1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_MM_PAGE_IDLE_H
3 #define _LINUX_MM_PAGE_IDLE_H
4 
5 #include <linux/bitops.h>
6 #include <linux/page-flags.h>
7 #include <linux/page_ext.h>
8 
9 #if defined(CONFIG_PAGE_IDLE_FLAG) && !defined(CONFIG_64BIT)
10 /*
11  * If there is not enough space to store Idle and Young bits in page flags, use
12  * page ext flags instead.
13  */
folio_test_young(const struct folio * folio)14 static inline bool folio_test_young(const struct folio *folio)
15 {
16 	struct page_ext *page_ext = page_ext_get(&folio->page);
17 	bool page_young;
18 
19 	if (unlikely(!page_ext))
20 		return false;
21 
22 	page_young = test_bit(PAGE_EXT_YOUNG, &page_ext->flags);
23 	page_ext_put(page_ext);
24 
25 	return page_young;
26 }
27 
folio_set_young(struct folio * folio)28 static inline void folio_set_young(struct folio *folio)
29 {
30 	struct page_ext *page_ext = page_ext_get(&folio->page);
31 
32 	if (unlikely(!page_ext))
33 		return;
34 
35 	set_bit(PAGE_EXT_YOUNG, &page_ext->flags);
36 	page_ext_put(page_ext);
37 }
38 
folio_test_clear_young(struct folio * folio)39 static inline bool folio_test_clear_young(struct folio *folio)
40 {
41 	struct page_ext *page_ext = page_ext_get(&folio->page);
42 	bool page_young;
43 
44 	if (unlikely(!page_ext))
45 		return false;
46 
47 	page_young = test_and_clear_bit(PAGE_EXT_YOUNG, &page_ext->flags);
48 	page_ext_put(page_ext);
49 
50 	return page_young;
51 }
52 
folio_test_idle(const struct folio * folio)53 static inline bool folio_test_idle(const struct folio *folio)
54 {
55 	struct page_ext *page_ext = page_ext_get(&folio->page);
56 	bool page_idle;
57 
58 	if (unlikely(!page_ext))
59 		return false;
60 
61 	page_idle = test_bit(PAGE_EXT_IDLE, &page_ext->flags);
62 	page_ext_put(page_ext);
63 
64 	return page_idle;
65 }
66 
folio_set_idle(struct folio * folio)67 static inline void folio_set_idle(struct folio *folio)
68 {
69 	struct page_ext *page_ext = page_ext_get(&folio->page);
70 
71 	if (unlikely(!page_ext))
72 		return;
73 
74 	set_bit(PAGE_EXT_IDLE, &page_ext->flags);
75 	page_ext_put(page_ext);
76 }
77 
folio_clear_idle(struct folio * folio)78 static inline void folio_clear_idle(struct folio *folio)
79 {
80 	struct page_ext *page_ext = page_ext_get(&folio->page);
81 
82 	if (unlikely(!page_ext))
83 		return;
84 
85 	clear_bit(PAGE_EXT_IDLE, &page_ext->flags);
86 	page_ext_put(page_ext);
87 }
88 #endif /* CONFIG_PAGE_IDLE_FLAG && !64BIT */
89 #endif /* _LINUX_MM_PAGE_IDLE_H */
90