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-rw-r--r--include/linux/migrate.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/migrate.h b/include/linux/migrate.h
index ce7e6671968..a4e886d17f8 100644
--- a/include/linux/migrate.h
+++ b/include/linux/migrate.h
@@ -7,6 +7,13 @@
typedef struct page *new_page_t(struct page *, unsigned long private, int **);
+/*
+ * Return values from addresss_space_operations.migratepage():
+ * - negative errno on page migration failure;
+ * - zero on page migration success;
+ */
+#define MIGRATEPAGE_SUCCESS 0
+
#ifdef CONFIG_MIGRATION
extern void putback_lru_pages(struct list_head *l);