Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753373AbdFSS6M (ORCPT + 2 others); Mon, 19 Jun 2017 14:58:12 -0400 Received: from wtarreau.pck.nerim.net ([62.212.114.60]:52560 "EHLO 1wt.eu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753822AbdFSSh6 (ORCPT ); Mon, 19 Jun 2017 14:37:58 -0400 From: Willy Tarreau To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, linux@roeck-us.net Cc: Paul Burton , "David S . Miller" , Willy Tarreau Subject: [PATCH 3.10 082/268] net: ti: cpmac: Fix compiler warning due to type confusion Date: Mon, 19 Jun 2017 20:29:41 +0200 Message-Id: <1497897167-14556-83-git-send-email-w@1wt.eu> X-Mailer: git-send-email 2.8.0.rc2.1.gbe9624a In-Reply-To: <1497897167-14556-1-git-send-email-w@1wt.eu> References: <1497897167-14556-1-git-send-email-w@1wt.eu> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Return-Path: From: Paul Burton commit 2f5281ba2a8feaf6f0aee93356f350855bb530fc upstream. cpmac_start_xmit() used the max() macro on skb->len (an unsigned int) and ETH_ZLEN (a signed int literal). This led to the following compiler warning: In file included from include/linux/list.h:8:0, from include/linux/module.h:9, from drivers/net/ethernet/ti/cpmac.c:19: drivers/net/ethernet/ti/cpmac.c: In function 'cpmac_start_xmit': include/linux/kernel.h:748:17: warning: comparison of distinct pointer types lacks a cast (void) (&_max1 == &_max2); \ ^ drivers/net/ethernet/ti/cpmac.c:560:8: note: in expansion of macro 'max' len = max(skb->len, ETH_ZLEN); ^ On top of this, it assigned the result of the max() macro to a signed integer whilst all further uses of it result in it being cast to varying widths of unsigned integer. Fix this up by using max_t to ensure the comparison is performed as unsigned integers, and for consistency change the type of the len variable to unsigned int. Signed-off-by: Paul Burton Signed-off-by: David S. Miller Signed-off-by: Willy Tarreau --- drivers/net/ethernet/ti/cpmac.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/ti/cpmac.c b/drivers/net/ethernet/ti/cpmac.c index 31bbbca..6bcb2b8 100644 --- a/drivers/net/ethernet/ti/cpmac.c +++ b/drivers/net/ethernet/ti/cpmac.c @@ -557,7 +557,8 @@ fatal_error: static int cpmac_start_xmit(struct sk_buff *skb, struct net_device *dev) { - int queue, len; + int queue; + unsigned int len; struct cpmac_desc *desc; struct cpmac_priv *priv = netdev_priv(dev); @@ -567,7 +568,7 @@ static int cpmac_start_xmit(struct sk_buff *skb, struct net_device *dev) if (unlikely(skb_padto(skb, ETH_ZLEN))) return NETDEV_TX_OK; - len = max(skb->len, ETH_ZLEN); + len = max_t(unsigned int, skb->len, ETH_ZLEN); queue = skb_get_queue_mapping(skb); netif_stop_subqueue(dev, queue); -- 2.8.0.rc2.1.gbe9624a