Commit-ID: bddda606ec76550dd63592e32a6e87e7d32583f7
Gitweb: https://git.kernel.org/tip/bddda606ec76550dd63592e32a6e87e7d32583f7
Author: Srinivas Ramana <sramana@xxxxxxxxxxxxxx>
AuthorDate: Thu, 20 Dec 2018 19:05:57 +0530
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Tue, 15 Jan 2019 11:23:27 +0100
genirq: Make sure the initial affinity is not empty
If all CPUs in the irq_default_affinity mask are offline when an interrupt
is initialized then irq_setup_affinity() can set an empty affinity mask for
a newly allocated interrupt.
Fix this by falling back to cpu_online_mask in case the resulting affinity
mask is zero.
Signed-off-by: Srinivas Ramana <sramana@xxxxxxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: linux-arm-msm@xxxxxxxxxxxxxxx
Link: https://lkml.kernel.org/r/1545312957-8504-1-git-send-email-sramana@xxxxxxxxxxxxxx
---
kernel/irq/manage.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index a4888ce4667a..84b54a17b95d 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -393,6 +393,9 @@ int irq_setup_affinity(struct irq_desc *desc)
}
cpumask_and(&mask, cpu_online_mask, set);
+ if (cpumask_empty(&mask))
+ cpumask_copy(&mask, cpu_online_mask);
+
if (node != NUMA_NO_NODE) {
const struct cpumask *nodemask = cpumask_of_node(node);
|