From nobody Fri Oct 3 20:29:07 2025 Received: from szxga05-in.huawei.com (szxga05-in.huawei.com [45.249.212.191]) (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 0F33D23D7CB; Tue, 26 Aug 2025 02:51:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.191 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756176721; cv=none; b=hqkKPPYKDCdVfxvLjPL1a8qYSERdv+NToSq3199l0EiiQ8rp4ITcQm0Uj5J9sC4PrLe8Y7SQn9XkdXXdxKVyI+AP0HE3lQdUQhKyTTWbkHRM3yLzn3UsIpn7pUxPGIodbRRLx3pzA+WJPQys995Xr3KSZMvdnjmv9hTFLqYIA2Q= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756176721; c=relaxed/simple; bh=rXK1J0sn8NjDlpQXEbUam7aOhFmNtqzcAWh58sERuBs=; h=From:To:CC:Subject:Date:Message-ID:MIME-Version:Content-Type; b=CvNoFyxO0I2FcSuSXaqcUwn9PFqXzEPR1Hw+8ZwSJnGr7eILueTUW1XETy7oVaSSNROv9PYlQAEnKhnbNh7zQkNG4SKRT+VtHJM9TBKfTxBDf6JQofIpIFkre1PTSKvLZ1yN5gdNbrbd3CpdtiAoGxSntyIl7d5K1p9w+KzR7zM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com; spf=pass smtp.mailfrom=huawei.com; arc=none smtp.client-ip=45.249.212.191 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huawei.com Received: from mail.maildlp.com (unknown [172.19.88.163]) by szxga05-in.huawei.com (SkyGuard) with ESMTP id 4c9sYl2zpjz1R92w; Tue, 26 Aug 2025 10:48:59 +0800 (CST) Received: from dggpemf500002.china.huawei.com (unknown [7.185.36.57]) by mail.maildlp.com (Postfix) with ESMTPS id 15099180044; Tue, 26 Aug 2025 10:51:55 +0800 (CST) Received: from huawei.com (10.50.159.234) by dggpemf500002.china.huawei.com (7.185.36.57) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.11; Tue, 26 Aug 2025 10:51:54 +0800 From: Yue Haibing To: , , , , , , CC: , , Subject: [PATCH net-next] ipv6: annotate data-races around devconf->rpl_seg_enabled Date: Tue, 26 Aug 2025 10:52:06 +0800 Message-ID: <20250826025206.303325-1-yuehaibing@huawei.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: kwepems100002.china.huawei.com (7.221.188.206) To dggpemf500002.china.huawei.com (7.185.36.57) Content-Type: text/plain; charset="utf-8" devconf->rpl_seg_enabled can be changed concurrently from /proc/sys/net/ipv6/conf, annotate lockless reads on it. Signed-off-by: Yue Haibing --- net/ipv6/exthdrs.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/net/ipv6/exthdrs.c b/net/ipv6/exthdrs.c index d1ef9644f826..a23eb8734e15 100644 --- a/net/ipv6/exthdrs.c +++ b/net/ipv6/exthdrs.c @@ -494,10 +494,8 @@ static int ipv6_rpl_srh_rcv(struct sk_buff *skb) =20 idev =3D __in6_dev_get(skb->dev); =20 - accept_rpl_seg =3D net->ipv6.devconf_all->rpl_seg_enabled; - if (accept_rpl_seg > idev->cnf.rpl_seg_enabled) - accept_rpl_seg =3D idev->cnf.rpl_seg_enabled; - + accept_rpl_seg =3D min(READ_ONCE(net->ipv6.devconf_all->rpl_seg_enabled), + READ_ONCE(idev->cnf.rpl_seg_enabled)); if (!accept_rpl_seg) { kfree_skb(skb); return -1; --=20 2.34.1