linux-kernel - Re: [PATCH] alpha: Add DMA_ERROR_CODE defn to avert compiler error in drm

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Message-ID: <20110507030803.GA18069@dumpdata.com>
Date:	Fri, 6 May 2011 23:08:03 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Cc:	mcree@...on.net.nz, linux-kernel@...r.kernel.org,
	linux-alpha@...r.kernel.org, mattst88@...il.com, rth@...ddle.net,
	ink@...assic.park.msu.ru
Subject: Re: [PATCH] alpha: Add DMA_ERROR_CODE defn to avert compiler error
 in drm

On Sat, May 07, 2011 at 09:05:50AM +0900, FUJITA Tomonori wrote:
> On Fri, 6 May 2011 09:49:25 -0400
> Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> wrote:
> 
> > On Fri, May 06, 2011 at 09:30:03PM +0900, FUJITA Tomonori wrote:
> > > On Wed,  4 May 2011 20:13:37 +1200
> > > Michael Cree <mcree@...on.net.nz> wrote:
> > > 
> > > > The radeon drm code now relies on DMA_ERROR_CODE.  This defines
> > > > it in alpha dma-mapping header to at least enable me to compile
> > > > radeon drm/kms into kernel.
> > > > 
> > > > Signed-off-by: Michael Cree <mcree@...on.net.nz>
> > > > ---
> > > >  arch/alpha/include/asm/dma-mapping.h |    2 ++
> > > >  1 files changed, 2 insertions(+), 0 deletions(-)
> > > 
> > > This isn't correct. The drivers should not use DMA_ERROR_CODE directly
> > > (some architecture specific drivers use it though). Fix rademon
> > > drm/kms instead.
> > 
> > What would be a proper value for non-existent bus addresses? As in the value
> > had not been set? 0?
> 
> Zero is a valid DMA address for some devices.

Ok, so what is an invalid DMA address?
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