mm/migrate: Add folio_migrate_mapping()
Reimplement migrate_page_move_mapping() as a wrapper around folio_migrate_mapping(). Saves 193 bytes of kernel text. Signed-off-by: NMatthew Wilcox (Oracle) <willy@infradead.org> Reviewed-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NDavid Howells <dhowells@redhat.com> Acked-by: NVlastimil Babka <vbabka@suse.cz>
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