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    SubjectRe: [patch 4/6] mm: merge populate and nopage into fault (fixes nonlinear)
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    > > 
    > > Look in page_mkclean(). Where does it handle non-linear mappings?
    > >
    >
    > OK, I'd forgotten about that. It won't break dirty memory accounting,
    > but it'll potentially break dirty memory balancing.
    >
    > If we have the wrong page (due to nonlinear), page_check_address() will
    > fail and we'll leave the pte dirty.

    It won't even get that far, because it only looks at vmas on
    mapping->i_mmap, and not on i_mmap_nonlinear.

    Miklos
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