linux-kernel - Re: dma-debug: check_for

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Message-ID: <20090614212018.GD20442@fluff.org.uk>
Date:	Sun, 14 Jun 2009 22:20:18 +0100
From:	Ben Dooks <ben-linux@...ff.org>
To:	Stefan Richter <stefanr@...6.in-berlin.de>
Cc:	linux-kernel@...r.kernel.org, Joerg Roedel <joerg.roedel@....com>
Subject: Re: dma-debug: check_for_stack background?

On Sun, Jun 14, 2009 at 08:56:29PM +0200, Stefan Richter wrote:
> Hi,
>
> it took a while but I finally noticed that the DMA debug facility warns  
> about mappings of on-stack memory.  What's the problem with that?  Are  
> there architectures which don't support such mappings, or is it a  
> question of caution not to DMA-map the stack?

I'm not sure if it is possible on all architectures, however the
DMA mapping documentation prohibts the use of stack memory.

-- 
Ben (ben@...ff.org, http://www.fluff.org/)

  'a smiley only costs 4 bytes'
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