OK, what about this:

I considered passing the the real setsockopt function as an argument
to what is now compat_mc_setsockopt() before putting the direct calls in.
By doing that, we can only get in there with a v6 setsockopt when v6 is
loaded, since the calls to it are from the corresponding 
compat_setsockopt.
Is that too ugly?

        Could also make these  return pointers to the new koptval and 
koptlen,
which is really the only thing we need outside the 
compat_ipXX_setsockopt()'s.

                                                +-DLS

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