linux-kernel - Re: [PATCH] dma-debug: New interfaces to debug dma mapping errors

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Message-ID: <20120918133414.GM2505@amd.com>
Date:	Tue, 18 Sep 2012 15:34:14 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	Shuah Khan <shuah.khan@...com>
CC:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Greg KH <greg@...ah.com>, <tglx@...utronix.de>,
	<mingo@...hat.com>, <hpa@...or.com>, <rob@...dley.net>,
	<akpm@...ux-foundation.org>, <bhelgaas@...gle.com>,
	<stern@...land.harvard.edu>, LKML <linux-kernel@...r.kernel.org>,
	<linux-doc@...r.kernel.org>, <devel@...uxdriverproject.org>,
	<x86@...nel.org>, <shuahkhan@...il.com>
Subject: Re: [PATCH] dma-debug: New interfaces to debug dma mapping errors

On Mon, Sep 17, 2012 at 04:45:15PM -0600, Shuah Khan wrote:
> Yeah. I will firm up my ideas a bit and summarize in a day or two. Would
> like to hear your ideas as well at that time, so we can pick the one
> that works the best.

I think the best approach for this functionality is to add a flag to
'struct dma_debug_entry' which tells whether the address has been
checked with dma_mapping error or not. On unmap or driver unload you can
then check for that flag and print a warning when an unchecked address
is detected.


	Joerg

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