linux-kernel - Re: [PATCH] x86_64: use apic core id bits for core nums

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Message-Id: <200707211428.46711.ak@suse.de>
Date:	Sat, 21 Jul 2007 14:28:46 +0200
From:	Andi Kleen <ak@...e.de>
To:	"Yinghai Lu" <yhlu.kernel@...il.com>
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>,
	joachim.deguara@....com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86_64: use apic core id bits for core nums

On Saturday 21 July 2007 13:21:34 Yinghai Lu wrote:
> On 7/21/07, Andi Kleen <ak@...e.de> wrote:
> > On Saturday 21 July 2007 09:56:15 Yinghai Lu wrote:
> > > please check my version, we should use core id bits instead.
> > >
> > > it should replace
> > > [PATCH for review] [37/48] x86_64: make k8topology multi-core aware
> >
> > Yes, you're right the patch is not good. It should probably use
> > information from the regular CPU setup code, not touch cpuid
> > directly
> 
> need move some code into early_identify_cpu from identify_cpu in
> arch/x86_64/kernel/setup.c
> then could use that bits in bsp cpu info.

Yes something like this
 
> BTW:
> it seems for BSP only early_identify_cpu is called, and identify_cpu
> is only use in smp_callin for AP. Do i miss sth.

identify_cpu calls early_identify_cpu as first thing.

-Andi

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