linux-kernel - Re: [x86] do_arch

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Message-ID: <87bpvme76p.fsf@basil.nowhere.org>
Date:	Mon, 08 Dec 2008 21:35:42 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Eric Lacombe <goretux@...il.com>,
	Arjan van de Ven <arjan@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	linux-kernel@...r.kernel.org
Subject: Re: [x86] do_arch_prctl

Jeremy Fitzhardinge <jeremy@...p.org> writes:
>>
>> The task_struct is also updated in sys_arch_prctl (ARCH_SET_FS and
>> ARCH_SET_GS), so not just on a context switch.
>> How the task structure could be out of date wrt thread.gs and thread.fs?
>> What could be a typical scenario that could induced gs or fs to be
>> modified and not thread.gs and thread.fs?
>>
>
> Not sure.  It could just be redundant.

The process has just changed fs/gs, but not done a context switch yet.

-Andi

-- 
ak@...ux.intel.com
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