On Fri, Oct 13, 2017 at 8:44 AM, Dan Williams <dan.j.williams@xxxxxxxxx> wrote: > On Fri, Oct 13, 2017 at 12:12 AM, Christoph Hellwig <hch@xxxxxxxxxxxxx> wrote: >> So did we settle on the new mmap_validate vs adding a new argument >> to ->mmap for real now? I have to say I'd much prefer passing an >> additional argument instead, but if higher powers rule that out >> this version is ok. > > MAP_DIRECT also needs the fd now, so it would be two arguments. Before > you say "that's bogus" I want to understand what the alternative looks > like for notifying userspace that its get_user_pages() registration > lease is being invalidated. > Jason straightened me out about how RDMA applications expect to get notifications and now I see why the fd based scheme is lacking.
