linux-kernel - Re: [PATCH] trim memory not covered by WB MTRRs

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Date:	Wed, 27 Jun 2007 19:02:35 +0200
From:	Pim Zandbergen <P.Zandbergen@...roscoop.nl>
To:	Jesse Barnes <jesse.barnes@...el.com>
CC:	Mauro Giachero <mauro.giachero@...il.com>,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	Andi Kleen <andi@...stfloor.org>,
	Justin Piszcz <jpiszcz@...idpixels.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Yinghai Lu <yhlu.kernel@...il.com>
Subject: Re: [PATCH] trim memory not covered by WB MTRRs

Jesse Barnes wrote:

> It looks like end_pfn might be ~0UL now... can you print that out in 
> your configuration?

Er, do you need the value of end_pfn ?
Here's what I changed:

if ((highest_addr >> PAGE_SHIFT) != end_pfn) {
         printk(KERN_WARNING "***************\n");
         printk(KERN_WARNING "**** WARNING: likely BIOS bug\n");
         printk(KERN_WARNING "**** MTRRs don't cover all of "
                "memory, trimmed %lu pages\n", end_pfn -
                (highest_addr >> PAGE_SHIFT));
         printk(KERN_WARNING "**** end_pfn before = %lu\n", end_pfn);
         end_pfn = highest_addr >> PAGE_SHIFT;
         printk(KERN_WARNING "**** end_pfn after = %lu\n", end_pfn);
         printk(KERN_WARNING "***************\n");
}

Here's the result:
***************
**** WARNING: likely BIOS bug
**** MTRRs don't cover all of memory, trimmed 18446744073709486080 pages
**** end_pfn before = 2293760
**** end_pfn after = 2359296
***************

Hope that's what you needed.
Pim

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