Re: fix CONFIG_HIGHPTE

[Anton Blanchard]

> We're piling more and more crap in there to support these pte_chains.
> How much is too much?
> 
> Is it likely that large pages and/or shared pagetables would allow us to
> place pagetables and pte_chains in the direct-mapped region, avoid all
> this?

On ppc64 shared pagetables will require significant changes to the way
we handle the hardware hashtable. So add that to the "more and more crap
in there to support these pte_chains"

Will shared pagetables be a requirement or can we turn it on per arch?

Anton