From: Willem de Bruijn <willemdebruijn.kernel@gmail.com>
Date: Sun, 25 Nov 2018 09:18:55 -0500

The existing logic is as is for a reason. There is no need to change
it to satisfy the main purpose of your patchset?

It is structured as one bit to test whether a timestamp is requested
and another to select among two variants usec/nsec. Just add another
layer of branching between new/old in cases where this distinction is
needed.

Please avoid code churn unless needed.

+1