[PATCH v5 1/3] mm/huge_memory: add split_huge_page_to_order()

Zi Yan
2025-10-31T16:19:39Z

When caller does not supply a list to split_huge_page_to_list_to_order(),
use split_huge_page_to_order() instead.

Acked-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Reviewed-by: Wei Yang <richard.weiyang@gmail.com>
Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: Barry Song <baohua@kernel.org>
Reviewed-by: Lance Yang <lance.yang@linux.dev>
Signed-off-by: Zi Yan <ziy@nvidia.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);
}
static inline int split_huge_page(struct page *page)
@@ -590,6 +593,11 @@ split_huge_page_to_list_to_order(struct page *page, struct list_head *list,
VM_WARN_ON_ONCE_PAGE(1, page);
return -EINVAL;
}
+static inline int split_huge_page_to_order(struct page *page, unsigned int new_order)
+{
+ VM_WARN_ON_ONCE_PAGE(1, page);
+ return -EINVAL;
+}
static inline int split_huge_page(struct page *page)
{
VM_WARN_ON_ONCE_PAGE(1, page);
--
2.51.0