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 */
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
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
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
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
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
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
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