Re: [PATCH v1 1/2] KVM: s390: fix issues when splitting folios

[David Hildenbrand]

> +	struct folio *folio = page_folio(page);
>   	int rc;
>   
>   	lockdep_assert_not_held(&mm->mmap_lock);
> @@ -2645,7 +2646,11 @@ int kvm_s390_wiggle_split_folio(struct mm_struct *mm, struct folio *folio, bool
>   	lru_add_drain_all();
>   	if (split) {
>   		folio_lock(folio);
> -		rc = split_folio(folio);
> +		rc = min_order_for_split(folio);
> +		if (rc > 0)
> +			rc = -EINVAL;
> +		if (!rc)
> +			rc = split_huge_page_to_list_to_order(page, NULL, 0);

split_huge_page() ?

But see my reply to #2. Likely we should just undo the refactorings you 
added while moving the code.

--
Cheers,

David / dhildenb