Linux设备驱动第三版第三章：
There are eight possible loglevel strings, defined in the header ; we list them in order of decreasing severity:
KERN_EMERG
Used for emergency messages, usually those that precede a crash.
KERN_ALERT
A situation requiring immediate action.
KERN_CRIT
Critical conditions, often related to serious hardware or software failures.
KERN_ERR
Used to report error conditions; device drivers often use KERN_ERR to report hardware difficulties.
KERN_WARNING
Warnings about problematic situations that do not, in themselves, create serious
problems with the system.
KERN_NOTICE
Situations that are normal, but still worthy of note. A number of security-related
conditions are reported at this level.
KERN_INFO
Informational messages. Many drivers print information about the hardware
they find at startup time at this level.
KERN_DEBUG
Used for debugging messages.
Each string (in the macro expansion) represents an integer in angle brackets. Integers range from 0 to 7, with smaller values representing higher priorities.
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