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From: Rui Salvaterra <rsalvaterra@gmail.com>
Date: Mon, 25 Mar 2019 08:54:59 +0000
Message-ID: <CALjTZvZ8W9x1dxYvOFL8JqxYtiY+a05ihJkOiEjPUjDx-Gz2KA@mail.gmail.com>
Subject: Re: powerpc/mm: Only define MAX_PHYSMEM_BITS in SPARSEMEM
 configurations
To: ben@decadent.org.uk
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Hi, Ben

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

I just noticed these build warnings too. FWIW, I've been using
CONFIG_FLATMEM on my Power Mac G5 for about three years, so I guess
the answer is "yes" (for this specific machine, at least).