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Date: Mon, 16 Nov 2009 14:55:44 -0800
From: "H. Peter Anvin" <hpa@zytor.com>
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To: Mike Travis <travis@sgi.com>
CC: Ingo Molnar <mingo@elte.hu>, Thomas Gleixner <tglx@linutronix.de>,
       Andrew Morton <akpm@linux-foundation.org>,
       Heiko Carstens <heiko.carstens@de.ibm.com>,
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       Frederic Weisbecker <fweisbec@gmail.com>, x86@kernel.org,
       linux-kernel@vger.kernel.org
Subject: Re: [PATCH 3/6] INIT: Limit the number of per cpu calibration bootup
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References: <20091116210718.412792000@alcatraz.americas.sgi.com> <20091116210728.267482000@alcatraz.americas.sgi.com> <20091116212427.GC2221@elte.hu> <4B01C803.1010303@sgi.com> <4B01C8B5.7060903@zytor.com> <4B01D77D.3010006@sgi.com>
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On 11/16/2009 02:51 PM, Mike Travis wrote:
> 
> There's also some confusion on whether the boot_cpu_id is the APIC id (ia64)
> or the cpu_index (x86) or some other number (others).   (cpu_index 0 by
> definition will always be the boot cpu.)
> 

This is part of what I said... the whole cpu_index thing is a rather
awkward extra layer of indirection.

But regardless... we have a panarchitectural notion of a cpu ID, and
that is what boot_cpu_id() [or whatever we call it] should refer to.  On
some architectures that will be constant.

	-hpa