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Date: Sat, 26 Oct 2002 08:03:45 -0700
From: "Martin J. Bligh" <mbligh@aracnet.com>
Reply-To: "Martin J. Bligh" <mbligh@aracnet.com>
To: Alan Cox <alan@redhat.com>, Dave Jones <davej@codemonkey.org.uk>
cc: Alan Cox <alan@lxorguk.ukuu.org.uk>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] Double x86 initialise fix.
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>>> Isn't this always the case on x86 ?
>>> /me waits to hear gory details of some IBM monster.
>> 
>> It isnt. The boot CPU may be any number. In addition you can strap dual
>> pentium boxes to arbitrate for who is boot cpu (this is used for fault
>> tolerance).
> 
> Eh? I don't understand this, and I think Dave is right for all the
> IBM monsters I know of ;-) The *apicid* may not be 0 but the CPU
> numbers are dynamically assigned as we boot, so the boot CPU will
> always get 0, surely?

Indeed cscope indicates these are acutally hardcoded into the calls:

1 smpboot.c smp_callin    418 smp_store_cpu_info(cpuid);
2 smpboot.c smp_boot_cpus 989 smp_store_cpu_info(0);

The only thing that does smp_callin is a secondary ... so the boot
CPU has this hardcoded to 0 ... I think Dave's fine.

M.

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