Messages in this thread | | | Date | Wed, 28 Feb 2018 10:26:14 +0200 | From | Mike Rapoport <> | Subject | Re: [PATCH 3/3] userfaultfd: non-cooperative: allow synchronous EVENT_REMOVE |
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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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