linux-kernel - Re: [RFC] ARM DMA mapping TODO, v1

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Message-Id: <201104281412.40991.arnd@arndb.de>
Date:	Thu, 28 Apr 2011 14:12:40 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Catalin Marinas <catalin.marinas@....com>
Cc:	Valdis.Kletnieks@...edu, linaro-mm-sig@...ts.linaro.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC] ARM DMA mapping TODO, v1

On Thursday 28 April 2011, Catalin Marinas wrote:
> On Thu, 2011-04-28 at 01:15 +0100, Valdis.Kletnieks@...edu wrote:
> > On Wed, 27 Apr 2011 12:08:28 BST, Catalin Marinas said:
> > 
> > > The current version of the ARM ARM says "unpredictable". But this
> > > general definition of "unpredictable" does not allow it to deadlock
> > > (hardware) or have security implications. It is however allowed to
> > > corrupt data.
> > 
> > Not allowed to have security implications, but is allowed to corrupt data.
> 
> By security I was referring to TrustZone extensions. IOW, unpredictable
> in normal (non-secure) world should not cause data corruption in the
> secure world.

That definition is rather useless for operating systems that don't use
Trustzone then, right?

	Arnd
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