[PATCH] tracing: add printf attribute to log function

[trix]

From: Tom Rix <trix@xxxxxxxxxx>

Attributing the function allows the compiler to more thoroughly
check the use of the function with -Wformat and similar flags.

Signed-off-by: Tom Rix <trix@xxxxxxxxxx>
---
 include/linux/trace.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/linux/trace.h b/include/linux/trace.h
index 886a4ffd9d45..be1e130ed87c 100644
--- a/include/linux/trace.h
+++ b/include/linux/trace.h
@@ -34,8 +34,9 @@ int unregister_ftrace_export(struct trace_export *export);
 struct trace_array;
 
 void trace_printk_init_buffers(void);
+__printf(3, 4)
 int trace_array_printk(struct trace_array *tr, unsigned long ip,
-		const char *fmt, ...);
+		       const char *fmt, ...);
 int trace_array_init_printk(struct trace_array *tr);
 void trace_array_put(struct trace_array *tr);
 struct trace_array *trace_array_get_by_name(const char *name);
-- 
2.27.0