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Message-ID: <4682982B.8060200@macroscoop.nl>
Date: Wed, 27 Jun 2007 19:02:35 +0200
From: Pim Zandbergen <P.Zandbergen@macroscoop.nl>
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To: Jesse Barnes <jesse.barnes@intel.com>
CC: Mauro Giachero <mauro.giachero@gmail.com>, linux-kernel@vger.kernel.org,
       akpm@linux-foundation.org, Andi Kleen <andi@firstfloor.org>,
       Justin Piszcz <jpiszcz@lucidpixels.com>,
       "Eric W. Biederman" <ebiederm@xmission.com>,
       Yinghai Lu <yhlu.kernel@gmail.com>
Subject: Re: [PATCH] trim memory not covered by WB MTRRs
References: <200706251434.43863.jesse.barnes@intel.com> <200706270804.53263.jesse.barnes@intel.com> <468289A1.3080709@macroscoop.nl> <200706270922.05801.jesse.barnes@intel.com>
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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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