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[Xen-devel] Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction ab

To: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Subject: [Xen-devel] Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction abstraction
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date: Fri, 20 Jun 2008 13:16:00 -0700
Cc: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>, kvm-devel <kvm-devel@xxxxxxxxxxxxxxxxxxxxx>, benh@xxxxxxxxxxxxxxxxxxx, x86@xxxxxxxxxx, LKML <linux-kernel@xxxxxxxxxxxxxxx>, Virtualization Mailing List <virtualization@xxxxxxxxxxxxxx>, Hugh Dickins <hugh@xxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>
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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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