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rcu: Reset rcu_fanout_leaf if out of bounds
Currently if the rcu_fanout_leaf boot parameter is out of bounds (that is, less than RCU_FANOUT_LEAF or greater than the number of bits in an unsigned long), a warning is issued and execution continues with the out-of-bounds value. This can result in all manner of failures, so this patch resets rcu_fanout_leaf to RCU_FANOUT_LEAF when an out-of-bounds condition is detected. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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@ -4103,6 +4103,7 @@ static void __init rcu_init_geometry(void)
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*/
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if (rcu_fanout_leaf < RCU_FANOUT_LEAF ||
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rcu_fanout_leaf > sizeof(unsigned long) * 8) {
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rcu_fanout_leaf = RCU_FANOUT_LEAF;
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WARN_ON(1);
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return;
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}
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