From: Li Zefan <lizf@cn.fujitsu.com>
Date: Fri, 26 Jun 2009 08:55:51 +0000 (+0800)
Subject: tracing: Fix stack tracer sysctl handling
X-Git-Tag: v2.6.31-rc3~35^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a32c7765e2796395aec49f699bd25c407155e9c5;p=pandora-kernel.git

tracing: Fix stack tracer sysctl handling

This made my machine completely frozen:

  # echo 1 > /proc/sys/kernel/stack_tracer_enabled
  # echo 2 > /proc/sys/kernel/stack_tracer_enabled

The cause is register_ftrace_function() was called twice.

Also fix ftrace_enabled sysctl, though seems nothing bad happened
as I tested it.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <4A448D17.9010305@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

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