linux-kernel - Re: Use PCI ROMs from EFI boot services

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Date:	Wed, 5 Dec 2012 16:15:56 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-efi@...r.kernel.org, mfleming@...el.com, dwmw2@...radead.org,
	"H. Peter Anvin" <hpa@...or.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: Use PCI ROMs from EFI boot services

On Mon, Dec 3, 2012 at 12:02 PM, Seth Forshee
<seth.forshee@...onical.com> wrote:
> On Thu, Oct 25, 2012 at 11:35:57AM -0600, Bjorn Helgaas wrote:
>> On Thu, Aug 23, 2012 at 10:36 AM, Matthew Garrett <mjg@...hat.com> wrote:
>> > V3 just fixes all the casting issues and incorporates David's change in
>> > search ordering.
>>
>> I think there's still a section mismatch issue with these patches, so
>> I haven't merged them yet.
>>
>> I rebased my pci/mjg-pci-roms-from-efi branch to v3.7-rc2, and if we
>> get this issue fixed I'll put it in -next as v3.8 material.
>
> I still don't see this series in -next, so I take it the section
> mismatch was never fixed? How about the following?
>
>
>
> From ece31852159a6b2cf9a059031638354e9817a6a6 Mon Sep 17 00:00:00 2001
> From: Seth Forshee <seth.forshee@...onical.com>
> Date: Mon, 3 Dec 2012 13:55:50 -0600
> Subject: [PATCH] x86: Don't discard boot_params
>
> boot_params is now used at runtime on EFI systems to stash option ROMs
> that aren't available after exiting boot services, so it can no longer
> be marked __initdata.
>
> Signed-off-by: Seth Forshee <seth.forshee@...onical.com>
> ---
>  arch/x86/kernel/setup.c |    4 ----
>  1 file changed, 4 deletions(-)
>
> diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
> index 468e98d..6e13035 100644
> --- a/arch/x86/kernel/setup.c
> +++ b/arch/x86/kernel/setup.c
> @@ -143,11 +143,7 @@ int default_check_phys_apicid_present(int phys_apicid)
>  }
>  #endif
>
> -#ifndef CONFIG_DEBUG_BOOT_PARAMS
> -struct boot_params __initdata boot_params;
> -#else
>  struct boot_params boot_params;
> -#endif
>
>  /*
>   * Machine setup..

No, that is not a right fix

We should only cache pointer to setup_data.

at the same time we should export setup_data into /sys, so kexec could
append this pointer to command of
second kernel, just like kexec append acpi_rsdp.
That should address DavidW's concern.


Yinghai
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