I have been stuck by a basic coding question for two days, wish somebody can 
help me out...

in NetBSD, (or any other xBSD), KERNEL macro is scattered in many source 
codes, my question is what they're designed for, when i should #def it and 
when i should #undef it. I don't believe they're designed for in-kernel 
codes only, since many kernel code doesn't need this Macro to compile...

Shed me a light please.

Thanks in advance
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