taglinefilesource code
acked68include/linux/skbuff.hvolatile char     acked,
acked517net/inet/skbuff.cn->acked=skb->acked;
acked3709net/inet/tcp.cif ((!dup_dumped && (skb1 == NULL || skb1->acked)) || before(th->seq, sk->acked_seq+1)) 
acked3723net/inet/tcp.cskb->acked = 1;
acked3750net/inet/tcp.cskb2->acked = 1;
acked3796net/inet/tcp.cif (!skb->acked) 
acked3819net/inet/tcp.cif (skb1->acked) 
acked4316net/inet/tcp.cskb->acked = 0;