linux-kernel - [Patch 1/3] Tracing/ftrace: Make nop tracer reset previous entries

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Message-ID: <48D68E06.50504@gmail.com>
Date:	Sun, 21 Sep 2008 20:10:14 +0200
From:	Frédéric Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Linux Kernel <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Steven Noonan <steven@...inklabs.net>
Subject: [Patch 1/3] Tracing/ftrace: Make nop tracer reset previous entries

If nop tracer is selected, some old entries from the previous tracer could still be enqueued. Tracing have to be reset.

Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
---
diff -rup linux-2.6-tip (2)/kernel/trace/trace_nop.c linux-2.6-tip/kernel/trace/trace_nop.c
--- linux-2.6-tip (2)/kernel/trace/trace_nop.c	2008-09-19 18:01:26.000000000 +0200
+++ linux-2.6-tip/kernel/trace/trace_nop.c	2008-09-21 00:44:47.000000000 +0200
@@ -25,8 +25,12 @@ static void stop_nop_trace(struct trace_
 }

 

 static void nop_trace_init(struct trace_array *tr)

-{

-	ctx_trace = tr;

+{
+	int cpu;

+	ctx_trace = tr;
+
+	for_each_online_cpu(cpu)

+		tracing_reset(tr->data[cpu]);

 

 	if (tr->ctrl)

 		start_nop_trace(tr);
--
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