linux-kernel - Re: Linux 2.6.23-rc4, maxcpus=1 regression

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Message-ID: <20070829040345.GA5260@elte.hu>
Date:	Wed, 29 Aug 2007 06:03:45 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Len Brown <lenb@...nel.org>
Subject: Re: Linux 2.6.23-rc4, maxcpus=1 regression


* Ingo Molnar <mingo@...e.hu> wrote:

> maxcpus=1 fails to boot on my T60 laptop, it hangs in early bootup 
> (right after setting up the local APICs). I bisected it down to this 
> recent commit:
> 
> | commit 61ec7567db103d537329b0db9a887db570431ff4
> | Author: Len Brown <len.brown@...el.com>
> | Date:   Thu Aug 16 03:34:22 2007 -0400
> |
> |     ACPI: boot correctly with "nosmp" or "maxcpus=0"
> 
> reverting that commit makes the system boot again. I've attached the 
> .config.

i suspect it's due to this:

 -early_param("maxcpus=", maxcpus);
 +__setup("maxcpus=", maxcpus);

i'm quite sure maxcpus still needs to be an early-param.

	Ingo
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