tracing: Reset ftrace_graph_filter_enabled if count is zero

commit 9f50afccfdc15d95d7331acddcb0f7703df089ae upstream.

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>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index df92c8432b58c555b7cbdc133ef44a5fb3ccefeb..24b375996fc5153283cc366e1549366efd2982a1 100644 (file)
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -3303,7 +3303,8 @@ out:
        if (fail)
                return -EINVAL;
 
-       ftrace_graph_filter_enabled = 1;
+       ftrace_graph_filter_enabled = !!(*idx);
+
        return 0;
 }