CMDQ_PROD_OWNED_FLAG
CMDQ_PROD_OWNED_FLAG;
owner = !(llq.prod & CMDQ_PROD_OWNED_FLAG);
head.prod &= ~CMDQ_PROD_OWNED_FLAG;
llq.prod &= ~CMDQ_PROD_OWNED_FLAG;
prod = atomic_fetch_andnot_relaxed(CMDQ_PROD_OWNED_FLAG,
prod &= ~CMDQ_PROD_OWNED_FLAG;