> Other than the fact that the memmap must be PMD aligned to use hugepage
> entries for the memmap.
Why is that so? mem_map should be just part of lowmem anyways.
> It could be mapped with small pages in corner cases
> but the complexity worth it?
You don't need to map it with small pages in the normal case,
the only requirement is that c_p_a() is aware of it so it can
split it if needed.
> I can't see this type of lifting being done any time soon. As SPARSEMEM works
> and there is hope with the vmemmap work that DISCONTIG will finally go away,
> it may not be the best investment of time.
It's a trivial change, probably less code than your original patch.
-Andi
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