Re: [PATCH v4 14/26] genirq: Add affinity to percpu_devid interrupt requests

Jonathan Cameron
2025-11-12T18:13:23Z

On Mon, 20 Oct 2025 13:29:31 +0100
Marc Zyngier <maz@kernel.org> wrote:

> Add an affinity field to both the irqaction structure and the interrupt
> request primitives. Nothing is making use of it yet, and the only value
> used it NULL, which is used as a shorthand for cpu_possible_mask.

used is NULL

>
> This will shortly get used with actual affinities.
>
> Tested-by: Will Deacon <will@kernel.org>
> Signed-off-by: Marc Zyngier <maz@kernel.org>

With trivial bit of documentation added
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>

> ---
> include/linux/interrupt.h | 5 +++--
> kernel/irq/manage.c | 14 ++++++++++----
> 2 files changed, 13 insertions(+), 6 deletions(-)
>
> diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
> index 0ec1a71ab4e84..52147d5f432b3 100644
> --- a/include/linux/interrupt.h
> +++ b/include/linux/interrupt.h
> @@ -125,6 +125,7 @@ struct irqaction {
> void *dev_id;
> void __percpu *percpu_dev_id;
> };
> + const struct cpumask *affinity;

This structure has kernel-doc that needs an update.

> struct irqaction *next;
> irq_handler_t thread_fn;
> struct task_struct *thread;