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

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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@xxxxxxxxxxxx> 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@xxxxxxxxxxxx>
> > ---
> >  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?
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