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Because rcu_barrier() needs to be called as many times as the number of nested call_rcu() calls (call_rcu() calls made from call_rcu thread), and currently there's no mechanism to detect whether there are more call_rcu callbacks scheduled, we simply call the rcu_barrier() multiple times. The overhead is negligible and it prevents rare assertion failures caused by the check for memory leaks in isc__mem_destroy(). |
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