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

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Message-ID: <1303979259.26744.3.camel@e102109-lin.cambridge.arm.com>
Date:	Thu, 28 Apr 2011 09:27:39 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Valdis.Kletnieks@...edu
Cc:	Arnd Bergmann <arnd@...db.de>, 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 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.

-- 
Catalin


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