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    SubjectRe: [patch 3/3] mm: fault handler to replace nopage and populate
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    > The truncate logic can't be duplicated because it works on struct pages.
    >
    > What sounds best, if you use nopfn, is to do your own internal
    > synchronisation against your unmap call. Obviously you can't because you
    > have no ->nopfn_done call with which to drop locks ;)
    >
    > So, hmm yes I have a good idea for how fault() could take over ->nopfn as
    > well: just return NULL, set the fault type to VM_FAULT_MINOR, and have
    > the ->fault handler install the pte. It will require a new helper along
    > the lines of vm_insert_page.
    >
    > I'll code that up in my next patchset.

    Which is exactly what I was proposing in my other mail :)

    Read it, you'll understnad my point about the truncate logic... I
    sometimes want to return struct page (when the mapping is pointing to
    backup memory) or map it directly to hardware.

    In the later case, with an appropriate helper, I can definitely do my
    own locking. In the former case, I return struct page's and need the
    truncate logic.

    Ben.


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