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Message-ID: <4E98AF09.6040306@zytor.com>
Date: Fri, 14 Oct 2011 14:52:09 -0700
From: "H. Peter Anvin" <hpa@...or.com>
To: Jeremy Fitzhardinge <jeremy@...p.org>
CC: Steven Rostedt <rostedt@...dmis.org>,
"David S. Miller" <davem@...emloft.net>,
David Daney <david.daney@...ium.com>,
Michael Ellerman <michael@...erman.id.au>,
Jan Glauber <jang@...ux.vnet.ibm.com>,
Jason Baron <jbaron@...hat.com>,
the arch/x86 maintainers <x86@...nel.org>,
Xen Devel <xen-devel@...ts.xensource.com>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Ingo Molnar <mingo@...e.hu>,
Peter Zijlstra <peterz@...radead.org>,
Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Subject: Re: [PATCH RFC V4 09/10] x86/jump_label: use GENERIC_NOP5_ATOMIC
instead of jmp5 +0
On 10/13/2011 09:50 AM, Jeremy Fitzhardinge wrote:
> On 10/13/2011 08:40 AM, H. Peter Anvin wrote:
>> On 10/12/2011 05:08 PM, Jeremy Fitzhardinge wrote:
>>> From: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
>>>
>>> GENERIC_NOP5_ATOMIC should make a better nop.
>>>
>> On 32 bits, yes. On 64 bits you should use P6_NOP5_ATOMIC.
>
> So the cleanest way of fixing that is to make the GENERIC_NOP* be
> defined to P6_NOP* on 64-bit then? Assuming I'm correct in guessing
> that the intent of GENERIC_NOP* is "a basically good-enough NOP that
> will work on any x86".
>
No, GENERIC_NOPs are not valid on 64 bits at all.
-hpa
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