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: <1319149574.13035.6.camel@jshin-Toonie>
Date:	Thu, 20 Oct 2011 17:26:14 -0500
From:	Jacob Shin <jacob.shin@....com>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Yinghai Lu <yinghai.lu@...cle.com>,
	"Herrmann3, Andreas" <Andreas.Herrmann3@....com>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-kernel@...r.kernel.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 Thu, 2011-10-20 at 17:20 -0500, H. Peter Anvin wrote:
> 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?

Hm, okay, it calls e820_end_of_low_ram_pfn() which effectively is !=
E820_RAM.

I'll fix this, test, then resend.

Thanks!

-Jacob Shin
Advanced Micro Devices, Inc.

> 
> 	-hpa
> 
> 



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