1 files changed, 8 insertions, 1 deletions

diff --git a/mm/migrate.c b/mm/migrate.c
index 4e0eccca5e26..449d77d409f5 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -383,7 +383,14 @@ static void migrate_page_copy(struct page *newpage, struct page *page)
 
         if (PageDirty(page)) {
                 clear_page_dirty_for_io(page);
-                set_page_dirty(newpage);
+                /*
+                 * Want to mark the page and the radix tree as dirty, and
+                 * redo the accounting that clear_page_dirty_for_io undid,
+                 * but we can't use set_page_dirty because that function
+                 * is actually a signal that all of the page has become dirty.
+                 * Wheras only part of our page may be dirty.
+                 */
+                __set_page_dirty_nobuffers(newpage);
         }
 
 #ifdef CONFIG_SWAP