1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_MM_PAGE_IDLE_H
3 #define _LINUX_MM_PAGE_IDLE_H
5 #include <linux/bitops.h>
6 #include <linux/page-flags.h>
7 #include <linux/page_ext.h>
9 #ifdef CONFIG_PAGE_IDLE_FLAG
13 * If there is not enough space to store Idle and Young bits in page flags, use
14 * page ext flags instead.
17 static inline bool folio_test_young(struct folio *folio)
19 struct page_ext *page_ext = lookup_page_ext(&folio->page);
21 if (unlikely(!page_ext))
24 return test_bit(PAGE_EXT_YOUNG, &page_ext->flags);
27 static inline void folio_set_young(struct folio *folio)
29 struct page_ext *page_ext = lookup_page_ext(&folio->page);
31 if (unlikely(!page_ext))
34 set_bit(PAGE_EXT_YOUNG, &page_ext->flags);
37 static inline bool folio_test_clear_young(struct folio *folio)
39 struct page_ext *page_ext = lookup_page_ext(&folio->page);
41 if (unlikely(!page_ext))
44 return test_and_clear_bit(PAGE_EXT_YOUNG, &page_ext->flags);
47 static inline bool folio_test_idle(struct folio *folio)
49 struct page_ext *page_ext = lookup_page_ext(&folio->page);
51 if (unlikely(!page_ext))
54 return test_bit(PAGE_EXT_IDLE, &page_ext->flags);
57 static inline void folio_set_idle(struct folio *folio)
59 struct page_ext *page_ext = lookup_page_ext(&folio->page);
61 if (unlikely(!page_ext))
64 set_bit(PAGE_EXT_IDLE, &page_ext->flags);
67 static inline void folio_clear_idle(struct folio *folio)
69 struct page_ext *page_ext = lookup_page_ext(&folio->page);
71 if (unlikely(!page_ext))
74 clear_bit(PAGE_EXT_IDLE, &page_ext->flags);
76 #endif /* !CONFIG_64BIT */
78 #else /* !CONFIG_PAGE_IDLE_FLAG */
80 static inline bool folio_test_young(struct folio *folio)
85 static inline void folio_set_young(struct folio *folio)
89 static inline bool folio_test_clear_young(struct folio *folio)
94 static inline bool folio_test_idle(struct folio *folio)
99 static inline void folio_set_idle(struct folio *folio)
103 static inline void folio_clear_idle(struct folio *folio)
107 #endif /* CONFIG_PAGE_IDLE_FLAG */
109 static inline bool page_is_young(struct page *page)
111 return folio_test_young(page_folio(page));
114 static inline void set_page_young(struct page *page)
116 folio_set_young(page_folio(page));
119 static inline bool test_and_clear_page_young(struct page *page)
121 return folio_test_clear_young(page_folio(page));
124 static inline bool page_is_idle(struct page *page)
126 return folio_test_idle(page_folio(page));
129 static inline void set_page_idle(struct page *page)
131 folio_set_idle(page_folio(page));
134 static inline void clear_page_idle(struct page *page)
136 folio_clear_idle(page_folio(page));
138 #endif /* _LINUX_MM_PAGE_IDLE_H */