MPI2_HEADER_VERSION_UNIT_MASK  281 drivers/scsi/megaraid/megaraid_sas_fusion.h #define MPI2_HEADER_VERSION_UNIT_MASK       (0xFF00)
MPI2_HEADER_VERSION_UNIT_MASK  167 drivers/scsi/mpt3sas/mpi/mpi2.h #define MPI2_HEADER_VERSION_UNIT_MASK       (0xFF00)