On Thu, 2010-04-01 at 09:59 +0800, gshan wrote: > On multi-core system, spin_lock_irqsave() can stop all CPU cores > receiving interrupts? No. > If the answer is no, what we can do to disable external interrupt for > all CPU cores? You don't :-) Really, you generally don't. Why would you want to do that ? Cheers, Ben.