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SubjectRe: [PATCH v4] mm, hugetlb: fix racy resv_huge_pages underflow on UFFDIO_COPY
> > Mina, does this patch depend on changes to restore_reserve_on_error()?
> >
>
> Yes, this patch (and only this patch) depends on your changes for
> complete and correct functionality. I'm not sure what's the impact

...of missing your changes aside from the underflow. The userfaultfd
tests still pass.

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