mm/memory_hotplug: simplify online_pages_range()

#endif

}

static int online_pages_blocks(unsigned long start, unsigned long nr_pages)

{

	unsigned long end = start + nr_pages;

	int order, onlined_pages = 0;

	while (start < end) {

		order = min(MAX_ORDER - 1,

			get_order(PFN_PHYS(end) - PFN_PHYS(start)));

		(*online_page_callback)(pfn_to_page(start), order);

		onlined_pages += (1UL << order);

		start += (1UL << order);

	}

	return onlined_pages;

}

static int online_pages_range(unsigned long start_pfn, unsigned long nr_pages,

			void *arg)

{

	unsigned long onlined_pages = *(unsigned long *)arg;

	const unsigned long end_pfn = start_pfn + nr_pages;

	unsigned long pfn;

	int order;

	/*

	 * Online the pages. The callback might decide to keep some pages

	 * PG_reserved (to add them to the buddy later), but we still account

	 * them as being online/belonging to this zone ("present").

	 */

	for (pfn = start_pfn; pfn < end_pfn; pfn += 1ul << order) {

		order = min(MAX_ORDER - 1, get_order(PFN_PHYS(end_pfn - pfn)));

		(*online_page_callback)(pfn_to_page(pfn), order);

	}

	onlined_pages += online_pages_blocks(start_pfn, nr_pages);

	online_mem_sections(start_pfn, start_pfn + nr_pages);

	/* mark all involved sections as online */

	online_mem_sections(start_pfn, end_pfn);

	*(unsigned long *)arg = onlined_pages;

	*(unsigned long *)arg += nr_pages;

	return 0;

}