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()
48 static __always_inline void add_page_to_lru_list(struct page *page,  in add_page_to_lru_list()  argument
51 	update_lru_size(lruvec, lru, page_zonenum(page), thp_nr_pages(page));  in add_page_to_lru_list()
52 	list_add(&page->lru, &lruvec->lists[lru]);  in add_page_to_lru_list()
55 static __always_inline void add_page_to_lru_list_tail(struct page *page,  in add_page_to_lru_list_tail()  argument
58 	update_lru_size(lruvec, lru, page_zonenum(page), thp_nr_pages(page));  in add_page_to_lru_list_tail()
59 	list_add_tail(&page->lru, &lruvec->lists[lru]);  in add_page_to_lru_list_tail()
62 static __always_inline void del_page_from_lru_list(struct page *page,  in del_page_from_lru_list()  argument
65 	list_del(&page->lru);  in del_page_from_lru_list()
66 	update_lru_size(lruvec, lru, page_zonenum(page), -thp_nr_pages(page));  in del_page_from_lru_list()
70  * page_lru_base_type - which LRU list type should a page be on?
71  * @page: the page to test
75  * Returns the base LRU type - file or anon - @page should be on.
77 static inline enum lru_list page_lru_base_type(struct page *page)  in page_lru_base_type()  argument
79 	if (page_is_file_lru(page))  in page_lru_base_type()
85  * page_off_lru - which LRU list was page on? clearing its lru flags.
86  * @page: the page to test
88  * Returns the LRU list a page was on, as an index into the array of LRU
91 static __always_inline enum lru_list page_off_lru(struct page *page)  in page_off_lru()  argument
95 	if (PageUnevictable(page)) {  in page_off_lru()
96 		__ClearPageUnevictable(page);  in page_off_lru()
99 		lru = page_lru_base_type(page);  in page_off_lru()
100 		if (PageActive(page)) {  in page_off_lru()
101 			__ClearPageActive(page);  in page_off_lru()
109  * page_lru - which LRU list should a page be on?
110  * @page: the page to test
112  * Returns the LRU list a page should be on, as an index
115 static __always_inline enum lru_list page_lru(struct page *page)  in page_lru()  argument
119 	if (PageUnevictable(page))  in page_lru()
122 		lru = page_lru_base_type(page);  in page_lru()
123 		if (PageActive(page))  in page_lru()