From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D35EC1A6803 for ; Tue, 16 Jun 2026 01:35:06 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781573708; cv=none; b=n7+t23vN4+xB9HqW/KdPvGHKwtXBOlba1OAZSSLeiXTQ5wyCs90E5mnVXQxV0T/K9hjYKeZZunxEAPKVpvSDGf5bgLPCeujtkY/fHMY3LXuvfUZ32K9v3um/170xhQSivzmpI/BDtYLtSot8lOnH19f8N5bt6zyQI+m1sygl2Kc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781573708; c=relaxed/simple; bh=55FKlZPYBdEjaSQaK3gjgP3dTq9fiwBWokO0cIRt4gA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Qme+iXpZKyk8Tis0PxAV7E7RYwzvh525RgV0oWJo4YqRIY+TSTd+nucm0luJCCcwzVeucEbSPZqJIzDCSAZX0E10YkyxdQZZ5eEW569oa7p7ccB6gF0LQBqydcF8xWeEoLHoZg2ll9mm0/diPiuyQpJ4/F18zFKtnOkZKqc5ACI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=DqNYAUlI; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="DqNYAUlI" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C81641F000E9; Tue, 16 Jun 2026 01:35:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1781573706; bh=OssSHsxO1g+tHbXT/xHaULs0sSqtbeGXLKSdnmCYVJo=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=DqNYAUlIsVXCnakGJQq1XVAbrGiZRvoFOSWHu3W8/82VeatoJDX8P+gQCnz2EOyC/ GKHYyriZi/GLLlC8fO4yK76YvZ379P+jAco5DW3IAyeBfuaIO1ByR9RTfOQa+urFnE rgrP1s3lGyFs0YTmd7b4Yc4OnVFys8Ufv8ZqUVr2eSPu592D3+T8AquLyphGCD/atr zV35pwdcaVJL33YukJUkYkZihGeUrQJZVXZavinjimJ/CuHgU05MlMnIujAAf4p0QE hVM9MYdptVlxnsGdwRAyPii6LdztQVnnDHy0z/2+4pq/8Pd1IzY/3k0hV6v+A2v2An dZ7waY2W9qp4w== From: Sasha Levin To: stable@vger.kernel.org Cc: Yin Tirui , Lorenzo Stoakes , "David Hildenbrand (arm)" , Lance Yang , Dev Jain , Baolin Wang , Barry Song , Chen Jun , Kefeng Wang , "Liam R. Howlett" , Nico Pache , Ryan Roberts , Vlastimil Babka , Yang Shi , Zi Yan , Andrew Morton , Sasha Levin Subject: [PATCH 5.15.y] mm/huge_memory: update file PMD counter before folio_put() Date: Mon, 15 Jun 2026 21:35:03 -0400 Message-ID: <20260616013503.2708473-1-sashal@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <2026061512-encrypt-banking-e175@gregkh> References: <2026061512-encrypt-banking-e175@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Yin Tirui [ Upstream commit 8d878059924f12c1bc24556a92ec56add74de3c8 ] __split_huge_pmd_locked() updates the file/shmem RSS counter after dropping the PMD mapping's folio reference. If folio_put() drops the last reference, mm_counter_file() can later read freed folio state via folio_test_swapbacked(). Move the counter update before folio_put(). Link: https://lore.kernel.org/20260526101337.1984081-1-yintirui@huawei.com Fixes: fadae2953072 ("thp: use mm_file_counter to determine update which rss counter") Signed-off-by: Yin Tirui Reviewed-by: Lorenzo Stoakes Acked-by: David Hildenbrand (arm) Reviewed-by: Lance Yang Reviewed-by: Dev Jain Cc: Baolin Wang Cc: Barry Song Cc: Chen Jun Cc: Kefeng Wang Cc: Liam R. Howlett Cc: Nico Pache Cc: Ryan Roberts Cc: Vlastimil Babka Cc: Yang Shi Cc: Zi Yan Cc: Signed-off-by: Andrew Morton Signed-off-by: Sasha Levin --- mm/huge_memory.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/mm/huge_memory.c b/mm/huge_memory.c index e9c5de967b2c15..934c08de74f42d 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -1994,7 +1994,9 @@ static void __split_huge_pmd_locked(struct vm_area_struct *vma, pmd_t *pmd, if (!PageReferenced(page) && pmd_young(old_pmd)) SetPageReferenced(page); page_remove_rmap(page, true); + add_mm_counter(mm, mm_counter_file(page), -HPAGE_PMD_NR); put_page(page); + return; } add_mm_counter(mm, mm_counter_file(page), -HPAGE_PMD_NR); return; -- 2.53.0