linux-kernel - Re: [PATCH v3 2/4] mm/huge_memory: add split_huge_page_to

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Message-ID: <b63f9223-4c5c-4e2c-9986-02052a3d7f78@redhat.com>
Date: Wed, 22 Oct 2025 22:13:06 +0200
From: David Hildenbrand <david@...hat.com>
To: Zi Yan <ziy@...dia.com>, linmiaohe@...wei.com, jane.chu@...cle.com
Cc: kernel@...kajraghav.com, akpm@...ux-foundation.org, mcgrof@...nel.org,
 nao.horiguchi@...il.com, Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
 Baolin Wang <baolin.wang@...ux.alibaba.com>,
 "Liam R. Howlett" <Liam.Howlett@...cle.com>, Nico Pache <npache@...hat.com>,
 Ryan Roberts <ryan.roberts@....com>, Dev Jain <dev.jain@....com>,
 Barry Song <baohua@...nel.org>, Lance Yang <lance.yang@...ux.dev>,
 "Matthew Wilcox (Oracle)" <willy@...radead.org>,
 Wei Yang <richard.weiyang@...il.com>, Yang Shi <shy828301@...il.com>,
 linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-mm@...ck.org
Subject: Re: [PATCH v3 2/4] mm/huge_memory: add split_huge_page_to_order()

On 22.10.25 05:35, Zi Yan wrote:
> When caller does not supply a list to split_huge_page_to_list_to_order(),
> use split_huge_page_to_order() instead.
> 
> Signed-off-by: Zi Yan <ziy@...dia.com>
> ---
>   include/linux/huge_mm.h | 12 ++++++++++--
>   1 file changed, 10 insertions(+), 2 deletions(-)
> 
> diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
> index 7698b3542c4f..34f8d8453bf3 100644
> --- a/include/linux/huge_mm.h
> +++ b/include/linux/huge_mm.h
> @@ -381,6 +381,10 @@ static inline int split_huge_page_to_list_to_order(struct page *page, struct lis
>   {
>   	return __split_huge_page_to_list_to_order(page, list, new_order, false);
>   }
> +static inline int split_huge_page_to_order(struct page *page, unsigned int new_order)
> +{
> +	return split_huge_page_to_list_to_order(page, NULL, new_order);
> +}
>   
>   /*
>    * try_folio_split_to_order - try to split a @folio at @page to @new_order using
> @@ -400,8 +404,7 @@ static inline int try_folio_split_to_order(struct folio *folio,
>   		struct page *page, unsigned int new_order)
>   {
>   	if (!non_uniform_split_supported(folio, new_order, /* warns= */ false))
> -		return split_huge_page_to_list_to_order(&folio->page, NULL,
> -				new_order);
> +		return split_huge_page_to_order(&folio->page, new_order);
>   	return folio_split(folio, new_order, page, NULL);

Much more readable

Acked-by: David Hildenbrand <david@...hat.com>

-- 
Cheers

David / dhildenb