skb_append(skb_prev, skb); 
skb_append(skb_prev, skb, &sk->sk_write_queue); 
void nr_requeue_frames(struct sock *sk){	struct sk_buff *skb, *skb_prev = NULL;	while ((skb = skb_dequeue(&nr_sk(sk)->ack_queue)) != NULL) {		if (skb_prev == NULL)			skb_queue_head(&sk->sk_write_queue, skb);		else			skb_append(skb_prev, skb);		skb_prev = skb;	}}
10457	/local/tlutelli/issta_data/temp/c/2005_temp/2005/10457/8728b834b226ffcf2c94a58530090e292af2a7bf/nr_subr.c/clean/net/netrom/nr_subr.c