linux-kernel - Re: [PATCH 3/6] INIT: Limit the number of per cpu calibration bootup messages

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Message-ID: <4B01D870.3090103@zytor.com>
Date:	Mon, 16 Nov 2009 14:55:44 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Mike Travis <travis@....com>
CC:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Roland Dreier <rdreier@...co.com>,
	Randy Dunlap <rdunlap@...otime.net>, Tejun Heo <tj@...nel.org>,
	Andi Kleen <andi@...stfloor.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Yinghai Lu <yhlu.kernel@...il.com>,
	David Rientjes <rientjes@...gle.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>,
	Jack Steiner <steiner@....com>,
	Frederic Weisbecker <fweisbec@...il.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/6] INIT: Limit the number of per cpu calibration bootup
 messages

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
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