ftrace: simplify hexprint

simplify hex to ascii conversion.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 5 insertions, 18 deletions

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 4723e012151d..627e39936ea7 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -248,19 +248,18 @@ trace_seq_putmem(struct trace_seq *s, void *mem, size_t len)
 }
 
 #define HEX_CHARS 17
+static const char hex2asc[] = "0123456789abcdef";
 
 static int
 trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len)
 {
         unsigned char hex[HEX_CHARS];
-        unsigned char *data;
+        unsigned char *data = mem;
         unsigned char byte;
         int i, j;
 
         BUG_ON(len >= HEX_CHARS);
 
-        data = mem;
-
 #ifdef __BIG_ENDIAN
         for (i = 0, j = 0; i < len; i++) {
 #else
@@ -268,22 +267,10 @@ trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len)
 #endif
                 byte = data[i];
 
-                hex[j]   = byte & 0x0f;
-                if (hex[j] >= 10)
-                        hex[j] += 'a' - 10;
-                else
-                        hex[j] += '0';
-                j++;
-
-                hex[j] = byte >> 4;
-                if (hex[j] >= 10)
-                        hex[j] += 'a' - 10;
-                else
-                        hex[j] += '0';
-                j++;
+                hex[j++] = hex2asc[byte & 0x0f];
+                hex[j++] = hex2asc[byte >> 4];
         }
-        hex[j] = ' ';
-        j++;
+        hex[j++] = ' ';
 
         return trace_seq_putmem(s, hex, j);
 }