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1 | #ifndef __LINUX_PAGE_EXT_H |
2 | #define __LINUX_PAGE_EXT_H | |
3 | ||
48c96a36 JK |
4 | #include <linux/types.h> |
5 | #include <linux/stacktrace.h> | |
f2ca0b55 | 6 | #include <linux/stackdepot.h> |
48c96a36 | 7 | |
eefa864b JK |
8 | struct pglist_data; |
9 | struct page_ext_operations { | |
980ac167 JK |
10 | size_t offset; |
11 | size_t size; | |
eefa864b JK |
12 | bool (*need)(void); |
13 | void (*init)(void); | |
14 | }; | |
15 | ||
16 | #ifdef CONFIG_PAGE_EXTENSION | |
17 | ||
e30825f1 JK |
18 | /* |
19 | * page_ext->flags bits: | |
20 | * | |
21 | * PAGE_EXT_DEBUG_POISON is set for poisoned pages. This is used to | |
22 | * implement generic debug pagealloc feature. The pages are filled with | |
23 | * poison patterns and set this flag after free_pages(). The poisoned | |
24 | * pages are verified whether the patterns are not corrupted and clear | |
25 | * the flag before alloc_pages(). | |
26 | */ | |
27 | ||
28 | enum page_ext_flags { | |
29 | PAGE_EXT_DEBUG_POISON, /* Page is poisoned */ | |
30 | PAGE_EXT_DEBUG_GUARD, | |
48c96a36 | 31 | PAGE_EXT_OWNER, |
33c3fc71 VD |
32 | #if defined(CONFIG_IDLE_PAGE_TRACKING) && !defined(CONFIG_64BIT) |
33 | PAGE_EXT_YOUNG, | |
34 | PAGE_EXT_IDLE, | |
35 | #endif | |
e30825f1 JK |
36 | }; |
37 | ||
eefa864b JK |
38 | /* |
39 | * Page Extension can be considered as an extended mem_map. | |
40 | * A page_ext page is associated with every page descriptor. The | |
41 | * page_ext helps us add more information about the page. | |
42 | * All page_ext are allocated at boot or memory hotplug event, | |
43 | * then the page_ext for pfn always exists. | |
44 | */ | |
45 | struct page_ext { | |
46 | unsigned long flags; | |
47 | }; | |
48 | ||
49 | extern void pgdat_page_ext_init(struct pglist_data *pgdat); | |
50 | ||
51 | #ifdef CONFIG_SPARSEMEM | |
52 | static inline void page_ext_init_flatmem(void) | |
53 | { | |
54 | } | |
55 | extern void page_ext_init(void); | |
56 | #else | |
57 | extern void page_ext_init_flatmem(void); | |
58 | static inline void page_ext_init(void) | |
59 | { | |
60 | } | |
61 | #endif | |
62 | ||
63 | struct page_ext *lookup_page_ext(struct page *page); | |
64 | ||
65 | #else /* !CONFIG_PAGE_EXTENSION */ | |
66 | struct page_ext; | |
67 | ||
68 | static inline void pgdat_page_ext_init(struct pglist_data *pgdat) | |
69 | { | |
70 | } | |
71 | ||
72 | static inline struct page_ext *lookup_page_ext(struct page *page) | |
73 | { | |
74 | return NULL; | |
75 | } | |
76 | ||
77 | static inline void page_ext_init(void) | |
78 | { | |
79 | } | |
80 | ||
81 | static inline void page_ext_init_flatmem(void) | |
82 | { | |
83 | } | |
84 | #endif /* CONFIG_PAGE_EXTENSION */ | |
85 | #endif /* __LINUX_PAGE_EXT_H */ |