From mboxrd@z Thu Jan  1 00:00:00 1970
From: Russ Anderson <rja@sgi.com>
Date: Wed, 27 Feb 2008 15:19:16 +0000
Subject: Re: Tiger oops in ia64_sal_physical_id_info (was [RFC] regression:113134fcbca83619be4c68d0ca66db6093
Message-Id: <20080227151915.GA9080@sgi.com>
List-Id: <linux-ia64.vger.kernel.org>
References: <200802251027.15107.bjorn.helgaas@hp.com>
In-Reply-To: <200802251027.15107.bjorn.helgaas@hp.com>
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To: linux-ia64@vger.kernel.org

On Wed, Feb 27, 2008 at 06:38:04AM -0800, Luck, Tony wrote:
> > > Did it work before?
> >
> > Yes.
> 
> How about a more drastic approach to avoiding the
> problem ... avoid any poking around looking for
> siblings on pre-montecito processors?

I like that idea.  No need to look for siblings
on CPUs that do not support siblings.  

> diff --git a/arch/ia64/kernel/setup.c b/arch/ia64/kernel/setup.c
> index ebd1a09..7b0e396 100644
> --- a/arch/ia64/kernel/setup.c
> +++ b/arch/ia64/kernel/setup.c
> @@ -736,7 +736,8 @@ identify_cpu (struct cpuinfo_ia64 *c)
>  	c->threads_per_core = c->cores_per_socket = c->num_log = 1;
>  	c->socket_id = -1;
>  
> -	identify_siblings(c);
> +	if (cpuid.field.family > 0x1f)
> +		identify_siblings(c);
>  
>  	if (c->threads_per_core > smp_num_siblings)
>  		smp_num_siblings = c->threads_per_core;

-- 
Russ Anderson, OS RAS/Partitioning Project Lead  
SGI - Silicon Graphics Inc          rja@sgi.com