1 files changed, 29 insertions, 8 deletions

diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h
index a4a90b6726ce..c6814616653b 100644
--- a/include/linux/tracepoint.h
+++ b/include/linux/tracepoint.h
@@ -32,7 +32,7 @@ struct tracepoint {
         int state;                      /* State. */
         void (*regfunc)(void);
         void (*unregfunc)(void);
-        struct tracepoint_func *funcs;
+        struct tracepoint_func __rcu *funcs;
 } __attribute__((aligned(32)));         /*
                                          * Aligned on 32 bytes because it is
                                          * globally visible and gcc happily
@@ -106,6 +106,7 @@ static inline void tracepoint_update_probe_range(struct tracepoint *begin,
 
 #define TP_PROTO(args...)       args
 #define TP_ARGS(args...)        args
+#define TP_CONDITION(args...)   args
 
 #ifdef CONFIG_TRACEPOINTS
 
@@ -119,12 +120,14 @@ static inline void tracepoint_update_probe_range(struct tracepoint *begin,
  * as "(void *, void)". The DECLARE_TRACE_NOARGS() will pass in just
  * "void *data", where as the DECLARE_TRACE() will pass in "void *data, proto".
  */
-#define __DO_TRACE(tp, proto, args)                                     \
+#define __DO_TRACE(tp, proto, args, cond)                               \
         do {                                                            \
                 struct tracepoint_func *it_func_ptr;                    \
                 void *it_func;                                          \
                 void *__data;                                           \
                                                                         \
+                if (!(cond))                                            \
+                        return;                                         \
                 rcu_read_lock_sched_notrace();                          \
                 it_func_ptr = rcu_dereference_sched((tp)->funcs);       \
                 if (it_func_ptr) {                                      \
@@ -142,7 +145,7 @@ static inline void tracepoint_update_probe_range(struct tracepoint *begin,
  * not add unwanted padding between the beginning of the section and the
  * structure. Force alignment to the same alignment as the section start.
  */
-#define __DECLARE_TRACE(name, proto, args, data_proto, data_args)       \
+#define __DECLARE_TRACE(name, proto, args, cond, data_proto, data_args) \
         extern struct tracepoint __tracepoint_##name;                   \
         static inline void trace_##name(proto)                          \
         {                                                               \
@@ -151,7 +154,8 @@ static inline void tracepoint_update_probe_range(struct tracepoint *begin,
 do_trace:                                                               \
                         __DO_TRACE(&__tracepoint_##name,                \
                                 TP_PROTO(data_proto),                   \
-                                TP_ARGS(data_args));                    \
+                                TP_ARGS(data_args),                     \
+                                TP_CONDITION(cond));                    \
         }                                                               \
         static inline int                                               \
         register_trace_##name(void (*probe)(data_proto), void *data)    \
@@ -186,7 +190,7 @@ do_trace:								\
         EXPORT_SYMBOL(__tracepoint_##name)
 
 #else /* !CONFIG_TRACEPOINTS */
-#define __DECLARE_TRACE(name, proto, args, data_proto, data_args)       \
+#define __DECLARE_TRACE(name, proto, args, cond, data_proto, data_args) \
         static inline void trace_##name(proto)                          \
         { }                                                             \
         static inline int                                               \
@@ -227,13 +231,20 @@ do_trace:								\
  * "void *__data, proto" as the callback prototype.
  */
 #define DECLARE_TRACE_NOARGS(name)                                      \
-                __DECLARE_TRACE(name, void, , void *__data, __data)
+                __DECLARE_TRACE(name, void, , 1, void *__data, __data)
 
 #define DECLARE_TRACE(name, proto, args)                                \
-                __DECLARE_TRACE(name, PARAMS(proto), PARAMS(args),      \
+                __DECLARE_TRACE(name, PARAMS(proto), PARAMS(args), 1,   \
                                 PARAMS(void *__data, proto),            \
                                 PARAMS(__data, args))
 
+#define DECLARE_TRACE_CONDITION(name, proto, args, cond)                \
+        __DECLARE_TRACE(name, PARAMS(proto), PARAMS(args), PARAMS(cond), \
+                        PARAMS(void *__data, proto),                    \
+                        PARAMS(__data, args))
+
+#define TRACE_EVENT_FLAGS(event, flag)
+
 #endif /* DECLARE_TRACE */
 
 #ifndef TRACE_EVENT
@@ -315,7 +326,7 @@ do_trace:								\
  *              memcpy(__entry->prev_comm, prev->comm, TASK_COMM_LEN);
  *              __entry->next_pid       = next->pid;
  *              __entry->next_prio      = next->prio;
- *      )
+ *      ),
  *
  *      *
  *      * Formatted output of a trace record via TP_printk().
@@ -347,11 +358,21 @@ do_trace:								\
         DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
         DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
+#define DEFINE_EVENT_CONDITION(template, name, proto,           \
+                               args, cond)                      \
+        DECLARE_TRACE_CONDITION(name, PARAMS(proto),            \
+                                PARAMS(args), PARAMS(cond))
 
 #define TRACE_EVENT(name, proto, args, struct, assign, print)   \
         DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
 #define TRACE_EVENT_FN(name, proto, args, struct,               \
                 assign, print, reg, unreg)                      \
         DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
+#define TRACE_EVENT_CONDITION(name, proto, args, cond,          \
+                              struct, assign, print)            \
+        DECLARE_TRACE_CONDITION(name, PARAMS(proto),            \
+                                PARAMS(args), PARAMS(cond))
+
+#define TRACE_EVENT_FLAGS(event, flag)
 
 #endif /* ifdef TRACE_EVENT (see note above) */