linux/include/linux/migrate.h
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   1#ifndef _LINUX_MIGRATE_H
   2#define _LINUX_MIGRATE_H
   3
   4#include <linux/mm.h>
   5#include <linux/mempolicy.h>
   6#include <linux/migrate_mode.h>
   7
   8typedef struct page *new_page_t(struct page *, unsigned long private, int **);
   9
  10#ifdef CONFIG_MIGRATION
  11
  12extern void putback_lru_pages(struct list_head *l);
  13extern int migrate_page(struct address_space *,
  14                        struct page *, struct page *, enum migrate_mode);
  15extern int migrate_pages(struct list_head *l, new_page_t x,
  16                        unsigned long private, bool offlining,
  17                        enum migrate_mode mode);
  18extern int migrate_huge_page(struct page *, new_page_t x,
  19                        unsigned long private, bool offlining,
  20                        enum migrate_mode mode);
  21
  22extern int fail_migrate_page(struct address_space *,
  23                        struct page *, struct page *);
  24
  25extern int migrate_prep(void);
  26extern int migrate_prep_local(void);
  27extern int migrate_vmas(struct mm_struct *mm,
  28                const nodemask_t *from, const nodemask_t *to,
  29                unsigned long flags);
  30extern void migrate_page_copy(struct page *newpage, struct page *page);
  31extern int migrate_huge_page_move_mapping(struct address_space *mapping,
  32                                  struct page *newpage, struct page *page);
  33#else
  34
  35static inline void putback_lru_pages(struct list_head *l) {}
  36static inline int migrate_pages(struct list_head *l, new_page_t x,
  37                unsigned long private, bool offlining,
  38                enum migrate_mode mode) { return -ENOSYS; }
  39static inline int migrate_huge_page(struct page *page, new_page_t x,
  40                unsigned long private, bool offlining,
  41                enum migrate_mode mode) { return -ENOSYS; }
  42
  43static inline int migrate_prep(void) { return -ENOSYS; }
  44static inline int migrate_prep_local(void) { return -ENOSYS; }
  45
  46static inline int migrate_vmas(struct mm_struct *mm,
  47                const nodemask_t *from, const nodemask_t *to,
  48                unsigned long flags)
  49{
  50        return -ENOSYS;
  51}
  52
  53static inline void migrate_page_copy(struct page *newpage,
  54                                     struct page *page) {}
  55
  56static inline int migrate_huge_page_move_mapping(struct address_space *mapping,
  57                                  struct page *newpage, struct page *page)
  58{
  59        return -ENOSYS;
  60}
  61
  62/* Possible settings for the migrate_page() method in address_operations */
  63#define migrate_page NULL
  64#define fail_migrate_page NULL
  65
  66#endif /* CONFIG_MIGRATION */
  67#endif /* _LINUX_MIGRATE_H */
  68
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