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

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Date:	Thu, 4 Dec 2014 13:16:41 +0530
From:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:	Tomi Valkeinen <tomi.valkeinen@...com>
Cc:	Prabhakar Lad <prabhakar.csengg@...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 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 ?

thanks
sudip

> 
>  Tomi
> 
> 


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