[ACPI] fix C1 patch for IA64

http://bugzilla.kernel.org/show_bug.cgi?id=4233

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

arch/ia64/kernel/process.c

@@ -195,6 +195,7 @@ update_pal_halt_status(int status)
 void
 default_idle (void)
 {
+	local_irq_enable();
 	while (!need_resched())
 		if (can_do_pal_halt)
 			safe_halt();