linux-kernel - Re: [PATCH RFC 3/6] Use %gs as the PDA base-segment in the kernel.

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Message-ID: <44F326CA.9040206@zytor.com>
Date:	Mon, 28 Aug 2006 10:24:26 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andi Kleen <ak@...e.de>
CC:	Jeremy Fitzhardinge <jeremy@...p.org>,
	linux-kernel@...r.kernel.org,
	Chuck Ebbert <76306.1226@...puserve.com>,
	Zachary Amsden <zach@...are.com>,
	Jan Beulich <jbeulich@...ell.com>,
	Andrew Morton <akpm@...l.org>
Subject: Re: [PATCH RFC 3/6] Use %gs as the PDA base-segment in the kernel.

Andi Kleen wrote:
> On Sunday 27 August 2006 19:20, Jeremy Fitzhardinge wrote:
>> Andi Kleen wrote:
>>>> +1:	movw GS(%esp), %gs
>>>>     
>>> movl is recommended in 32bit mode
>>>   
>> arch/i386/kernel/entry.S: Assembler messages:
>> arch/i386/kernel/entry.S:334: Error: suffix or operands invalid for `mov'
> 
> Looks like a gas bug to me.
> 

Not so much a bug as a misfeature.  They changed the meaning of "movw" 
and "movl" on segment registers between versions.

Either way, just "mov" should work.

	-hpa

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