printk - Log Levels

The log levels are:

Name	String	Meaning	alias function
KERN_EMERG	"0"	Emergency messages, system is about to crash or is unstable	pr_emerg
KERN_ALERT	"1"	Something bad happened and action must be taken immediately	pr_alert
KERN_CRIT	"2"	A critical condition occurred like a serious hardware/software failure	pr_crit
KERN_ERR	"3"	An error condition, often used by drivers to indicate difficulties with the hardware	pr_err
KERN_WARNING	"4"	A warning, meaning nothing serious by itself but might indicate problems	pr_warning
KERN_NOTICE	"5"	Nothing serious, but notably nevertheless. Often used to report security events.	pr_notice
KERN_INFO	"6"	Informational message e.g. startup information at driver initialization	pr_info
KERN_DEBUG	"7"	Debug messages	pr_debug, pr_devel if DEBUG is defined
KERN_DEFAULT	"d"	The default kernel loglevel
KERN_CONT	""	"continued" line of log printout (only done after a line that had no enclosing \n) [1]	pr_cont