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

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Date:	Tue, 17 Nov 2009 00:43:02 +0300
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Mike Travis <travis@....com>,
	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 Mon, Nov 16, 2009 at 01:27:55PM -0800, H. Peter Anvin wrote:
> On 11/16/2009 01:24 PM, Ingo Molnar wrote:
> > 
> > * Mike Travis <travis@....com> wrote:
> > 
> >> --- linux.orig/init/calibrate.c
> >> +++ linux/init/calibrate.c
> >> @@ -123,23 +123,26 @@
> >>  {
> >>  	unsigned long ticks, loopbit;
> >>  	int lps_precision = LPS_PREC;
> >> +	bool boot_cpu = (smp_processor_id() == 0);
> > 
> > this code is shared by other architectures too - are you sure 
> > smp_processor_id()==0 is a proper 'I am the boot CPU' assumption 
> > everywhere?
> > 
> 
> It really shouldn't be for x86 either, although right now we play nasty
> renumbering games to accommodate that assumption.  It seems like we
> really should have a boot_cpu_id() or some such.
> 
> 	-hpa
> 

It seems we have one

	arch/x86/kernel/setup.c:125:unsigned int boot_cpu_id __read_mostly;

	-- Cyrill
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