Re: [PATCH v2 8/9] mm: introduce and use vm_normal_page_pud()

David Hildenbrand
2025-07-17T20:14:41Z

On 17.07.25 22:03, Lorenzo Stoakes wrote:
> On Thu, Jul 17, 2025 at 01:52:11PM +0200, David Hildenbrand wrote:
>> Let's introduce vm_normal_page_pud(), which ends up being fairly simple
>> because of our new common helpers and there not being a PUD-sized zero
>> folio.
>>
>> Use vm_normal_page_pud() in folio_walk_start() to resolve a TODO,
>> structuring the code like the other (pmd/pte) cases. Defer
>> introducing vm_normal_folio_pud() until really used.
>
> I mean fine :P but does anybody really use this?

This is a unified PFN walker (!hugetlb + hugetlb), so you can easily run
into hugetlb PUDs, DAX PUDs and huge pfnmap (vfio) PUDs :)

--
Cheers,

David / dhildenb