tracing: Reset ftrace_graph_filter_enabled if count is zero

The ftrace_graph_count can be decreased with a "!" pattern, so that
the enabled flag should be updated too.

Link: http://lkml.kernel.org/r/1365663698-2413-1-git-send-email-namhyung@kernel.org
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Namhyung Kim <namhyung.kim@lge.com>
Cc: stable@vger.kernel.org
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index c9f31491009fbcb82f6662f037ed1c6f1d56a812..9e3198782507dfb0f3417d9e02ab92a6eb375378 100644 (file)
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -3792,7 +3792,8 @@ out:
        if (fail)
                return -EINVAL;
 
-       ftrace_graph_filter_enabled = 1;
+       ftrace_graph_filter_enabled = !!(*idx);
+
        return 0;
 }