linux-kernel - Re: [PATCH 1/1] x86: Exclude E820_RESERVED regions and memory holes above 4 GB from direct mapping.

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Message-ID: <4EA09EA2.3030203@zytor.com>
Date:	Thu, 20 Oct 2011 15:20:18 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Jacob Shin <jacob.shin@....com>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Yinghai Lu <yinghai.lu@...cle.com>,
	Andreas Herrmann <andreas.herrmann3@....com>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] x86: Exclude E820_RESERVED regions and memory holes
 above 4 GB from direct mapping.

On 10/20/2011 02:15 PM, Jacob Shin wrote:
> On systems with very large memory (1 TB in our case), BIOS may report a
> reserved region or a hole in the E820 map, even above the 4 GB range. Exclude
> these from the direct mapping.

> +			if (ei->type == E820_RESERVED)
> +				continue;

This should probably be ei->type != E820_RAM or something similar.  I
haven't looked yet, what does the < 4 GiB code do?

	-hpa

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