Merge branch 'rt/head' into rt/2.6.31-rc6

kernel/irq/manage.c

@@ -851,6 +851,13 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
 
 	atomic_spin_unlock_irqrestore(&desc->lock, flags);
 
+	/*
+	 * Strictly no need to wake it up, but hung_task complains
+	 * when no hard interrupt wakes the thread up.
+	 */
+	if (new->thread)
+		wake_up_process(new->thread);
+
 	register_irq_proc(irq, desc);
 	new->dir = NULL;
 	register_handler_proc(irq, new);