Add ftrace_enabled_save/restore, used to disable ftrace for a
while. This is used by kexec jump.
Signed-off-by: Huang Ying <ying.huang at intel.com>
---
include/linux/ftrace.h | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -98,6 +98,24 @@ static inline void tracer_disable(void)
#endif
}
+static inline int ftrace_enabled_save(void)
+{
+#ifdef CONFIG_FTRACE
+ int saved_ftrace_enabled = ftrace_enabled;
+ ftrace_enabled = 0;
+ return saved_ftrace_enabled;
+#else
+ return 0;
+#endif
+}
+
+static inline void ftrace_enabled_restore(int enabled)
+{
+#ifdef CONFIG_FTRACE
+ ftrace_enabled = enabled;
+#endif
+}
+
#ifdef CONFIG_FRAME_POINTER
/* TODO: need to fix this for ARM */
# define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
