Commit 13bd6494 authored Jun 04, 2015 by Paul E. McKenney

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>

parent 032dfc87

kernel/rcu/tree.c

+1 −0

Original line number	Original line	Diff line number	Diff line
	@@ -4103,6 +4103,7 @@ static void __init rcu_init_geometry(void)
	*/		*/
	if (rcu_fanout_leaf < RCU_FANOUT_LEAF \|\|		if (rcu_fanout_leaf < RCU_FANOUT_LEAF \|\|
	rcu_fanout_leaf > sizeof(unsigned long) * 8) {		rcu_fanout_leaf > sizeof(unsigned long) * 8) {
			rcu_fanout_leaf = RCU_FANOUT_LEAF;
	WARN_ON(1);		WARN_ON(1);
	return;		return;
	}		}