On Wed, Mar 20, 2019 at 10:06:36AM +0800, Peter Xu wrote: > From: Shaohua Li <shli@xxxxxx> > > Now it's safe to enable write protection in userfaultfd API > > Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx> > Cc: Pavel Emelyanov <xemul@xxxxxxxxxxxxx> > Cc: Rik van Riel <riel@xxxxxxxxxx> > Cc: Kirill A. Shutemov <kirill@xxxxxxxxxxxxx> > Cc: Mel Gorman <mgorman@xxxxxxx> > Cc: Hugh Dickins <hughd@xxxxxxxxxx> > Cc: Johannes Weiner <hannes@xxxxxxxxxxx> > Signed-off-by: Shaohua Li <shli@xxxxxx> > Signed-off-by: Andrea Arcangeli <aarcange@xxxxxxxxxx> > Reviewed-by: Jerome Glisse <jglisse@xxxxxxxxxx> > Signed-off-by: Peter Xu <peterx@xxxxxxxxxx> Reviewed-by: Mike Rapoport <rppt@xxxxxxxxxxxxx> > --- > include/uapi/linux/userfaultfd.h | 6 ++++-- > 1 file changed, 4 insertions(+), 2 deletions(-) > > diff --git a/include/uapi/linux/userfaultfd.h b/include/uapi/linux/userfaultfd.h > index 95c4a160e5f8..e7e98bde221f 100644 > --- a/include/uapi/linux/userfaultfd.h > +++ b/include/uapi/linux/userfaultfd.h > @@ -19,7 +19,8 @@ > * means the userland is reading). > */ > #define UFFD_API ((__u64)0xAA) > -#define UFFD_API_FEATURES (UFFD_FEATURE_EVENT_FORK | \ > +#define UFFD_API_FEATURES (UFFD_FEATURE_PAGEFAULT_FLAG_WP | \ > + UFFD_FEATURE_EVENT_FORK | \ > UFFD_FEATURE_EVENT_REMAP | \ > UFFD_FEATURE_EVENT_REMOVE | \ > UFFD_FEATURE_EVENT_UNMAP | \ > @@ -34,7 +35,8 @@ > #define UFFD_API_RANGE_IOCTLS \ > ((__u64)1 << _UFFDIO_WAKE | \ > (__u64)1 << _UFFDIO_COPY | \ > - (__u64)1 << _UFFDIO_ZEROPAGE) > + (__u64)1 << _UFFDIO_ZEROPAGE | \ > + (__u64)1 << _UFFDIO_WRITEPROTECT) > #define UFFD_API_RANGE_IOCTLS_BASIC \ > ((__u64)1 << _UFFDIO_WAKE | \ > (__u64)1 << _UFFDIO_COPY) > -- > 2.17.1 > -- Sincerely yours, Mike.
