MBOX_WB_STATUS_MASK
(((wb) & MBOX_WB_STATUS_MASK) != MBOX_WB_STATUS_NOT_FINISHED)
(((wb) & MBOX_WB_STATUS_MASK) == MBOX_WB_STATUS_FINISHED_SUCCESS)
((FIELD_PREP(MBOX_WB_STATUS_MASK, (wb))) != MBOX_WB_STATUS_NOT_FINISHED)
((FIELD_PREP(MBOX_WB_STATUS_MASK, (wb))) == \