1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef LINUX_MM_INLINE_H
3 #define LINUX_MM_INLINE_H
5 #include <linux/huge_mm.h>
6 #include <linux/swap.h>
9 * page_is_file_cache - should the page be on a file LRU or anon LRU?
10 * @page: the page to test
12 * Returns 1 if @page is page cache page backed by a regular filesystem,
13 * or 0 if @page is anonymous, tmpfs or otherwise ram or swap backed.
14 * Used by functions that manipulate the LRU lists, to sort a page
15 * onto the right LRU list.
17 * We would like to get this info without a page flag, but the state
18 * needs to survive until the page is last deleted from the LRU, which
19 * could be as far down as __page_cache_release.
21 static inline int page_is_file_cache(struct page *page)
23 return !PageSwapBacked(page);
26 static __always_inline void __update_lru_size(struct lruvec *lruvec,
27 enum lru_list lru, enum zone_type zid,
30 struct pglist_data *pgdat = lruvec_pgdat(lruvec);
32 __mod_node_page_state(pgdat, NR_LRU_BASE + lru, nr_pages);
33 __mod_zone_page_state(&pgdat->node_zones[zid],
34 NR_ZONE_LRU_BASE + lru, nr_pages);
37 static __always_inline void update_lru_size(struct lruvec *lruvec,
38 enum lru_list lru, enum zone_type zid,
41 __update_lru_size(lruvec, lru, zid, nr_pages);
43 mem_cgroup_update_lru_size(lruvec, lru, zid, nr_pages);
47 static __always_inline void add_page_to_lru_list(struct page *page,
48 struct lruvec *lruvec, enum lru_list lru)
50 update_lru_size(lruvec, lru, page_zonenum(page), hpage_nr_pages(page));
51 list_add(&page->lru, &lruvec->lists[lru]);
54 static __always_inline void add_page_to_lru_list_tail(struct page *page,
55 struct lruvec *lruvec, enum lru_list lru)
57 update_lru_size(lruvec, lru, page_zonenum(page), hpage_nr_pages(page));
58 list_add_tail(&page->lru, &lruvec->lists[lru]);
61 static __always_inline void del_page_from_lru_list(struct page *page,
62 struct lruvec *lruvec, enum lru_list lru)
65 update_lru_size(lruvec, lru, page_zonenum(page), -hpage_nr_pages(page));
69 * page_lru_base_type - which LRU list type should a page be on?
70 * @page: the page to test
72 * Used for LRU list index arithmetic.
74 * Returns the base LRU type - file or anon - @page should be on.
76 static inline enum lru_list page_lru_base_type(struct page *page)
78 if (page_is_file_cache(page))
79 return LRU_INACTIVE_FILE;
80 return LRU_INACTIVE_ANON;
84 * page_off_lru - which LRU list was page on? clearing its lru flags.
85 * @page: the page to test
87 * Returns the LRU list a page was on, as an index into the array of LRU
88 * lists; and clears its Unevictable or Active flags, ready for freeing.
90 static __always_inline enum lru_list page_off_lru(struct page *page)
94 if (PageUnevictable(page)) {
95 __ClearPageUnevictable(page);
96 lru = LRU_UNEVICTABLE;
98 lru = page_lru_base_type(page);
99 if (PageActive(page)) {
100 __ClearPageActive(page);
108 * page_lru - which LRU list should a page be on?
109 * @page: the page to test
111 * Returns the LRU list a page should be on, as an index
112 * into the array of LRU lists.
114 static __always_inline enum lru_list page_lru(struct page *page)
118 if (PageUnevictable(page))
119 lru = LRU_UNEVICTABLE;
121 lru = page_lru_base_type(page);
122 if (PageActive(page))
128 #define lru_to_page(head) (list_entry((head)->prev, struct page, lru))
130 #ifdef arch_unmap_kpfn
131 extern void arch_unmap_kpfn(unsigned long pfn);
133 static __always_inline void arch_unmap_kpfn(unsigned long pfn) { }