[PATCH] tracing: Fix to use unused attribute

[Li Zefan <lizf@cn.fujitsu.com>]

____ftrace_check_##name() is used for compile-time check
on F_printk() only, so it should be marked as __unused
instead of __used.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
---

I'm thinking about introducing __always_unused, comparing
to __maybe_unused.

---
 kernel/trace/trace_export.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/kernel/trace/trace_export.c b/kernel/trace/trace_export.c
index 934d81f..85309fc 100644
--- a/kernel/trace/trace_export.c
+++ b/kernel/trace/trace_export.c
@@ -48,11 +48,12 @@
 struct ____ftrace_##name {					\
 	tstruct							\
 };								\
-static void __used ____ftrace_check_##name(void)		\
+static void __attribute__((unused))				\
+____ftrace_check_##name(void)					\
 {								\
 	struct ____ftrace_##name *__entry = NULL;		\
 								\
-	/* force cmpile-time check on F_printk() */		\
+	/* force compile-time check on F_printk() */		\
 	printk(print);						\
 }
 
-- 
1.6.3