genirq: Make sure the initial affinity is not empty
[ Upstream commit bddda606ec76550dd63592e32a6e87e7d32583f7 ] 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 Signed-off-by: Sasha Levin <sashal@kernel.org>
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@ -393,6 +393,9 @@ int irq_setup_affinity(struct irq_desc *desc)
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}
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cpumask_and(&mask, cpu_online_mask, set);
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if (cpumask_empty(&mask))
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cpumask_copy(&mask, cpu_online_mask);
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if (node != NUMA_NO_NODE) {
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const struct cpumask *nodemask = cpumask_of_node(node);
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