[PATCH 2/8] ftrace: define function trace nop

[Steven Rostedt <rostedt@goodmis.org>]

[-- Attachment #1: ftrace-function-record-nop.patch --]
[-- Type: text/plain, Size: 1298 bytes --]

When CONFIG_FTRACE is not enabled, the tracing_start_functon_trace
and tracing_stop_function_trace should be nops.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
---
 kernel/trace/trace.h |   10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

Index: linux-tip.git/kernel/trace/trace.h
===================================================================
--- linux-tip.git.orig/kernel/trace/trace.h	2008-06-26 14:58:55.000000000 -0400
+++ linux-tip.git/kernel/trace/trace.h	2008-06-30 22:39:15.000000000 -0400
@@ -216,8 +216,6 @@ void trace_function(struct trace_array *
 		    unsigned long parent_ip,
 		    unsigned long flags);
 
-void tracing_start_function_trace(void);
-void tracing_stop_function_trace(void);
 void tracing_start_cmdline_record(void);
 void tracing_stop_cmdline_record(void);
 int register_tracer(struct tracer *type);
@@ -234,6 +232,14 @@ void update_max_tr_single(struct trace_a
 
 extern cycle_t ftrace_now(int cpu);
 
+#ifdef CONFIG_FTRACE
+void tracing_start_function_trace(void);
+void tracing_stop_function_trace(void);
+#else
+# define tracing_start_function_trace()		do { } while (0)
+# define tracing_stop_function_trace()		do { } while (0)
+#endif
+
 #ifdef CONFIG_CONTEXT_SWITCH_TRACER
 typedef void
 (*tracer_switch_func_t)(void *private,

--