tracing, rcu: Hide trace event rcu_nocb_wake when not used

The trace event rcu_nocb_wake is only used when CONFIG_RCU_NOCB_CPU is defined. But the trace event is defined regardless. As defined trace events take up memory, it is a waste to have it defined when not used. Surround the trace event with an #ifdef to have it only defined when it is used. Signed-off-by: Steven Rostedt (VMware) <[email protected]> Signed-off-by: Paul E. McKenney <[email protected]>
grate-driver · Oct 17, 2017 · a921eff · a921eff
1 parent 22010a8
commit a921eff
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/include/trace/events/rcu.h b/include/trace/events/rcu.h
@@ -242,6 +242,7 @@ TRACE_EVENT(rcu_exp_funnel_lock,
 		  __entry->grphi, __entry->gpevent)
 );
 
+#ifdef CONFIG_RCU_NOCB_CPU
 /*
  * Tracepoint for RCU no-CBs CPU callback handoffs.  This event is intended
  * to assist debugging of these handoffs.
@@ -284,6 +285,7 @@ TRACE_EVENT(rcu_nocb_wake,
 
 	TP_printk("%s %d %s", __entry->rcuname, __entry->cpu, __entry->reason)
 );
+#endif
 
 /*
  * Tracepoint for tasks blocking within preemptible-RCU read-side