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Almost all of the callers & implementors of migrate_pages() were already converted to use folios. compaction_alloc() & compaction_free() are trivial to convert a part of this patch and not worth splitting out. Link: https://lkml.kernel.org/r/20230513001101.276972-1-willy@infradead.org Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Reviewed-by: "Huang, Ying" <ying.huang@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>