linux-kernel - Re: futex question

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Message-ID: <4AC9FCA6.8060203@anirban.org>
Date:	Mon, 05 Oct 2009 07:03:18 -0700
From:	Anirban Sinha <ani@...rban.org>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Darren Hart <dvhltc@...ibm.com>,
	Kaz Kylheku <kaz@...gmasystems.com>,
	Anirban Sinha <asinha@...gmasystems.com>
Subject: Re: futex question



Once upon a time, like on 09-10-05 6:28 AM, Thomas Gleixner wrote:
> Can you please fix your mail client to do proper line breaks at around
> 78 chars ?

Hmm. I made that change deliberately according to instructions in
Documentation/email-clients.txt so that it does not break my patches :) Anyway,
back to previous setting.

>>
>> We need to clear those pointers regardless. After the exceve(), the
>> address values are meaningless under the new mm context.
> 
> That's out of question. We just need to come to a decision whether we
> silently clean up callers dumbness or not.

Correct me if I am wrong, but according to Ingo:

> So i think exec() should release all existing state, unless told
> otherwise. Making it behave differently for robust futexes sounds
> assymetric to me.

I thought clearing the head pointers was a part of the stale existing state?
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