148 static void balloon_append(struct page *page)  in balloon_append()  argument
150 	__SetPageOffline(page);  in balloon_append()
153 	if (PageHighMem(page)) {  in balloon_append()
154 		list_add_tail(&page->lru, &ballooned_pages);  in balloon_append()
157 		list_add(&page->lru, &ballooned_pages);  in balloon_append()
164 static struct page *balloon_retrieve(bool require_lowmem)  in balloon_retrieve()
166 	struct page *page;  in balloon_retrieve()  local
171 	page = list_entry(ballooned_pages.next, struct page, lru);  in balloon_retrieve()
172 	if (require_lowmem && PageHighMem(page))  in balloon_retrieve()
174 	list_del(&page->lru);  in balloon_retrieve()
176 	if (PageHighMem(page))  in balloon_retrieve()
181 	__ClearPageOffline(page);  in balloon_retrieve()
182 	return page;  in balloon_retrieve()
185 static struct page *balloon_next_page(struct page *page)  in balloon_next_page()  argument
187 	struct list_head *next = page->lru.next;  in balloon_next_page()
190 	return list_entry(next, struct page, lru);  in balloon_next_page()
340 static void xen_online_page(struct page *page, unsigned int order)  in xen_online_page()  argument
343 	unsigned long start_pfn = page_to_pfn(page);  in xen_online_page()
344 	struct page *p;  in xen_online_page()
390 	struct page   *page;  in increase_reservation()  local
395 	page = list_first_entry_or_null(&ballooned_pages, struct page, lru);  in increase_reservation()
397 		if (!page) {  in increase_reservation()
402 		frame_list[i] = page_to_xen_pfn(page);  in increase_reservation()
403 		page = balloon_next_page(page);  in increase_reservation()
411 		page = balloon_retrieve(false);  in increase_reservation()
412 		BUG_ON(page == NULL);  in increase_reservation()
414 		xenmem_reservation_va_mapping_update(1, &page, &frame_list[i]);  in increase_reservation()
417 		free_reserved_page(page);  in increase_reservation()
429 	struct page *page, *tmp;  in decrease_reservation()  local
437 		page = alloc_page(gfp);  in decrease_reservation()
438 		if (page == NULL) {  in decrease_reservation()
443 		adjust_managed_page_count(page, -1);  in decrease_reservation()
444 		xenmem_reservation_scrub_page(page);  in decrease_reservation()
445 		list_add(&page->lru, &pages);  in decrease_reservation()
462 	list_for_each_entry_safe(page, tmp, &pages, lru) {  in decrease_reservation()
463 		frame_list[i++] = xen_page_to_gfn(page);  in decrease_reservation()
465 		xenmem_reservation_va_mapping_reset(1, &page);  in decrease_reservation()
467 		list_del(&page->lru);  in decrease_reservation()
469 		balloon_append(page);  in decrease_reservation()
600 int xen_alloc_ballooned_pages(unsigned int nr_pages, struct page **pages)  in xen_alloc_ballooned_pages()
603 	struct page *page;  in xen_alloc_ballooned_pages()  local
611 		page = balloon_retrieve(true);  in xen_alloc_ballooned_pages()
612 		if (page) {  in xen_alloc_ballooned_pages()
613 			pages[pgno++] = page;  in xen_alloc_ballooned_pages()
622 				ret = xen_alloc_p2m_entry(page_to_pfn(page));  in xen_alloc_ballooned_pages()
653 void xen_free_ballooned_pages(unsigned int nr_pages, struct page **pages)  in xen_free_ballooned_pages()