Blackfin: implement ftrace mcount test
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/arch/blackfin/Kconfig b/arch/blackfin/Kconfig
index f46db59..3123aa4 100644
--- a/arch/blackfin/Kconfig
+++ b/arch/blackfin/Kconfig
@@ -25,6 +25,7 @@
def_bool y
select HAVE_FUNCTION_GRAPH_TRACER
select HAVE_FUNCTION_TRACER
+ select HAVE_FUNCTION_TRACE_MCOUNT_TEST
select HAVE_IDE
select HAVE_KERNEL_GZIP if RAMKERNEL
select HAVE_KERNEL_BZIP2 if RAMKERNEL
diff --git a/arch/blackfin/kernel/ftrace-entry.S b/arch/blackfin/kernel/ftrace-entry.S
index 76dd4fb..db3a51b 100644
--- a/arch/blackfin/kernel/ftrace-entry.S
+++ b/arch/blackfin/kernel/ftrace-entry.S
@@ -1,7 +1,7 @@
/*
* mcount and friends -- ftrace stuff
*
- * Copyright (C) 2009 Analog Devices Inc.
+ * Copyright (C) 2009-2010 Analog Devices Inc.
* Licensed under the GPL-2 or later.
*/
@@ -21,6 +21,15 @@
* function will be waiting there. mmmm pie.
*/
ENTRY(__mcount)
+#ifdef CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST
+ /* optional micro optimization: return if stopped */
+ p1.l = _function_trace_stop;
+ p1.h = _function_trace_stop;
+ r3 = [p1];
+ cc = r3 == 0;
+ if ! cc jump _ftrace_stub (bp);
+#endif
+
/* save third function arg early so we can do testing below */
[--sp] = r2;