rsk_refcnt
refcount_set(&oreq->rsk_refcnt, 1);
DEBUG_NET_WARN_ON_ONCE(refcount_read(&req->rsk_refcnt) != 0);
if (refcount_dec_and_test(&req->rsk_refcnt))
refcount_set(&nreq->rsk_refcnt, 2 + 1);
refcount_set(&req->rsk_refcnt, 2 + 1);
refcount_set(&nreq->rsk_refcnt, 1);
refcount_set(&nreq->rsk_refcnt, 1);
refcount_set(&req->rsk_refcnt, 0);
refcount_set(&req->rsk_refcnt, 1);
refcount_set(&req->rsk_refcnt, 2);