linux-kernel - Re: [PATCH] x86: fix missing cpu

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Date:	Thu, 30 Oct 2008 14:21:20 -0700
From:	"Yinghai Lu" <yinghai@...nel.org>
To:	"James Bottomley" <James.Bottomley@...senpartnership.com>
Cc:	"Ingo Molnar" <mingo@...e.hu>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: fix missing cpu_index initialisation

On Thu, Oct 30, 2008 at 2:13 PM, James Bottomley
<James.Bottomley@...senpartnership.com> wrote:
> >From f49bbb826d8ec87609a63fb014af6aacb16aac38 Mon Sep 17 00:00:00 2001
> From: James Bottomley <James.Bottomley@...senPartnership.com>
> Date: Wed, 29 Oct 2008 15:13:09 -0500
> Subject: [VOYAGER] x86: fix missing cpu_index initialisation
>
> Ever since
>
> commit 92cb7612aee39642d109b8d935ad265e602c0563
> Author: Mike Travis <travis@....com>
> Date:   Fri Oct 19 20:35:04 2007 +0200
>
>    x86: convert cpuinfo_x86 array to a per_cpu array
>
> We've had an extra field in cpuinfo_x86 which is cpu_index.
> Unfortunately, voyager has never initialised this, although the only
> noticeable impact seems to be that /proc/cpuinfo shows all zeros for
> the processor ids.
>
> Anyway, fix this by initialising the boot CPU properly and setting the
> index when the secondaries update.
>
> Signed-off-by: James Bottomley <James.Bottomley@...senPartnership.com>
> ---
>
> Depends on [VOYAGER] x86: add ability to test for boot CPU
>
>  arch/x86/kernel/cpu/common.c        |    2 ++
>  arch/x86/mach-voyager/voyager_smp.c |    1 +
>  2 files changed, 3 insertions(+), 0 deletions(-)
>
> diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
> index 93e9393..da8f15a 100644
> --- a/arch/x86/kernel/cpu/common.c
> +++ b/arch/x86/kernel/cpu/common.c
> @@ -549,6 +549,8 @@ static void __init early_identify_cpu(struct cpuinfo_x86 *c)
>                this_cpu->c_early_init(c);
>
>        validate_pat_support(c);
> +
> +       c->cpu_index = boot_cpu_id;
>  }
...
  CC      arch/x86/kernel/cpu/common.o
arch/x86/kernel/cpu/common.c: In function 'early_identify_cpu':
arch/x86/kernel/cpu/common.c:553: error: 'boot_cpu_id' undeclared
(first use in this function)
arch/x86/kernel/cpu/common.c:553: error: (Each undeclared identifier
is reported only once
arch/x86/kernel/cpu/common.c:553: error: for each function it appears in.)
make[2]: *** [arch/x86/kernel/cpu/common.o] Error 1
make[1]: *** [arch/x86/kernel/cpu] Error 2
make: *** [arch/x86/kernel] Error 2

YH
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