[LTP] [PATCH v3] syscall: Add userfaultfd testcase

[Jan Stancek <jstancek@redhat.com>]

----- Original Message -----
> This tests the userfaultfd syscall to handle pagefault events.
> It does so by registering a userfaultfd object to the address of
> a memory page. In a second thread it handles the event and writes
> data in the monitored memory page to indicate success.
> 
> Signed-off-by: Christian Amann <camann@suse.com>

Acked-by: Jan Stancek <jstancek@redhat.com>

Couple small nits below (no need to repost).

syscall -> syscalls in subject

> +
> +static int userfaultfd(int flags)

If glibc ever provides func, my money would be on this :-).
But looking at HEAD, we're safe now.

Thanks,
Jan