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Date: Tue, 28 Aug 2007 21:03:16 -0700 (PDT)
From: Linus Torvalds <torvalds@linux-foundation.org>
To: Ingo Molnar <mingo@elte.hu>
cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       Len Brown <lenb@kernel.org>, Hugh Dickins <hugh@veritas.com>
Subject: Re: Linux 2.6.23-rc4, maxcpus=1 regression
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 <20070829035554.GA838@elte.hu>
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On Wed, 29 Aug 2007, Ingo Molnar 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@intel.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.

Did you try -rc4? Commit 813409771731d80e6fa94199adf99f2269a4afc0 in 
particular ("fix maxcpus=N parsing") was supposed to fix that commit.

		Linus