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ftrace: fix hex output mode of ftrace 

Fix the output of ftrace in hex mode as the hi/lo nibbles are output in
reverse order. Without this patch, the output of ftrace is:

raw mode : 6474 0 141531612444 0 140 + 6402 120 S
hex mode : 000091a4 00000000 000000023f1f50c1 00000000 c8 000000b2 00009120 87 ffff00c8 00000035

There is an inversion on ouput hex(6474) is 194a

[based on a patch by Philippe Reynes <tremyfr@yahoo.fr>]
Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Harvey Harrison 2008-10-08 16:51:49 -07:00 committed by Ingo Molnar
parent ddc7a01aad
commit 2fbc474901
1 changed files with 2 additions and 6 deletions
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8
kernel/trace/trace.c
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@ -336,14 +336,12 @@ trace_seq_putmem(struct trace_seq *s, void *mem, size_t len)
} }
#define HEX_CHARS 17 #define HEX_CHARS 17
static const char hex2asc[] = "0123456789abcdef";
static int static int
trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len) trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len)
{ {
unsigned char hex[HEX_CHARS]; unsigned char hex[HEX_CHARS];
unsigned char *data = mem; unsigned char *data = mem;
unsigned char byte;
int i, j; int i, j;
BUG_ON(len >= HEX_CHARS); BUG_ON(len >= HEX_CHARS);
@ -353,10 +351,8 @@ trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len)
#else #else
for (i = len-1, j = 0; i >= 0; i--) { for (i = len-1, j = 0; i >= 0; i--) {
#endif #endif
byte = data[i]; hex[j++] = hex_asc_hi(data[i]);
hex[j++] = hex_asc_lo(data[i]);
hex[j++] = hex2asc[byte & 0x0f];
hex[j++] = hex2asc[byte >> 4];
} }
hex[j++] = ' '; hex[j++] = ' ';