe(queue, skb, tmp)				\
@@ -1802,7 +1802,7 @@ static inline int pskb_trim_rcsum(struct sk_buff *skb, unsigned int len)
 
 #define skb_queue_reverse_walk(queue, skb) \
 		for (skb = (queue)->prev;					\
-		     prefetch(skb->prev), (skb != (struct sk_buff *)(queue));	\
+		     (skb != (struct sk_buff *)(queue));			\
 		     skb = skb->prev)
 
 #define skb_queue_reverse_walk_safe(queue, skb, tmp)				\