[PATCH v7 3/8] arm64: introduce is_device_dma_coherent

[Stefano Stabellini]

On Fri, 7 Nov 2014, Catalin Marinas wrote:
> On Fri, Nov 07, 2014 at 11:05:25AM +0000, Catalin Marinas wrote:
> > BTW, drivers/xen/swiotlb-xen.c needs something like:
> > 
> >         dma_addr_t dev_addr = xen_phys_to_bus(phys_to_dma(phys));
> > 
> > phys != bus address.
> 
> Wrong place, what I meant is when calling:
> 
>         xen_dma_unmap_page(hwdev, phys_to_dma(paddr), size, dir, attrs);

Well spotted! This is an actual mistake in the current code, independent
from the problem described before. Julien reported it a couple of days
ago and I have already queued a patch to fix it at the end of the
series.