Messages in this thread Patch in this message | | | From | Srinivas Ramana <> | Subject | [PATCH] genirq: Make sure the affinity to be set is not empty | Date | Thu, 20 Dec 2018 19:05:57 +0530 |
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If the default_affinity is managed/initialized by a system and all the cpus present in irq_default_affinity are hotplugged out we may end up passing a cpumask of 0 to irq_do_set_affinity().
Fix this by falling back to cpu_online_mask in case the calculated affinity becomes zero.
Signed-off-by: Srinivas Ramana <sramana@codeaurora.org> --- kernel/irq/manage.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c index 9dbdccab3b6a..5c0ba5ca5930 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); -- Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc., is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.
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