Re: [PATCH 6.6.y] mm/huge_memory: use folio's memcg inside __folio_split()

["Zi Yan" <ziy@nvidia.com>]

On Sat Sep 12, 2026 at 11:26 AM EDT, Sasha Levin wrote:
> Thanks for the review, Johannes.
>
> I'm holding the 6.6.y patch for now, because 6.12.y needs this first.
> c299a2285d9d ("mm/huge_memory: use folio's memcg inside
> __folio_split()") is absent from 6.12.y, and we don't queue a fix on an
> older tree while a newer one still lacks it.
>
> 6.12.y also needs its own version rather than this one. I tried your 6.6.y
> patch against it and it fails at mm/huge_memory.c:2646. The two trees have
> different shapes here: 6.6.y has split_huge_page_to_list(page, list) using
> XA_STATE, while 6.12.y has split_huge_page_to_list_to_order(page, list,
> new_order) using XA_STATE_ORDER.
>
> Zi Yan, could you send a 6.12.y backport? Once that one is in I'll take
> both together.

Done. See https://lore.kernel.org/all/20260912182926.1326147-1-ziy@nvidia.com/

BTW, I see you also sent one[1], but it seems that it is using a
non-existing get_mem_cgroup_from_folio(). What is that for? Thanks.

[1] https://lore.kernel.org/all/20260903223027.1739434-1-sashal@kernel.org/


-- 
Best Regards,
Yan, Zi