netdev - [PATCH] net: hix5hd2_gmac: avoid integer overload warning

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Message-ID: <4752736.dePgPCNd9q@wuerfel>
Date:	Fri, 16 Oct 2015 12:00:51 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	huangdaode <huangdaode@...ilicon.com>
Cc:	davem@...emloft.net, joe@...ches.com, liguozhu@...ilicon.com,
	Yisen.Zhuang@...wei.com, netdev@...r.kernel.org,
	linuxarm@...wei.com, salil.mehta@...wei.com,
	kenneth-lee-2012@...mail.com, xuwei5@...ilicon.com,
	lisheng011@...wei.com, linux-kernel@...r.kernel.org,
	lipeng321@...wei.com
Subject: [PATCH] net: hix5hd2_gmac: avoid integer overload warning

BITS_RX_EN is an 'unsigned long' constant, so the ones complement of that
has bits set that do not fit into a 32-bit variable on 64-bit architectures,
which causes a harmless gcc warning:

drivers/net/ethernet/hisilicon/hix5hd2_gmac.c: In function 'hix5hd2_port_disable':
drivers/net/ethernet/hisilicon/hix5hd2_gmac.c:374:2: warning: large integer implicitly truncated to unsigned type [-Woverflow]
  writel_relaxed(~(BITS_RX_EN | BITS_TX_EN), priv->base + PORT_EN);

This adds a cast to (u32) to tell gcc that the code is indeed fine.

Signed-off-by: Arnd Bergmann <arnd@...db.de>

diff --git a/drivers/net/ethernet/hisilicon/hix5hd2_gmac.c b/drivers/net/ethernet/hisilicon/hix5hd2_gmac.c
index a5e077eac99a..e51892d518ff 100644
--- a/drivers/net/ethernet/hisilicon/hix5hd2_gmac.c
+++ b/drivers/net/ethernet/hisilicon/hix5hd2_gmac.c
@@ -371,7 +371,7 @@ static void hix5hd2_port_enable(struct hix5hd2_priv *priv)
 
 static void hix5hd2_port_disable(struct hix5hd2_priv *priv)
 {
-	writel_relaxed(~(BITS_RX_EN | BITS_TX_EN), priv->base + PORT_EN);
+	writel_relaxed(~(u32)(BITS_RX_EN | BITS_TX_EN), priv->base + PORT_EN);
 	writel_relaxed(0, priv->base + DESC_WR_RD_ENA);
 }
 

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