On Tue, Sep 19, 2023 at 12:01:57PM -0700, Axel Rasmussen wrote: > This process is critical for programs which depend on extra features, so > it's worth mentioning here. > > Future commits will much more fully describe it in ioctl_userfaultfd.2. > > Signed-off-by: Axel Rasmussen <axelrasmussen@xxxxxxxxxx> Reviewed-by: Mike Rapoport (IBM) <rppt@xxxxxxxxxx> > --- > man2/userfaultfd.2 | 5 +++-- > 1 file changed, 3 insertions(+), 2 deletions(-) > > diff --git a/man2/userfaultfd.2 b/man2/userfaultfd.2 > index 40354065c..1b2af22f9 100644 > --- a/man2/userfaultfd.2 > +++ b/man2/userfaultfd.2 > @@ -200,8 +200,9 @@ the application must enable it using the > .B UFFDIO_API > .BR ioctl (2) > operation. > -This operation allows a handshake between the kernel and user space > -to determine the API version and supported features. > +This operation allows a two-step handshake between the kernel and user space > +to determine what API version and features the kernel supports, > +and then to enable those features user space wants. > This operation must be performed before any of the other > .BR ioctl (2) > operations described below (or those operations fail with the > -- > 2.42.0.459.ge4e396fd5e-goog > > -- Sincerely yours, Mike.
