Merge branch 'for-2.6.26' of master.kernel.org:/pub/scm/linux/kernel/git/jwboyer/powerpc-4xx into merge

1 files changed, 8 insertions, 1 deletions

diff --git a/mm/migrate.c b/mm/migrate.c
index 4e0eccca5e2..449d77d409f 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