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From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: Sat, 03 May 2008 09:27:55 +1000

> That is, it would be fairly non-sensical for module code to go through
> the trampoline to call those stubs in the kernel (and having to
> EXPORT_SYMBOL them).

Oh, I forgot about how far function calls are done on powerpc.
Yes, that will suck.

Is there some way to map all of the modules in the low 32-bits and
thus aovid the trampolines?  The powerpc call instruction can cover
4GB like on sparc right?

Actually, I remember there is some linkage register that has
to be setup on powerpc with the code model you guys use, is
that the problem?