Re: [PATCH 4/4] mm/mempolicy: skip zone device folios when queueing folios

[Gregory Price <gourry@gourry.net>]

On Thu, Aug 06, 2026 at 03:16:03PM +0100, Lorenzo Stoakes (ARM) wrote:
> On Thu, Aug 06, 2026 at 04:11:21PM +0200, David Hildenbrand (Arm) wrote:
> > On 8/6/26 15:36, Lorenzo Stoakes (ARM) wrote:
> > > On Thu, Aug 06, 2026 at 03:25:50PM +0200, David Hildenbrand (Arm) wrote:
> > >> On 7/28/26 21:47, Gregory Price wrote:
> > >>>  mm/mempolicy.c | 4 ++++
> > >>> @@ -797,6 +799,8 @@ static int queue_folios_hugetlb(pte_t *pte, unsigned long hmask,
> > >>>  	folio = pfn_folio(pte_pfn(ptep));
> > >>>  	if (!queue_folio_required(folio, qp))
> > >>>  		goto unlock;
> > >>> +	if (folio_is_zone_device(folio))
> > >>> +		goto unlock;
> > >>
> > >> Leave the hugetlb part alone. hugetlb folios will never be ZONE_DEVICE.
> > >
> > > <Insert leave Britney alone meme here> :P
> > >
> > > But dear God we have got to find ways to stop hugetlb being this big stupid
> > > nightmare that every single path of mm has to put an asterix next to itself
> > > about!
> >
> > Yeah, possibly unifying the code (possibly, because it's a mess) but not
> > replicating checks that don't make any sense for hugetlb.
> 
> Yup agreed.
>

No disagreement here.  I'll drop this.

~Geregory