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 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 static inline int putback_lru_pages(struct list_head *l) { return 0; }
  24 static inline int migrate_pages(struct list_head *l, new_page_t x,
  25                 unsigned long private) { return -ENOSYS; }
  26
  27 static inline int migrate_pages_to(struct list_head *pagelist,
  28                         struct vm_area_struct *vma, int dest) { return 0; }
  29
  30 static inline int migrate_prep(void) { return -ENOSYS; }
  31
  32 static inline int migrate_vmas(struct mm_struct *mm,
  33                 const nodemask_t *from, const nodemask_t *to,
  34                 unsigned long flags)
  35 {
  36         return -ENOSYS;
  37 }
  38
  39 /* Possible settings for the migrate_page() method in address_operations */
  40 #define migrate_page NULL
  41 #define fail_migrate_page NULL
  42
  43 #endif /* CONFIG_MIGRATION */
  44 #endif /* _LINUX_MIGRATE_H */