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Commit eed0dd71 authored by Praveen Chidambaram's avatar Praveen Chidambaram
Browse files

arm64: irq: Notify affinity change when migrating IRQs during hotplug 



Hotplug causes IRQs affine to a core that is being taken down to migrate
to an online core. This is done by directly calling the irq_set_affinity
associated with the irq_chip structure. Instead using the
irq_set_affinity() api lets the notifications bubble through.

Change-Id: Ifedd6726dedffd751aee7da2e88dbb802dfa535e
Signed-off-by: default avatarPraveen Chidambaram <pchidamb@codeaurora.org>
parent 0410136f

arch/arm64/kernel/irq.c

+2 −13
Original line number Diff line number Diff line
@@ -87,8 +87,6 @@ static bool migrate_one_irq(struct irq_desc *desc) 
{

	struct irq_data *d = irq_desc_get_irq_data(desc);

	const struct cpumask *affinity = d->affinity;

	struct irq_chip *c;

	bool ret = false;



	/*

	 * If this is a per-CPU interrupt, or the affinity does not
@@ -97,18 +95,9 @@ static bool migrate_one_irq(struct irq_desc *desc) 
	if (irqd_is_per_cpu(d) || !cpumask_test_cpu(smp_processor_id(), affinity))

		return false;



	if (cpumask_any_and(affinity, cpu_online_mask) >= nr_cpu_ids) {

	if (cpumask_any_and(affinity, cpu_online_mask) >= nr_cpu_ids)

		affinity = cpu_online_mask;

		ret = true;

	}



	c = irq_data_get_irq_chip(d);

	if (!c->irq_set_affinity)

		pr_debug("IRQ%u: unable to set affinity\n", d->irq);

	else if (c->irq_set_affinity(d, affinity, true) == IRQ_SET_MASK_OK && ret)

		cpumask_copy(d->affinity, affinity);



	return ret;

	return __irq_set_affinity_locked(d, affinity) == 0;

}



/*