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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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