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Date:	Thu, 24 Jul 2014 10:45:22 +0100
From:	Luis Henriques <>
Cc:	Steven Rostedt <>,
	Luis Henriques <>
Subject: [PATCH 3.11 073/128] tracing: Remove ftrace_stop/start() from reading the trace file -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: Luis Henriques <>
 kernel/trace/trace.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 5f22856fd02a..c8b8717afc23 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -1323,7 +1323,6 @@ void tracing_start(void)
-	ftrace_start();
 	raw_spin_unlock_irqrestore(&global_trace.start_lock, flags);
@@ -1370,7 +1369,6 @@ 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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