linux-kernel - Re: blackfin - cmpxchg not atomic ?

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Message-ID: <20070721072930.GS1678@pengutronix.de>
Date:	Sat, 21 Jul 2007 09:29:30 +0200
From:	Robert Schwebel <r.schwebel@...gutronix.de>
To:	Mike Frysinger <vapier.adi@...il.com>
Cc:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>, tonyko@...eo.ca,
	robin.getz@...log.com, linux-kernel@...r.kernel.org
Subject: Re: blackfin - cmpxchg not atomic ?

On Fri, Jul 20, 2007 at 04:36:12PM -0400, Mike Frysinger wrote:
> > Also, does you assembly stub _really_ modify memory atomically ? If yes,
> > then there should be no need for disabling interrupts. Else, I see a
> > major problem with SMP.
> 
> that isnt the only problem with SMP on Blackfin

Could you ealborate?

Robert
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