tick_nohz_is_active
if (tick_nohz_is_active()) {
extern bool tick_nohz_is_active(void);
if (!hrtimer_hres_active(cpu_base) && !tick_nohz_is_active())
EXPORT_SYMBOL_GPL(tick_nohz_is_active);
if (sysctl_timer_migration && tick_nohz_is_active())