linux-kernel - Re: A question on printascii

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Date:	Fri, 20 Jul 2012 13:50:55 +0530
From:	Shashidhar Hiremath <shashidharh@...avyalabs.com>
To:	Chris Ball <cjb@...top.org>
Cc:	lkml <linux-kernel@...r.kernel.org>
Subject: Re: A question on printascii

thanks a lot Chris. Will try it out.

On Fri, Jul 20, 2012 at 9:24 AM, Chris Ball <cjb@...top.org> wrote:
> 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



-- 
regards,
Shashidhar Hiremath
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