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Define new MAP_SYNC flag and corresponding VMA VM_SYNC flag. As the MAP_SYNC flag is not part of LEGACY_MAP_MASK, currently it will be refused by all MAP_SHARED_VALIDATE map attempts and silently ignored for everything else. Reviewed-by: Ross Zwisler <[email protected]> Reviewed-by: Christoph Hellwig <[email protected]> Signed-off-by: Jan Kara <[email protected]> Signed-off-by: Dan Williams <[email protected]>