From: "Michael S. Zick" <lkml@morethan.org>
Reply-To: lkml@morethan.org
To: "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [Bug Fix]: Do 32-bit table calculations in pre-processor
Date: Fri, 3 Jul 2009 15:38:07 -0500
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Cc: Jeremy Fitzhardinge <jeremy@goop.org>, linux-kernel@vger.kernel.org,
       Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>,
       the arch/x86 maintainers <x86@kernel.org>,
       Andi Kleen <ak@linux.intel.com>
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On Fri July 3 2009, H. Peter Anvin wrote:
> Michael S. Zick wrote:
> > 
> > Good point: (1<<(32-PAGE_SIFT)) would handle other than 4k pages.
> > 
> > I just hardcoded it as a working example of the change from setting
> > the page table size by design rather than numeric error.
> > 
> 
> As Jeremy pointed out, it's not wrong as written.  gas by design uses
> arbitrary-precision arithmetic, and even if it didn't, it would still be
> correct: (1 << 32) would collapse to 0, so all the rest of the
> calculations would still be right.
> 
> Any way you can dump out this value from the vmlinux file (nm vmlinux |
> grep MAPPING_BEYOND_END) in both cases?  
>

Can't find it in either case, or with objdump.

(g)as reports itself as version 2.18


> What version of as/binutils do 
> you have installed?
> 
> > And yes, it has 512Mbyte of ram, so 1/2Mbyte page table sounds right to me.
> 
> /proc/cpuinfo, please?
> 

That takes a running machine - which is a bit of a challenge at the moment.
Well, for the past four months, if truth be told.

Anything in particular you are looking for?
I may have it in my notes and data captures.

Mike
> 	-hpa
> 


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