From patchwork Mon Aug 10 12:28:56 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Miaohe Lin X-Patchwork-Id: 1342820 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming-netdev@ozlabs.org Delivered-To: patchwork-incoming-netdev@ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=netdev-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=huawei.com Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4BQFfX5pNXz9sTT for ; Mon, 10 Aug 2020 22:30:12 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726690AbgHJMaJ (ORCPT ); Mon, 10 Aug 2020 08:30:09 -0400 Received: from szxga05-in.huawei.com ([45.249.212.191]:9257 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726141AbgHJMaJ (ORCPT ); Mon, 10 Aug 2020 08:30:09 -0400 Received: from DGGEMS405-HUB.china.huawei.com (unknown [172.30.72.59]) by Forcepoint Email with ESMTP id 5224D82BFD0073A8DD2D; Mon, 10 Aug 2020 20:30:07 +0800 (CST) Received: from huawei.com (10.175.104.175) by DGGEMS405-HUB.china.huawei.com (10.3.19.205) with Microsoft SMTP Server id 14.3.487.0; Mon, 10 Aug 2020 20:29:57 +0800 From: Miaohe Lin To: , , , , , , , , , , CC: , , Subject: [PATCH] net: eliminate meaningless memcpy to data in pskb_carve_inside_nonlinear() Date: Mon, 10 Aug 2020 08:28:56 -0400 Message-ID: <20200810122856.5423-1-linmiaohe@huawei.com> X-Mailer: git-send-email 2.19.1 MIME-Version: 1.0 X-Originating-IP: [10.175.104.175] X-CFilter-Loop: Reflected Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org The skb_shared_info part of the data is assigned in the following loop. It is meaningless to do a memcpy here. Signed-off-by: Miaohe Lin --- net/core/skbuff.c | 3 --- 1 file changed, 3 deletions(-) diff --git a/net/core/skbuff.c b/net/core/skbuff.c index 7e2e502ef519..5b983c9472f5 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -5952,9 +5952,6 @@ static int pskb_carve_inside_nonlinear(struct sk_buff *skb, const u32 off, size = SKB_WITH_OVERHEAD(ksize(data)); - memcpy((struct skb_shared_info *)(data + size), - skb_shinfo(skb), offsetof(struct skb_shared_info, - frags[skb_shinfo(skb)->nr_frags])); if (skb_orphan_frags(skb, gfp_mask)) { kfree(data); return -ENOMEM;