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In this case we call target function only on a single CPU and do not need any synchronization at the setup stage. It's a bit non-obvious but setup function of NULL means that smp_rendezvous_cpus waits for all CPUs to arrive at the rendezvous point, but without doing any actual setup. While using smp_no_rendevous_barrier means that each CPU proceeds on its own schedule without any synchronization whatsoever. MFC after: 3 weeks |
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