SCX_ENQ_HEAD
if (enq_flags & (SCX_ENQ_HEAD | SCX_ENQ_PREEMPT)) {
if (enq_flags & (SCX_ENQ_HEAD | SCX_ENQ_PREEMPT))
dispatch_enqueue(sch, rq, &rq->scx.local_dsq, p, SCX_ENQ_HEAD);
SCX_ENUM_SET(skel, scx_enq_flags, SCX_ENQ_HEAD); \