linux-kernel - Re: [PATCH 3/5] x86: Only direct map addresses that are marked as E820

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Date:	Fri, 24 Aug 2012 21:21:18 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Jacob Shin <jacob.shin@....com>
CC:	X86-ML <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
	Yinghai Lu <yinghai@...nel.org>, Tejun Heo <tj@...nel.org>,
	Dave Young <dyoung@...hat.com>,
	Chao Wang <chaowang@...hat.com>,
	Vivek Goyal <vgoyal@...hat.com>,
	Andreas Herrmann <andreas.herrmann3@....com>,
	Borislav Petkov <borislav.petkov@....com>
Subject: Re: [PATCH 3/5] x86: Only direct map addresses that are marked as
 E820_RAM

On 08/24/2012 09:20 PM, Jacob Shin wrote:
>>
>> What is the benefit?
>
> So that in the case where we have E820_RAM right above 1MB, we don't
> call init_memory_mapping twice, first on 0 ~ 1MB and then 1MB ~ something
>
> we only call it once. 0 ~ something.
>

So what is the benefit?

	-hpa


-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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