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From: "H. Peter Anvin" <hpa@kernel.org>
To: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: Ingo Molnar <mingo@elte.hu>,
	the arch/x86 maintainers <x86@kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Xen-devel <xen-devel@lists.xensource.com>,
	Stable Kernel <stable@kernel.org>
Subject: Re: [PATCH] xen: disable interrupts before saving in percpu
Date: Tue, 03 Feb 2009 17:23:16 -0800	[thread overview]
Message-ID: <4988EE04.7090006@kernel.org> (raw)
In-Reply-To: <4988DAEA.6040608@goop.org>

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

  reply	other threads:[~2009-02-04  1:26 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-02-04  0:01 [PATCH] xen: disable interrupts before saving in percpu Jeremy Fitzhardinge
2009-02-04  0:01 ` Jeremy Fitzhardinge
2009-02-04  1:23 ` H. Peter Anvin [this message]
2009-02-04  2:15   ` Jeremy Fitzhardinge
2009-02-04  2:15     ` Jeremy Fitzhardinge
2009-02-04  2:21     ` H. Peter Anvin

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