linux-kernel - Re: [tip:irq/core] genirq: Make nr

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Date:	Mon, 21 Feb 2011 20:17:37 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Lars-Peter Clausen <lars@...afoo.de>
cc:	Yinghai Lu <yinghai@...nel.org>, linux-kernel@...r.kernel.org,
	mingo@...hat.com, hpa@...or.com, linux-tip-commits@...r.kernel.org
Subject: Re: [tip:irq/core] genirq: Make nr_irqs runtime expandable

On Mon, 21 Feb 2011, Lars-Peter Clausen wrote:
> On 02/19/2011 08:07 PM, Yinghai Lu wrote:
> > On 02/19/2011 04:15 AM, tip-bot for Thomas Gleixner wrote:
> > -	if (start >= nr_irqs) {
> > +	if (start + cnt > nr_irqs) {
> >  		ret = irq_expand_nr_irqs(cnt);
> Just a minor thing, but if there are still unused irqs available at the end of
> the current range, you'll end up expanding the range more then you need to.
> So either do
> 	irq_expand_nr_irqs(nr_irqs - start + cnt);
> or change irq_expand_nr_irqs to let it take the new total number of irqs.

Fun, I already changed YH's patch in that way :)
 
> Btw., with this patch in place does it make sense to initialize nr_irqs to
> anything else then initcnt in early_irq_init?

Probably not.

Thanks,

	tglx
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