linux-kernel - Re: [PATCH 1 of 4] mm: add a ptep_modify

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Date:	Fri, 20 Jun 2008 13:16:00 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Ingo Molnar <mingo@...e.hu>, benh@...nel.crashing.org,
	xen-devel <xen-devel@...ts.xensource.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	kvm-devel <kvm-devel@...ts.sourceforge.net>, x86@...nel.org,
	LKML <linux-kernel@...r.kernel.org>,
	Virtualization Mailing List <virtualization@...ts.osdl.org>,
	Hugh Dickins <hugh@...itas.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction abstraction

Linus Torvalds wrote:
> On Fri, 20 Jun 2008, Ingo Molnar wrote:
>   
>> okay - Jeremy, could you try the fix below? (or tip/master, i just 
>> pushed this out)
>>     
>
> Actually, don't try that one.
>
> It needs to be a _byte_ registers, so "ir" was wrong. You need "iq".
>   

Doesn't work, unfortunately:
{standard input}:20511: Error: Incorrect register `%eax' used with `b' 
suffix

        lock; orb %eax,1(%rdi)  # tmp64,

    J
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