problem init_mm undefined on arm

[Oscar Salvador]

Hi!

While testing a module on arm platforms, I got an error which disturbed me.

In my module I'm using pgd_offset_k [
http://lxr.free-electrons.com/source/arch/x86/include/asm/pgtable.h#L720],
and this macro is  working for x86 and x86_64.

For arm platforms this macro is also defined here:
http://lxr.free-electrons.com/source/arch/arm/include/asm/pgtable.h#L182

but I get this error while compiling the module on arm board:

WARNING: "init_mm" [module] undefined!

init_mm is first defined in
http://lxr.free-electrons.com/source/mm/init-mm.c#L16
and then "exported" in
http://lxr.free-electrons.com/source/include/linux/sched.h#L2558

(I'm including this header)

Anyone knows how could I use pgd_offset_k in my module running on arm?

Thank you very much
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