linux-kernel - Re: [PATCH 1/2] iommu/tegra: smmu: Simplify allocation at once

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Date:	Tue, 15 May 2012 10:09:13 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Hiroshi Doyu <hdoyu@...dia.com>
CC:	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
	"grant.likely@...retlab.ca" <grant.likely@...retlab.ca>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	"joerg.roedel@....com" <joerg.roedel@....com>,
	"thierry.reding@...onic-design.de" <thierry.reding@...onic-design.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>
Subject: Re: [PATCH 1/2] iommu/tegra: smmu: Simplify allocation at once

On 05/15/2012 02:26 AM, Hiroshi Doyu wrote:
> Stephen Warren <swarren@...dotorg.org> wrote @ Tue, 15 May 2012 01:34:15 +0200:
> 
>> On 05/14/2012 01:16 PM, Hiroshi DOYU wrote:
>>> To simplify the code, alloc necessary data at once.
>>>
>>> Signed-off-by: Hiroshi DOYU <hdoyu@...dia.com>
>>> ---
>>> This patch requires:
>>>
>>>     [PATCH 1/2] iommu/tegra: smmu: Add device tree support for SMMU
>>>         http://marc.info/?l=linux-tegra&m=133663641107327&w=2
>>>
>>> Also the above patch requires:
>>>
>>>     [PATCH 1/1] dt: Add general DMA window parser
>>>         http://marc.info/?l=linux-tegra&m=133671302703840&w=2
>>
>> I know I've been harping on about dependencies, but you typically only
>> need to mention them if the dependencies are not already checked into
>> the branch you expect this patch to be checked into.
>>
>>> -	smmu = devm_kzalloc(dev, sizeof(*smmu), GFP_KERNEL);
>>> +	if (of_property_read_u32(dev->of_node, "nvidia,#asids", &asids))
>>> +		return -ENODEV;
>>
>> I believe you need to change the asids variable from int to u32 to avoid
>> a warning here.
> 
> There's no warning but it's allowed because of "-Wno-pointer-sign". It

That's odd. I'm sure I have seen this warning recently when calling this
API, but you're right, I'm not able to trigger that warning right now,
so this is fine.
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