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

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Date:	Fri, 03 Jul 2009 13:00:52 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	lkml@...ethan.org
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

Michael S. Zick wrote:
> On Fri July 3 2009, H. Peter Anvin wrote:
>> Jeremy Fitzhardinge wrote:
>>> Hm, well that does sound serious, but I think you're barking up the
>>> wrong tree with this particular patch.
>>>
>> Well, if it changes behavior it's an indication that the version of gas
>> he's using is broken (or possibly very old.)  What version is it?
>>
> 
> Whatever Gentoo was shipping with 4.1 - -
> System and operator are down for lunch at the moment -
> I'll look it up and reply soonest.
> 
> Scroll back up to my first post - it does make a difference
> with this tool-chain - exactly difference expected if the
> tool chain is doing 32-bit calculations.
> 
> And since it is a "*.S" file - I think cpp is doing it not gas/as.
> 

You're wrong.  cpp will expand the constants, but as will actually do
the calculation.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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