On Mon, Oct 15, 2018 at 12:34:02PM +1100, Alexey Kardashevskiy wrote: > > On 10/10/2018 00:24, Christoph Hellwig wrote: > > This code has been unused since it was merged and is in the way of > > cleaning up the DMA code, thus remove it. > > > > This effectively reverts commit 5d2aa710 ("powerpc/powernv: Add support > > for Nvlink NPUs"). > > > This code is heavily used by the NVIDIA GPU driver. Not by the that actually exists in the kernel tree, so it simply doesn't matter.