1 files changed, 44 insertions, 2 deletions

diff --git a/include/linux/migrate.h b/include/linux/migrate.h
index 0b5865c61efd..1e9f627967a3 100644
--- a/include/linux/migrate.h
+++ b/include/linux/migrate.h
@@ -23,6 +23,15 @@ typedef struct page *new_page_t(struct page *, unsigned long private, int **);
 #define MIGRATEPAGE_BALLOON_SUCCESS     1 /* special ret code for balloon page
                                            * sucessful migration case.
                                            */
+enum migrate_reason {
+        MR_COMPACTION,
+        MR_MEMORY_FAILURE,
+        MR_MEMORY_HOTPLUG,
+        MR_SYSCALL,             /* also applies to cpusets */
+        MR_MEMPOLICY_MBIND,
+        MR_NUMA_MISPLACED,
+        MR_CMA
+};
 
 #ifdef CONFIG_MIGRATION
 
@@ -32,7 +41,7 @@ extern int migrate_page(struct address_space *,
                         struct page *, struct page *, enum migrate_mode);
 extern int migrate_pages(struct list_head *l, new_page_t x,
                         unsigned long private, bool offlining,
-                        enum migrate_mode mode);
+                        enum migrate_mode mode, int reason);
 extern int migrate_huge_page(struct page *, new_page_t x,
                         unsigned long private, bool offlining,
                         enum migrate_mode mode);
@@ -54,7 +63,7 @@ static inline void putback_lru_pages(struct list_head *l) {}
 static inline void putback_movable_pages(struct list_head *l) {}
 static inline int migrate_pages(struct list_head *l, new_page_t x,
                 unsigned long private, bool offlining,
-                enum migrate_mode mode) { return -ENOSYS; }
+                enum migrate_mode mode, int reason) { return -ENOSYS; }
 static inline int migrate_huge_page(struct page *page, new_page_t x,
                 unsigned long private, bool offlining,
                 enum migrate_mode mode) { return -ENOSYS; }
@@ -83,4 +92,37 @@ static inline int migrate_huge_page_move_mapping(struct address_space *mapping,
 #define fail_migrate_page NULL
 
 #endif /* CONFIG_MIGRATION */
+
+#ifdef CONFIG_NUMA_BALANCING
+extern int migrate_misplaced_page(struct page *page, int node);
+extern int migrate_misplaced_page(struct page *page, int node);
+extern bool migrate_ratelimited(int node);
+#else
+static inline int migrate_misplaced_page(struct page *page, int node)
+{
+        return -EAGAIN; /* can't migrate now */
+}
+static inline bool migrate_ratelimited(int node)
+{
+        return false;
+}
+#endif /* CONFIG_NUMA_BALANCING */
+
+#if defined(CONFIG_NUMA_BALANCING) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
+extern int migrate_misplaced_transhuge_page(struct mm_struct *mm,
+                        struct vm_area_struct *vma,
+                        pmd_t *pmd, pmd_t entry,
+                        unsigned long address,
+                        struct page *page, int node);
+#else
+static inline int migrate_misplaced_transhuge_page(struct mm_struct *mm,
+                        struct vm_area_struct *vma,
+                        pmd_t *pmd, pmd_t entry,
+                        unsigned long address,
+                        struct page *page, int node)
+{
+        return -EAGAIN;
+}
+#endif /* CONFIG_NUMA_BALANCING && CONFIG_TRANSPARENT_HUGEPAGE*/
+
 #endif /* _LINUX_MIGRATE_H */