linux-kernel - Re: [Bug Fix]: Do 32-bit table calculations in pre-processor

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Message-Id: <200907031538.11603.lkml@morethan.org>
Date:	Fri, 3 Jul 2009 15:38:07 -0500
From:	"Michael S. Zick" <lkml@...ethan.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	the arch/x86 maintainers <x86@...nel.org>,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [Bug Fix]: Do 32-bit table calculations in pre-processor

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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