[tproxy] Undefined symbols in patch for 2.6.14 kernel

Hi, I was trying to use the latest version of tproxy with the Linux kernel 2.6.14 After compilation when I try to load ip_nat module i got undefined symbols in the dmesg log: READ_LOCK READ_UNLOCK I assume the READ_LOCK can be replaced by ASSERT_READ_LOCK but could not find any similar UNLOCK defines.. Please advise. Cheers