Ah the source of my confusion is that the page_mapcount() function in Linux returns page._mapcount + 1, and as a result when dump_page() prints mapcount:0 page._mapcount is, in fact, -1 and that's why all my == 0 tests are failing good good
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Which would be fine if page_mapcount() didn't punt off to __page_mapcount() for compound pages and make everything more confusing
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