linux-kernel - Re: dma-debug: check_for

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Message-ID: <20090615081355.GA5139@amd.com>
Date:	Mon, 15 Jun 2009 10:13:55 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	Stefan Richter <stefanr@...6.in-berlin.de>
CC:	Ben Dooks <ben-linux@...ff.org>, linux-kernel@...r.kernel.org
Subject: Re: dma-debug: check_for_stack background?

On Sun, Jun 14, 2009 at 11:43:42PM +0200, Stefan Richter wrote:
> Ben Dooks wrote:
>> On Sun, Jun 14, 2009 at 08:56:29PM +0200, Stefan Richter wrote:
>>> the DMA debug facility warns  about mappings of on-stack memory.  
>>> What's the problem with that?
> ...
>> I'm not sure if it is possible on all architectures, however the
>> DMA mapping documentation prohibts the use of stack memory.
>
> Ah, it has all been documented in plain sight for ages.  Thanks for the  
> pointer.

Problem is that the stack might go away or could be otherwise reused
while the DMA is in-flight. This could cause really hard to debug
problems.

	Joerg

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