| Error level value | Error level name | Meaning |
|---|---|---|
| 0 | KERN_EMERG | system is unusable |
| 1 | KERN_ALERT | action must be taken immediately |
| 2 | KERN_CRIT | critical conditions |
| 3 | KERN_ERR | error conditions |
| 4 | KERN_WARNING | warning conditions |
| 5 | KERN_NOTICE | normal but significant condition |
| 6 | KERN_INFO | informational |
| 7 | KERN_DEBUG | debug-level messages |
source:http://linuxpoison.blogspot.com/2010/08/135781677511877.html