Re: [PATCH] mm: teach mincore_hugetlb about pte markers

Andrew Morton
2023-03-03T01:52:16Z

On Thu, 2 Mar 2023 17:32:48 -0500 Peter Xu <peterx@redhat.com> wrote:

> On Thu, Mar 02, 2023 at 10:24:04PM +0000, James Houghton wrote:
> > By checking huge_pte_none(), we incorrectly classify PTE markers as
> > "present". Instead, check huge_pte_none_mostly(), classifying PTE
> > markers the same as if the PTE were completely blank.
> >
> > PTE markers, unlike other kinds of swap entries, don't reference any
> > physical page and don't indicate that a physical page was mapped
> > previously. As such, treat them as non-present for the sake of
> > mincore().
> >
> > Fixes: 5c041f5d1f23 ("mm: teach core mm about pte markers")
> > Signed-off-by: James Houghton <jthoughton@google.com>
>
> Acked-by: Peter Xu <peterx@redhat.com>
>

I think I'll add cc:stable to this.