Re: [PATCH v2 5/6] mm/page_vma_mapped: use huge_ptep_get() for hugetlb

[Muchun Song]

> On Jul 2, 2026, at 13:13, Dev Jain <dev.jain@xxxxxxx> wrote:
> 
> check_pte() is the final validation step in page_vma_mapped_walk().
> It reads pvmw->pte with ptep_get() to decide whether the entry maps
> the PFN range being walked. For hugetlb VMAs, that pointer refers
> to a hugetlb entry.
> 
> On arches which provide their own huge_ptep_get() to dereference a huge
> pte pointer, accessing via ptep_get() would cause pte_pfn(),
> pte_present() etc to misbehave.
> 
> It is not clear whether this has a trivially visible effect to userspace.
> 
> Use huge_ptep_get() to dereference a huge pte pointer.
> 
> Fixes: ace71a19cec5 ("mm: introduce page_vma_mapped_walk()")
> Cc: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Dev Jain <dev.jain@xxxxxxx>

Reviewed-by: Muchun Song <muchun.song@xxxxxxxxx>

Thanks.