From patchwork Mon Dec 13 13:26:18 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: xiujianfeng X-Patchwork-Id: 12673875 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3BF4CC433EF for ; Mon, 13 Dec 2021 13:27:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233117AbhLMN15 (ORCPT ); Mon, 13 Dec 2021 08:27:57 -0500 Received: from szxga03-in.huawei.com ([45.249.212.189]:29188 "EHLO szxga03-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231784AbhLMN1z (ORCPT ); Mon, 13 Dec 2021 08:27:55 -0500 Received: from dggpeml500023.china.huawei.com (unknown [172.30.72.57]) by szxga03-in.huawei.com (SkyGuard) with ESMTP id 4JCMhP43nxz972c; Mon, 13 Dec 2021 21:25:41 +0800 (CST) Received: from ubuntu1804.huawei.com (10.67.174.58) by dggpeml500023.china.huawei.com (7.185.36.114) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.20; Mon, 13 Dec 2021 21:27:52 +0800 From: Xiu Jianfeng To: , , , , CC: , , , Subject: [PATCH -next] lockdep: Use memset_startat() helper in reinit_class() Date: Mon, 13 Dec 2021 21:26:18 +0800 Message-ID: <20211213132618.105737-1-xiujianfeng@huawei.com> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 X-Originating-IP: [10.67.174.58] X-ClientProxiedBy: dggems705-chm.china.huawei.com (10.3.19.182) To dggpeml500023.china.huawei.com (7.185.36.114) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-hardening@vger.kernel.org use memset_startat() helper to simplify the code, there is no functional change in this patch. Signed-off-by: Xiu Jianfeng Acked-by: Waiman Long Reviewed-by: Kees Cook --- kernel/locking/lockdep.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c index 4a882f83aeb9..89b3df51fd98 100644 --- a/kernel/locking/lockdep.c +++ b/kernel/locking/lockdep.c @@ -6011,13 +6011,10 @@ static void zap_class(struct pending_free *pf, struct lock_class *class) static void reinit_class(struct lock_class *class) { - void *const p = class; - const unsigned int offset = offsetof(struct lock_class, key); - WARN_ON_ONCE(!class->lock_entry.next); WARN_ON_ONCE(!list_empty(&class->locks_after)); WARN_ON_ONCE(!list_empty(&class->locks_before)); - memset(p + offset, 0, sizeof(*class) - offset); + memset_startat(class, 0, key); WARN_ON_ONCE(!class->lock_entry.next); WARN_ON_ONCE(!list_empty(&class->locks_after)); WARN_ON_ONCE(!list_empty(&class->locks_before));