From patchwork Thu Mar 31 06:36:30 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jisheng Zhang X-Patchwork-Id: 603948 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 3qbFJT1PL2z9sf6 for ; Thu, 31 Mar 2016 17:40:41 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752588AbcCaGka (ORCPT ); Thu, 31 Mar 2016 02:40:30 -0400 Received: from mx0a-0016f401.pphosted.com ([67.231.148.174]:21515 "EHLO mx0a-0016f401.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752674AbcCaGk3 (ORCPT ); Thu, 31 Mar 2016 02:40:29 -0400 Received: from pps.filterd (m0045849.ppops.net [127.0.0.1]) by mx0a-0016f401.pphosted.com (8.16.0.11/8.16.0.11) with SMTP id u2V6aqYs000401; Wed, 30 Mar 2016 23:40:21 -0700 Received: from sc-exch01.marvell.com ([199.233.58.181]) by mx0a-0016f401.pphosted.com with ESMTP id 2206d175cs-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-SHA384 bits=256 verify=NOT); Wed, 30 Mar 2016 23:40:20 -0700 Received: from SC-EXCH02.marvell.com (10.93.176.82) by SC-EXCH01.marvell.com (10.93.176.81) with Microsoft SMTP Server (TLS) id 15.0.1104.5; Wed, 30 Mar 2016 23:40:19 -0700 Received: from maili.marvell.com (10.93.176.43) by SC-EXCH02.marvell.com (10.93.176.82) with Microsoft SMTP Server id 15.0.1104.5 via Frontend Transport; Wed, 30 Mar 2016 23:40:19 -0700 Received: from xhacker.marvell.com (unknown [10.37.135.134]) by maili.marvell.com (Postfix) with ESMTP id E9F503F7040; Wed, 30 Mar 2016 23:40:18 -0700 (PDT) From: Jisheng Zhang To: , , CC: , , Jisheng Zhang Subject: [PATCH] net: mvneta: remove useless RX descriptor prefetch Date: Thu, 31 Mar 2016 14:36:30 +0800 Message-ID: <1459406190-2334-1-git-send-email-jszhang@marvell.com> X-Mailer: git-send-email 2.8.0.rc3 MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2016-03-31_02:, , signatures=0 X-Proofpoint-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=0 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1601100000 definitions=main-1603310089 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org The rx descriptors are allocated using dma_alloc_coherent, so prefetch doesn't really happen at all. Signed-off-by: Jisheng Zhang --- drivers/net/ethernet/marvell/mvneta.c | 1 - 1 file changed, 1 deletion(-) diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c index 5880871..6c09a27 100644 --- a/drivers/net/ethernet/marvell/mvneta.c +++ b/drivers/net/ethernet/marvell/mvneta.c @@ -757,7 +757,6 @@ mvneta_rxq_next_desc_get(struct mvneta_rx_queue *rxq) int rx_desc = rxq->next_desc_to_proc; rxq->next_desc_to_proc = MVNETA_QUEUE_NEXT_DESC(rxq, rx_desc); - prefetch(rxq->descs + rxq->next_desc_to_proc); return rxq->descs + rx_desc; }