unsigned long __read_page_state(unsigned offset)
unsigned long __read_page_state(unsigned long offset)
unsigned long __read_page_state(unsigned offset){	unsigned long ret = 0;	int cpu;	for_each_online_cpu(cpu) {		unsigned long in;		in = (unsigned long)&per_cpu(page_states, cpu) + offset;		ret += *((unsigned long *)in);	}	return ret;}