9  * page_is_file_lru - should the page be on a file LRU or anon LRU?
10  * @page: the page to test
12  * Returns 1 if @page is a regular filesystem backed page cache page or a lazily
13  * freed anonymous page (e.g. via MADV_FREE).  Returns 0 if @page is a normal
14  * anonymous page, a tmpfs page or otherwise ram or swap backed page.  Used by
15  * functions that manipulate the LRU lists, to sort a page onto the right LRU
18  * We would like to get this info without a page flag, but the state
19  * needs to survive until the page is last deleted from the LRU, which
22 static inline int page_is_file_lru(struct page *page)  in page_is_file_lru()  argument
24 	return !PageSwapBacked(page);  in page_is_file_lru()
42  * __clear_page_lru_flags - clear page lru flags before releasing a page
43  * @page: the page that was on lru and now has a zero reference
45 static __always_inline void __clear_page_lru_flags(struct page *page)  in __clear_page_lru_flags()  argument
47 	VM_BUG_ON_PAGE(!PageLRU(page), page);  in __clear_page_lru_flags()
49 	__ClearPageLRU(page);  in __clear_page_lru_flags()
52 	if (PageActive(page) && PageUnevictable(page))  in __clear_page_lru_flags()
55 	__ClearPageActive(page);  in __clear_page_lru_flags()
56 	__ClearPageUnevictable(page);  in __clear_page_lru_flags()
60  * page_lru - which LRU list should a page be on?
61  * @page: the page to test
63  * Returns the LRU list a page should be on, as an index
66 static __always_inline enum lru_list page_lru(struct page *page)  in page_lru()  argument
70 	VM_BUG_ON_PAGE(PageActive(page) && PageUnevictable(page), page);  in page_lru()
72 	if (PageUnevictable(page))  in page_lru()
75 	lru = page_is_file_lru(page) ? LRU_INACTIVE_FILE : LRU_INACTIVE_ANON;  in page_lru()
76 	if (PageActive(page))  in page_lru()
82 static __always_inline void add_page_to_lru_list(struct page *page,  in add_page_to_lru_list()  argument
85 	enum lru_list lru = page_lru(page);  in add_page_to_lru_list()
87 	update_lru_size(lruvec, lru, page_zonenum(page), thp_nr_pages(page));  in add_page_to_lru_list()
88 	list_add(&page->lru, &lruvec->lists[lru]);  in add_page_to_lru_list()
91 static __always_inline void add_page_to_lru_list_tail(struct page *page,  in add_page_to_lru_list_tail()  argument
94 	enum lru_list lru = page_lru(page);  in add_page_to_lru_list_tail()
96 	update_lru_size(lruvec, lru, page_zonenum(page), thp_nr_pages(page));  in add_page_to_lru_list_tail()
97 	list_add_tail(&page->lru, &lruvec->lists[lru]);  in add_page_to_lru_list_tail()
100 static __always_inline void del_page_from_lru_list(struct page *page,  in del_page_from_lru_list()  argument
103 	list_del(&page->lru);  in del_page_from_lru_list()
104 	update_lru_size(lruvec, page_lru(page), page_zonenum(page),  in del_page_from_lru_list()
105 			-thp_nr_pages(page));  in del_page_from_lru_list()