lapic_thermal_handler_t
bool lapic_enable_thermal(lapic_thermal_handler_t *func, void *func_arg);
lapic_thermal_handler_t *func;
func = (lapic_thermal_handler_t *)atomic_load_acq_ptr(
lapic_enable_thermal(lapic_thermal_handler_t *func, void *func_arg)
static lapic_thermal_handler_t *lapic_thermal_function;