Re: [PATCH 3/3] userfaultfd: non-cooperative: allow synchronous EVENT_REMOVE
From: Mike Rapoport <hidden>
Date: 2018-02-28 08:26:23
Also in:
linux-mm, lkml
On Wed, Feb 28, 2018 at 11:21:02AM +0300, Pavel Emelyanov wrote:
quoted
@@ -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.