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

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Message-ID: <86ms4qt5n9.wl-maz@kernel.org>
Date: Thu, 13 Nov 2025 13:37:46 +0000
From: Marc Zyngier <maz@...nel.org>
To: Jonathan Cameron <jonathan.cameron@...wei.com>
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 Wed, 12 Nov 2025 18:13:18 +0000,
Jonathan Cameron <jonathan.cameron@...wei.com> wrote:
> 
> 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;

See 68c4c159a0db4 ("genirq: Fix percpu_devid irq affinity
documentation") in -next for the merged fix.

Thanks,

	M.

-- 
Without deviation from the norm, progress is not possible.