lib: create common ascii hex array

Add a common hex array in hexdump.c so everyone can use it.

Add a common hi/lo helper to avoid the shifting masking that is
done to get the upper and lower nibbles of a byte value.

Pull the pack_hex_byte helper from kgdb as it is opencoded many
places in the tree that will be consolidated.

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Acked-by: Paul Mundt <lethal@linux-sh.org>
Cc: Jason Wessel <jason.wessel@windriver.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

5 files changed, 20 insertions, 23 deletions

diff --git a/arch/sh/kernel/kgdb_stub.c b/arch/sh/kernel/kgdb_stub.c
index d453c3a1c79f..832641bbd47d 100644
--- a/arch/sh/kernel/kgdb_stub.c
+++ b/arch/sh/kernel/kgdb_stub.c
@@ -330,14 +330,6 @@ static char *ebin_to_mem(const char *buf, char *mem, int count)
         return mem;
 }
 
-/* Pack a hex byte */
-static char *pack_hex_byte(char *pkt, int byte)
-{
-        *pkt++ = hexchars[(byte >> 4) & 0xf];
-        *pkt++ = hexchars[(byte & 0xf)];
-        return pkt;
-}
-
 /* Scan for the start char '$', read the packet and check the checksum */
 static void get_packet(char *buffer, int buflen)
 {
diff --git a/drivers/pnp/support.c b/drivers/pnp/support.c
index 3eba85ed729c..95b076c18c07 100644
--- a/drivers/pnp/support.c
+++ b/drivers/pnp/support.c
@@ -45,10 +45,10 @@ void pnp_eisa_id_to_string(u32 id, char *str)
         str[0] = 'A' + ((id >> 26) & 0x3f) - 1;
         str[1] = 'A' + ((id >> 21) & 0x1f) - 1;
         str[2] = 'A' + ((id >> 16) & 0x1f) - 1;
-        str[3] = hex_asc((id >> 12) & 0xf);
-        str[4] = hex_asc((id >>  8) & 0xf);
-        str[5] = hex_asc((id >>  4) & 0xf);
-        str[6] = hex_asc((id >>  0) & 0xf);
+        str[3] = hex_asc_hi(id >> 8);
+        str[4] = hex_asc_lo(id >> 8);
+        str[5] = hex_asc_hi(id);
+        str[6] = hex_asc_lo(id);
         str[7] = '\0';
 }
 
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)
diff --git a/kernel/kgdb.c b/kernel/kgdb.c
index 39e31a036f5b..14787de568b3 100644
--- a/kernel/kgdb.c
+++ b/kernel/kgdb.c
@@ -346,14 +346,6 @@ static void put_packet(char *buffer)
         }
 }
 
-static char *pack_hex_byte(char *pkt, u8 byte)
-{
-        *pkt++ = hexchars[byte >> 4];
-        *pkt++ = hexchars[byte & 0xf];
-
-        return pkt;
-}
-
 /*
  * Convert the memory pointed to by mem into hex, placing result in buf.
  * Return a pointer to the last char put in buf (null). May return an error.
diff --git a/lib/hexdump.c b/lib/hexdump.c
index 343546550dc9..f07c0db81d26 100644
--- a/lib/hexdump.c
+++ b/lib/hexdump.c
@@ -12,6 +12,9 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 
+const char hex_asc[] = "0123456789abcdef";
+EXPORT_SYMBOL(hex_asc);
+
 /**
  * hex_dump_to_buffer - convert a blob of data to "hex ASCII" in memory
  * @buf: data blob to dump
@@ -93,8 +96,8 @@ void hex_dump_to_buffer(const void *buf, size_t len, int rowsize,
                 for (j = 0; (j < rowsize) && (j < len) && (lx + 4) < linebuflen;
                      j++) {
                         ch = ptr[j];
-                        linebuf[lx++] = hex_asc(ch >> 4);
-                        linebuf[lx++] = hex_asc(ch & 0x0f);
+                        linebuf[lx++] = hex_asc_hi(ch);
+                        linebuf[lx++] = hex_asc_lo(ch);
                         linebuf[lx++] = ' ';
                 }
                 ascii_column = 3 * rowsize + 2;