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Subject[PATCH 2/2] arm64: take onlined cpus into account when setting irq affinity in migrate_one_irq
Date
From: Byungchul Park <byungchul.park@lge.com>

This patch ensures that the cpu being offlined is not present in the affinity mask.

Signed-off-by: Byungchul Park <byungchul.park@lge.com>
---
arch/arm64/kernel/irq.c | 9 +++++++++
1 file changed, 9 insertions(+)

diff --git a/arch/arm64/kernel/irq.c b/arch/arm64/kernel/irq.c
index 473e5db..0c7b79e 100644
--- a/arch/arm64/kernel/irq.c
+++ b/arch/arm64/kernel/irq.c
@@ -87,6 +87,7 @@ 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 cpumask tmp_affinity;
struct irq_chip *c;
bool ret = false;

@@ -100,6 +101,14 @@ static bool migrate_one_irq(struct irq_desc *desc)
if (cpumask_any_and(affinity, cpu_online_mask) >= nr_cpu_ids) {
affinity = cpu_online_mask;
ret = true;
+ } else {
+ /*
+ * when using forced irq_set_affinity we must ensure that the cpu
+ * being offlined is not present in the affinity mask, it may be
+ * selected as the target CPU otherwise
+ */
+ cpumask_and(&tmp_affinity, affinity, cpu_online_mask);
+ affinity = &tmp_affinity;
}

c = irq_data_get_irq_chip(d);
--
1.7.9.5


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