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authorSteven Rostedt <srostedt@redhat.com>2012-07-20 13:08:05 -0400
committerSteven Rostedt <rostedt@goodmis.org>2012-07-31 10:29:54 -0400
commitea701f11da44b44907af226fe5a5f57d2f26eeb2 (patch)
treebed777e80fb81b28903fe4a64cb90164e499a178 /include/linux/ftrace.h
parent47239c4d8d6a24796039cada69d477a2b8cac9d6 (diff)
downloadop-kernel-dev-ea701f11da44b44907af226fe5a5f57d2f26eeb2.zip
op-kernel-dev-ea701f11da44b44907af226fe5a5f57d2f26eeb2.tar.gz
ftrace: Add selftest to test function trace recursion protection
Add selftests to test the function tracing recursion protection actually does work. It also tests if a ftrace_ops states it will perform its own protection. Although, even if the ftrace_ops states it will protect itself, the ftrace infrastructure may still provide protection if the arch does not support all features or another ftrace_ops is registered. Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'include/linux/ftrace.h')
-rw-r--r--include/linux/ftrace.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index 65a14e4..9962e95 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -220,6 +220,10 @@ extern void ftrace_stub(unsigned long a0, unsigned long a1,
*/
#define register_ftrace_function(ops) ({ 0; })
#define unregister_ftrace_function(ops) ({ 0; })
+static inline int ftrace_nr_registered_ops(void)
+{
+ return 0;
+}
static inline void clear_ftrace_function(void) { }
static inline void ftrace_kill(void) { }
static inline void ftrace_stop(void) { }
@@ -275,6 +279,8 @@ extern void unregister_ftrace_function_probe_all(char *glob);
extern int ftrace_text_reserved(void *start, void *end);
+extern int ftrace_nr_registered_ops(void);
+
/*
* The dyn_ftrace record's flags field is split into two parts.
* the first part which is '0-FTRACE_REF_MAX' is a counter of
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