linux-kernel - Re: Linux 2.6.32-rc1

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Message-ID: <4AC397FE.8060001@s5r6.in-berlin.de>
Date:	Wed, 30 Sep 2009 19:40:14 +0200
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Arjan van de Ven <arjan@...radead.org>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	John Stultz <johnstul@...ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: Linux 2.6.32-rc1

Linus Torvalds wrote:
> On Wed, 30 Sep 2009, Stefan Richter wrote:
>> As long as it can't be turned into an atomic access, shouldn't cmpxchg64
>> be hidden from the common kernel coder?  Almost everybody will assume
>> that it is an atomic operation and happily use it in unsafe places.
> 
> But it _is_ atomic. We don't support SMP on the platforms that we have to 
> do it with emulation on.
> 
> There's a theoretical problem with NMI, but it's not one we can solve or 
> that is really all that interesting, so might as well ignore it.

Ah, right, I could have taken a hint from /* disable interrupts */ in
Arjan's cmpxchg8b_emu.
-- 
Stefan Richter
-=====-==--= =--= ====-
http://arcgraph.de/sr/
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