pages->private = order;
set_page_private(pages, order);
static struct page *kimage_alloc_pages(gfp_t gfp_mask, unsigned int order){	struct page *pages;	pages = alloc_pages(gfp_mask, order);	if (pages) {		unsigned int count, i;		pages->mapping = NULL;		pages->private = order;		count = 1 << order;		for (i = 0; i < count; i++)			SetPageReserved(pages + i);	}	return pages;}