1 #ifndef _LINUX_FTRACE_H
2 #define _LINUX_FTRACE_H
6 #include <linux/linkage.h>
8 #define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
9 #define CALLER_ADDR1 ((unsigned long)__builtin_return_address(1))
10 #define CALLER_ADDR2 ((unsigned long)__builtin_return_address(2))
12 typedef void (*ftrace_func_t)(unsigned long ip, unsigned long parent_ip);
16 struct ftrace_ops *next;
20 * The ftrace_ops must be a static and should also
21 * be read_mostly. These functions do modify read_mostly variables
22 * so use them sparely. Never free an ftrace_op or modify the
23 * next pointer after it has been registered. Even after unregistering
24 * it, the next pointer may still be used internally.
26 int register_ftrace_function(struct ftrace_ops *ops);
27 int unregister_ftrace_function(struct ftrace_ops *ops);
28 void clear_ftrace_function(void);
30 extern void ftrace_stub(unsigned long a0, unsigned long a1);
31 extern void mcount(void);
33 #else /* !CONFIG_FTRACE */
34 # define register_ftrace_function(ops) do { } while (0)
35 # define unregister_ftrace_function(ops) do { } while (0)
36 # define clear_ftrace_function(ops) do { } while (0)
37 #endif /* CONFIG_FTRACE */
38 #endif /* _LINUX_FTRACE_H */