__ntfs_bswap_constant_16
# define bswap_16(x) __ntfs_bswap_constant_16(x)
#define __constant_be16_to_cpu(x) __ntfs_bswap_constant_16((u16)(x))
#define __constant_cpu_to_be16(x) __ntfs_bswap_constant_16((u16)(x))
#define __constant_le16_to_cpu(x) __ntfs_bswap_constant_16((u16)(x))
#define __constant_cpu_to_le16(x) __ntfs_bswap_constant_16((u16)(x))