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Use of smp_rendezvous_cpus() instead of sched_bind() allows to not
block indefinitely if target CPU is running some thread with higher
priority, while all we need is single rdmsr/wrmsr instruction call.
I guess it should also be much cheaper than full thread migration.
MFC after: 2 weeks
Sponsored by: iXsystems, Inc.
(cherry picked from commit
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