ILU_STALL_DEREGISTER
while (ilu->ilu_flags & ILU_STALL_DEREGISTER) {
ilu->ilu_flags |= ILU_STALL_DEREGISTER;
ilu->ilu_flags &= ~ILU_STALL_DEREGISTER;
ilu->ilu_flags |= ILU_STALL_DEREGISTER;
ilu->ilu_flags &= ~ILU_STALL_DEREGISTER;