linux-kernel - Re: [PATCH] xen: disable interrupts before saving in percpu

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Message-ID: <4988EE04.7090006@kernel.org>
Date:	Tue, 03 Feb 2009 17:23:16 -0800
From:	"H. Peter Anvin" <hpa@...nel.org>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
CC:	Ingo Molnar <mingo@...e.hu>,
	the arch/x86 maintainers <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Xen-devel <xen-devel@...ts.xensource.com>,
	Stable Kernel <stable@...nel.org>
Subject: Re: [PATCH] xen: disable interrupts before saving in percpu

Jeremy Fitzhardinge wrote:
> xen_mc_batch has a small preempt race where it takes the address of a
> percpu variable immediately before disabling interrupts, thereby
> leaving a small window in which we may migrate to another cpu and save
> the flags in the wrong percpu variable.  Disable interrupts before
> saving the old flags in a percpu.

Applied to tip:core/xen, thanks!

	-hpa
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