Symbol: skb_is_tcp_pure_ack
net/core/sock.c
2783
if (skb_is_tcp_pure_ack(skb))
net/ipv4/tcp_output.c
1624
skb->destructor = skb_is_tcp_pure_ack(skb) ? __sock_wfree : tcp_wfree;
net/mptcp/options.c
673
!skb || !skb_is_tcp_pure_ack(skb) ||