[PATCH v2 rebased 5/9] powerpc/mm: Call radix__arch_get_unmapped_area() from arch_get_unmapped_area()

[Nicholas Piggin]

Excerpts from Christophe Leroy's message of November 26, 2021 3:52 am:
> Instead of setting mm->get_unmapped_area() to either
> arch_get_unmapped_area() or radix__arch_get_unmapped_area(),
> always set it to arch_get_unmapped_area() and call
> radix__arch_get_unmapped_area() from there when radix is enabled.
> 
> To keep radix__arch_get_unmapped_area() static, move it to slice.c
> 
> Do the same with radix__arch_get_unmapped_area_topdown()

Same comment with this one really. It would be better if we can
reuse generic code.

Thanks,
Nick