TCP_DELACK_TIMER_DEFERRED
TCPF_DELACK_TIMER_DEFERRED = BIT(TCP_DELACK_TIMER_DEFERRED),
if (!test_and_set_bit(TCP_DELACK_TIMER_DEFERRED, &sk->sk_tsq_flags))
if (!test_and_set_bit(TCP_DELACK_TIMER_DEFERRED,