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