linux-kernel - [regression 2.6.27.10 & 2.6.28] \"nolapic\" option causes \"nosmp\"?

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Message-Id: <200901050318.n053Iu0L068557@www262.sakura.ne.jp>
Date:	Mon, 05 Jan 2009 12:18:56 +0900
From:	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
To:	linux-kernel@...r.kernel.org
Cc:	hpa@...or.com
Subject: [regression 2.6.27.10 & 2.6.28] \"nolapic\" option causes \"nosmp\"?

Hello.

Adding "nolapic" option to kernel command line causes /proc/cpuinfo to show
only 1 CPU, while the machine has 2 CPUs and the kernel was compiled with
CONFIG_SMP=y.

Something is wrong with CPU recognition/initialization code?

This topic is continued from http://lkml.org/lkml/2008/12/30/104 .
I confirmed that this problem occurs on native Ubuntu 8.04 (i386) and
native CentOS 5.2 (x86_64) on ThinkPad X60 (Core 2 Duo).

Kernel 2.6.26.8 seems to be OK.

Regards.
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