preempt_disable();
void native_idle(void){	while (1) {		ppc64_runlatch_off();		if (!need_resched())			power4_idle();		if (need_resched()) {			ppc64_runlatch_on();			schedule();		}		if (cpu_is_offline(smp_processor_id()) &&		    system_state == SYSTEM_RUNNING)			cpu_die();	}}