linux-kernel - Re: [PATCH] x86: serialize EFI time accesses on rtc

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Message-ID: <20110719111933.GA13122@srcf.ucam.org>
Date:	Tue, 19 Jul 2011 12:19:34 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Jan Beulich <JBeulich@...ell.com>
Cc:	mingo@...e.hu, tglx@...utronix.de, hpa@...or.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: serialize EFI time accesses on rtc_lock

On Tue, Jul 19, 2011 at 11:53:07AM +0100, Jan Beulich wrote:
> The EFI specification requires that callers of the time related runtime
> functions serialize with other CMOS accesses in the kernel, as the EFI
> time functions may choose to also use the legacy CMOS RTC.
> 
> Besides fixing a latent bug, this is a prerequisite to safely enable
> the rtc-efi driver for x86, which ought to be preferred over rtc-cmos
> on all EFI platforms.

ACK in principle, although I've just merged this and the IA64 code 
together which makes that more awkward. I can fix it up, though.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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