1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __LINUX_PAGE_EXT_H
3 #define __LINUX_PAGE_EXT_H
5 #include <linux/types.h>
6 #include <linux/stacktrace.h>
7 #include <linux/stackdepot.h>
10 struct page_ext_operations {
17 #ifdef CONFIG_PAGE_EXTENSION
21 #if defined(CONFIG_IDLE_PAGE_TRACKING) && !defined(CONFIG_64BIT)
28 * Page Extension can be considered as an extended mem_map.
29 * A page_ext page is associated with every page descriptor. The
30 * page_ext helps us add more information about the page.
31 * All page_ext are allocated at boot or memory hotplug event,
32 * then the page_ext for pfn always exists.
38 extern void pgdat_page_ext_init(struct pglist_data *pgdat);
40 #ifdef CONFIG_SPARSEMEM
41 static inline void page_ext_init_flatmem(void)
44 extern void page_ext_init(void);
46 extern void page_ext_init_flatmem(void);
47 static inline void page_ext_init(void)
52 struct page_ext *lookup_page_ext(const struct page *page);
54 #else /* !CONFIG_PAGE_EXTENSION */
57 static inline void pgdat_page_ext_init(struct pglist_data *pgdat)
61 static inline struct page_ext *lookup_page_ext(const struct page *page)
66 static inline void page_ext_init(void)
70 static inline void page_ext_init_flatmem(void)
73 #endif /* CONFIG_PAGE_EXTENSION */
74 #endif /* __LINUX_PAGE_EXT_H */