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 |
