From: Steven Rostedt <srostedt@redhat.com>
Date: Wed, 18 Mar 2009 00:58:00 +0000 (-0400)
Subject: tracing: make power tracer start/stop methods lighter weight
X-Git-Tag: firefly_0821_release~13991^2~224^2
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=62524d55e5b9ffe36e3bf3dd7a594114f150b449;p=firefly-linux-kernel-4.4.55.git

tracing: make power tracer start/stop methods lighter weight

The start/stop methods of a tracer should be able to be executed
in all contexts. This patch converts the power tracer to do so.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
---

diff --git a/kernel/trace/trace_power.c b/kernel/trace/trace_power.c
index 91ce672fb037..bae791ebcc51 100644
--- a/kernel/trace/trace_power.c
+++ b/kernel/trace/trace_power.c
@@ -122,10 +122,14 @@ fail_start:
 static void start_power_trace(struct trace_array *tr)
 {
 	trace_power_enabled = 1;
-	tracing_power_register();
 }
 
 static void stop_power_trace(struct trace_array *tr)
+{
+	trace_power_enabled = 0;
+}
+
+static void power_trace_reset(struct trace_array *tr)
 {
 	trace_power_enabled = 0;
 	unregister_trace_power_start(probe_power_start);
@@ -188,7 +192,7 @@ static struct tracer power_tracer __read_mostly =
 	.init		= power_trace_init,
 	.start		= start_power_trace,
 	.stop		= stop_power_trace,
-	.reset		= stop_power_trace,
+	.reset		= power_trace_reset,
 	.print_line	= power_print_line,
 };