5  * Common interface for making balloon pages movable by compaction.
30  * balloon_page_list_enqueue() - inserts a list of pages into the balloon page
33  * @pages: pages to enqueue - allocated using balloon_page_alloc.
35  * Driver must call this function to properly enqueue balloon pages before
38  * Return: number of pages that were enqueued.
41 				 struct list_head *pages)  in balloon_page_list_enqueue()  argument
48 	list_for_each_entry_safe(page, tmp, pages, lru) {  in balloon_page_list_enqueue()
59  * balloon_page_list_dequeue() - removes pages from balloon's page list and
60  *				 returns a list of the pages.
62  * @pages: pointer to the list of pages that would be returned to the caller.
63  * @n_req_pages: number of requested pages.
66  * balloon pages before definitively releasing it back to the guest system.
67  * This function tries to remove @n_req_pages from the ballooned pages and
68  * return them to the caller in the @pages list.
70  * Note that this function may fail to dequeue some pages even if the balloon
72  * of isolated pages.
74  * Return: number of pages that were added to the @pages list.
77 				 struct list_head *pages, size_t n_req_pages)  in balloon_page_list_dequeue()  argument
84 	list_for_each_entry_safe(page, tmp, &b_dev_info->pages, lru) {  in balloon_page_list_dequeue()
104 		list_add(&page->lru, pages);  in balloon_page_list_dequeue()
142  * Drivers must not call balloon_page_enqueue on pages that have been pushed to
144  * enqueue a list of pages, use balloon_page_list_enqueue instead.
166  * function is called only if some pages are actually enqueued.
168  * Note that this function may fail to dequeue some pages even if there are
169  * some enqueued pages - since the page list can be temporarily empty due to
170  * the compaction of isolated pages.
173  * until all pages can be dequeued.
180 	LIST_HEAD(pages);  in balloon_page_dequeue()
183 	n_pages = balloon_page_list_dequeue(b_dev_info, &pages, 1);  in balloon_page_dequeue()
188 		 * list is empty and there are no isolated pages, then something  in balloon_page_dequeue()
189 		 * went out of track and some balloon pages are lost.  in balloon_page_dequeue()
191 		 * an infinite loop while attempting to release all its pages.  in balloon_page_dequeue()
194 		if (unlikely(list_empty(&b_dev_info->pages) &&  in balloon_page_dequeue()
200 	return list_first_entry(&pages, struct page, lru);  in balloon_page_dequeue()
226 	list_add(&page->lru, &b_dev_info->pages);  in balloon_page_putback()
241 	 * is unlikely to be used with balloon pages. See include/linux/hmm.h  in balloon_page_migrate()