On Sat, Jul 11, 2015 at 11:06:30PM +1000, Orion Agali wrote:
> I'm using Arch and I cannot figure out how to get printk debug messages to
> display in journalctl.
>
> I tried the following:
> * Set LogLevel=debug in /etc/systemd/systemd.conf
> * Add kernel parameter 'debug' on boot
> * Setting loglevel=8 in /proc/sys/kernel/printk
> * dmsg -n 8
>
> Consider the following module:
>
> ----------
> #include <linux/module.h>
> #include <linux/kernel.h>
> #include <linux/init.h>
> static int __init task1_init(void)
> {
> pr_notice("I am at level notice");
> pr_debug("I am at level debug.");
> return 0;
> }
> static void __exit task1_exit(void){}
> module_init(task1_init);
> module_exit(task1_exit);
> ------------
>
> The notice level is printed but the debug level is not.
> The debug message is not in dmesg or /dev/kmsg either
>
> The answer is probably straight forward, but I've hit a wall so I'm hoping
> somebody here will be able to point me in the right direction
Take a look at Documentation/dynamic-debug-howto.txt for how to get
pr_debug() working properly for your module.
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