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: <20100804131634.GX26098@amd.com>
Date:	Wed, 4 Aug 2010 15:16:34 +0200
From:	"Roedel, Joerg" <Joerg.Roedel@....com>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
CC:	"subrata@...ux.vnet.ibm.com" <subrata@...ux.vnet.ibm.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Linuxppc-dev@...abs.org" <Linuxppc-dev@...abs.org>,
	"grant.likely@...retlab.ca" <grant.likely@...retlab.ca>,
	"James.Bottomley@...e.de" <James.Bottomley@...e.de>,
	"brking@...ux.vnet.ibm.com" <brking@...ux.vnet.ibm.com>,
	"tj@...nel.org" <tj@...nel.org>,
	"rcj@...ux.vnet.ibm.com" <rcj@...ux.vnet.ibm.com>,
	"devilbis@...ibm.com" <devilbis@...ibm.com>,
	"santil@...ibm.com" <santil@...ibm.com>,
	"sleddog@...ibm.com" <sleddog@...ibm.com>,
	"sachinp@...ux.vnet.ibm.com" <sachinp@...ux.vnet.ibm.com>,
	"dipraksh@...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 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.

	Joerg

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