Index: linux-2.6.15-rc1-ck1/include/linux/ioprio.h
===================================================================
--- linux-2.6.15-rc1-ck1.orig/include/linux/ioprio.h	2005-11-12 20:58:05.000000000 +1100
+++ linux-2.6.15-rc1-ck1/include/linux/ioprio.h	2005-11-12 20:58:05.000000000 +1100
@@ -57,7 +57,7 @@ static inline int task_nice_ioprio(struc
 
 	if (batch_task(task))
 		effective_nice = 19;
-	else if (iso_task(task))
+	else if (rt_task(task) || iso_task(task))
 		effective_nice = -20;
 	return (effective_nice + 20) / 5;
 }