Re: [PATCH 0/4] mm: page_ext: Introduce new iteration API

[David Hildenbrand]

On 20.02.25 00:52, Andrew Morton wrote:
> On Tue, 18 Feb 2025 21:17:46 -0500 Luiz Capitulino <luizcap@xxxxxxxxxx> wrote:
>
> > To fix this, this series introduces a new iteration API for page extension
> > objects. The API checks if the next page extension object can be retrieved
> > from the current section or if it needs to look up for it in another
> > section.
> >
> > ...
>
> A regression since 6.12, so we should backport the fix.
>
> > ...
> >
> >   include/linux/page_ext.h | 67 +++++++++++++++++++++++++++++++++++++---
> >   mm/page_ext.c            | 48 ++++++++++++++++++++++++++++
> >   mm/page_owner.c          | 61 +++++++++++++++++-------------------
> >   mm/page_table_check.c    | 39 +++++++----------------
> >   4 files changed, 152 insertions(+), 63 deletions(-)
>
> That's a lot to backport!
>
> Is there some quick-n-dirty fixup we can apply for the sake of -stable
> kernels, then work on this long-term approach for future kernels?

I assume we could loop in 
reset_page_owner()/page_table_check_free()/set_page_owner()/page_table_check_alloc(). 
Not-so-nice for upstream, maybe good-enough for stable. Still nasty :)

OTOH, we don't really expect a lot of conflicts.

--
Cheers,

David / dhildenb