linux-kernel - Re: [PATCH]: PCI: GART iommu alignment fixes [v2]

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Message-ID: <489CF599.8050601@redhat.com>
Date:	Fri, 08 Aug 2008 21:40:41 -0400
From:	Prarit Bhargava <prarit@...hat.com>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
CC:	jbarnes@...tuousgeek.org, muli@...ibm.com, joro@...tes.org,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	jakub@...hat.com
Subject: Re: [PATCH]: PCI: GART iommu alignment fixes [v2]



FUJITA Tomonori wrote:
> On Fri, 8 Aug 2008 09:15:51 -0700
> Jesse Barnes <jbarnes@...tuousgeek.org> wrote:
>
>   
>> On Friday, August 8, 2008 8:18 am Prarit Bhargava wrote:
>>     
>>> --- a/include/linux/dma-mapping.h
>>> +++ b/include/linux/dma-mapping.h
>>> @@ -78,7 +78,7 @@ static inline unsigned int dma_set_max_seg_size(struct
>>> device
>>>  static inline unsigned long dma_get_seg_boundary(struct device *dev)
>>>  {
>>>         return dev->dma_parms ?
>>> -               dev->dma_parms->segment_boundary_mask : 0xffffffff;
>>> +               dev->dma_parms->segment_boundary_mask : 0xffffffffUL;
>>>  }
>>>       
>> Yeah generally you need to cast values like this when working with real 
>> unsigned long values rather than ints, but this *should* still be safe 
>> (barring a compiler bug).  The return type is unsigned long, so even if you 
>> just return 0xffffffff the right thing should still happen...
>>     
>
> I told Prarid that the overflow should not happen here again and
> again...
>   

I misunderstood what was going on here.

P.
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