MFC of r180753: ABI problems?

[Max Laier]

Hi,

I'm wondering how to merge r180753 to stable/7 as luoqi@ has indicated that he 
doesn't have time to take care of it right now.

It seems that changing the size of pcicfgregs (aka struct pcicfg) which is 
part of struct pci_devinfo is out of the question, right?  Ideas where to 
store the HT related state or how to avoid storing the state are welcome.

The merge result is attached for reference.  This fix is essential for many 
nforce based boards from ASUS which are rather common, I'm afraid.  So it 
would be good to have this in 7.1/6.4, I think.

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