blob: 61c0f05f90694701653d206009a79635f7b1f655 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
|
#ifndef __LINUX_PAGE_EXT_H
#define __LINUX_PAGE_EXT_H
struct pglist_data;
struct page_ext_operations {
bool (*need)(void);
void (*init)(void);
};
#ifdef CONFIG_PAGE_EXTENSION
/*
* page_ext->flags bits:
*
* PAGE_EXT_DEBUG_POISON is set for poisoned pages. This is used to
* implement generic debug pagealloc feature. The pages are filled with
* poison patterns and set this flag after free_pages(). The poisoned
* pages are verified whether the patterns are not corrupted and clear
* the flag before alloc_pages().
*/
enum page_ext_flags {
PAGE_EXT_DEBUG_POISON, /* Page is poisoned */
PAGE_EXT_DEBUG_GUARD,
};
/*
* Page Extension can be considered as an extended mem_map.
* A page_ext page is associated with every page descriptor. The
* page_ext helps us add more information about the page.
* All page_ext are allocated at boot or memory hotplug event,
* then the page_ext for pfn always exists.
*/
struct page_ext {
unsigned long flags;
};
extern void pgdat_page_ext_init(struct pglist_data *pgdat);
#ifdef CONFIG_SPARSEMEM
static inline void page_ext_init_flatmem(void)
{
}
extern void page_ext_init(void);
#else
extern void page_ext_init_flatmem(void);
static inline void page_ext_init(void)
{
}
#endif
struct page_ext *lookup_page_ext(struct page *page);
#else /* !CONFIG_PAGE_EXTENSION */
struct page_ext;
static inline void pgdat_page_ext_init(struct pglist_data *pgdat)
{
}
static inline struct page_ext *lookup_page_ext(struct page *page)
{
return NULL;
}
static inline void page_ext_init(void)
{
}
static inline void page_ext_init_flatmem(void)
{
}
#endif /* CONFIG_PAGE_EXTENSION */
#endif /* __LINUX_PAGE_EXT_H */
|
