Mateusz Guzik 889a9acc54 ipsec: only update lastused when it changes
to limit cache-line bouncing.

Note that as there is no atomic_store we are hoping the compiler wont
speculatively do the store. It is not employed because the size depends
on target arch.

Sponsored by:	Rubicon Communications, LLC ("Netgate")
Differential Revision:	https://reviews.freebsd.org/D38433
2023-02-16 07:33:51 +00:00
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