linux-kernel - Re: [PATCH] x86: Plug racy xAPIC access of CPU hotplug code

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Message-ID: <52E8B7B0.8050803@siemens.com>
Date:	Wed, 29 Jan 2014 09:11:28 +0100
From:	Jan Kiszka <jan.kiszka@...mens.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Ingo Molnar <mingo@...nel.org>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: Plug racy xAPIC access of CPU hotplug code

On 2014-01-28 22:17, Andi Kleen wrote:
> Also with irq-off you of course still always have races against
> the NMI-level machine check.

The self-IPI triggered over NMI won't touch the high-part of the ICR and
will properly wait for ICR to become free again. So we are safe.

Jan

-- 
Siemens AG, Corporate Technology, CT RTC ITP SES-DE
Corporate Competence Center Embedded Linux
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