SCX_CALL_OP_2TASKS_RET
SCX_CALL_OP_2TASKS_RET(sch, yield, rq, p, NULL);
return SCX_CALL_OP_2TASKS_RET(sch, yield, rq, from, to);
return SCX_CALL_OP_2TASKS_RET(sch_a, core_sched_before,