This looks fine.
> + Alternatively, it could be the struct page * index inside
> + mem_map.
But I'd just omit this last sentence ... that only works for machines
with a contig mem_map (not NUMA), and it's kind of an accidental
kludge that happens to work in some cases, not the proper definition
(what I originally posted was confusing).
I actually submitted a patch a couple of days ago to fix these to
a pfn instead. If that gets in, we can update the documentation then.
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