Commit bddda606 authored Dec 20, 2018 by Srinivas Ramana Committed by Thomas Gleixner Jan 15, 2019

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

parent 1c7fc5cb

kernel/irq/manage.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -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);

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