linux-kernel - Re: [PATCH 02/11] x86: sysfb: remove sysfb when probing real hw

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Message-ID: <20140123171436.GA27345@gmail.com>
Date:	Thu, 23 Jan 2014 18:14:36 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	David Herrmann <dh.herrmann@...il.com>
Cc:	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	"linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>,
	Dave Airlie <airlied@...il.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Tom Gundersen <teg@...m.no>
Subject: Re: [PATCH 02/11] x86: sysfb: remove sysfb when probing real hw


* David Herrmann <dh.herrmann@...il.com> wrote:

> >> +#ifdef CONFIG_X86_SYSFB
> >> +#  include <asm/sysfb.h>
> >> +#endif
> >
> > I guess a single space is sufficient?
> >
> > Better yet, I'd include sysfb.h unconditionally:
> 
> Unconditionally won't work as only x86 has this header. [...]

Well, in non-x86 code an #ifdef x86 looks ugly as well - but I guess 
better than not building.

> [...] If there's a way to place a dummy into asm-generic which is 
> picked if arch/xy/include/asm/ doesn't have the header, let me know. 

Not that I know of.

> But if I include it unconditionally without any fallback, this will 
> fail on non-x86. And adding the header to all archs seems overkill.

So why not drop the x86-ism and rename it to CONFIG_PLATFORM_SYSFB? 
Some platforms configure it, some don't. Then the prototypes could 
move into include/linux/sysfb.h or so and would be platform agnostic.

Thanks,

	Ingo
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