powerpc/mm: Only define MAX_PHYSMEM_BITS in SPARSEMEM configurations

[Andreas Schwab]

On Mär 24 2019, Ben Hutchings <ben at decadent.org.uk> wrote:

> Presumably you have CONFIG_PPC_BOOK3S_64 enabled and CONFIG_SPARSEMEM
> disabled?  Was this configuration actually usable?

Why not?

Andreas.

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Andreas Schwab, schwab at linux-m68k.org
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