Re: [PATCH] powerpc: Fix swiotlb ops for ppc64

[Benjamin Herrenschmidt <benh@kernel.crashing.org>]

On Mon, 2011-12-12 at 21:55 -0600, Becky Bruce wrote:
> 1) dma_direct_alloc_coherent strips GFP_HIGHMEM out of the flags field
> when calling the actual allocator and the iotlb version does not.  I
> don't know how much this matters - I did a quick grep and I don't see
> any users that specify that, but somebody went through the trouble of
> putting it in there in the first place and without knowing why I
> wasn't willing to get rid of it.  Now, since my patch it looks like
> someone added a VM_BUG_ON into __get_free_pages() if GFP_HIGHMEM so
> this would get caught.  However, I don't know if we really want to
> throw a bug there.
> 
> 2)  The iotlb code doesn't deal with the !coherent parts like 8xx.  We
> can work around that by setting up the dma_ops differently for that
> case instead.

Does the rest of it handle them ? I mean swiotlb_map_sg_attrs etc...

If not then it's broken anyway so may as well not care for now.

Cheers,
Ben.