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git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - include/linux/page_ext.h
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 PAGE_EXT_OWNER_ALLOCATED
,
22 #if defined(CONFIG_IDLE_PAGE_TRACKING) && !defined(CONFIG_64BIT)
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.
39 extern unsigned long page_ext_size
;
40 extern void pgdat_page_ext_init(struct pglist_data
*pgdat
);
42 #ifdef CONFIG_SPARSEMEM
43 static inline void page_ext_init_flatmem(void)
46 extern void page_ext_init(void);
48 extern void page_ext_init_flatmem(void);
49 static inline void page_ext_init(void)
54 struct page_ext
*lookup_page_ext(const struct page
*page
);
56 static inline struct page_ext
*page_ext_next(struct page_ext
*curr
)
59 next
+= page_ext_size
;
63 #else /* !CONFIG_PAGE_EXTENSION */
66 static inline void pgdat_page_ext_init(struct pglist_data
*pgdat
)
70 static inline struct page_ext
*lookup_page_ext(const struct page
*page
)
75 static inline void page_ext_init(void)
79 static inline void page_ext_init_flatmem(void)
82 #endif /* CONFIG_PAGE_EXTENSION */
83 #endif /* __LINUX_PAGE_EXT_H */