PSLIST_WRITER_INSERT_BEFORE
PSLIST_WRITER_INSERT_BEFORE(pport0, pport, lpp_entry);
PSLIST_WRITER_INSERT_BEFORE((sav), (new), pslist_entry)
PSLIST_WRITER_INSERT_BEFORE(&elements[4], &elements[2], entry);
PSLIST_WRITER_INSERT_BEFORE(&elements[4], &elements[3], entry);
PSLIST_WRITER_INSERT_BEFORE(&elements[2], &elements[1], entry);