[PATCH v4 3/4] tracepoint: Do not warn for unused event that is exported

[Steven Rostedt <rostedt@kernel.org>]

From: Steven Rostedt <rostedt@goodmis.org>

There are a few generic events that may only be used by modules. They are
defined and then set with EXPORT_TRACEPOINT*(). Mark events that are
exported as being used, even though they still waste memory in the kernel
proper.

Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
---
 include/linux/tracepoint.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h
index 2b96c7e94c52..8026a0659580 100644
--- a/include/linux/tracepoint.h
+++ b/include/linux/tracepoint.h
@@ -223,7 +223,8 @@ static inline struct tracepoint *tracepoint_ptr_deref(tracepoint_ptr_t *p)
 
 #ifdef CONFIG_TRACEPOINT_VERIFY_USED
 # define TRACEPOINT_CHECK(name)						\
-	static void __used __section("__tracepoint_check") *__trace_check = \
+	static void __used __section("__tracepoint_check") *		\
+	__trace_check_##name =						\
 		&__tracepoint_##name;
 #else
 # define TRACEPOINT_CHECK(name)
@@ -381,10 +382,12 @@ static inline struct tracepoint *tracepoint_ptr_deref(tracepoint_ptr_t *p)
 	__DEFINE_TRACE_EXT(_name, NULL, PARAMS(_proto), PARAMS(_args));
 
 #define EXPORT_TRACEPOINT_SYMBOL_GPL(name)				\
+	TRACEPOINT_CHECK(name)						\
 	EXPORT_SYMBOL_GPL(__tracepoint_##name);				\
 	EXPORT_SYMBOL_GPL(__traceiter_##name);				\
 	EXPORT_STATIC_CALL_GPL(tp_func_##name)
 #define EXPORT_TRACEPOINT_SYMBOL(name)					\
+	TRACEPOINT_CHECK(name)						\
 	EXPORT_SYMBOL(__tracepoint_##name);				\
 	EXPORT_SYMBOL(__traceiter_##name);				\
 	EXPORT_STATIC_CALL(tp_func_##name)
-- 
2.47.2