RE: x86_64: potential critical issue with quicklists and page table pages

> The quicklists have a long history and this bug has therefore also been in 
> IA64 for a long time and it also likely exists on sparc64, sh and sh64. We 
> need the patch that I posted to fix the other platforms. And with this fix 
> there would be nothing amiss on x86_64 either.

IA64 doesn't do a pgd>pud>pmd>pte table walk in h/w.  The VHPT leaps
straight to the pte page (through the virtual mapping of the VHPT). So
this wasn't a problem for IA64.

-Tony
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