rwl_entry
rwl_entry(rwlp)->rd_count++;
readlockp = rwl_entry(rwlp);
rwl_entry(rwlp)->rd_count = 0;
rwl_entry(rwlp)->rd_count = 0;
readlockp = rwl_entry(rwlp);
rwl_entry(rwlp)->rd_count++;
readlockp = rwl_entry(rwlp);