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The folio equivalent of memcpy_page(). It should correctly and efficiently manage large folios: - If one, neither or both is highmem - If (either or both) offset+len crosses a page boundary - If the two offsets are congruent or not Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Reviewed-by: Chao Yu <chao@kernel.org> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>