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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
eefa864b JK |
2 | #ifndef __LINUX_PAGE_EXT_H |
3 | #define __LINUX_PAGE_EXT_H | |
4 | ||
48c96a36 JK |
5 | #include <linux/types.h> |
6 | #include <linux/stacktrace.h> | |
f2ca0b55 | 7 | #include <linux/stackdepot.h> |
48c96a36 | 8 | |
eefa864b JK |
9 | struct pglist_data; |
10 | struct page_ext_operations { | |
980ac167 JK |
11 | size_t offset; |
12 | size_t size; | |
eefa864b JK |
13 | bool (*need)(void); |
14 | void (*init)(void); | |
15 | }; | |
16 | ||
17 | #ifdef CONFIG_PAGE_EXTENSION | |
18 | ||
e30825f1 | 19 | enum page_ext_flags { |
48c96a36 | 20 | PAGE_EXT_OWNER, |
fdf3bf80 | 21 | PAGE_EXT_OWNER_ALLOCATED, |
1c676e0d | 22 | #if defined(CONFIG_PAGE_IDLE_FLAG) && !defined(CONFIG_64BIT) |
33c3fc71 VD |
23 | PAGE_EXT_YOUNG, |
24 | PAGE_EXT_IDLE, | |
25 | #endif | |
e30825f1 JK |
26 | }; |
27 | ||
eefa864b JK |
28 | /* |
29 | * Page Extension can be considered as an extended mem_map. | |
30 | * A page_ext page is associated with every page descriptor. The | |
31 | * page_ext helps us add more information about the page. | |
32 | * All page_ext are allocated at boot or memory hotplug event, | |
33 | * then the page_ext for pfn always exists. | |
34 | */ | |
35 | struct page_ext { | |
36 | unsigned long flags; | |
37 | }; | |
38 | ||
5556cfe8 | 39 | extern unsigned long page_ext_size; |
eefa864b JK |
40 | extern void pgdat_page_ext_init(struct pglist_data *pgdat); |
41 | ||
42 | #ifdef CONFIG_SPARSEMEM | |
43 | static inline void page_ext_init_flatmem(void) | |
44 | { | |
45 | } | |
46 | extern void page_ext_init(void); | |
7fb7ab6d ZH |
47 | static inline void page_ext_init_flatmem_late(void) |
48 | { | |
49 | } | |
eefa864b JK |
50 | #else |
51 | extern void page_ext_init_flatmem(void); | |
7fb7ab6d | 52 | extern void page_ext_init_flatmem_late(void); |
eefa864b JK |
53 | static inline void page_ext_init(void) |
54 | { | |
55 | } | |
56 | #endif | |
57 | ||
10ed6341 | 58 | struct page_ext *lookup_page_ext(const struct page *page); |
eefa864b | 59 | |
5556cfe8 VB |
60 | static inline struct page_ext *page_ext_next(struct page_ext *curr) |
61 | { | |
62 | void *next = curr; | |
63 | next += page_ext_size; | |
64 | return next; | |
65 | } | |
66 | ||
eefa864b JK |
67 | #else /* !CONFIG_PAGE_EXTENSION */ |
68 | struct page_ext; | |
69 | ||
70 | static inline void pgdat_page_ext_init(struct pglist_data *pgdat) | |
71 | { | |
72 | } | |
73 | ||
10ed6341 | 74 | static inline struct page_ext *lookup_page_ext(const struct page *page) |
eefa864b JK |
75 | { |
76 | return NULL; | |
77 | } | |
78 | ||
79 | static inline void page_ext_init(void) | |
80 | { | |
81 | } | |
82 | ||
7fb7ab6d ZH |
83 | static inline void page_ext_init_flatmem_late(void) |
84 | { | |
85 | } | |
86 | ||
eefa864b JK |
87 | static inline void page_ext_init_flatmem(void) |
88 | { | |
89 | } | |
90 | #endif /* CONFIG_PAGE_EXTENSION */ | |
91 | #endif /* __LINUX_PAGE_EXT_H */ |