Index: linux-2.6.12-rc3/include/linux/ioprio.h
===================================================================
--- linux-2.6.12-rc3.orig/include/linux/ioprio.h	2005-04-21 17:17:39.000000000 +1000
+++ linux-2.6.12-rc3/include/linux/ioprio.h	2005-04-21 17:17:39.000000000 +1000
@@ -53,7 +53,7 @@ static inline int task_nice_ioprio(struc
 
 	if (batch_task(task))
 		effective_nice = 19;
-	else if (iso_task(task))
+	else if (iso_task(task) || rt_task(task))
 		effective_nice = -20;
 	return (effective_nice + 20) / 5;
 }