linux-kernel - [PATCH v2 4/4] mm/huge_memory: fix folio split stats counting

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Message-ID: <20251122025529.1562592-5-ziy@nvidia.com>
Date: Fri, 21 Nov 2025 21:55:29 -0500
From: Zi Yan <ziy@...dia.com>
To: David Hildenbrand <david@...nel.org>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
	Zi Yan <ziy@...dia.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>,
	Miaohe Lin <linmiaohe@...wei.com>,
	Naoya Horiguchi <nao.horiguchi@...il.com>,
	Wei Yang <richard.weiyang@...il.com>,
	Balbir Singh <balbirs@...dia.com>,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 4/4] mm/huge_memory: fix folio split stats counting

The "return <error code>" statements for error checks at the beginning of
__folio_split() skip necessary count_vm_event() and count_mthp_stat() at
the end of the function. Fix these by replacing them with
"ret = <error code>; goto out;".

Signed-off-by: Zi Yan <ziy@...dia.com>
---
 mm/huge_memory.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index ebc3ba0907fd..a42c4f29ce4f 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -3954,16 +3954,20 @@ static int __folio_split(struct folio *folio, unsigned int new_order,
 	VM_WARN_ON_ONCE_FOLIO(!folio_test_locked(folio), folio);
 	VM_WARN_ON_ONCE_FOLIO(!folio_test_large(folio), folio);
 
-	if (folio != page_folio(split_at) || folio != page_folio(lock_at))
-		return -EINVAL;
+	if (folio != page_folio(split_at) || folio != page_folio(lock_at)) {
+		ret = -EINVAL;
+		goto out;
+	}
 
-	if (new_order >= old_order)
-		return -EINVAL;
+	if (new_order >= old_order) {
+		ret = -EINVAL;
+		goto out;
+	}
 
 	ret = folio_check_splittable(folio, new_order, split_type,
 				     /* warn = */ true);
 	if (ret)
-		return ret;
+		goto out;
 
 	if (is_anon) {
 		/*
-- 
2.51.0