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authorMike Frysinger <vapier@gentoo.org>2010-01-22 07:35:20 -0500
committerMike Frysinger <vapier@gentoo.org>2010-03-09 00:30:50 -0500
commitaebfef03249819886a7f9c981940cbd48d82ea47 (patch)
tree95f436dac29ef51e20d61e2a66ffafdfc6ef1cc7 /arch/blackfin
parent6388d14eb2dd3af655cee28ca2a1c56881e63e56 (diff)
Blackfin: implement ftrace mcount test
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'arch/blackfin')
-rw-r--r--arch/blackfin/Kconfig1
-rw-r--r--arch/blackfin/kernel/ftrace-entry.S11
2 files changed, 11 insertions, 1 deletions
diff --git a/arch/blackfin/Kconfig b/arch/blackfin/Kconfig
index f46db59eac8a..3123aa49ff79 100644
--- a/arch/blackfin/Kconfig
+++ b/arch/blackfin/Kconfig
@@ -25,6 +25,7 @@ config BLACKFIN
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 76dd4fbcd17a..db3a51b0af21 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;