From mboxrd@z Thu Jan  1 00:00:00 1970
From: Pavel Emelyanov <xemul@virtuozzo.com>
Subject: Re: [PATCH 3/3] userfaultfd: non-cooperative: allow synchronous
 EVENT_REMOVE
Date: Wed, 28 Feb 2018 11:21:02 +0300
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> @@ -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?

-- Pavel