tree 6d46f223a177ada92c6f47c36ba2e51cd6041037
parent 0296e4254f3318e0dcad9706fa1daf8e5addc1e9
author Li Zefan <lizf@cn.fujitsu.com> 1246006551 +0800
committer Ingo Molnar <mingo@elte.hu> 1246042119 +0200

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>