23 struct page *balloon_page_enqueue(struct balloon_dev_info *b_dev_info)  in balloon_page_enqueue()
26 	struct page *page = alloc_page(balloon_mapping_gfp_mask() |  in balloon_page_enqueue()  local
28 	if (!page)  in balloon_page_enqueue()
36 	BUG_ON(!trylock_page(page));  in balloon_page_enqueue()
38 	balloon_page_insert(b_dev_info, page);  in balloon_page_enqueue()
41 	unlock_page(page);  in balloon_page_enqueue()
42 	return page;  in balloon_page_enqueue()
57 struct page *balloon_page_dequeue(struct balloon_dev_info *b_dev_info)  in balloon_page_dequeue()
59 	struct page *page, *tmp;  in balloon_page_dequeue()  local
65 	list_for_each_entry_safe(page, tmp, &b_dev_info->pages, lru) {  in balloon_page_dequeue()
71 		if (trylock_page(page)) {  in balloon_page_dequeue()
73 			if (!PagePrivate(page)) {  in balloon_page_dequeue()
75 				unlock_page(page);  in balloon_page_dequeue()
79 			balloon_page_delete(page);  in balloon_page_dequeue()
81 			unlock_page(page);  in balloon_page_dequeue()
101 		page = NULL;  in balloon_page_dequeue()
103 	return page;  in balloon_page_dequeue()
109 static inline void __isolate_balloon_page(struct page *page)  in __isolate_balloon_page()  argument
111 	struct balloon_dev_info *b_dev_info = balloon_page_device(page);  in __isolate_balloon_page()
115 	ClearPagePrivate(page);  in __isolate_balloon_page()
116 	list_del(&page->lru);  in __isolate_balloon_page()
121 static inline void __putback_balloon_page(struct page *page)  in __putback_balloon_page()  argument
123 	struct balloon_dev_info *b_dev_info = balloon_page_device(page);  in __putback_balloon_page()
127 	SetPagePrivate(page);  in __putback_balloon_page()
128 	list_add(&page->lru, &b_dev_info->pages);  in __putback_balloon_page()
134 bool balloon_page_isolate(struct page *page)  in balloon_page_isolate()  argument
145 	if (likely(get_page_unless_zero(page))) {  in balloon_page_isolate()
157 		if (likely(trylock_page(page))) {  in balloon_page_isolate()
163 			if (balloon_page_movable(page)) {  in balloon_page_isolate()
164 				__isolate_balloon_page(page);  in balloon_page_isolate()
165 				unlock_page(page);  in balloon_page_isolate()
168 			unlock_page(page);  in balloon_page_isolate()
170 		put_page(page);  in balloon_page_isolate()
176 void balloon_page_putback(struct page *page)  in balloon_page_putback()  argument
182 	lock_page(page);  in balloon_page_putback()
184 	if (__is_movable_balloon_page(page)) {  in balloon_page_putback()
185 		__putback_balloon_page(page);  in balloon_page_putback()
187 		put_page(page);  in balloon_page_putback()
190 		dump_page(page, "not movable balloon page");  in balloon_page_putback()
192 	unlock_page(page);  in balloon_page_putback()
196 int balloon_page_migrate(struct page *newpage,  in balloon_page_migrate()
197 			 struct page *page, enum migrate_mode mode)  in balloon_page_migrate()  argument
199 	struct balloon_dev_info *balloon = balloon_page_device(page);  in balloon_page_migrate()
209 	if (WARN_ON(!__is_movable_balloon_page(page))) {  in balloon_page_migrate()
210 		dump_page(page, "not movable balloon page");  in balloon_page_migrate()
216 		rc = balloon->migratepage(balloon, newpage, page, mode);  in balloon_page_migrate()