netdev - Re: [PATCH net] net: phy: fix a signedness bug in genphy

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Message-ID: <ZHXKt2Zfr/zSqIMq@shell.armlinux.org.uk>
Date: Tue, 30 May 2023 11:06:47 +0100
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Dan Carpenter <dan.carpenter@...aro.org>
Cc: Paolo Abeni <pabeni@...hat.com>, Jakub Kicinski <kuba@...nel.org>,
	Andrew Lunn <andrew@...n.ch>,
	Oleksij Rempel <linux@...pel-privat.de>,
	Heiner Kallweit <hkallweit1@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>, netdev@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [PATCH net] net: phy: fix a signedness bug in genphy_loopback()

On Tue, May 30, 2023 at 10:49:22AM +0100, Russell King (Oracle) wrote:
> On Tue, May 30, 2023 at 12:23:32PM +0300, Dan Carpenter wrote:
> > I don't see an issue in r8169_main.c and in drivers/net/phy/phy_device.c
> > then I only find the bug from this patch.
> 
> I agree - inspecting the code reveals that "val" would be of type "int".
> 
> > +	BUILD_BUG_ON((typeof(val))~0ULL > 0);				\
> 
> I've just thrown this in to my builds, and building for arm64 using
> debian stable's gcc, I don't see any errors with genphy_loopback()
> suitably hacked, even with r8169 included in the build.

Also successfully built with 32-bit ARM gcc.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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