linux-kernel - Re: [PATCH 0/3] dyn

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Date:	Thu, 31 Jul 2008 15:14:57 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Yinghai Lu <yhlu.kernel@...il.com>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	Mike Travis <travis@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, benh <benh@...nel.crashing.org>
Subject: Re: [PATCH 0/3] dyn_array support #2

Peter Zijlstra <peterz@...radead.org> writes:

> On Wed, 2008-07-30 at 21:09 -0700, Yinghai Lu wrote:
>> please check the patches adding dyn_array and nr_irqs #2
>
> Why can't we use a radix tree like powerpc does?

Unless I am mistaken the ppc uses the radix tree for something
different.  We don't have any architecture in the kernel to
my knowledge that doesn't use an array of irq_desc entries.

Killing the array of irq_desc entries and along with it
NR_IRQS is what needs to happen.

Eric
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