netdev - Re: [PATCH v3 1/4] net/macb: fix truncate warnings

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Date:	Tue, 23 Oct 2012 14:00:44 +0200
From:	Lothar Waßmann <LW@...O-electronics.de>
To:	David Miller <davem@...emloft.net>
Cc:	David.Laight@...LAB.COM, bgat@...lgatliff.com,
	netdev@...r.kernel.org, manabian@...il.com,
	nicolas.ferre@...el.com, hskinnemoen@...il.com,
	plagnioj@...osoft.com, linux-arm-kernel@...ts.infradead.org,
	egtvedt@...fundet.no
Subject: Re: [PATCH v3 1/4] net/macb: fix truncate warnings

Hi,

David Miller writes:
> From: "David Laight" <David.Laight@...LAB.COM>
> Date: Tue, 23 Oct 2012 09:21:11 +0100
> 
> >> When building macb on x86_64 the following warnings show up:
> >>   drivers/net/ethernet/cadence/macb.c: In function macb_interrupt:
> >>   drivers/net/ethernet/cadence/macb.c:556:4: warning: large integer implicitly truncated to unsigned type [-Woverflow]
> > ...
> >> -			macb_writel(bp, IDR, ~0UL);
> >> +			macb_writel(bp, IDR, -1);
> > 
> > Seems wrong to fix an error with an unsigned value
> > by using -1.
> 
> -1 is equally an unsigned value of all 1's and completely legitimate.
> The correction being made here is one of size not signedness.
> 
You could use '~0' (without the 'UL').


Lothar Waßmann
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