refcount_acquire
refcount_acquire(&reap->refs);
refcount_acquire(&p2->p_args->ar_ref);
refcount_acquire(&p2->p_sigacts->ps_refcnt);
refcount_acquire(&pa->ar_ref);
refcount_acquire(&pgrp->pg_refs);
refcount_acquire(&pgrp->pg_refs);
refcount_acquire(&sf->ref);
refcount_acquire(&na->na_refcount);
refcount_acquire(&l->l_refcnt);
refcount_acquire(&r->r_refcnt);
refcount_acquire(&kp->kp_refcnt);
refcount_acquire(&item->refs);
refcount_acquire(&pmobj->hold_count);
refcount_acquire(&pmobj->hold_count);
refcount_acquire(&sg->sg_refs);
refcount_acquire(&ar->ar_refcount);
refcount_acquire(&fmp->refcnt);
refcount_acquire(&obj->hold_count);
refcount_acquire(&obj->hold_count);
refcount_acquire(&obj->hold_count);