On Wed, Sep 17, 2014 at 09:10:16AM -0700, Daniel Thompson wrote:
> @@ -604,8 +731,19 @@ static void gic_raise_softirq(const struct cpumask
> *mask, unsigned int irq)
> {
> int cpu;
> unsigned long flags, map = 0;
> + unsigned long softint;
>
> - raw_spin_lock_irqsave(&irq_controller_lock, flags);
> + /*
> + * The locking in this function ensures we don't use stale cpu mappings
> + * and thus we never route an IPI to the wrong physical core during a
> + * big.LITTLE switch. The switch code takes both of these locks meaning
> + * we can choose whichever lock is safe to use from our current calling
> + * context.
> + */
> + if (in_nmi())
> + raw_spin_lock(&fiq_safe_migration_lock);
> + else
> + raw_spin_lock_irqsave(&irq_controller_lock, flags);
BTW, I see this code is still here...
--
FTTC broadband for 0.8mile line: currently at 9.5Mbps down 400kbps up
according to speedtest.net.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
