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From: ebiederm@xmission.com (Eric W. Biederman)
To: "Yinghai Lu" <yhlu.kernel@gmail.com>
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Date: Sat, 09 Aug 2008 09:02:00 -0700
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	(Yinghai Lu's message of "Sat, 9 Aug 2008 00:30:06 -0700")
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Subject: Re: [PATCH 08/42] introduce nr_irqs
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"Yinghai Lu" <yhlu.kernel@gmail.com> writes:

>> Also, what's the point, if it's just a renaming?
>
> that is the start point.
> nr_irqs is variable, and will be probed later. and use that number to
> init dyn_alloc.

YH. 

In my conception the code in kernel/irq.c that today does:

struct irq_desc *desc;
if (irq >= NR_IRQS)
   return -EINVAL;
desc = irq_desc + irq;

Should become:

struct irq_desc *desc;
desc = irq_desc(irq);
if (!desc)
   return -EINVAL;

Eric