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If the physical clock supports cross timestamping (it has the getcrosststamp() function), provide a wrapper in the virtual clock to enable cross timestamping. This adds support for the PTP_SYS_OFFSET_PRECISE ioctl. Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com> Acked-by: Richard Cochran <richardcochran@gmail.com> Cc: Yangbo Lu <yangbo.lu@nxp.com> Signed-off-by: David S. Miller <davem@davemloft.net>