if (page_to_pfn(page) >= zone->zone_start_pfn + zone->spanned_pages) return 1; if (page_to_pfn(page) < zone->zone_start_pfn) return 1;
int ret = 0; unsigned seq; unsigned long pfn = page_to_pfn(page);
static int page_outside_zone_boundaries(struct zone *zone, struct page *page){	if (page_to_pfn(page) >= zone->zone_start_pfn + zone->spanned_pages)		return 1;	if (page_to_pfn(page) < zone->zone_start_pfn)		return 1;	return 0;}