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SubjectRe: [PATCH 3/3] userfaultfd: non-cooperative: allow synchronous EVENT_REMOVE
On Wed, Feb 28, 2018 at 11:21:02AM +0300, Pavel Emelyanov wrote:
>
> > @@ -52,6 +53,7 @@
> > #define _UFFDIO_WAKE (0x02)
> > #define _UFFDIO_COPY (0x03)
> > #define _UFFDIO_ZEROPAGE (0x04)
> > +#define _UFFDIO_WAKE_SYNC_EVENT (0x05)
>
> Excuse my ignorance, but what's the difference between UFFDIO_WAKE and UFFDIO_WAKE_SYNC_EVENT?

UFFDIO_WAKE is used when UFFDIO_COPY/UFFDIO_ZERO page are used with
UFFDIO_*_MODE_DONTWAKE flag set and it presumes 'struct uffdio_range'
argument to the ioctl(). Since waking up a non page fault event requires
different parameters I've add new ioctl to keep backwards compatibility.

> -- Pavel
>

--
Sincerely yours,
Mike.

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