1 files changed, 7 insertions, 2 deletions

diff --git a/include/linux/bcd.h b/include/linux/bcd.h
index c545308125b..7ac518e3c15 100644
--- a/include/linux/bcd.h
+++ b/include/linux/bcd.h
@@ -10,8 +10,13 @@
 #ifndef _BCD_H
 #define _BCD_H
 
-#define BCD2BIN(val)    (((val) & 0x0f) + ((val)>>4)*10)
-#define BIN2BCD(val)    ((((val)/10)<<4) + (val)%10)
+#include <linux/compiler.h>
+
+unsigned bcd2bin(unsigned char val) __attribute_const__;
+unsigned char bin2bcd(unsigned val) __attribute_const__;
+
+#define BCD2BIN(val)    bcd2bin(val)
+#define BIN2BCD(val)    bin2bcd(val)
 
 /* backwards compat */
 #define BCD_TO_BIN(val) ((val)=BCD2BIN(val))