linux-kernel - Re: [PATCH 1/2] x86: Sanity check the e820 against the SRAT table using e820 map only

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Message-ID: <20090511093612.GD26444@elte.hu>
Date:	Mon, 11 May 2009 11:36:12 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Mel Gorman <mel@....ul.ie>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] x86: Sanity check the e820 against the SRAT table
	using e820 map only


* Yinghai Lu <yinghai@...nel.org> wrote:

> -	e820ram = max_pfn - absent_pages_in_range(0, max_pfn);
> +	e820ram = max_pfn - (e820_hole_size(0, max_pfn<<PAGE_SHIFT)>>PAGE_SHIFT);

btw., it would be nice to have a debug check that prints a warning 
if the SRAT does not cover all RAM, or if it covers RAM that is not 
present in the e820 map. Such a warning might alert us to double 
check all the PXM settings in the SRAT and could uncover more quirks 
like the above ...

	Ingo
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