linux-kernel - Re: [PATCH 1/3] video: fbdev: vt8623fb: suppress build warning

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Date:	Thu, 4 Dec 2014 09:56:32 +0200
From:	Tomi Valkeinen <tomi.valkeinen@...com>
To:	Prabhakar Lad <prabhakar.csengg@...il.com>
CC:	Sudip Mukherjee <sudipm.mukherjee@...il.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	LFBDEV <linux-fbdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] video: fbdev: vt8623fb: suppress build warning

On 04/12/14 09:46, Sudip Mukherjee wrote:
> On Thu, Dec 04, 2014 at 09:05:46AM +0200, Tomi Valkeinen wrote:
>> On 03/12/14 20:29, Prabhakar Lad wrote:
>>> On Wed, Dec 3, 2014 at 11:49 AM, Tomi Valkeinen <tomi.valkeinen@...com> wrote:
>>>> On 27/11/14 00:07, Lad, Prabhakar wrote:
>>>>> this patch fixes following build warning:
>>>>> drivers/video/fbdev/vt8623fb.c: In function ‘vt8623_pci_probe’:
>>>>> drivers/video/fbdev/vt8623fb.c:734:23: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
>>>>>   par->state.vgabase = (void __iomem *) vga_res.start;
>>>>>                        ^
>>>>> Signed-off-by: Lad, Prabhakar <prabhakar.csengg@...il.com>
>>>>> ---
>>>>>  drivers/video/fbdev/vt8623fb.c | 2 +-
>>>>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>>>>
>>>>> diff --git a/drivers/video/fbdev/vt8623fb.c b/drivers/video/fbdev/vt8623fb.c
>>>>> index 5c7cbc6..ea7f056 100644
>>>>> --- a/drivers/video/fbdev/vt8623fb.c
>>>>> +++ b/drivers/video/fbdev/vt8623fb.c
>>>>> @@ -731,7 +731,7 @@ static int vt8623_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
>>>>>
>>>>>       pcibios_bus_to_resource(dev->bus, &vga_res, &bus_reg);
>>>>>
>>>>> -     par->state.vgabase = (void __iomem *) vga_res.start;
>>>>> +     par->state.vgabase = (void __iomem *) (unsigned long) vga_res.start;
>>>>
>>>> This does look quite ugly... Where does the warning come from in the
>>>> first place. Isn't vga_res.start (resource_size_t) the size of a pointer?
>>>>
>>> Yes looks ugly, I am not sure what you meant from 'where does this warning
>>> come from' its in the commit message.
>>
>> I meant why is there a warning at all. With a quick glance,
>> vga_res.start is the size of a pointer. So the sizes of the integer and
>> the pointer should be the same. But the warning still says "of different
>> size".
> 
> poking my nose into your discussion.
> I tried to see the warning, and I re-compiled like make W=1 M=drivers/video/fbdev/ (before that make clean M=drivers/video/fbdev was done)
> I can see warning with many other files, but drivers/video/fbdev/vt8623fb.o was quiet and there was no warning.
> I tested with next=20141203.
> did i miss something in checking the warning ?

I don't see the warning either when compiling for arm or x86_64. On what
architecture do you see the warning?

 Tomi



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