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

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Message-ID: <48886E6D.1030005@fujitsu-siemens.com>
Date:	Thu, 24 Jul 2008 13:58:37 +0200
From:	Martin Wilck <martin.wilck@...itsu-siemens.com>
To:	Cyrill Gorcunov <gorcunov@...il.com>
CC:	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() smp-safe

Cyrill Gorcunov wrote:

> Hi, but what if SMI flood happens? We could stuck here forever, don't we?
> 
>                 - Cyrill -


Yes, if the SMI flood never ends. But you wouldn't want to work on such 
a system anyway (with the current kernel code, your APIC timer would 
most probably be miscalibrated, which can have the weirdest effects).

Anyway, we can add a maximum iteration count to the patch so that there 
is no risk of getting stuck.

Martin

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