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Re: FYI: mb(9) API is finally going away

To: tech-kern%NetBSD.org@localhost
Subject: Re: FYI: mb(9) API is finally going away
From: Taylor R Campbell <riastradh%NetBSD.org@localhost>
Date: Fri, 29 Nov 2019 22:36:02 +0000

The mb(9) API is now gone, except within sys/arch/mips where it is
used inside __cpu_simple_lock -- there were too many ifdefs across
components for me to disentangle, and the logic seems to be completely
bonkers, e.g. on Octeon __cpu_simple_unlock issues a memory barrier
_after_ the store to release the lock which makes no sense.

References:
- FYI: mb(9) API is finally going away
  - From: Taylor R Campbell

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