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 void 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,
  16                         unsigned long private, int offlining);
  17
  18 extern int fail_migrate_page(struct address_space *,
  19                         struct page *, struct page *);
  20
  21 extern int migrate_prep(void);
  22 extern int migrate_vmas(struct mm_struct *mm,
  23                 const nodemask_t *from, const nodemask_t *to,
  24                 unsigned long flags);
  25 #else
  26 #define PAGE_MIGRATION 0
  27
  28 static inline void putback_lru_pages(struct list_head *l) {}
  29 static inline int migrate_pages(struct list_head *l, new_page_t x,
  30                 unsigned long private, int offlining) { return -ENOSYS; }
  31
  32 static inline int migrate_prep(void) { return -ENOSYS; }
  33
  34 static inline int migrate_vmas(struct mm_struct *mm,
  35                 const nodemask_t *from, const nodemask_t *to,
  36                 unsigned long flags)
  37 {
  38         return -ENOSYS;
  39 }
  40
  41 /* Possible settings for the migrate_page() method in address_operations */
  42 #define migrate_page NULL
  43 #define fail_migrate_page NULL
  44
  45 #endif /* CONFIG_MIGRATION */
  46 #endif /* _LINUX_MIGRATE_H */