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Date:	Mon,  7 Jul 2014 16:58:27 -0700
From:	Greg Kroah-Hartman <>
Cc:	Greg Kroah-Hartman <>,,
	Masami Hiramatsu <>,
	Steven Rostedt <>
Subject: [PATCH 3.10 42/53] tracing: Remove ftrace_stop/start() from reading the trace file

3.10-stable review patch.  If anyone has any objections, please let me know.


From: "Steven Rostedt (Red Hat)" <>

commit 099ed151675cd1d2dbeae1dac697975f6a68716d upstream.

Disabling reading and writing to the trace file should not be able to
disable all function tracing callbacks. There's other users today
(like kprobes and perf). Reading a trace file should not stop those
from happening.

Reviewed-by: Masami Hiramatsu <>
Signed-off-by: Steven Rostedt <>
Signed-off-by: Greg Kroah-Hartman <>

 kernel/trace/trace.c |    2 --
 1 file changed, 2 deletions(-)

--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -1306,7 +1306,6 @@ void tracing_start(void)
-	ftrace_start();
 	raw_spin_unlock_irqrestore(&global_trace.start_lock, flags);
@@ -1353,7 +1352,6 @@ void tracing_stop(void)
 	struct ring_buffer *buffer;
 	unsigned long flags;
-	ftrace_stop();
 	raw_spin_lock_irqsave(&global_trace.start_lock, flags);
 	if (global_trace.stop_count++)
 		goto out;

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