linux-kernel - Re: [PATCH] x86 (64): make calibrate_APIC

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Message-ID: <49B91066.3010000@fujitsu-siemens.com>
Date:	Thu, 12 Mar 2009 14:38:46 +0100
From:	Martin Wilck <martin.wilck@...itsu-siemens.com>
To:	Jean Delvare <jdelvare@...e.de>
CC:	Cyrill Gorcunov <gorcunov@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Wichert, Gerhard" <Gerhard.Wichert@...itsu-siemens.com>,
	"Maciej W. Rozycki" <macro@...ux-mips.org>
Subject: Re: [PATCH] x86 (64): make calibrate_APIC_clock() SMI-safe (take
 3)

Hi Jean,

same answer as on Bugzilla...

> Sorry for replying to such an old thread, but did this patch go
> anywhere? I can't seem to find it in git. Was it somehow obsoleted
> by a different fix for the same issue (SMI flood during APIC
> calibration)? Or is the upstream kernel still affected?

We were asked for a solution for all affected architectures (in 
particular, also i386) which was more than we were able to do
at the time, given that the pressure had been reduced by finding a BIOS 
fix for the particular situation on system in question.

The APIC clock calibration code on i386 is more complex than x86_64, we 
saw no way to provide a high-quality, regression-safe, tested patch for 
that to upstream with a reasonable amount of effort.

That aside, I still think the x86_64 patch is fine and won't cause 
regressions. It just doesn't help on 32bit systems.

Martin

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Martin Wilck
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FSC IP ESP DEV 6

Fujitsu Siemens Computers GmbH
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