tracing: Remove orphaned function ftrace_nr_registered_ops()

Remove ftrace_nr_registered_ops() because it is no longer used.

ftrace_nr_registered_ops() has been introduced by commit ea701f11da44
("ftrace: Add selftest to test function trace recursion protection"), but
its caller has been removed by commit 05cbbf643b8e ("tracing: Fix selftest
function recursion accounting"). So it is not called anymore.

Link: http://lkml.kernel.org/r/153260907227.12474.5234899025934963683.stgit@devbox

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

include/linux/ftrace.h

@@ -234,10 +234,6 @@ 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 ftrace_kill(void) { }
 static inline void ftrace_free_init_mem(void) { }
 static inline void ftrace_free_mem(struct module *mod, void *start, void *end) { }
@@ -328,8 +324,6 @@ struct seq_file;
 
 extern int ftrace_text_reserved(const void *start, const void *end);
 
-extern int ftrace_nr_registered_ops(void);
-
 struct ftrace_ops *ftrace_ops_trampoline(unsigned long addr);
 
 bool is_ftrace_trampoline(unsigned long addr);

kernel/trace/ftrace.c

@@ -157,30 +157,6 @@ static inline void ftrace_ops_init(struct ftrace_ops *ops)
 #endif
 }
 
-/**
- * ftrace_nr_registered_ops - return number of ops registered
- *
- * Returns the number of ftrace_ops registered and tracing functions
- */
-int ftrace_nr_registered_ops(void)
-{
-	struct ftrace_ops *ops;
-	int cnt = 0;
-
-	mutex_lock(&ftrace_lock);
-
-	for (ops = rcu_dereference_protected(ftrace_ops_list,
-					     lockdep_is_held(&ftrace_lock));
-	     ops != &ftrace_list_end;
-	     ops = rcu_dereference_protected(ops->next,
-					     lockdep_is_held(&ftrace_lock)))
-		cnt++;
-
-	mutex_unlock(&ftrace_lock);
-
-	return cnt;
-}
-
 static void ftrace_pid_func(unsigned long ip, unsigned long parent_ip,
 			    struct ftrace_ops *op, struct pt_regs *regs)
 {