linux-kernel - Re: [PATCH] x86: EFI_PAGE

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Message-ID: <47C306A1.2040909@zytor.com>
Date:	Mon, 25 Feb 2008 10:19:13 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	"Huang, Ying" <ying.huang@...el.com>,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>, Andi Kleen <ak@...e.de>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: EFI_PAGE_SHIFT fix

Ingo Molnar wrote:
> * Huang, Ying <ying.huang@...el.com> wrote:
> 
>> Make x86 EFI code works when EFI_PAGE_SHIFT != PAGE_SHIFT. The 
>> memrage_efi_to_native() provided in this patch can be used on other 
>> EFI platform such as IA64 too.
>>
>> This patch has been tested on Intel x86_64 platform with EFI 64/32 
>> firmware.
> 
> this is mostly cosmetic, isnt it - because currently nobody expects 
> EFI_PAGE_SHIFT and PAGE_SHIFT to ever change on x86, right? I've queued 
> up your patch for 2.6.26, ok?
> 

There keeps being a lot of talk about a larger x86 pagesize, either 
involving future hardware support or via page clustering in the kernel.

Going beyond a 48-bit address space (in long mode) may mean increasing 
the page size.

	-hpa
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