No need to lock kcopyd pages.

--- diff/drivers/md/kcopyd.c	2004-06-11 19:26:23.000000000 +0100
+++ source/drivers/md/kcopyd.c	2004-06-11 19:26:46.000000000 +0100
@@ -62,13 +62,11 @@
 		return NULL;
 	}
 
-	SetPageLocked(pl->page);
 	return pl;
 }
 
 static void free_pl(struct page_list *pl)
 {
-	ClearPageLocked(pl->page);
 	__free_page(pl->page);
 	kfree(pl);
 }