linux-kernel - Re: 2.6.35-stable/ppc64/p7: Badness at lib/dma-debug.c:902, Call Trace & Instruction Dump during boot

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Message-Id: <20100804231727H.fujita.tomonori@lab.ntt.co.jp>
Date:	Wed, 4 Aug 2010 23:18:16 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	Joerg.Roedel@....com
Cc:	fujita.tomonori@....ntt.co.jp, subrata@...ux.vnet.ibm.com,
	linux-kernel@...r.kernel.org, Linuxppc-dev@...abs.org,
	grant.likely@...retlab.ca, James.Bottomley@...e.de,
	brking@...ux.vnet.ibm.com, tj@...nel.org, rcj@...ux.vnet.ibm.com,
	devilbis@...ibm.com, santil@...ibm.com, sleddog@...ibm.com,
	sachinp@...ux.vnet.ibm.com, dipraksh@...ux.vnet.ibm.com
Subject: Re: 2.6.35-stable/ppc64/p7: Badness at lib/dma-debug.c:902, Call
 Trace	& Instruction Dump during boot

On Wed, 4 Aug 2010 15:16:34 +0200
"Roedel, Joerg" <Joerg.Roedel@....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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