commit 5d4a9dba2d7fbab69f00dedd430d1788834a055a
author Steven Rostedt <srostedt@redhat.com> Thu Aug 27 16:52:21 2009 -0400
committer Steven Rostedt <rostedt@goodmis.org> Thu Aug 27 16:58:05 2009 -0400
tree a57ec209fc1ac86d7acbd67164b068ecdadd6317
parent c0729be99cb2b9d9749256254f1c40a801835896

tracing: only show tracing_max_latency when latency tracer configured

The tracing_max_latency file should only be present when one of the
latency tracers ({preempt|irqs}off, wakeup*) are enabled.

This patch also removes tracing_thresh when latency tracers are not
enabled, as well as compiles out code that is only used for latency
tracers.

Reported-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

kernel/trace/trace.h

diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 654fd65..e2c06b2 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -473,12 +473,14 @@
 
 extern unsigned long nsecs_to_usecs(unsigned long nsecs);
 
+#ifdef CONFIG_TRACER_MAX_TRACE
 extern unsigned long tracing_max_latency;
 extern unsigned long tracing_thresh;
 
 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
 void update_max_tr_single(struct trace_array *tr,
 			  struct task_struct *tsk, int cpu);
+#endif /* CONFIG_TRACER_MAX_TRACE */
 
 #ifdef CONFIG_STACKTRACE
 void ftrace_trace_stack(struct trace_array *tr, unsigned long flags,