linux-kernel - Re: [PATCH v3 03/26] of/irq: Add IRQ affinity reporting interface

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Message-ID: <86plahx32v.wl-maz@kernel.org>
Date: Mon, 20 Oct 2025 11:47:04 +0100
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>
Subject: Re: [PATCH v3 03/26] of/irq: Add IRQ affinity reporting interface

On Thu, 09 Oct 2025 17:49:59 +0100,
Jonathan Cameron <jonathan.cameron@...wei.com> wrote:
> 
> On Mon, 22 Sep 2025 09:28:10 +0100
> Marc Zyngier <maz@...nel.org> wrote:
> 
> > Plug the irq_populate_fwspec_info() helper into the OF layer
> > to offer an IRQ affinity reporting function.
> > 
> > Signed-off-by: Marc Zyngier <maz@...nel.org>
> Trivial comment inline but I don't care that much.
> Reviewed-by: Jonathan Cameron <jonathan.cameron@...wei.com>
> 
> > ---
> >  drivers/of/irq.c       | 20 ++++++++++++++++++++
> >  include/linux/of_irq.h |  7 +++++++
> >  2 files changed, 27 insertions(+)
> > 
> > diff --git a/drivers/of/irq.c b/drivers/of/irq.c
> > index 74aaea61de13c..9a205cb033bda 100644
> > --- a/drivers/of/irq.c
> > +++ b/drivers/of/irq.c
> > @@ -479,6 +479,26 @@ int of_irq_get(struct device_node *dev, int index)
> >  }
> >  EXPORT_SYMBOL_GPL(of_irq_get);
> >  
> > +const struct cpumask *of_irq_get_affinity(struct device_node *dev, int index)
> > +{
> > +	struct of_phandle_args oirq;
> > +	struct irq_fwspec_info info;
> > +	struct irq_fwspec fwspec;
> > +	int rc;
> > +
> > +	rc = of_irq_parse_one(dev, index, &oirq);
> > +	if (rc)
> > +		return NULL;
> > +
> > +	of_phandle_args_to_fwspec(oirq.np, oirq.args, oirq.args_count,
> > +				  &fwspec);
> > +
> > +	if (!irq_populate_fwspec_info(&fwspec, &info))
> > +		return info.affinity;
> My slightly picky mental consistency filter suggests that this would look
> more like the ACPI version as
> 
> 	if (irq_populate_fwspec_info(&fwspec, &info))
> 		return NULL;
> 
> 	return info.affinity;
> 
> But I don't really care.

Consistency doesn't hurt. I've applied this.

Thanks,

	M.

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