mm/migrate: Use a folio in migrate_misplaced_transhuge_page()
Unify alloc_misplaced_dst_page() and alloc_misplaced_dst_page_thp(). Removes an assumption that compound pages are HPAGE_PMD_ORDER. Signed-off-by: NMatthew Wilcox (Oracle) <willy@infradead.org> Reviewed-by: NZi Yan <ziy@nvidia.com> Reviewed-by: NWilliam Kucharski <william.kucharski@oracle.com>
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