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

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Message-ID: <50BFE88D.1000800@zytor.com>
Date:	Wed, 05 Dec 2012 16:36:29 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	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,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: Use PCI ROMs from EFI boot services

On 12/05/2012 04:15 PM, Yinghai Lu wrote:
> 
> -#ifndef CONFIG_DEBUG_BOOT_PARAMS
> -struct boot_params __initdata boot_params;
> -#else
>  struct boot_params boot_params;
> -#endif

> 
> 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.
> 

I don't see why that isn't the right fix.  We copy the data into
boot_params early in the boot; that *is* the official copy as far as the
kernel is concerned.

So this patch very much seems like The Right Thing.

	-hpa


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