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SubjectRe: fix CONFIG_HIGHPTE

> 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
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