Commit-ID: 74def747bcd09692bdbf8c6a15350795b0f11ca8
Gitweb: http://git.kernel.org/tip/74def747bcd09692bdbf8c6a15350795b0f11ca8
Author: Marc Zyngier <marc.zyngier@xxxxxxx>
AuthorDate: Fri, 18 Aug 2017 09:39:14 +0100
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Fri, 18 Aug 2017 10:54:39 +0200
genirq: Restrict effective affinity to interrupts actually using it
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@xxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Andrew Lunn <andrew@xxxxxxx>
Cc: James Hogan <james.hogan@xxxxxxxxxx>
Cc: Jason Cooper <jason@xxxxxxxxxxxxxx>
Cc: Paul Burton <paul.burton@xxxxxxxxxx>
Cc: Chris Zankel <chris@xxxxxxxxxx>
Cc: Kevin Cernekee <cernekee@xxxxxxxxx>
Cc: Wei Xu <xuwei5@xxxxxxxxxxxxx>
Cc: Max Filippov <jcmvbkbc@xxxxxxxxx>
Cc: Florian Fainelli <f.fainelli@xxxxxxxxx>
Cc: Gregory Clement <gregory.clement@xxxxxxxxxxxxxxxxxx>
Cc: Matt Redfearn <matt.redfearn@xxxxxxxxxx>
Cc: Sebastian Hesselbarth <sebastian.hesselbarth@xxxxxxxxx>
Link: http://lkml.kernel.org/r/20170818083925.10108-2-marc.zyngier@xxxxxxx
---
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 d2d54379..dcfac6c 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)
--
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