linux-kernel - Re: [PATCH 7/7] efi_rtc: probe function error out in case no efi runtime enabled

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Date:	Fri, 3 Oct 2014 13:11:19 +0100
From:	Matt Fleming <matt@...sole-pimps.org>
To:	Mark Salter <msalter@...hat.com>
Cc:	Dave Young <dyoung@...hat.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, hpa@...or.com,
	Alessandro Zummo <a.zummo@...ertech.it>,
	Leif Lindholm <leif.lindholm@...aro.org>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-efi@...r.kernel.org, Daniel Kiper <daniel.kiper@...cle.com>,
	Russ Anderson <rja@....com>, rtc-linux@...glegroups.com
Subject: Re: [PATCH 7/7] efi_rtc: probe function error out in case no efi
 runtime enabled

(Argh, this was sat in my outbox for over a week)

On Thu, 25 Sep, at 05:38:50PM, Mark Salter wrote:
> On Thu, 2014-09-25 at 22:18 +0100, Matt Fleming wrote:
> > On Mon, 22 Sep, at 12:33:29PM, Mark Salter wrote:
> > > 
> > > Is this still needed after commit da167ad7638759:
> > > 
> > >   rtc: ia64: allow other architectures to use EFI RTC
> > 
> > Umm... we should really look at disabling this for x86, since the EFI
> > time functions don't work on a bunch of machines I've got here.
> > 
> > And it looks like someone enabled this driver and triggered an oops on
> > their 32-bit EFI tablet,
> > 
> >   https://bugzilla.kernel.org/show_bug.cgi?id=84241#c21
> 
> Previously, it depended on IA64. If it's not worth the trouble for
> x86 then I'd say have it depend on !X86 also. Newer EFI-supporting
> architectures are unlikely to have the same legacy issues as x86
> so I don't think it'll end up being an ever growing list.
 
Yeah that's what I was thinking. For x86, it's the age old "Windows
doesn't use it, so it was never validated" issue.

I'll send an update.

-- 
Matt Fleming, Intel Open Source Technology Center
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