ftrace: Do no disable function tracing on enabling function tracing

When function tracing is being updated function_trace_stop is set to
keep from tracing the updates. This was fine when function tracing
was done from stop machine. But it is no longer done that way and
this can cause real tracing to be missed.

Remove it.

Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 8063280fd53d4070f02b6dc2fdf3ecc5cf9ca79e..0fa1b87db95c7cc8aeca974cb4cc32ae5ec582d3 100644 (file)
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -2261,11 +2261,6 @@ static void ftrace_run_update_code(int command)
        FTRACE_WARN_ON(ret);
        if (ret)
                return;
-       /*
-        * Do not call function tracer while we update the code.
-        * We are in stop machine.
-        */
-       function_trace_stop++;
 
        /*
         * By default we use stop_machine() to modify the code.
@@ -2275,8 +2270,6 @@ static void ftrace_run_update_code(int command)
         */
        arch_ftrace_update_code(command);
 
-       function_trace_stop--;
-
        ret = ftrace_arch_code_modify_post_process();
        FTRACE_WARN_ON(ret);