reqid_cb_data_t
extern int crypto_pr_reqid(uintptr_t, reqid_data_t *, reqid_cb_data_t *);
reqid_cb_data_t *cbdata;
if ((wsp->walk_cbdata = mdb_zalloc(sizeof (reqid_cb_data_t),
crypto_pr_reqid(uintptr_t addr, reqid_data_t *data, reqid_cb_data_t *cbdata)
reqid_cb_data_t cbdata;
reqid_cb_data_t cbdata;