include/linux/migrate.h

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