On Fri, Jun 07, 2019 at 09:34:32AM -0300, Jason Gunthorpe wrote: > CH also pointed out a more elegant solution, which is to get the write > side of the mmap_sem during hmm_mirror_unregister - no notifier > callback can be running in this case. Then we delete the kref, srcu > and so forth. Oops, it turns out this is only the case for invalidate_start/end, not release, so this doesn't help with the SRCU unless we also change exit_mmap to call release with the mmap sem held. So I think we have to stick with this for now. Jason
