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rcu: Let the world know when RCU adjusts its geometry
Some RCU bugs have been specific to the layout of the rcu_node tree, but RCU will silently adjust the tree at boot time if appropriate. This obscures valuable debugging information, so print a message when this happens. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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@ -3391,6 +3391,8 @@ static void __init rcu_init_geometry(void)
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if (rcu_fanout_leaf == CONFIG_RCU_FANOUT_LEAF &&
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nr_cpu_ids == NR_CPUS)
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return;
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pr_info("RCU: Adjusting geometry for rcu_fanout_leaf=%d, nr_cpu_ids=%d\n",
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rcu_fanout_leaf, nr_cpu_ids);
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/*
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* Compute number of nodes that can be handled an rcu_node tree
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