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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef LINUX_MM_INLINE_H
3#define LINUX_MM_INLINE_H
4
5#include <linux/huge_mm.h>
6#include <linux/swap.h>
7
8/**
9 * folio_is_file_lru - Should the folio be on a file LRU or anon LRU?
10 * @folio: The folio to test.
11 *
12 * We would like to get this info without a page flag, but the state
13 * needs to survive until the folio is last deleted from the LRU, which
14 * could be as far down as __page_cache_release.
15 *
16 * Return: An integer (not a boolean!) used to sort a folio onto the
17 * right LRU list and to account folios correctly.
18 * 1 if @folio is a regular filesystem backed page cache folio
19 * or a lazily freed anonymous folio (e.g. via MADV_FREE).
20 * 0 if @folio is a normal anonymous folio, a tmpfs folio or otherwise
21 * ram or swap backed folio.
22 */
23static inline int folio_is_file_lru(struct folio *folio)
24{
25 return !folio_test_swapbacked(folio);
26}
27
28static inline int page_is_file_lru(struct page *page)
29{
30 return folio_is_file_lru(page_folio(page));
31}
32
33static __always_inline void update_lru_size(struct lruvec *lruvec,
34 enum lru_list lru, enum zone_type zid,
35 long nr_pages)
36{
37 struct pglist_data *pgdat = lruvec_pgdat(lruvec);
38
39 __mod_lruvec_state(lruvec, NR_LRU_BASE + lru, nr_pages);
40 __mod_zone_page_state(&pgdat->node_zones[zid],
41 NR_ZONE_LRU_BASE + lru, nr_pages);
42#ifdef CONFIG_MEMCG
43 mem_cgroup_update_lru_size(lruvec, lru, zid, nr_pages);
44#endif
45}
46
47/**
48 * __folio_clear_lru_flags - Clear page lru flags before releasing a page.
49 * @folio: The folio that was on lru and now has a zero reference.
50 */
51static __always_inline void __folio_clear_lru_flags(struct folio *folio)
52{
53 VM_BUG_ON_FOLIO(!folio_test_lru(folio), folio);
54
55 __folio_clear_lru(folio);
56
57 /* this shouldn't happen, so leave the flags to bad_page() */
58 if (folio_test_active(folio) && folio_test_unevictable(folio))
59 return;
60
61 __folio_clear_active(folio);
62 __folio_clear_unevictable(folio);
63}
64
65static __always_inline void __clear_page_lru_flags(struct page *page)
66{
67 __folio_clear_lru_flags(page_folio(page));
68}
69
70/**
71 * folio_lru_list - Which LRU list should a folio be on?
72 * @folio: The folio to test.
73 *
74 * Return: The LRU list a folio should be on, as an index
75 * into the array of LRU lists.
76 */
77static __always_inline enum lru_list folio_lru_list(struct folio *folio)
78{
79 enum lru_list lru;
80
81 VM_BUG_ON_FOLIO(folio_test_active(folio) && folio_test_unevictable(folio), folio);
82
83 if (folio_test_unevictable(folio))
84 return LRU_UNEVICTABLE;
85
86 lru = folio_is_file_lru(folio) ? LRU_INACTIVE_FILE : LRU_INACTIVE_ANON;
87 if (folio_test_active(folio))
88 lru += LRU_ACTIVE;
89
90 return lru;
91}
92
93static __always_inline
94void lruvec_add_folio(struct lruvec *lruvec, struct folio *folio)
95{
96 enum lru_list lru = folio_lru_list(folio);
97
98 update_lru_size(lruvec, lru, folio_zonenum(folio),
99 folio_nr_pages(folio));
100 list_add(&folio->lru, &lruvec->lists[lru]);
101}
102
103static __always_inline void add_page_to_lru_list(struct page *page,
104 struct lruvec *lruvec)
105{
106 lruvec_add_folio(lruvec, page_folio(page));
107}
108
109static __always_inline
110void lruvec_add_folio_tail(struct lruvec *lruvec, struct folio *folio)
111{
112 enum lru_list lru = folio_lru_list(folio);
113
114 update_lru_size(lruvec, lru, folio_zonenum(folio),
115 folio_nr_pages(folio));
116 list_add_tail(&folio->lru, &lruvec->lists[lru]);
117}
118
119static __always_inline void add_page_to_lru_list_tail(struct page *page,
120 struct lruvec *lruvec)
121{
122 lruvec_add_folio_tail(lruvec, page_folio(page));
123}
124
125static __always_inline
126void lruvec_del_folio(struct lruvec *lruvec, struct folio *folio)
127{
128 list_del(&folio->lru);
129 update_lru_size(lruvec, folio_lru_list(folio), folio_zonenum(folio),
130 -folio_nr_pages(folio));
131}
132
133static __always_inline void del_page_from_lru_list(struct page *page,
134 struct lruvec *lruvec)
135{
136 lruvec_del_folio(lruvec, page_folio(page));
137}
138#endif