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

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Message-ID: <4988FA4A.6080002@goop.org>
Date:	Tue, 03 Feb 2009 18:15:38 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	"H. Peter Anvin" <hpa@...nel.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

H. Peter Anvin wrote:
> 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!

Can you push this Linusward too?

Thanks,
    J
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