rcu: allow RCU CPU stall warning messages to be controlled in /sys
authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Wed, 14 Jul 2010 21:38:30 +0000 (14:38 -0700)
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Fri, 20 Aug 2010 00:18:03 +0000 (17:18 -0700)
Set the permissions of the rcu_cpu_stall_suppress to 644 to enable RCU
CPU stall warnings to be enabled and disabled at runtime via sysfs.

Suggested-by: Josh Triplett <josh@joshtriplett.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
kernel/rcutree.c

index f3d5906cbc215bff9de6de00b9be952d03f589cc..5d910beefff2734251074dc04e4a21e1f355ee66 100644 (file)
@@ -145,7 +145,7 @@ module_param(qlowmark, int, 0);
 
 #ifdef CONFIG_RCU_CPU_STALL_DETECTOR
 int rcu_cpu_stall_suppress __read_mostly;
-module_param(rcu_cpu_stall_suppress, int, 0);
+module_param(rcu_cpu_stall_suppress, int, 0644);
 #endif /* #ifdef CONFIG_RCU_CPU_STALL_DETECTOR */
 
 static void force_quiescent_state(struct rcu_state *rsp, int relaxed);