1 files changed, 11 insertions, 1 deletions

diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 4d46e299afb5..792bf0aa779b 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -276,7 +276,17 @@ extern void print_hex_dump(const char *level, const char *prefix_str,
                                 const void *buf, size_t len, bool ascii);
 extern void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
                         const void *buf, size_t len);
-#define hex_asc(x)      "0123456789abcdef"[x]
+
+extern const char hex_asc[];
+#define hex_asc_lo(x)   hex_asc[((x) & 0x0f)]
+#define hex_asc_hi(x)   hex_asc[((x) & 0xf0) >> 4]
+
+static inline char *pack_hex_byte(char *buf, u8 byte)
+{
+        *buf++ = hex_asc_hi(byte);
+        *buf++ = hex_asc_lo(byte);
+        return buf;
+}
 
 #define pr_emerg(fmt, arg...) \
         printk(KERN_EMERG fmt, ##arg)