From f6f975f74e57492d952ce03c4f410d16935a3161 Mon Sep 17 00:00:00 2001
From: Hauke Mehrtens <hauke@hauke-m.de>
Date: Fri, 2 Aug 2019 22:06:21 +0200
Subject: header: Add trace_##name##_enabled()

This adds the function trace_##name##_enabled to __DECLARE_TRACE() which
was added in commit 7c65bbc7dc ("tracing: Add
trace_<tracepoint>_enabled() function"). This is now used by ath10k.

__DECLARE_TRACE() got other changes wit kernel 3.16, so add two
different versions.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
---
 backport/backport-include/linux/tracepoint.h | 132 +++++++++++++++++++++++++++
 1 file changed, 132 insertions(+)

diff --git a/backport/backport-include/linux/tracepoint.h b/backport/backport-include/linux/tracepoint.h
index a695c6fc..6bb91ad3 100644
--- a/backport/backport-include/linux/tracepoint.h
+++ b/backport/backport-include/linux/tracepoint.h
@@ -7,4 +7,136 @@
 #define TRACE_DEFINE_ENUM(a)
 #endif
 
+#if LINUX_VERSION_IS_LESS(3,15,0)
+#ifdef TRACEPOINTS_ENABLED
+#undef __DECLARE_TRACE
+#define __DECLARE_TRACE(name, proto, args, cond, data_proto, data_args) \
+	extern struct tracepoint __tracepoint_##name;			\
+	static inline void trace_##name(proto)				\
+	{								\
+		if (static_key_false(&__tracepoint_##name.key))		\
+			__DO_TRACE(&__tracepoint_##name,		\
+				TP_PROTO(data_proto),			\
+				TP_ARGS(data_args),			\
+				TP_CONDITION(cond),,);			\
+	}								\
+	__DECLARE_TRACE_RCU(name, PARAMS(proto), PARAMS(args),		\
+		PARAMS(cond), PARAMS(data_proto), PARAMS(data_args))	\
+	static inline int						\
+	register_trace_##name(void (*probe)(data_proto), void *data)	\
+	{								\
+		return tracepoint_probe_register(#name, (void *)probe,	\
+						 data);			\
+	}								\
+	static inline int						\
+	unregister_trace_##name(void (*probe)(data_proto), void *data)	\
+	{								\
+		return tracepoint_probe_unregister(#name, (void *)probe, \
+						   data);		\
+	}								\
+	static inline void						\
+	check_trace_callback_type_##name(void (*cb)(data_proto))	\
+	{								\
+	}								\
+	static inline bool						\
+	trace_##name##_enabled(void)					\
+	{								\
+		return static_key_false(&__tracepoint_##name.key);	\
+	}
+
+#else
+#undef __DECLARE_TRACE
+#define __DECLARE_TRACE(name, proto, args, cond, data_proto, data_args) \
+	static inline void trace_##name(proto)				\
+	{ }								\
+	static inline void trace_##name##_rcuidle(proto)		\
+	{ }								\
+	static inline int						\
+	register_trace_##name(void (*probe)(data_proto),		\
+			      void *data)				\
+	{								\
+		return -ENOSYS;						\
+	}								\
+	static inline int						\
+	unregister_trace_##name(void (*probe)(data_proto),		\
+				void *data)				\
+	{								\
+		return -ENOSYS;						\
+	}								\
+	static inline void check_trace_callback_type_##name(void (*cb)(data_proto)) \
+	{								\
+	}								\
+	static inline bool						\
+	trace_##name##_enabled(void)					\
+	{								\
+		return false;						\
+	}
+#endif /* TRACEPOINTS_ENABLED */
+#elif LINUX_VERSION_IS_LESS(3,16,0)
+#ifdef TRACEPOINTS_ENABLED
+#undef __DECLARE_TRACE
+#define __DECLARE_TRACE(name, proto, args, cond, data_proto, data_args) \
+	extern struct tracepoint __tracepoint_##name;			\
+	static inline void trace_##name(proto)				\
+	{								\
+		if (static_key_false(&__tracepoint_##name.key))		\
+			__DO_TRACE(&__tracepoint_##name,		\
+				TP_PROTO(data_proto),			\
+				TP_ARGS(data_args),			\
+				TP_CONDITION(cond),,);			\
+	}								\
+	__DECLARE_TRACE_RCU(name, PARAMS(proto), PARAMS(args),		\
+		PARAMS(cond), PARAMS(data_proto), PARAMS(data_args))	\
+	static inline int						\
+	register_trace_##name(void (*probe)(data_proto), void *data)	\
+	{								\
+		return tracepoint_probe_register(&__tracepoint_##name,	\
+						(void *)probe, data);	\
+	}								\
+	static inline int						\
+	unregister_trace_##name(void (*probe)(data_proto), void *data)	\
+	{								\
+		return tracepoint_probe_unregister(&__tracepoint_##name,\
+						(void *)probe, data);	\
+	}								\
+	static inline void						\
+	check_trace_callback_type_##name(void (*cb)(data_proto))	\
+	{								\
+	}								\
+	static inline bool						\
+	trace_##name##_enabled(void)					\
+	{								\
+		return static_key_false(&__tracepoint_##name.key);	\
+	}
+
+#else
+#undef __DECLARE_TRACE
+#define __DECLARE_TRACE(name, proto, args, cond, data_proto, data_args) \
+	static inline void trace_##name(proto)				\
+	{ }								\
+	static inline void trace_##name##_rcuidle(proto)		\
+	{ }								\
+	static inline int						\
+	register_trace_##name(void (*probe)(data_proto),		\
+			      void *data)				\
+	{								\
+		return -ENOSYS;						\
+	}								\
+	static inline int						\
+	unregister_trace_##name(void (*probe)(data_proto),		\
+				void *data)				\
+	{								\
+		return -ENOSYS;						\
+	}								\
+	static inline void check_trace_callback_type_##name(void (*cb)(data_proto)) \
+	{								\
+	}								\
+	static inline bool						\
+	trace_##name##_enabled(void)					\
+	{								\
+		return false;						\
+	}
+#endif /* TRACEPOINTS_ENABLED */
+#endif /* < 3.16 */
+
 #endif /* __BACKPORT_LINUX_TRACEPOINT_H */
-- 
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