linux-kernel - Re: [PATCH 2/2][RFC] time : set broadcast irq affinity

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Date:	Fri, 22 Feb 2013 19:45:32 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Jacob Pan <jacob.jun.pan@...ux.intel.com>
cc:	Daniel Lezcano <daniel.lezcano@...aro.org>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	santosh.shilimkar@...com, linux-pm@...r.kernel.org,
	fweisbec@...il.com, john.stultz@...aro.org,
	linaro-kernel@...ts.linaro.org
Subject: Re: [PATCH 2/2][RFC] time : set broadcast irq affinity

On Fri, 22 Feb 2013, Jacob Pan wrote:
> On Thu, 21 Feb 2013 23:01:23 +0100
> Daniel Lezcano <daniel.lezcano@...aro.org> wrote:
> 
> > +/*
> > + * Set broadcast interrupt affinity
> > + */
> > +static void tick_broadcast_set_affinity(struct clock_event_device
> > *bc, int cpu) +{
> > +	struct cpumask cpumask;
> > +
> > +	if (!(bc->features & CLOCK_EVT_FEAT_DYNIRQ))
> > +		return;
> > +
> > +	cpumask_clear(&cpumask);
> > +	cpumask_set_cpu(cpu, &cpumask);
> > +	irq_set_affinity(bc->irq, &cpumask);
> would it be more efficient to keep track of the current bc->irq affinity
> via cpumask then set it only if it is different?

You beat me :)
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