On Fri, Jan 15, 2021 at 11:04:48AM -0800, Axel Rasmussen wrote: > As the comment says: for the MINOR fault use case, although the page > might be present and populated in the other (non-UFFD-registered) half > of the shared mapping, it may be out of date, and we explicitly want > userspace to get a minor fault so it can check and potentially update > the page's contents. > > Huge PMD sharing would prevent these faults from occurring for > suitably aligned areas, so disable it upon UFFD registration. > > Signed-off-by: Axel Rasmussen <axelrasmussen@xxxxxxxxxx> Reviewed-by: Peter Xu <peterx@xxxxxxxxxx> -- Peter Xu
