> - if (PageHighMem(pfn_to_page(pfn))) {
> + if (PageHighMem(page) || xpfo_page_is_unmapped(page)) {
Please don't sprinkle xpfo details over various bits of code.
Just add a helper with a descriptive name, e.g.
page_is_unmapped()
that also includes the highmem case, as that will easily document
what this check is doing.
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