linux-kernel - Re: [PATCH v4 14/26] genirq: Add affinity to percpu

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Message-ID: <20251112181318.000064be@huawei.com>
Date: Wed, 12 Nov 2025 18:13:18 +0000
From: Jonathan Cameron <jonathan.cameron@...wei.com>
To: Marc Zyngier <maz@...nel.org>
CC: <linux-kernel@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-acpi@...r.kernel.org>, Thomas Gleixner <tglx@...utronix.de>, "Mark
 Rutland" <mark.rutland@....com>, Will Deacon <will@...nel.org>, "Rafael J.
 Wysocki" <rafael@...nel.org>, Rob Herring <robh@...nel.org>, "Saravana
 Kannan" <saravanak@...gle.com>, Greg Kroah-Hartman
	<gregkh@...uxfoundation.org>, Sven Peter <sven@...nel.org>, Janne Grunau
	<j@...nau.net>, Suzuki K Poulose <suzuki.poulose@....com>, James Clark
	<james.clark@...aro.org>, Jinjie Ruan <ruanjinjie@...wei.com>, "Alexandru
 Elisei" <alexandru.elisei@....com>
Subject: Re: [PATCH v4 14/26] genirq: Add affinity to percpu_devid interrupt
 requests

On Mon, 20 Oct 2025 13:29:31 +0100
Marc Zyngier <maz@...nel.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@...nel.org>
> Signed-off-by: Marc Zyngier <maz@...nel.org>

With trivial bit of documentation added
Reviewed-by: Jonathan Cameron <jonathan.cameron@...wei.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;