powerpc: Only define HAVE_ARCH_HUGETLB_UNMAPPED_AREA if PPC_MM_SLICES
If we don't have slices, we should be able to use the generic hugetlb_get_unmapped_area() code Signed-off-by: NBecky Bruce <beckyb@kernel.crashing.org> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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