1 #ifndef __LINUX_PAGE_EXT_H
2 #define __LINUX_PAGE_EXT_H
4 #include <linux/types.h>
5 #include <linux/stacktrace.h>
8 struct page_ext_operations
{
13 #ifdef CONFIG_PAGE_EXTENSION
16 * page_ext->flags bits:
18 * PAGE_EXT_DEBUG_POISON is set for poisoned pages. This is used to
19 * implement generic debug pagealloc feature. The pages are filled with
20 * poison patterns and set this flag after free_pages(). The poisoned
21 * pages are verified whether the patterns are not corrupted and clear
22 * the flag before alloc_pages().
26 PAGE_EXT_DEBUG_POISON
, /* Page is poisoned */
29 #if defined(CONFIG_IDLE_PAGE_TRACKING) && !defined(CONFIG_64BIT)
36 * Page Extension can be considered as an extended mem_map.
37 * A page_ext page is associated with every page descriptor. The
38 * page_ext helps us add more information about the page.
39 * All page_ext are allocated at boot or memory hotplug event,
40 * then the page_ext for pfn always exists.
44 #ifdef CONFIG_PAGE_OWNER
47 unsigned int nr_entries
;
48 int last_migrate_reason
;
49 unsigned long trace_entries
[8];
53 extern void pgdat_page_ext_init(struct pglist_data
*pgdat
);
55 #ifdef CONFIG_SPARSEMEM
56 static inline void page_ext_init_flatmem(void)
59 extern void page_ext_init(void);
61 extern void page_ext_init_flatmem(void);
62 static inline void page_ext_init(void)
67 struct page_ext
*lookup_page_ext(struct page
*page
);
69 #else /* !CONFIG_PAGE_EXTENSION */
72 static inline void pgdat_page_ext_init(struct pglist_data
*pgdat
)
76 static inline struct page_ext
*lookup_page_ext(struct page
*page
)
81 static inline void page_ext_init(void)
85 static inline void page_ext_init_flatmem(void)
88 #endif /* CONFIG_PAGE_EXTENSION */
89 #endif /* __LINUX_PAGE_EXT_H */
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