TIMER_SOFTIRQ
#define SOFTIRQ_HOTPLUG_SAFE_MASK (BIT(TIMER_SOFTIRQ) | BIT(IRQ_POLL_SOFTIRQ) |\
cpu, kstat_softirqs_cpu(TIMER_SOFTIRQ, cpu));
return local_timers_pending() & BIT(TIMER_SOFTIRQ);
raise_timer_softirq(TIMER_SOFTIRQ);
open_softirq(TIMER_SOFTIRQ, run_timer_softirq);