1 files changed, 2 insertions, 1 deletions

diff --git a/include/asm-powerpc/udbg.h b/include/asm-powerpc/udbg.h
index 5c4236c342bb..19a1517ac43b 100644
--- a/include/asm-powerpc/udbg.h
+++ b/include/asm-powerpc/udbg.h
@@ -23,7 +23,8 @@ extern int udbg_write(const char *s, int n);
 extern int udbg_read(char *buf, int buflen);
 
 extern void register_early_udbg_console(void);
-extern void udbg_printf(const char *fmt, ...);
+extern void udbg_printf(const char *fmt, ...)
+        __attribute__ ((format (printf, 1, 2)));
 extern void udbg_progress(char *s, unsigned short hex);
 
 extern void udbg_init_uart(void __iomem *comport, unsigned int speed,