clockevents_update_freq
clockevents_update_freq(raw_cpu_ptr(twd_evt), twd_timer_rate);
clockevents_update_freq(cd, rate);
clockevents_update_freq(levt, tsc_khz * (1000 / TSC_DIVISOR));
clockevents_update_freq(this_cpu_ptr(&gic_clockevent_device), rate);
clockevents_update_freq(&ttcce->ce, ndata->new_rate / PRESCALE);
clockevents_update_freq(&cs->clkevt, ndata->new_rate);
extern int clockevents_update_freq(struct clock_event_device *ce, u32 freq);