-struct call_rcu_data *get_default_call_rcu_data(void);
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- Returns the handle of the default call_rcu() helper thread.
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-struct call_rcu_data *get_call_rcu_data(void);
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- Returns the handle of the current thread's call_rcu() helper
- thread, which might well be the default helper thread.
- get_call_rcu_data should be called from registered RCU read-side
- threads. For the QSBR flavor, the caller should be online.
-