include/linux/migrate.h

   1 #ifndef _LINUX_MIGRATE_H
   2 #define _LINUX_MIGRATE_H
   3
   4 #include <linux/mm.h>
   5 #include <linux/mempolicy.h>
   6
   7 typedef struct page *new_page_t(struct page *, unsigned long private, int **);
   8
   9 #ifdef CONFIG_MIGRATION
  10 #define PAGE_MIGRATION 1
  11
  12 extern int putback_lru_pages(struct list_head *l);
  13 extern int migrate_page(struct address_space *,
  14                         struct page *, struct page *);
  15 extern int migrate_pages(struct list_head *l, new_page_t x, unsigned long);
  16
  17 extern int fail_migrate_page(struct address_space *,
  18                         struct page *, struct page *);
  19
  20 extern int migrate_prep(void);
  21 extern int migrate_vmas(struct mm_struct *mm,
  22                 const nodemask_t *from, const nodemask_t *to,
  23                 unsigned long flags);
  24 #else
  25 #define PAGE_MIGRATION 0
  26
  27 static inline int putback_lru_pages(struct list_head *l) { return 0; }
  28 static inline int migrate_pages(struct list_head *l, new_page_t x,
  29                 unsigned long private) { return -ENOSYS; }
  30
  31 static inline int migrate_pages_to(struct list_head *pagelist,
  32                         struct vm_area_struct *vma, int dest) { return 0; }
  33
  34 static inline int migrate_prep(void) { return -ENOSYS; }
  35
  36 static inline int migrate_vmas(struct mm_struct *mm,
  37                 const nodemask_t *from, const nodemask_t *to,
  38                 unsigned long flags)
  39 {
  40         return -ENOSYS;
  41 }
  42
  43 /* Possible settings for the migrate_page() method in address_operations */
  44 #define migrate_page NULL
  45 #define fail_migrate_page NULL
  46
  47 #endif /* CONFIG_MIGRATION */
  48 #endif /* _LINUX_MIGRATE_H */