On Mon, Mar 01, 2021 at 09:44:13AM +0100, Daniel Vetter wrote: > On Mon, Mar 01, 2021 at 09:33:18AM +0100, Christoph Hellwig wrote: > > Hi all, > > > > i915 has some reason to want to avoid the track_pfn_remap overhead in > > remap_pfn_range. Add a function to the core VM to do just that rather > > than reinventing the functionality poorly in the driver. > > It's not _notrack it's "rely on the tracking established by the struct > io_mapping". Exporting a _notrack version to drivers sounds like not > something we want to ever do. So I think you want a helper which takes the > io_mapping, and not something that encourages drivers to go full stupid. As far as I can tell there is no struct io_mapping anywhere near remap_io_sg.
