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authorSrinivas Ramana <sramana@codeaurora.org>2018-12-20 14:35:57 +0100
committerThomas Gleixner <tglx@linutronix.de>2019-01-15 11:23:27 +0100
commitbddda606ec76550dd63592e32a6e87e7d32583f7 (patch)
treeede90e17594152a9580d797d2c9b265ed1774c76
parentLinux 5.0-rc2 (diff)
downloadlinux-bddda606ec76550dd63592e32a6e87e7d32583f7.tar.xz
linux-bddda606ec76550dd63592e32a6e87e7d32583f7.zip
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@codeaurora.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: linux-arm-msm@vger.kernel.org Link: https://lkml.kernel.org/r/1545312957-8504-1-git-send-email-sramana@codeaurora.org
-rw-r--r--kernel/irq/manage.c3
1 files changed, 3 insertions, 0 deletions
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);