15 				     struct page *page)  in balloon_page_enqueue_one()  argument
18 	 * Block others from accessing the 'page' when we get around to  in balloon_page_enqueue_one()
20 	 * holding a reference to the 'page' at this point. If we are not, then  in balloon_page_enqueue_one()
23 	BUG_ON(!trylock_page(page));  in balloon_page_enqueue_one()
24 	balloon_page_insert(b_dev_info, page);  in balloon_page_enqueue_one()
25 	unlock_page(page);  in balloon_page_enqueue_one()
27 	inc_node_page_state(page, NR_BALLOON_PAGES);  in balloon_page_enqueue_one()
31  * balloon_page_list_enqueue() - inserts a list of pages into the balloon page
33  * @b_dev_info: balloon device descriptor where we will insert a new page to
44 	struct page *page, *tmp;  in balloon_page_list_enqueue()  local
49 	list_for_each_entry_safe(page, tmp, pages, lru) {  in balloon_page_list_enqueue()
50 		list_del(&page->lru);  in balloon_page_list_enqueue()
51 		balloon_page_enqueue_one(b_dev_info, page);  in balloon_page_list_enqueue()
60  * balloon_page_list_dequeue() - removes pages from balloon's page list and
62  * @b_dev_info: balloon device descriptor where we will grab a page from.
72  * isn't empty - since the page list can be temporarily empty due to compaction
80 	struct page *page, *tmp;  in balloon_page_list_dequeue()  local
85 	list_for_each_entry_safe(page, tmp, &b_dev_info->pages, lru) {  in balloon_page_list_dequeue()
90 		 * Block others from accessing the 'page' while we get around to  in balloon_page_list_dequeue()
91 		 * establishing additional references and preparing the 'page'  in balloon_page_list_dequeue()
94 		if (!trylock_page(page))  in balloon_page_list_dequeue()
98 		    PageIsolated(page)) {  in balloon_page_list_dequeue()
100 			unlock_page(page);  in balloon_page_list_dequeue()
103 		balloon_page_delete(page);  in balloon_page_list_dequeue()
105 		list_add(&page->lru, pages);  in balloon_page_list_dequeue()
106 		unlock_page(page);  in balloon_page_list_dequeue()
107 		dec_node_page_state(page, NR_BALLOON_PAGES);  in balloon_page_list_dequeue()
117  * balloon_page_alloc - allocates a new page for insertion into the balloon
118  *			page list.
120  * Driver must call this function to properly allocate a new balloon page.
121  * Driver must call balloon_page_enqueue before definitively removing the page
124  * Return: struct page for the allocated page or NULL on allocation failure.
126 struct page *balloon_page_alloc(void)  in balloon_page_alloc()
128 	struct page *page = alloc_page(balloon_mapping_gfp_mask() |  in balloon_page_alloc()  local
131 	return page;  in balloon_page_alloc()
136  * balloon_page_enqueue - inserts a new page into the balloon page list.
138  * @b_dev_info: balloon device descriptor where we will insert a new page
139  * @page: new page to enqueue - allocated using balloon_page_alloc.
142  * page before definitively removing the page from the guest system.
149 			  struct page *page)  in balloon_page_enqueue()  argument
154 	balloon_page_enqueue_one(b_dev_info, page);  in balloon_page_enqueue()
160  * balloon_page_dequeue - removes a page from balloon's page list and returns
161  *			  its address to allow the driver to release the page.
162  * @b_dev_info: balloon device descriptor where we will grab a page from.
164  * Driver must call this function to properly dequeue a previously enqueued page
171  * some enqueued pages - since the page list can be temporarily empty due to
177  * Return: struct page for the dequeued page, or NULL if no page was dequeued.
179 struct page *balloon_page_dequeue(struct balloon_dev_info *b_dev_info)  in balloon_page_dequeue()
189 		 * If we are unable to dequeue a balloon page because the page  in balloon_page_dequeue()
202 	return list_first_entry(&pages, struct page, lru);  in balloon_page_dequeue()
208 static bool balloon_page_isolate(struct page *page, isolate_mode_t mode)  in balloon_page_isolate()  argument
211 	struct balloon_dev_info *b_dev_info = balloon_page_device(page);  in balloon_page_isolate()
215 	list_del(&page->lru);  in balloon_page_isolate()
222 static void balloon_page_putback(struct page *page)  in balloon_page_putback()  argument
224 	struct balloon_dev_info *b_dev_info = balloon_page_device(page);  in balloon_page_putback()
228 	list_add(&page->lru, &b_dev_info->pages);  in balloon_page_putback()
233 /* move_to_new_page() counterpart for a ballooned page */
234 static int balloon_page_migrate(struct page *newpage, struct page *page,  in balloon_page_migrate()  argument
237 	struct balloon_dev_info *balloon = balloon_page_device(page);  in balloon_page_migrate()
239 	VM_BUG_ON_PAGE(!PageLocked(page), page);  in balloon_page_migrate()
242 	return balloon->migratepage(balloon, newpage, page, mode);  in balloon_page_migrate()