3 files changed, 22 insertions, 9 deletions

diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index bc84106ac057..6e4fd28bc242 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -22,6 +22,7 @@
  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
+#include <linux/bcd.h>
 #include <linux/module.h>
 #include <linux/version.h>
 #include <linux/kernel.h>
@@ -123,9 +124,8 @@ static inline int is_root_hub(struct usb_device *udev)
  */
 
 /*-------------------------------------------------------------------------*/
-
-#define KERNEL_REL      ((LINUX_VERSION_CODE >> 16) & 0x0ff)
-#define KERNEL_VER      ((LINUX_VERSION_CODE >> 8) & 0x0ff)
+#define KERNEL_REL      bin2bcd(((LINUX_VERSION_CODE >> 16) & 0x0ff))
+#define KERNEL_VER      bin2bcd(((LINUX_VERSION_CODE >> 8) & 0x0ff))
 
 /* usb 3.0 root hub device descriptor */
 static const u8 usb3_rh_dev_descriptor[18] = {
diff --git a/include/linux/bcd.h b/include/linux/bcd.h
index 22ea563ba3eb..18fff11fb3ea 100644
--- a/include/linux/bcd.h
+++ b/include/linux/bcd.h
@@ -3,7 +3,20 @@
 
 #include <linux/compiler.h>
 
-unsigned bcd2bin(unsigned char val) __attribute_const__;
-unsigned char bin2bcd(unsigned val) __attribute_const__;
+#define bcd2bin(x)                                      \
+                (__builtin_constant_p((u8 )(x)) ?       \
+                const_bcd2bin(x) :                      \
+                _bcd2bin(x))
+
+#define bin2bcd(x)                                      \
+                (__builtin_constant_p((u8 )(x)) ?       \
+                const_bin2bcd(x) :                      \
+                _bin2bcd(x))
+
+#define const_bcd2bin(x)        (((x) & 0x0f) + ((x) >> 4) * 10)
+#define const_bin2bcd(x)        ((((x) / 10) << 4) + (x) % 10)
+
+unsigned _bcd2bin(unsigned char val) __attribute_const__;
+unsigned char _bin2bcd(unsigned val) __attribute_const__;
 
 #endif /* _BCD_H */
diff --git a/lib/bcd.c b/lib/bcd.c
index 55efaf742346..40d304efe272 100644
--- a/lib/bcd.c
+++ b/lib/bcd.c
@@ -1,14 +1,14 @@
 #include <linux/bcd.h>
 #include <linux/export.h>
 
-unsigned bcd2bin(unsigned char val)
+unsigned _bcd2bin(unsigned char val)
 {
         return (val & 0x0f) + (val >> 4) * 10;
 }
-EXPORT_SYMBOL(bcd2bin);
+EXPORT_SYMBOL(_bcd2bin);
 
-unsigned char bin2bcd(unsigned val)
+unsigned char _bin2bcd(unsigned val)
 {
         return ((val / 10) << 4) + val % 10;
 }
-EXPORT_SYMBOL(bin2bcd);
+EXPORT_SYMBOL(_bin2bcd);