linux-kernel - Re: [PATCH] x86: enable rtc-efi

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Message-ID: <20110705180227.GD30531@srcf.ucam.org>
Date:	Tue, 5 Jul 2011 19:02:27 +0100
From:	Matthew Garrett <mjg@...hat.com>
To:	Jan Beulich <JBeulich@...ell.com>
Cc:	mingo@...e.hu, tglx@...utronix.de, hpa@...or.com,
	rtc-linux@...glegroups.com, dannf@...com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: enable rtc-efi

On Tue, Jul 05, 2011 at 08:38:51AM +0100, Jan Beulich wrote:
> Besides a Kconfig change this just requires creating a respective
> platform device.

"During runtime, if a PC-AT CMOS device is present in the platform the 
caller must synchronize access to the device before calling GetTime()."

This shouldn't be enabled on PC hardware without locking to avoid races 
with direct ahrdware access.

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