linux-kernel - Re: [RFC -tip] x86,apic - set cpu_has

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Date:	Sun, 12 Jul 2009 09:52:00 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	"Maciej W. Rozycki" <macro@...ux-mips.org>
Cc:	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Yinghai Lu <yinghai@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC -tip] x86,apic - set cpu_has_apic for discrete apic

[Maciej W. Rozycki - Sun, Jul 12, 2009 at 01:41:54AM +0100]
| On Sun, 12 Jul 2009, Cyrill Gorcunov wrote:
| 
| > In case of discrete apic (due to hardware or firmware reason)
| > cpuid may not retrieve cpu_has_apic bit. So for SMP
| > compiled kernels instead of long check we may set "fake"
| > cpu_has_apic bit and check only the bit in further code
| > flow.
| > 
| > Signed-off-by: Cyrill Gorcunov <gorcunov@...nvz.org>
| > ---
| > 
| > Please review carefully.
| 
|  Sure: how did you test it or plan to do so?
| 
|   Maciej
| 

  Well, I've been using code reading. No real hardware test.
I just don't have such a hardware.

  I've a two pretty old laptops will check today if they
are discrete apic based systems.

  Also I was thinking about spurious software tests --
ie to set discrete apic manually but actually I don't
think it will help.

  And also I hoped that Ingo has a hw farm even with
discrete apic maybe... :)

	-- Cyrill
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