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SubjectExtern variables in *.c files
I grepped kernel *.c (not *.h!) files for extern variable definitions.
Much to my surprize, I found ~1500 such defs.

Isn't that bad C code style? What will happen if/when type of variable gets
changed? (int->long).

I thought external definitions ought to be in *.h files.
Maybe I'm missing something here...
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