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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) <rostedt@goodmis.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Steven Rostedt (VMware) 2017-10-12 18:16:41 -04:00 committed by Paul E. McKenney
parent d633198088
commit 9122caf99b
1 changed files with 2 additions and 0 deletions
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2
include/trace/events/rcu.h
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@ -243,6 +243,7 @@ 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.
@ -285,6 +286,7 @@ 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