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Remove the explicit call_rcu thread creating and destruction

Ondřej Surý requested to merge 4163-dont-create-and-destroy-call_rcu-threads-by-hand into main

The free_all_cpu_call_rcu_data() call can consume hundreds of milliseconds on shutdown. Don't try to be smart and let the RCU library handle this internally.

Closes #4163 (closed)

Edited by Ondřej Surý

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