From: Nikolay Aleksandrov
> Sent: 20 September 2016 10:06
> When I introduced the lastuse member I made a subtle error because it was
> returned as an absolute value but that is meaningless to user-space as it
> doesn't allow to see how old exactly an entry is. Let's make it similar to
> how the bridge returns such values and make it relative to "now" (jiffies).
> This allows us to show the actual age of the entries and is much more
> useful (e.g. user-space daemons can age out entries, iproute2 can display
> the lastuse properly).
> + jiffies_to_clock_t(jiffies -
> + c->mfc_un.res.lastuse),
You probably need to ensure the 'age' isn't negative because
'lastuse' got updated after 'jiffies' was read and there was
a clock interrupt in the gap.