TICK_DO_TIMER_NONE
WRITE_ONCE(tick_do_timer_cpu, TICK_DO_TIMER_NONE);
} else if (tick_cpu != TICK_DO_TIMER_NONE) {
if (WARN_ON_ONCE(tick_cpu == TICK_DO_TIMER_NONE))
if (IS_ENABLED(CONFIG_NO_HZ_COMMON) && unlikely(tick_cpu == TICK_DO_TIMER_NONE)) {
(tick_cpu != TICK_DO_TIMER_NONE || !tick_sched_flag_test(ts, TS_FLAG_DO_TIMER_LAST)))