linux-kernel - Re: [RFC PATCH 1/5] use nr_cpus= to set nr_cpu

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Message-ID: <alpine.DEB.2.00.1001121331590.25925@router.home>
Date:	Tue, 12 Jan 2010 13:32:43 -0600 (CST)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Yinghai Lu <yinghai@...nel.org>
cc:	Suresh Siddha <suresh.b.siddha@...el.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"ananth@...ibm.com" <ananth@...ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 1/5] use nr_cpus= to set nr_cpu_ids early


On Tue, 12 Jan 2010, Yinghai Lu wrote:

> on x86, before prefill_possible_map(), nr_cpu_ids will be NR_CPUS aka CONFIG_NR_CPUS
>
> add nr_cpus= to set nr_cpu_ids. so we can simulate cpus <=8 on normal config.
> instead of change NR_CPUS directly.

We already have

maxcpus=x?

Why do we need this twice?

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