diff --git a/include/linux/hw_breakpoint.h b/include/linux/hw_breakpoint.h
index 42da1ce..69f07a9 100644
--- a/include/linux/hw_breakpoint.h
+++ b/include/linux/hw_breakpoint.h
@@ -55,7 +55,7 @@
 			    struct task_struct *tsk);
 
 /* FIXME: only change from the attr, and don't unregister */
-extern struct perf_event *
+extern int
 modify_user_hw_breakpoint(struct perf_event *bp, struct perf_event_attr *attr);
 
 /*
@@ -91,7 +91,7 @@
 register_user_hw_breakpoint(struct perf_event_attr *attr,
 			    perf_overflow_handler_t triggered,
 			    struct task_struct *tsk)	{ return NULL; }
-static inline struct perf_event *
+static inline int
 modify_user_hw_breakpoint(struct perf_event *bp,
 			  struct perf_event_attr *attr)	{ return NULL; }
 static inline struct perf_event *
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index bf33294..64a53f7 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -872,6 +872,8 @@
 			     const void *buf, unsigned int len);
 extern int perf_swevent_get_recursion_context(void);
 extern void perf_swevent_put_recursion_context(int rctx);
+extern void perf_event_enable(struct perf_event *event);
+extern void perf_event_disable(struct perf_event *event);
 #else
 static inline void
 perf_event_task_sched_in(struct task_struct *task, int cpu)		{ }
@@ -902,7 +904,8 @@
 static inline void perf_event_init(void)				{ }
 static inline int  perf_swevent_get_recursion_context(void)  { return -1; }
 static inline void perf_swevent_put_recursion_context(int rctx)		{ }
-
+static inline void perf_event_enable(struct perf_event *event)		{ }
+static inline void perf_event_disable(struct perf_event *event)		{ }
 #endif
 
 #define perf_output_put(handle, x) \