Commit | Line | Data |
---|---|---|
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 { |
e30825f1 | 20 | PAGE_EXT_DEBUG_GUARD, |
48c96a36 | 21 | PAGE_EXT_OWNER, |
33c3fc71 VD |
22 | #if defined(CONFIG_IDLE_PAGE_TRACKING) && !defined(CONFIG_64BIT) |
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 | ||
39 | extern void pgdat_page_ext_init(struct pglist_data *pgdat); | |
40 | ||
41 | #ifdef CONFIG_SPARSEMEM | |
42 | static inline void page_ext_init_flatmem(void) | |
43 | { | |
44 | } | |
45 | extern void page_ext_init(void); | |
46 | #else | |
47 | extern void page_ext_init_flatmem(void); | |
48 | static inline void page_ext_init(void) | |
49 | { | |
50 | } | |
51 | #endif | |
52 | ||
10ed6341 | 53 | struct page_ext *lookup_page_ext(const struct page *page); |
eefa864b JK |
54 | |
55 | #else /* !CONFIG_PAGE_EXTENSION */ | |
56 | struct page_ext; | |
57 | ||
58 | static inline void pgdat_page_ext_init(struct pglist_data *pgdat) | |
59 | { | |
60 | } | |
61 | ||
10ed6341 | 62 | static inline struct page_ext *lookup_page_ext(const struct page *page) |
eefa864b JK |
63 | { |
64 | return NULL; | |
65 | } | |
66 | ||
67 | static inline void page_ext_init(void) | |
68 | { | |
69 | } | |
70 | ||
71 | static inline void page_ext_init_flatmem(void) | |
72 | { | |
73 | } | |
74 | #endif /* CONFIG_PAGE_EXTENSION */ | |
75 | #endif /* __LINUX_PAGE_EXT_H */ |