__clocksource_register_scale
__clocksource_register_scale(struct clocksource *cs, u32 scale, u32 freq);
return __clocksource_register_scale(cs, 1, 0);
return __clocksource_register_scale(cs, 1, hz);
return __clocksource_register_scale(cs, 1000, khz);
EXPORT_SYMBOL_GPL(__clocksource_register_scale);