On 2/18/21 4:48 PM, 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 of the mapping, it may be out of date, and we explicitly want userspace 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. > > Reviewed-by: Peter Xu <peterx@xxxxxxxxxx> > Signed-off-by: Axel Rasmussen <axelrasmussen@xxxxxxxxxx> Thanks, Reviewed-by: Mike Kravetz <mike.kravetz@xxxxxxxxxx> -- Mike Kravetz
