linux-kernel - Re: [PATCH] x86: CONFIG_EFI should select CONFIG

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Message-ID: <4DF0DB8D.5080207@redhat.com>
Date:	Thu, 09 Jun 2011 10:41:17 -0400
From:	Peter Jones <pjones@...hat.com>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Matthew Garrett <mjg@...hat.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: CONFIG_EFI should select CONFIG_RELOCATABLE

On 06/09/2011 10:37 AM, H. Peter Anvin wrote:
> On 06/09/2011 07:32 AM, Matthew Garrett wrote:
>> EFI doesn't provide any guarantees that any given address will be free,
>> so the bootloader must have the freedom to position the kernel
>> appropriately. Make CONFIG_EFI select CONFIG_RELOCATABLE in order to
>> ensure that this constraint is satisfiable.
>>
>> Signed-off-by: Matthew Garrett<mjg@...hat.com>
>> ---
>>   arch/x86/Kconfig |    1 +
>>   1 files changed, 1 insertions(+), 0 deletions(-)
>>
>> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
>> index da34972..580cd31 100644
>> --- a/arch/x86/Kconfig
>> +++ b/arch/x86/Kconfig
>> @@ -1454,6 +1454,7 @@ config ARCH_USES_PG_UNCACHED
>>   config EFI
>>   	bool "EFI runtime service support"
>>   	depends on ACPI
>> +	select RELOCATABLE
>>   	---help---
>>   	  This enables the kernel to use EFI runtime services that are
>>   	  available (such as the EFI variable services).
>
> Can we make this a depends on instead of select?

Seems weird to me - when you're configuring the kernel, you're more likely
to know that you want EFI than to remember that that requires relocation.

-- 
         Peter
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