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smp_rendezvous() works for UP case as well, reduce duplicated

Description

smp_rendezvous() works for UP case as well, reduce duplicated
code. Also fix cast and remove unneeded XXX in comment.

Noted and reviewed by: jhb
Sponsored by: The FreeBSD Foundation
MFC after: 2 weeks
Differential revision: https://reviews.freebsd.org/D9657

Details

Provenance
kibAuthored on
Differential Revision
D9657: More cleanups of x86_mem.c.
Parents
rS313901: sx: fix mips builld after r313855
Branches
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