page_idle.h

 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 */
14static 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
28static 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
39static 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
53static 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
67static 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
78static 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 */