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    SubjectRe: [PATCHSET] block: fix PIO cache coherency bug, take 2
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    > > > I tried to implement flush_anon_page() too but didn't know what to
    > > do
    > > > with anon_vma object.
    > >
    > > I'm not sure what this is about...
    >
    > This was for fuse on parisc.

    I have reports that this effects some ARM architectures as well.

    And direct I/O over NFS and a couple other things which also use the
    get_user_pages() mechanism will also not work properly without
    flush_anon_page().

    Miklos
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