I think this got broken by accident several years ago, shows how many
people use this feature :)

We used to use ->mss_clamp to determine the MSS option value,
but along the way when all of the code using ->advmss et al.
was added it didn't get translated correctly.

Thanks for your patch, I'll mull over this and put in the fix
once I understand exactly how this got broken.
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I am using, just i workaround this over iptables MSS option. You feel 
discomfort, but most people start googling and see this trick with iptables, 
and they use it.