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| author | Steven Rostedt (Red Hat) <rostedt@goodmis.org> | 2013-08-31 01:04:07 -0400 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2013-09-05 09:31:33 -0400 |
| commit | a0a5a0561f63905fe94c49bc567615829f42ce1e (patch) | |
| tree | 25b3136d404317ee0298a7387cc7afdd90f34089 | |
| parent | af058ab04d3d11383e5159132fc78a3700be3af5 (diff) | |
| download | linux-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.c | 2 |
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; |