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RTH's final complaint (so far 8) was that we should sort the module
sections: archs might require some sections to be adjacent, so they can
all be reached by a relative pointer (ie. GOT pointer). This
implements that reordering, and simplfies the module interface for
architectures as well.
Previously an arch could specify it wanted extra space, but not where
that space would be. The new method (used only by PPC so far) is to
allocate an empty section (in asm/module.h or by setting LDFLAGS_MODULE
to use an arch specific linker script), and expand that to the desired
size in "module_frob_arch_sections()".
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Sparc64 (and probably others) need all the kernel symbols within
32-bits, which includes the manufactured "__this_module" which refers
to the struct module *.
This changes the interface back to its old style: the arch-specific code
manipulates the init and core sizes, and we call module_alloc() ourselves.
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Separates the module loading function prototypes (and elf.h) into
moduleloader.h. AT_GID in elf.h clashes with xfs.h, but this also
makes module.h less cluttered.
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