linux-kernel - Re: [Patch2/2] fix wrong proc cpuinfo on x64

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Message-ID: <20071106183710.GD15369@alberich.amd.com>
Date:	Tue, 6 Nov 2007 19:37:10 +0100
From:	"Andreas Herrmann" <andreas.herrmann3@....com>
To:	"Zou Nan hai" <nanhai.zou@...el.com>
cc:	"LKML" <linux-kernel@...r.kernel.org>,
	"Andrew Morton" <akpm@...l.org>
Subject: Re: [Patch2/2] fix wrong proc cpuinfo on x64

On Tue, Nov 06, 2007 at 04:28:20PM +0800, Zou Nan hai wrote:
> in 2.6.24-rc1 kernel, 
> The /proc/cpuinfo display is wrong.
> 
> Another issue is that it will display bogus cpus with wrong information
> if the kernel is compiled with a big CONFIG_NR_CPU.
> 
> That is because before a cpu in cpu_present_map is up, c->cpu_index of
> that cpu is 0.
> thus the cpu_online(c->cpu_index) check in show_cpuinfo is invalid.

This issue should already be fixed with that patch

http://marc.info/?l=linux-kernel&m=119394201230954

> This patch will let cpuinfo_op use cpu_online_map instead of
> cpu_present_map to iterate cpus.

BTW, the problem affects i386 as well.


Regards,

Andreas

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