Commit 32dda05f authored Sep 26, 2013 by Scott Wood Committed by Benjamin Herrenschmidt Oct 11, 2013

powerpc/mpic: Disable preemption when calling mpic_processor_id()



Otherwise, we get a debug traceback due to the use of
smp_processor_id() (or get_paca()) inside hard_smp_processor_id().
mpic_host_map() is just looking for a default CPU, so it doesn't matter
if we migrate after getting the CPU ID.

Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

parent f036b368

arch/powerpc/sysdev/mpic.c

+7 −1

Original line number	Diff line number	Diff line
		@@ -1088,8 +1088,14 @@ static int mpic_host_map(struct irq_domain *h, unsigned int virq,
		* is done here.
		*/
		if (!mpic_is_ipi(mpic, hw) && (mpic->flags & MPIC_NO_RESET)) {
		int cpu;

		preempt_disable();
		cpu = mpic_processor_id(mpic);
		preempt_enable();

		mpic_set_vector(virq, hw);
		mpic_set_destination(virq, mpic_processor_id(mpic));
		mpic_set_destination(virq, cpu);
		mpic_irq_set_priority(virq, 8);
		}