Re: [RFC PATCH 6/6] sparc64: Enable 64-bit DMA

From: Christoph Hellwig
Date: Fri Oct 07 2016 - 03:33:19 EST

On Thu, Oct 06, 2016 at 04:33:36PM -0700, Tushar Dave wrote:
> ATU 64bit addressing allows PCIe devices with 64bit DMA capabilities
> to use ATU for 64bit DMA.

Any chance to always enable this? Last I checked sparc was the only
architecture still using a 32-bit dma_addr_t, leading to some fun
breakage in things like the software RDMA drivers that abuse it to
store a kernel pointer..