1 files changed, 20 insertions, 10 deletions

diff --git a/include/linux/migrate.h b/include/linux/migrate.h
index 3ef77f52a4f0..6241a1596a75 100644
--- a/include/linux/migrate.h
+++ b/include/linux/migrate.h
@@ -18,6 +18,7 @@ struct migration_target_control;
  * - zero on page migration success;
  */
 #define MIGRATEPAGE_SUCCESS		0
+#define MIGRATEPAGE_UNMAP		1
 
 /**
  * struct movable_operations - Driver page migration
@@ -61,16 +62,16 @@ extern const char *migrate_reason_names[MR_TYPES];
 
 #ifdef CONFIG_MIGRATION
 
-extern void putback_movable_pages(struct list_head *l);
+void putback_movable_pages(struct list_head *l);
 int migrate_folio_extra(struct address_space *mapping, struct folio *dst,
 		struct folio *src, enum migrate_mode mode, int extra_count);
 int migrate_folio(struct address_space *mapping, struct folio *dst,
 		struct folio *src, enum migrate_mode mode);
-extern int migrate_pages(struct list_head *l, new_page_t new, free_page_t free,
-		unsigned long private, enum migrate_mode mode, int reason,
-		unsigned int *ret_succeeded);
-extern struct page *alloc_migration_target(struct page *page, unsigned long private);
-extern int isolate_movable_page(struct page *page, isolate_mode_t mode);
+int migrate_pages(struct list_head *l, new_page_t new, free_page_t free,
+		  unsigned long private, enum migrate_mode mode, int reason,
+		  unsigned int *ret_succeeded);
+struct page *alloc_migration_target(struct page *page, unsigned long private);
+bool isolate_movable_page(struct page *page, isolate_mode_t mode);
 
 int migrate_huge_page_move_mapping(struct address_space *mapping,
 		struct folio *dst, struct folio *src);
@@ -91,8 +92,8 @@ static inline int migrate_pages(struct list_head *l, new_page_t new,
 static inline struct page *alloc_migration_target(struct page *page,
 		unsigned long private)
 	{ return NULL; }
-static inline int isolate_movable_page(struct page *page, isolate_mode_t mode)
-	{ return -EBUSY; }
+static inline bool isolate_movable_page(struct page *page, isolate_mode_t mode)
+	{ return false; }
 
 static inline int migrate_huge_page_move_mapping(struct address_space *mapping,
 				  struct folio *dst, struct folio *src)
@@ -123,6 +124,15 @@ static inline bool folio_test_movable(struct folio *folio)
 }
 
 static inline
+const struct movable_operations *folio_movable_ops(struct folio *folio)
+{
+	VM_BUG_ON(!__folio_test_movable(folio));
+
+	return (const struct movable_operations *)
+		((unsigned long)folio->mapping - PAGE_MAPPING_MOVABLE);
+}
+
+static inline
 const struct movable_operations *page_movable_ops(struct page *page)
 {
 	VM_BUG_ON(!__PageMovable(page));
@@ -132,8 +142,8 @@ const struct movable_operations *page_movable_ops(struct page *page)
 }
 
 #ifdef CONFIG_NUMA_BALANCING
-extern int migrate_misplaced_page(struct page *page,
-				  struct vm_area_struct *vma, int node);
+int migrate_misplaced_page(struct page *page, struct vm_area_struct *vma,
+			   int node);
 #else
 static inline int migrate_misplaced_page(struct page *page,
 					 struct vm_area_struct *vma, int node)