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rcu: Fix outdated rcu_scheduler_active comment
The comment header for rcu_scheduler_active states that it is used to optimize synchronize_sched() at early boot. This is incorrect. The synchronize_sched() function instead checks the number of online CPUs. This commit therefore replaces the comment's synchronize_sched() with synchronize_rcu(), which really does use rcu_scheduler_active for this purpose. Reported-by: Lihao Liang <lihao.liang@gmail.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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@ -130,7 +130,7 @@ int rcu_num_nodes __read_mostly = NUM_RCU_NODES; /* Total # rcu_nodes in use. */
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* The rcu_scheduler_active variable transitions from zero to one just
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* before the first task is spawned. So when this variable is zero, RCU
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* can assume that there is but one task, allowing RCU to (for example)
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* optimize synchronize_sched() to a simple barrier(). When this variable
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* optimize synchronize_rcu() to a simple barrier(). When this variable
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* is one, RCU must actually do all the hard work required to detect real
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* grace periods. This variable is also used to suppress boot-time false
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* positives from lockdep-RCU error checking.
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