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

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Date:	Thu, 19 Dec 2013 20:19:50 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Stephen Warren <swarren@...dotorg.org>
Cc:	David Herrmann <dh.herrmann@...il.com>,
	linux-kernel@...r.kernel.org, Takashi Iwai <tiwai@...e.de>,
	the arch/x86 maintainers <x86@...nel.org>,
	linux-fbdev@...r.kernel.org,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	stable@...r.kernel.org
Subject: Re: [PATCH v3] x86: sysfb: remove sysfb when probing real hw


* Stephen Warren <swarren@...dotorg.org> wrote:

> On 12/19/2013 11:55 AM, Ingo Molnar wrote:
> > 
> > * Stephen Warren <swarren@...dotorg.org> wrote:
> > 
> >> On 12/19/2013 03:13 AM, David Herrmann wrote:
> >>> With CONFIG_X86_SYSFB=y, probing real hw-drivers may result in
> >>> resource-conflicts and drivers will refuse to load. A call to
> >>> request_mem_region() will fail, if the region overlaps with the mem-region
> >>> used by simplefb. The common desktop DRM drivers (intel, nouveau, radeon)
> >>> are not affected as they don't reserve their resources, but some others
> >>> do, including (nvidiafb, cirrus, ..).
> >>
> >> I have validated that this doesn't cause any regressions on the/a
> >> non-x86 platform using simplefb, although given the main point of this
> >> patch is to fix issues on x86, I'm rather hesitant to give a tested-by
> >> tag in case someone looking back interprets it incorrectly:-)
> > 
> > Tested-on-ARM-by: Stephen Warren <swarren@...dotorg.org>
> 
> I suppose with CC: stable there's some precedent for a comment after the
> tag, so perhaps:
> 
> Tested-by: Stephen Warren <swarren@...dotorg.org> # on ARM only

That works too.

Thanks,

	Ingo
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