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

Peter Xu
2023-03-02T22:33:48Z

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>

Thanks, James.

--
Peter Xu