linux-kernel - [PATCH 1/2] tracing, thermal: Hide devfreq trace events when not in use

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Date:   Fri, 13 Oct 2017 10:21:50 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Javi Merino <javi.merino@....com>,
        Eduardo Valentin <edubezval@...il.com>
Subject: [PATCH 1/2] tracing, thermal: Hide devfreq trace events when not in
 use

From: Steven Rostedt (VMware) <rostedt@...dmis.org>

As trace events when defined create data structures and functions to
process them, defining trace events when not using them is a waste of
memory.

The trace events thermal_power_devfreq_get_power and
thermal_power_devfreq_limit are only used when CONFIG_DEVFREQ_THERMAL
is set. Make those events only defined when that is set as well.

Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
---
Index: linux-trace.git/include/trace/events/thermal.h
===================================================================
--- linux-trace.git.orig/include/trace/events/thermal.h
+++ linux-trace.git/include/trace/events/thermal.h
@@ -148,6 +148,7 @@ TRACE_EVENT(thermal_power_cpu_limit,
 		__entry->power)
 );
 
+#ifdef CONFIG_DEVFREQ_THERMAL
 TRACE_EVENT(thermal_power_devfreq_get_power,
 	TP_PROTO(struct thermal_cooling_device *cdev,
 		 struct devfreq_dev_status *status, unsigned long freq,
@@ -203,6 +204,7 @@ TRACE_EVENT(thermal_power_devfreq_limit,
 		__get_str(type), __entry->freq, __entry->cdev_state,
 		__entry->power)
 );
+#endif /* CONFIG_DEVFREQ_THERMAL */
 #endif /* _TRACE_THERMAL_H */
 
 /* This part must be outside protection */