Just because CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK is selected doesn't mean that all the interrupts are using the effective affinity mask. For a number of them, this mask is likely to be empty.
In order to deal with this, let's restrict the use of the effective affinity mask to these interrupts that have a non empty effective affinity. Signed-off-by: Marc Zyngier <marc.zyng...@arm.com> --- include/linux/irq.h | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/include/linux/irq.h b/include/linux/irq.h index d2d543794093..dcfac6c8ba18 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -781,7 +781,10 @@ static inline struct cpumask *irq_data_get_affinity_mask(struct irq_data *d) static inline struct cpumask *irq_data_get_effective_affinity_mask(struct irq_data *d) { - return d->common->effective_affinity; + if (!cpumask_empty(d->common->effective_affinity)) + return d->common->effective_affinity; + + return d->common->affinity; } static inline void irq_data_update_effective_affinity(struct irq_data *d, const struct cpumask *m) -- 2.11.0