adjust_present_page_count
adjust_present_page_count(pfn_to_page(start_pfn), mem->group,
adjust_present_page_count(pfn_to_page(start_pfn), mem->group,
adjust_present_page_count(pfn_to_page(start_pfn),
extern void adjust_present_page_count(struct page *page,
adjust_present_page_count(pfn_to_page(pfn), group, nr_pages);
adjust_present_page_count(pfn_to_page(start_pfn), group, -nr_pages);