void __get_page_state(struct page_state *ret, int nr)
void __get_page_state(struct page_state *ret, int nr, cpumask_t *cpumask)
void __get_page_state(struct page_state *ret, int nr){	int cpu = 0;	memset(ret, 0, sizeof(*ret));	cpu = first_cpu(cpu_online_map);	while (cpu < NR_CPUS) {		unsigned long *in, *out, off;		in = (unsigned long *)&per_cpu(page_states, cpu);		cpu = next_cpu(cpu, cpu_online_map);		if (cpu < NR_CPUS)			prefetch(&per_cpu(page_states, cpu));		out = (unsigned long *)ret;		for (off = 0; off < nr; off++)			*out++ += *in++;	}}