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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2015-06-04 10:06:01 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2015-07-17 14:58:41 -0700
commit13bd64947f53ba8d7199922be94b6626b8e222d7 (patch)
tree8850f4b145b481d192ec609c55d8611758e9692f
parent032dfc87225c96ec1771e5967436c4b23d1dc5d6 (diff)
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>
-rw-r--r--kernel/rcu/tree.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index e53bbc53bcd5..a2147d7b51c0 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -4103,6 +4103,7 @@ static void __init rcu_init_geometry(void)
*/
if (rcu_fanout_leaf < RCU_FANOUT_LEAF ||
rcu_fanout_leaf > sizeof(unsigned long) * 8) {
+ rcu_fanout_leaf = RCU_FANOUT_LEAF;
WARN_ON(1);
return;
}