Re: [PATCH 1/3] mm/huge_memory: add folio_split_driver_managed()

[David Hildenbrand (Arm)]

>>> Because splitting a folio is really something different than splitting just some
>>> compound page (no mapping/pagecache/whatever involved).
>>
>> Yup.
> 
> It sounds like split_compound_page() gets some love (David, Lorenzo, and Matthew
> all want it). I can add one to mm/page_alloc.c, so that Matthew can build
> his patchset on top of it.

In there we should verify that it is neither slab nor a folio. For now, we can
only test for folios indirectly by considering the large_rmappable flag and
hugetlb page type.

Likely we should simply disallow any page type for now (and large_rmappable).

-- 
Cheers,

David