On Mon, 2011-07-18 at 17:39 -0700, Paul E. McKenney wrote: > > Hrm, no I don't see that happening no. The preempt count when > exiting an > > irq or softirq stack should be the exact same as when entering it, > which > > is why we don't bother copying it over. Do you see any case where > that > > wouldn't hold ? > > Nope, other than seeing preempt_count() transition from zero to three > across a spin_unlock_irqrestore() for no good reason that I could see. Do you have a nice repro-case ? :-) That sounds really nasty ... smells really like something bad's happening from an interrupt, but we don't copy back the preempt-count from the interrupt stacks at all, so that's really really odd. Cheers, Ben. -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
