linux-kernel - Re: [PATCH] x86, efi: Convert efi_phys_get

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Message-ID: <1320751673.3572.128.camel@mfleming-mobl1.ger.corp.intel.com>
Date:	Tue, 08 Nov 2011 11:27:53 +0000
From:	Matt Fleming <matt@...sole-pimps.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	linux-kernel@...r.kernel.org, Matthew Garrett <mjg@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, x86@...nel.org,
	Zhang Rui <rui.zhang@...el.com>,
	"Ma, Maurice" <maurice.ma@...el.com>
Subject: Re: [PATCH] x86, efi: Convert efi_phys_get_time() args to physical
 addresses

On Mon, 2011-11-07 at 11:08 -0800, H. Peter Anvin wrote:
> On 11/07/2011 03:31 AM, Matt Fleming wrote:
> > 
> > Ping?
> > 
> 
> Is this -stable material?

I don't think so. It only affects things early in boot (before
efi_enter_virtual_mode()) is called. Once we've called
SetVirtualAddressMap() we call virt_efi_get_time() to get the time and
everything works fine.

I don't think this bug is even visible to the user apart from the "Oops:
efitime: can't read time!" message displayed on boot. It certainly
doesn't cause a crash or anything like that.

-- 
Matt Fleming, Intel Open Source Technology Center

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