On Tue, Nov 07, 2017 at 07:58:05AM -0800, Christoph Hellwig wrote: > On Tue, Nov 07, 2017 at 08:48:38AM -0700, Jason Gunthorpe wrote: > > Can't you just use vmalloc and dma_map that? Other drivers follow that > > approach.. > > You can't easily due to the flushing requirements. We used to do that > in XFS and it led to problems. You need the page allocator + vmap + > invalidate_kernel_vmap_range + flush_kernel_vmap_range to get the > cache flushing right.
Yes, exactly something ugly like that.. :\ Jason
