Add new split_non_compound_page() to simplify make_alloc_exact().

Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
---
 mm/page_alloc.c | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index b6eeae39f4d0..e1d229b75f27 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3042,6 +3042,15 @@ void free_unref_folios(struct folio_batch *folios)
 	folio_batch_reinit(folios);
 }
 
+static void split_non_compound_page(struct page *page, unsigned int order)
+{
+	VM_BUG_ON_PAGE(PageCompound(page), page);
+
+	split_page_owner(page, order, 0);
+	pgalloc_tag_split(page_folio(page), order, 0);
+	split_page_memcg(page, order);
+}
+
 /*
  * split_page takes a non-compound higher-order page, and splits it into
  * n (1<<order) sub-pages: page[0..n]
@@ -3054,14 +3063,12 @@ void split_page(struct page *page, unsigned int order)
 {
 	int i;
 
-	VM_BUG_ON_PAGE(PageCompound(page), page);
 	VM_BUG_ON_PAGE(!page_count(page), page);
 
 	for (i = 1; i < (1 << order); i++)
 		set_page_refcounted(page + i);
-	split_page_owner(page, order, 0);
-	pgalloc_tag_split(page_folio(page), order, 0);
-	split_page_memcg(page, order);
+
+	split_non_compound_page(page, order);
 }
 EXPORT_SYMBOL_GPL(split_page);
 
@@ -5315,9 +5322,7 @@ static void *make_alloc_exact(unsigned long addr, unsigned int order,
 		struct page *page = virt_to_page((void *)addr);
 		struct page *last = page + nr;
 
-		split_page_owner(page, order, 0);
-		pgalloc_tag_split(page_folio(page), order, 0);
-		split_page_memcg(page, order);
+		split_non_compound_page(page, order);
 		while (page < --last)
 			set_page_refcounted(last);
 
-- 
2.27.0