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SubjectRe: [PATCH] genirq: Make sure the affinity to be set is not empty
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On 12/20/2018 7:05 PM, Srinivas Ramana wrote:
> 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);
>
>

Hi,

Can you provide your feedback on this?

Thanks,
-- Srinivas R

--
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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