How to use pr_debug

[Kim Chan]

Yes, if you add a line below,
console_loglevel = 8;  // 8 is debug level
The debug messages will also be printed to your console (serial port).
(Maybe this also goes to /var/log/debug ?)
you could revert it back after use.

Chan


________________________________
From : "Valdis.Kletnieks at vt.edu" <Valdis.Kletnieks at vt.edu>
Sent : 2014-02-27 07:31:25 ( +09:00 )
To : m silverstri <michael.j.silverstri at gmail.com>
Cc : kernelnewbies <kernelnewbies at kernelnewbies.org>
Subject : Re: How to use pr_debug

On Wed, 26 Feb 2014 11:35:23 -0800, m silverstri said:
> I am using 'pr_debug()' to print debug statements. But I don't see
> anything in my serial console. But when I use pr_info(), I see the
> debug statements.
> Do I need to do anything to see pr_debug()?

You probably need a #define DEBUG. Also, check your console logging
level, make sure it's set to output debug-level to the console.

/proc/sys/kernel/printk and 'dmesg --console-level' are your friends.
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