linux-kernel - RE: [PATCH] net: hix5hd2_gmac: avoid integer overload warning

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Message-ID: <063D6719AE5E284EB5DD2968C1650D6D1CBB97A6@AcuExch.aculab.com>
Date:	Fri, 16 Oct 2015 11:14:44 +0000
From:	David Laight <David.Laight@...LAB.COM>
To:	'Arnd Bergmann' <arnd@...db.de>,
	huangdaode <huangdaode@...ilicon.com>
CC:	"davem@...emloft.net" <davem@...emloft.net>,
	"joe@...ches.com" <joe@...ches.com>,
	"liguozhu@...ilicon.com" <liguozhu@...ilicon.com>,
	"Yisen.Zhuang@...wei.com" <Yisen.Zhuang@...wei.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linuxarm@...wei.com" <linuxarm@...wei.com>,
	"salil.mehta@...wei.com" <salil.mehta@...wei.com>,
	"kenneth-lee-2012@...mail.com" <kenneth-lee-2012@...mail.com>,
	"xuwei5@...ilicon.com" <xuwei5@...ilicon.com>,
	"lisheng011@...wei.com" <lisheng011@...wei.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"lipeng321@...wei.com" <lipeng321@...wei.com>
Subject: RE: [PATCH] net: hix5hd2_gmac: avoid integer overload warning

From: Arnd Bergmann
> Sent: 16 October 2015 11:01
> 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:
...
>  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);

ISTM that just means that the constants shouldn't be 'long'.

	David

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