linux-kernel - Re: [PATCH 5/5] x86: efi: allow basic init with mixed 32/64-bit efi/kernel

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Message-ID: <1325762483.3635.21.camel@mfleming-mobl1.ger.corp.intel.com>
Date:	Thu, 05 Jan 2012 11:21:23 +0000
From:	Matt Fleming <matt.fleming@...el.com>
To:	Olof Johansson <olof@...om.net>
Cc:	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Matthew Garrett <mjg@...hat.com>, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org
Subject: Re: [PATCH 5/5] x86: efi: allow basic init with mixed 32/64-bit
 efi/kernel

On Tue, 2012-01-03 at 09:11 -0800, Olof Johansson wrote:
> Traditionally the kernel has refused to setup EFI at all if there's been
> a mismatch in 32/64-bit mode between EFI and the kernel.
> 
> On some platforms that boot natively through EFI (Chrome OS being one),
> we still need to get at least some of the static data such as memory
> configuration out of EFI. Runtime services aren't as critical, and
> it's a significant amount of work to implement switching between the
> operating modes to call between kernel and firmware for thise cases. So
> I'm ignoring it for now.
> 
> v3:
> * Reorganized to a series of patches to make it easier to review, and
>   do some of the cleanups I had left out before.
> 
> v2:
> * Added graceful error handling for 32-bit kernel that gets passed
>   EFI data above 4GB.
> * Removed some warnings that were missed in first version.
> 
> Signed-off-by: Olof Johansson <olof@...om.net>
> ---
>  arch/x86/include/asm/efi.h  |    2 +-
>  arch/x86/kernel/setup.c     |   10 ++-
>  arch/x86/platform/efi/efi.c |  234 ++++++++++++++++++++++++++++++++-----------
>  include/linux/efi.h         |   45 ++++++++
>  4 files changed, 228 insertions(+), 63 deletions(-)

This needs resubmitting as you're undoing the changes you've made in
PATCH 2/5, i.e. stuff like this,

> @@ -254,7 +257,7 @@ int efi_set_rtc_mmss(unsigned long nowtime)
>  
>  	status = efi.get_time(&eft, &cap);
>  	if (status != EFI_SUCCESS) {
> -		pr_err("Oops: efitime: can't read time!\n");
> +		printk(KERN_ERR "Oops: efitime: can't read time!\n");
>  		return -1;
>  	}


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