Index: linux-2.6.19-rc2-mm1/kernel/sched.c
===================================================================
--- linux-2.6.19-rc2-mm1.orig/kernel/sched.c	2006-10-17 22:12:52.170884511 -0500
+++ linux-2.6.19-rc2-mm1/kernel/sched.c	2006-10-17 22:25:48.214844066 -0500
@@ -1608,9 +1608,10 @@ void fastcall sched_fork(struct task_str
 		 * runqueue lock is not a problem.
 		 */
 		current->time_slice = 1;
+		local_irq_enable();
 		scheduler_tick();
-	}
-	local_irq_enable();
+	} else
+		local_irq_enable();
 	put_cpu();
 }
 
@@ -3040,7 +3041,8 @@ void account_steal_time(struct task_stru
 
 /*
  * This function gets called by the timer code, with HZ frequency.
- * We call it with interrupts disabled.
+ * We call it with interrupts enabled. However, the thread is
+ * pinned to a specific cpu.
  *
  * It also gets called by the fork code, when changing the parent's
  * timeslices.
Index: linux-2.6.19-rc2-mm1/kernel/timer.c
===================================================================
--- linux-2.6.19-rc2-mm1.orig/kernel/timer.c	2006-10-17 22:13:04.761805079 -0500
+++ linux-2.6.19-rc2-mm1/kernel/timer.c	2006-10-17 22:13:09.640152430 -0500
@@ -1212,9 +1212,7 @@ static void update_wall_time(void)
 
 static void sched_tick_action(unsigned long dummy)
 {
-	local_irq_disable();
 	scheduler_tick();
-	local_irq_enable();
 }
 
 static DECLARE_TASKLET(scheduler_tick_tasklet, sched_tick_action, 0);