linux-kernel - Re: [patch] clean hex output of ftrace

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Date:	Wed, 08 Oct 2008 16:51:49 -0700
From:	Harvey Harrison <harvey.harrison@...il.com>
To:	Joe Perches <joe@...ches.com>
Cc:	trem <tremyfr@...oo.fr>, linux-kernel@...r.kernel.org,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [patch] clean hex output of ftrace

On Wed, 2008-10-08 at 15:22 -0700, Joe Perches wrote:
> I'm surprised Harvey Harrison hasn't changed it to pack_hex_byte
> and removed the static.
> 

From: Harvey Harrison <harvey.harrison@...il.com>
Subject: [PATCH] ftrace: Fix inversion of hex output and use common routines

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@...oo.fr>]
Signed-off-by: Harvey Harrison <harvey.harrison@...il.com>
---
 kernel/trace/trace.c |    8 ++------
 1 files changed, 2 insertions(+), 6 deletions(-)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 8f3fb3d..763f763 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -396,14 +396,12 @@ 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 = mem;
-	unsigned char byte;
 	int i, j;
 
 	BUG_ON(len >= HEX_CHARS);
@@ -413,10 +411,8 @@ trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len)
 #else
 	for (i = len-1, j = 0; i >= 0; i--) {
 #endif
-		byte = data[i];
-
-		hex[j++] = hex2asc[byte & 0x0f];
-		hex[j++] = hex2asc[byte >> 4];
+		hex[j++] = hex_asc_hi(data[i]);
+		hex[j++] = hex_asc_lo(data[i]);
 	}
 	hex[j++] = ' ';
 
-- 
1.6.0.2.471.g47a76



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