linux-kernel - Re: A question on printascii

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Date:	Thu, 19 Jul 2012 23:54:15 -0400
From:	Chris Ball <cjb@...top.org>
To:	Shashidhar Hiremath <shashidharh@...avyalabs.com>
Cc:	lkml <linux-kernel@...r.kernel.org>
Subject: Re: A question on printascii

Hi Shashidhar,

On Wed, Jul 18 2012, Shashidhar Hiremath wrote:
>   I want to use printascii to debug my serial driver. How do I enable
> it and use the feature.
>   Currently I have enabled in menuconfig and done an extern on the
> printascii api, this doesn't seem to work, So any hints for debugging
> serial drivers ?

Sounds like you want this patch, against linux-next:

diff --git a/kernel/printk.c b/kernel/printk.c
index 3991862..36abce8 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -45,6 +45,8 @@
 
 #include <asm/uaccess.h>
 
+extern void printascii(char *);
+
 #define CREATE_TRACE_POINTS
 #include <trace/events/printk.h>
 
@@ -1542,6 +1544,8 @@ asmlinkage int vprintk_emit(int facility, int level,
 	 */
 	text_len = vscnprintf(text, sizeof(textbuf), fmt, args);
 
+	printascii(text);
+
 	/* mark and strip a trailing newline */
 	if (text_len && text[text_len-1] == '\n') {
 		text_len--;

-- 
Chris Ball   <cjb@...top.org>   <http://printf.net/>
One Laptop Per Child
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