[Bug 237718] head -r346588 (and before -r347492) for powerpc64 on PowerMac G5 exposes: mtx_lock of spin mutex WWV @ .../sys/powerpc/aim/mmu_oea64.c

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237718

--- Comment #3 from Mark Millard <marklmi26-fbsd@yahoo.com> ---
(In reply to Justin Hibbits from comment #2)

The last of the PowerMac powerpc64's that I had access
to died back in 2021-Jan. I've not had powerpc64* access
since then. (Nor any powerpc use.)

So: I do not have a context to check on this with. I've
no clue what use of cmpb would end up doing on PPC970's
these days.

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