The boot_override_clocksource currently blindly turns on interrupts with
the releasing of the lock.  But if you have clocksource=xxx in the
command line, this function is called before interrupts are setup,
and causes early exception errors.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

Index: linux-2.6.16-rt23/kernel/time/clocksource.c
===================================================================
--- linux-2.6.16-rt23.orig/kernel/time/clocksource.c	2006-05-25 16:01:00.000000000 -0400
+++ linux-2.6.16-rt23/kernel/time/clocksource.c	2006-05-25 16:01:28.000000000 -0400
@@ -323,10 +323,11 @@ device_initcall(init_clocksource_sysfs);
  */
 static int __init boot_override_clocksource(char* str)
 {
-	spin_lock_irq(&clocksource_lock);
+	unsigned long flags;
+	spin_lock_irqsave(&clocksource_lock, flags);
 	if (str)
 		strlcpy(override_name, str, sizeof(override_name));
-	spin_unlock_irq(&clocksource_lock);
+	spin_unlock_irqrestore(&clocksource_lock, flags);
 	return 1;
 }
 

--