1 files changed, 32 insertions, 7 deletions

diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h
index a5f7f3ecafa3..696a339c592c 100644
--- a/include/linux/tracepoint.h
+++ b/include/linux/tracepoint.h
@@ -26,6 +26,7 @@ struct notifier_block;
 struct tracepoint_func {
         void *func;
         void *data;
+        int prio;
 };
 
 struct tracepoint {
@@ -42,9 +43,14 @@ struct trace_enum_map {
         unsigned long           enum_value;
 };
 
+#define TRACEPOINT_DEFAULT_PRIO 10
+
 extern int
 tracepoint_probe_register(struct tracepoint *tp, void *probe, void *data);
 extern int
+tracepoint_probe_register_prio(struct tracepoint *tp, void *probe, void *data,
+                               int prio);
+extern int
 tracepoint_probe_unregister(struct tracepoint *tp, void *probe, void *data);
 extern void
 for_each_kernel_tracepoint(void (*fct)(struct tracepoint *tp, void *priv),
@@ -111,7 +117,18 @@ extern void syscall_unregfunc(void);
 #define TP_ARGS(args...)        args
 #define TP_CONDITION(args...)   args
 
-#ifdef CONFIG_TRACEPOINTS
+/*
+ * Individual subsystem my have a separate configuration to
+ * enable their tracepoints. By default, this file will create
+ * the tracepoints if CONFIG_TRACEPOINT is defined. If a subsystem
+ * wants to be able to disable its tracepoints from being created
+ * it can define NOTRACE before including the tracepoint headers.
+ */
+#if defined(CONFIG_TRACEPOINTS) && !defined(NOTRACE)
+#define TRACEPOINTS_ENABLED
+#endif
+
+#ifdef TRACEPOINTS_ENABLED
 
 /*
  * it_func[0] is never NULL because there is at least one element in the array
@@ -167,10 +184,11 @@ extern void syscall_unregfunc(void);
  * structure. Force alignment to the same alignment as the section start.
  *
  * When lockdep is enabled, we make sure to always do the RCU portions of
- * the tracepoint code, regardless of whether tracing is on or we match the
- * condition.  This lets us find RCU issues triggered with tracepoints even
- * when this tracepoint is off.  This code has no purpose other than poking
- * RCU a bit.
+ * the tracepoint code, regardless of whether tracing is on. However,
+ * don't check if the condition is false, due to interaction with idle
+ * instrumentation. This lets us find RCU issues triggered with tracepoints
+ * even when this tracepoint is off. This code has no purpose other than
+ * poking RCU a bit.
  */
 #define __DECLARE_TRACE(name, proto, args, cond, data_proto, data_args) \
         extern struct tracepoint __tracepoint_##name;                   \
@@ -196,6 +214,13 @@ extern void syscall_unregfunc(void);
                                                 (void *)probe, data);   \
         }                                                               \
         static inline int                                               \
+        register_trace_prio_##name(void (*probe)(data_proto), void *data,\
+                                   int prio)                            \
+        {                                                               \
+                return tracepoint_probe_register_prio(&__tracepoint_##name, \
+                                              (void *)probe, data, prio); \
+        }                                                               \
+        static inline int                                               \
         unregister_trace_##name(void (*probe)(data_proto), void *data)  \
         {                                                               \
                 return tracepoint_probe_unregister(&__tracepoint_##name,\
@@ -234,7 +259,7 @@ extern void syscall_unregfunc(void);
 #define EXPORT_TRACEPOINT_SYMBOL(name)                                  \
         EXPORT_SYMBOL(__tracepoint_##name)
 
-#else /* !CONFIG_TRACEPOINTS */
+#else /* !TRACEPOINTS_ENABLED */
 #define __DECLARE_TRACE(name, proto, args, cond, data_proto, data_args) \
         static inline void trace_##name(proto)                          \
         { }                                                             \
@@ -266,7 +291,7 @@ extern void syscall_unregfunc(void);
 #define EXPORT_TRACEPOINT_SYMBOL_GPL(name)
 #define EXPORT_TRACEPOINT_SYMBOL(name)
 
-#endif /* CONFIG_TRACEPOINTS */
+#endif /* TRACEPOINTS_ENABLED */
 
 #ifdef CONFIG_TRACING
 /**