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

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Date:	Tue, 23 Oct 2012 09:21:11 +0100
From:	"David Laight" <David.Laight@...LAB.COM>
To:	"Joachim Eastwood" <manabian@...il.com>, <nicolas.ferre@...el.com>,
	<davem@...emloft.net>, <hskinnemoen@...il.com>,
	<egtvedt@...fundet.no>, <plagnioj@...osoft.com>,
	<bgat@...lgatliff.com>
Cc:	<netdev@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH v3 1/4] net/macb: fix truncate warnings

> 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.

	David



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