linux-kernel - Re: nr_cpu_ids incorrect on AMD Quad-Core Opteron 8380

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Message-ID: <9ea470501002010704m15dfaedau813b7accfd1d22ff@mail.gmail.com>
Date:	Mon, 1 Feb 2010 16:04:42 +0100
From:	Borislav Petkov <petkovbb@...glemail.com>
To:	zhiyi <zhuang@...otago.ac.nz>
Cc:	linux-kernel@...r.kernel.org, Zhiyi Huang <hzy@...otago.ac.nz>,
	jkmair@...otago.ac.nz
Subject: Re: nr_cpu_ids incorrect on AMD Quad-Core Opteron 8380

On Mon, Feb 1, 2010 at 2:57 PM, Borislav Petkov <petkovbb@...glemail.com> wrote:
> On Sun, Jan 31, 2010 at 11:59 PM, zhiyi <zhuang@...otago.ac.nz> wrote:
>> My module worked for a kernel 2.6.29 with CONFIG_NR_CPUS=64 on my dual
>> quad-core AMD Opteron. The value of nr_cpu_ids I got from the same module
>> was correct (8).
>
> This could mean that your include/generated/autoconf.h, which is used by
> external modules, is not updated and contains CONFIG_NR_CPUS=8. Do
>
> make mrproper
>
> in your kernel directory by moving your .config out of the way first and
> then rebuild your kernel and external module(s). nr_cpu_ids should pick
> up the updated CONFIG_NR_CPUS value from your .config.

That's actually not necessary - the nr_cpu_ids thing is set at compile
time to CONFIG_NR_CPUS but then capped to a possibly lower value upon
boot depending on the info in the ACPI mptables. Can you please send the
.config and the full dmesg of the quadsocket machine?

Thanks.

-- 
Regards/Gruss,
Boris
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