netdev - Re: [PATCH 1/2] [v4] net: emac: emac gigabit ethernet controller driver

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Date:	Wed, 13 Apr 2016 22:07:46 +0200
From:	Bjørn Mork <bjorn@...k.no>
To:	Timur Tabi <timur@...eaurora.org>
Cc:	Shanker Donthineni <shankerd@...eaurora.org>,
	kbuild test robot <lkp@...el.com>, kbuild-all@...org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	sdharia@...eaurora.org, Greg Kroah-Hartman <greg@...ah.com>,
	vikrams@...eaurora.org, cov@...eaurora.org, gavidov@...eaurora.org,
	Rob Herring <robh+dt@...nel.org>, andrew@...n.ch,
	bjorn.andersson@...aro.org, Mark Langsdorf <mlangsdo@...hat.com>,
	Jon Masters <jcm@...hat.com>,
	Andy Gross <agross@...eaurora.org>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH 1/2] [v4] net: emac: emac gigabit ethernet controller driver

Timur Tabi <timur@...eaurora.org> writes:
> Shanker Donthineni wrote:
>>>> >>     drivers/net/ethernet/qualcomm/emac/emac-mac.c: In function 'emac_mac_up':
>>>>>>>> >>>> >>drivers/net/ethernet/qualcomm/emac/emac-mac.c:1076:9: warning: large integer implicitly truncated to unsigned type [-Woverflow]
>>>> >>       writel(~DIS_INT, adpt->base + EMAC_INT_STATUS);
>>> >
>>> >This doesn't happen on arm64, and I don't know how to fix it.  DIS_INT is defined as:
>>> >
>>> >     #define DIS_INT          BIT(31)
>>> >
>> Try with (1U<<31).
>>
>
> Except that Gilad was previously asked to use the BIT() macros:
>
> 	https://lkml.org/lkml/2015/12/15/797

So typecast it.

  writel((u32)~DIS_INT, adpt->base + EMAC_INT_STATUS);


I believe the reason you don't see this on arm64 is that the writel
macro includes the typecast there.  But it doesn't on x86_64


Bjørn