linux-kernel - Re: [PATCH 0/5] Only create direct mappings for E820

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Message-ID: <20120811195125.GD2874@dhcp-172-17-108-109.mtv.corp.google.com>
Date:	Sat, 11 Aug 2012 12:51:25 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Jacob Shin <jacob.shin@....com>
Cc:	X86-ML <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
	Yinghai Lu <yinghai@...nel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andreas Herrmann <andreas.herrmann3@....com>
Subject: Re: [PATCH 0/5] Only create direct mappings for E820_RAM regions

On Thu, Aug 09, 2012 at 04:23:04PM -0500, Jacob Shin wrote:
> This is a revision of an earlier attempt, with suggestions and concernes
> from previous conversation (https://lkml.org/lkml/2011/12/16/486) taken
> into account.
> 
> The following patchset creates direct mappings only for E820_RAM regions
> between 0 ~ max_low_pfn and 4GB ~ max_pfn. And leaves non-E820_RAM
> unmapped.

Can you please explain why this is necessary here and in patch
descriptions?

Thanks.

-- 
tejun
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