tracing: Fix to use __always_unused attribute

____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>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
LKML-Reference: <4AEE2D01.4010305@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/kernel/trace/trace_export.c b/kernel/trace/trace_export.c
index 9753fcc..c74848d 100644 (file)
--- a/kernel/trace/trace_export.c
+++ b/kernel/trace/trace_export.c
@@ -48,11 +48,11 @@
 struct ____ftrace_##name {                                     \
        tstruct                                                 \
 };                                                             \
-static void __used ____ftrace_check_##name(void)               \
+static void __always_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);                                          \
 }