linux-kernel - Re: [PATCH v3] x86: sysfb: remove sysfb when probing real hw

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Date:	Thu, 19 Dec 2013 18:03:08 +0100
From:	David Herrmann <dh.herrmann@...il.com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Takashi Iwai <tiwai@...e.de>,
	Stephen Warren <swarren@...dotorg.org>,
	"the arch/x86 maintainers" <x86@...nel.org>,
	"linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	stable <stable@...r.kernel.org>
Subject: Re: [PATCH v3] x86: sysfb: remove sysfb when probing real hw

Hi

On Thu, Dec 19, 2013 at 5:36 PM, Ingo Molnar <mingo@...nel.org> wrote:
>
> * David Herrmann <dh.herrmann@...il.com> wrote:
>
>> --- a/drivers/video/fbmem.c
>> +++ b/drivers/video/fbmem.c
>> @@ -35,6 +35,9 @@
>>
>>  #include <asm/fb.h>
>>
>> +#if IS_ENABLED(CONFIG_X86)
>> +#include <asm/sysfb.h>
>> +#endif
>
> I think this can be written as:
>
> #ifdef CONFIG_X86
> # include <asm/sysfb.h>
> #endif
>
> also ... the dependency on a large, unrelated option like CONFIG_X86
> looks pretty ugly here - is there no other, more specific CONFIG_
> option that can be used here - such as CONFIG_FB_SIMPLE or
> CONFIG_X86_SYSFB?
>
>> +#if IS_ENABLED(CONFIG_X86)
>> +     sysfb_unregister(apert, primary);
>> +#endif
>
> Ditto.

CONFIG_X86 is probably never 'm'.. will fix that.
It was CONFIG_X86_SYSFB before and that works, too, but the broader
X86 seemed more appropriate as sysfb is available on all x86.

Note that I have patches here locally which move
sysfb_register/unregister to drivers/video/sysfb.c and add
include/linux/sysfb.h with dummies if CONFIG_SYSFB is not selected to
avoid the #ifdef. This will allow other architectures to do
gfx-hand-over, too. They seem too big for stable, though. That's why I
split them up and added it to x86/kernel/sysfb.c first.

Thanks
David
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