linux-kernel - Re: [PATCH 08/42] introduce nr

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Message-ID: <m14p5uuqh3.fsf@frodo.ebiederm.org>
Date:	Sat, 09 Aug 2008 09:02:00 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	"Yinghai Lu" <yhlu.kernel@...il.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>, "Ingo Molnar" <mingo@...e.hu>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Dhaval Giani" <dhaval@...ux.vnet.ibm.com>,
	"Mike Travis" <travis@....com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 08/42] introduce nr_irqs

"Yinghai Lu" <yhlu.kernel@...il.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

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