TCPF_LAST_ACK      89 net/core/stream.c 	       (TCPF_FIN_WAIT1 | TCPF_CLOSING | TCPF_LAST_ACK);
TCPF_LAST_ACK    1937 net/ipv4/tcp.c 		    (1 << old_state) & (TCPF_CLOSING | TCPF_LAST_ACK))) {