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genirq: Honour IRQ's affinity hint during migration

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An IRQ affinity is broken during hotplug/isolation when there
are no online and un-isolated CPUs in the current affinity mask.
An online and un-isolated CPU from the irq_default_affinity mask
(i.e /proc/irq/default_smp_affinity) is used as the current
affinity. However Individual IRQs can have their affinity hint
set via irq_set_affinity_hint() API. When such hint is available,
use it instead of the irq_default_affinity which is a system level
setting.

Change-Id: I53a537582ec4e1aed0c59b49f4fd5b6ca7c0c332
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
Signed-off-by: Satya Durga Srinivasu Prabhala <satyap@codeaurora.org>
This commit is contained in:
Pavankumar Kondeti 2018-12-03 15:05:26 +05:30 • committed by Gerrit - the friendly Code Review server
commit 1c71817e0f
1 changed files with 6 additions and 2 deletions
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8
kernel/irq/cpuhotplug.c
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@ -116,6 +116,8 @@ static bool migrate_one_irq(struct irq_desc *desc)
affinity = &available_cpus;
if (cpumask_any_and(affinity, cpu_online_mask) >= nr_cpu_ids) {
const struct cpumask *default_affinity;
/*
* If the interrupt is managed, then shut it down and leave
* the affinity untouched.
@ -125,6 +127,8 @@ static bool migrate_one_irq(struct irq_desc *desc)
irq_shutdown_and_deactivate(desc);
return false;
}
default_affinity = desc->affinity_hint ? : irq_default_affinity;
/*
* The order of preference for selecting a fallback CPU is
*
@ -134,9 +138,9 @@ static bool migrate_one_irq(struct irq_desc *desc)
*/
cpumask_andnot(&available_cpus, cpu_online_mask,
cpu_isolated_mask);
if (cpumask_intersects(&available_cpus, irq_default_affinity))
if (cpumask_intersects(&available_cpus, default_affinity))
cpumask_and(&available_cpus, &available_cpus,
irq_default_affinity);
default_affinity);
else if (cpumask_empty(&available_cpus))
affinity = cpu_online_mask;