Date: Wed, 4 Aug 2010 23:18:16 +0900
To: Joerg.Roedel@amd.com
Cc: fujita.tomonori@lab.ntt.co.jp, subrata@linux.vnet.ibm.com,
        linux-kernel@vger.kernel.org, Linuxppc-dev@ozlabs.org,
        grant.likely@secretlab.ca, James.Bottomley@suse.de,
        brking@linux.vnet.ibm.com, tj@kernel.org, rcj@linux.vnet.ibm.com,
        devilbis@us.ibm.com, santil@us.ibm.com, sleddog@us.ibm.com,
        sachinp@linux.vnet.ibm.com, dipraksh@linux.vnet.ibm.com
Subject: Re: 2.6.35-stable/ppc64/p7: Badness at lib/dma-debug.c:902, Call
 Trace	& Instruction Dump during boot
From: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
In-Reply-To: <20100804131634.GX26098@amd.com>
References: <1280746270.15317.16.camel@subratamodak.linux.ibm.com>
	<20100802205404C.fujita.tomonori@lab.ntt.co.jp>
	<20100804131634.GX26098@amd.com>
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On Wed, 4 Aug 2010 15:16:34 +0200
"Roedel, Joerg" <Joerg.Roedel@amd.com> wrote:

> On Mon, Aug 02, 2010 at 07:55:03AM -0400, FUJITA Tomonori wrote:
> > I guess that this driver does a partial sync with
> > dma_sync_single_for_* API. dma-debug can't handle it properly. It's
> > likely that this is a false warning.
> 
> If this turns out to be true it is not trivial to fix. I prepare a patch
> to test for you.

I've not looked at the details of this driver, but there are drivers
that do such. So dma-debug needs to be fixed anyway; you can't assume
that a DMA address that dma_map_single returned is passed to
dma_sync_single_for API.
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