| 1 | #ifndef _LTT_WRAPPER_FTRACE_H |
| 2 | #define _LTT_WRAPPER_FTRACE_H |
| 3 | |
| 4 | /* |
| 5 | * Copyright (C) 2011 Mathieu Desnoyers (mathieu.desnoyers@efficios.com) |
| 6 | * |
| 7 | * wrapper around vmalloc_sync_all. Using KALLSYMS to get its address when |
| 8 | * available, else we need to have a kernel that exports this function to GPL |
| 9 | * modules. |
| 10 | * |
| 11 | * Dual LGPL v2.1/GPL v2 license. |
| 12 | */ |
| 13 | |
| 14 | #include <linux/ftrace.h> |
| 15 | |
| 16 | #ifdef CONFIG_KALLSYMS |
| 17 | |
| 18 | #include <linux/kallsyms.h> |
| 19 | |
| 20 | static inline |
| 21 | int wrapper_register_ftrace_function_probe(char *glob, |
| 22 | struct ftrace_probe_ops *ops, void *data) |
| 23 | { |
| 24 | int (*register_ftrace_function_probe_sym)(char *glob, |
| 25 | struct ftrace_probe_ops *ops, void *data); |
| 26 | |
| 27 | register_ftrace_function_probe_sym = (void *) kallsyms_lookup_name("register_ftrace_function_probe"); |
| 28 | if (register_ftrace_function_probe_sym) { |
| 29 | return register_ftrace_function_probe_sym(glob, ops, data); |
| 30 | } else { |
| 31 | printk(KERN_WARNING "LTTng: register_ftrace_function_probe symbol lookup failed.\n"); |
| 32 | return -EINVAL; |
| 33 | } |
| 34 | } |
| 35 | |
| 36 | static inline |
| 37 | void wrapper_unregister_ftrace_function_probe(char *glob, |
| 38 | struct ftrace_probe_ops *ops, void *data) |
| 39 | { |
| 40 | void (*unregister_ftrace_function_probe_sym)(char *glob, |
| 41 | struct ftrace_probe_ops *ops, void *data); |
| 42 | |
| 43 | unregister_ftrace_function_probe_sym = (void *) kallsyms_lookup_name("unregister_ftrace_function_probe"); |
| 44 | if (unregister_ftrace_function_probe_sym) { |
| 45 | unregister_ftrace_function_probe_sym(glob, ops, data); |
| 46 | } else { |
| 47 | printk(KERN_WARNING "LTTng: unregister_ftrace_function_probe symbol lookup failed.\n"); |
| 48 | WARN_ON(1); |
| 49 | } |
| 50 | } |
| 51 | |
| 52 | #else |
| 53 | |
| 54 | static inline |
| 55 | int wrapper_register_ftrace_function_probe(char *glob, |
| 56 | struct ftrace_probe_ops *ops, void *data) |
| 57 | { |
| 58 | return unregister_ftrace_function_probe(); |
| 59 | } |
| 60 | |
| 61 | static inline |
| 62 | void wrapper_unregister_ftrace_function_probe(char *glob, |
| 63 | struct ftrace_probe_ops *ops, void *data) |
| 64 | { |
| 65 | return unregister_ftrace_function_probe(); |
| 66 | } |
| 67 | #endif |
| 68 | |
| 69 | #endif /* _LTT_WRAPPER_FTRACE_H */ |