linux-kernel - Re: [PATCH RESEND 0/8] x86 platform framebuffers

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Date:	Sat, 3 Aug 2013 17:46:33 +0200
From:	David Herrmann <dh.herrmann@...il.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	David Airlie <airlied@...ux.ie>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Stephen Warren <swarren@...dotorg.org>,
	Peter Jones <pjones@...hat.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
	linux-fbdev@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH RESEND 0/8] x86 platform framebuffers

Hi

On Sat, Aug 3, 2013 at 1:39 AM, H. Peter Anvin <hpa@...or.com> wrote:
> On 08/02/2013 05:05 AM, David Herrmann wrote:
>> Hi
>>
>> I cut down my previous series to no longer include the SimpleDRM driver. If
>> anyone is interested, you can find it here:
>>   http://lwn.net/Articles/558104/
>> I will resend it once these preparation patches are in.
>>
>> Changes since v2:
>>  - added common x86 formats (reported by hpa) (patch #5)
>>
>> This whole series (including simpledrm) is tested by Stephen and me. I would be
>> glad if maintainers could ack/nack this so I can continue my work.
>>
>> This series is pretty small and just converts x86 to use platform-devices
>> instead of global objects to pass framebuffer data to drivers. The commit
>> messages explain everything in detail.
>> The idea is to create a "platform-framebuffer" device which drivers can bind to.
>> If x86 boot code detectes efi or vesa framebuffers, it creates efi-framebuffer
>> or vesa-framebuffer devices instead.
>>
>> Additionally, if the modes are compatible, "simple-framebuffer" devices are
>> created so simplefb can be used on x86. This feature is only enabled if
>> CONFIG_X86_SYSFB is selected (off by default) so users without simplefb still
>> get boot logs.
>>
>>  @Stephen: I wasn't sure whether you tested the efi/vesa framebuffer changes,
>> too, so I didn't add your tested-by there. And I changed patch #5 so I dropped
>> it there, too. Thanks for testing!
>>
>
> I am getting a bunch of new warnings with this patchset, typically of
> the form:
>
>
> /home/hpa/kernel/distwork/drivers/video/arkfb.c:1019:23: warning: cast
> to pointer from integer of different size [-Wint-to-pointer-cast]
>   par->state.vgabase = (void __iomem *) vga_res.start;
>                        ^
> /home/hpa/kernel/distwork/drivers/video/s3fb.c: In function ‘s3_pci_probe’:
> /home/hpa/kernel/distwork/drivers/video/s3fb.c:1186:23: warning: cast to
> pointer from integer of different size [-Wint-to-pointer-cast]
>   par->state.vgabase = (void __iomem *) vga_res.start;
>                        ^
> I have pushed it out to a topic branch in the tip tree, partly to give
> Fengguang's build bot a run at it (it is excellent at spotting the
> origin of new warnings), but this needs to be fixed; we will not merge
> this branch in its current form.

Thanks for looking at it. However, these warnings seem unrelated to my
patchset. I didn't change any vga/fb headers nor did I touch
arkfb/s3fb. Furthermore, I cannot reproduce these warnings. "vga_res"
is a "struct resource", "->start" is of type "resource_size_t" which
is typedef'ed to "phys_addr_t". Seems like the build-bot used some
random config with CONFIG_PHYS_ADDR_T_64BIT set but building on 32bit
(or something like that).

Is there any place where I can see the compiler log? Or the used .config file?

Thanks
David
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