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Commit bddda606 authored by Srinivas Ramana's avatar Srinivas Ramana Committed by Thomas Gleixner
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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: default avatarSrinivas Ramana <sramana@codeaurora.org>
Signed-off-by: default avatarThomas 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);