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[PATCH v2 01/12] genirq: Restrict effective affinity to interrupts actually using it

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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.zyngier@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

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[PATCH v2 00/12] genirq/irqchip: Effective affinity fixups Marc Zyngier <marc.zyngier@arm.com> - 2017-08-18 10:40 +0200
  [PATCH v2 05/12] irqchip/gic-v3-its: Report that effective affinity is a single target Marc Zyngier <marc.zyngier@arm.com> - 2017-08-18 10:40 +0200
    [tip:irq/core] irqchip/gic-v3-its: Report that effective affinity  is a single target tip-bot for Marc Zyngier <tipbot@zytor.com> - 2017-08-18 11:10 +0200
  [PATCH v2 04/12] irqchip/gic-v3: Report that effective affinity is a single target Marc Zyngier <marc.zyngier@arm.com> - 2017-08-18 10:40 +0200
    [tip:irq/core] irqchip/gic-v3: Report that effective affinity is a  single target tip-bot for Marc Zyngier <tipbot@zytor.com> - 2017-08-18 11:10 +0200
  [PATCH v2 02/12] genirq/proc: Use the the accessor to report the effective affinity Marc Zyngier <marc.zyngier@arm.com> - 2017-08-18 10:40 +0200
    [tip:irq/core] genirq/proc: Use the the accessor to report the  effective affinity tip-bot for Marc Zyngier <tipbot@zytor.com> - 2017-08-18 11:10 +0200
  [PATCH v2 11/12] irqchip/mips-gic: Report that effective affinity is a single target Marc Zyngier <marc.zyngier@arm.com> - 2017-08-18 10:50 +0200
    [tip:irq/core] irqchip/mips-gic: Report that effective affinity is  a single target tip-bot for Marc Zyngier <tipbot@zytor.com> - 2017-08-18 11:10 +0200
  [PATCH v2 09/12] irqchip/metag-ext: Report that effective affinity is a single target Marc Zyngier <marc.zyngier@arm.com> - 2017-08-18 10:50 +0200
    [tip:irq/core] irqchip/metag-ext: Report that effective affinity is  a single target tip-bot for Marc Zyngier <tipbot@zytor.com> - 2017-08-18 11:10 +0200
  [PATCH v2 07/12] irqchip/bcm-6345-l1: Report that effective affinity is a single target Marc Zyngier <marc.zyngier@arm.com> - 2017-08-18 10:50 +0200
    [tip:irq/core] irqchip/bcm-6345-l1: Report that effective affinity  is a single target tip-bot for Marc Zyngier <tipbot@zytor.com> - 2017-08-18 11:10 +0200
  [PATCH v2 01/12] genirq: Restrict effective affinity to interrupts actually using it Marc Zyngier <marc.zyngier@arm.com> - 2017-08-18 10:50 +0200
    [tip:irq/core] genirq: Restrict effective affinity to interrupts  actually using it tip-bot for Marc Zyngier <tipbot@zytor.com> - 2017-08-18 11:10 +0200
  [PATCH v2 03/12] irqchip/gic: Report that effective affinity is a single target Marc Zyngier <marc.zyngier@arm.com> - 2017-08-18 10:50 +0200
    [tip:irq/core] irqchip/gic: Report that effective affinity is a  single target tip-bot for Marc Zyngier <tipbot@zytor.com> - 2017-08-18 11:10 +0200
  [PATCH v2 10/12] irqchip/hip04: Report that effective affinity is a single target Marc Zyngier <marc.zyngier@arm.com> - 2017-08-18 10:50 +0200
    [tip:irq/core] irqchip/hip04: Report that effective affinity is a  single target tip-bot for Marc Zyngier <tipbot@zytor.com> - 2017-08-18 11:10 +0200
  [PATCH v2 12/12] irqchip/xtensa-mx: Report that effective affinity is a single target Marc Zyngier <marc.zyngier@arm.com> - 2017-08-18 10:50 +0200
    [tip:irq/core] irqchip/xtensa-mx: Report that effective affinity is  a single target tip-bot for Marc Zyngier <tipbot@zytor.com> - 2017-08-18 11:10 +0200
  [PATCH v2 08/12] irqchip/bcm-7038-l1: Report that effective affinity is a single target Marc Zyngier <marc.zyngier@arm.com> - 2017-08-18 10:50 +0200
    [tip:irq/core] irqchip/bcm-7038-l1: Report that effective affinity  is a single target tip-bot for Marc Zyngier <tipbot@zytor.com> - 2017-08-18 11:10 +0200
  [PATCH v2 06/12] irqchip/armada-370-xp: Report that effective affinity is a single target Marc Zyngier <marc.zyngier@arm.com> - 2017-08-18 10:50 +0200
    [tip:irq/core] irqchip/armada-370-xp: Report that effective  affinity is a single target tip-bot for Marc Zyngier <tipbot@zytor.com> - 2017-08-18 11:10 +0200

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