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authorSteven Rostedt (Red Hat) <rostedt@goodmis.org>2013-08-31 01:04:07 -0400
committerSteven Rostedt <rostedt@goodmis.org>2013-09-05 09:31:33 -0400
commita0a5a0561f63905fe94c49bc567615829f42ce1e (patch)
tree25b3136d404317ee0298a7387cc7afdd90f34089
parentaf058ab04d3d11383e5159132fc78a3700be3af5 (diff)
downloadlinux-rt-a0a5a0561f63905fe94c49bc567615829f42ce1e.tar.gz
ftrace/rcu: Do not trace debug_lockdep_rcu_enabled()
The function debug_lockdep_rcu_enabled() is part of the RCU lockdep debugging, and is called very frequently. I found that if I enable a lot of debugging and run the function graph tracer, this function can cause a live lock of the system. We don't usually trace lockdep infrastructure, no need to trace this either. Reviewed-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
-rw-r--r--kernel/rcupdate.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/rcupdate.c b/kernel/rcupdate.c
index cce6ba8bbace..4f20c6c6a848 100644
--- a/kernel/rcupdate.c
+++ b/kernel/rcupdate.c
@@ -122,7 +122,7 @@ struct lockdep_map rcu_sched_lock_map =
STATIC_LOCKDEP_MAP_INIT("rcu_read_lock_sched", &rcu_sched_lock_key);
EXPORT_SYMBOL_GPL(rcu_sched_lock_map);
-int debug_lockdep_rcu_enabled(void)
+int notrace debug_lockdep_rcu_enabled(void)
{
return rcu_scheduler_active && debug_locks &&
current->lockdep_recursion == 0;