ICSK_ACK_SCHED
inet_csk(sk)->icsk_ack.pending |= ICSK_ACK_SCHED;
return inet_csk(sk)->icsk_ack.pending & ICSK_ACK_SCHED;
icsk->icsk_ack.pending | ICSK_ACK_SCHED | ICSK_ACK_TIMER);
icsk->icsk_ack.pending &= ~(ICSK_ACK_SCHED | ICSK_ACK_TIMER);
icsk->icsk_ack.pending | ICSK_ACK_SCHED | ICSK_ACK_TIMER);
return (ack_pending & ICSK_ACK_SCHED) &&