[SKB]: __skb_append = __skb_queue_after

This expresses __skb_append in terms of __skb_queue_after, exploiting that

  __skb_append(old, new, list) = __skb_queue_after(list, old, new).

Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/skbuff.h

@@ -697,6 +697,9 @@ static inline void __skb_queue_after(struct sk_buff_head *list,
 	__skb_insert(newsk, prev, prev->next, list);
 }
 
+extern void skb_append(struct sk_buff *old, struct sk_buff *newsk,
+		       struct sk_buff_head *list);
+
 /**
  *	__skb_queue_head - queue a buffer at the list head
  *	@list: list to use
@@ -738,15 +741,6 @@ static inline void __skb_queue_tail(struct sk_buff_head *list,
 	next->prev  = prev->next = newsk;
 }
 
-/*
- *	Place a packet after a given packet in a list.
- */
-extern void	   skb_append(struct sk_buff *old, struct sk_buff *newsk, struct sk_buff_head *list);
-static inline void __skb_append(struct sk_buff *old, struct sk_buff *newsk, struct sk_buff_head *list)
-{
-	__skb_insert(newsk, old, old->next, list);
-}
-
 /*
  * remove sk_buff from list. _Must_ be called atomically, and with
  * the list known..

include/net/tcp.h

@@ -1247,7 +1247,7 @@ static inline void tcp_insert_write_queue_after(struct sk_buff *skb,
 						struct sk_buff *buff,
 						struct sock *sk)
 {
-	__skb_append(skb, buff, &sk->sk_write_queue);
+	__skb_queue_after(&sk->sk_write_queue, skb, buff);
 }
 
 /* Insert skb between prev and next on the write queue of sk.  */

net/core/skbuff.c

@@ -1860,7 +1860,7 @@ void skb_append(struct sk_buff *old, struct sk_buff *newsk, struct sk_buff_head
 	unsigned long flags;
 
 	spin_lock_irqsave(&list->lock, flags);
-	__skb_append(old, newsk, list);
+	__skb_queue_after(list, old, newsk);
 	spin_unlock_irqrestore(&list->lock, flags);
 }
 

net/ipv4/tcp_input.c

@@ -3968,7 +3968,7 @@ drop:
 		u32 end_seq = TCP_SKB_CB(skb)->end_seq;
 
 		if (seq == TCP_SKB_CB(skb1)->end_seq) {
-			__skb_append(skb1, skb, &tp->out_of_order_queue);
+			__skb_queue_after(&tp->out_of_order_queue, skb1, skb);
 
 			if (!tp->rx_opt.num_sacks ||
 			    tp->selective_acks[0].end_seq != seq)