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由 Paul E. McKenney 提交于
This commit adds a Quick Quiz whose answer explains why the compiler code reordering enabled by CONFIG_PREEMPT=n's empty rcu_read_lock() and rcu_read_unlock() functions does not hinder RCU's ability to figure out which RCU read-side critical sections have completed and not. Signed-off-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com>d8936c0b