linux-kernel - Re: [PATCH] x86 : spinlock use LOCK

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Message-ID: <48A5E69E.7060003@zytor.com>
Date:	Fri, 15 Aug 2008 13:27:10 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Ingo Molnar <mingo@...e.hu>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Harvey Harrison <harvey.harrison@...il.com>,
	Andi Kleen <andi@...stfloor.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Steven Rostedt <srostedt@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Miller <davem@...emloft.net>,
	Roland McGrath <roland@...hat.com>,
	Ulrich Drepper <drepper@...hat.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Gregory Haskins <ghaskins@...ell.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	"Luis Claudio R. Goncalves" <lclaudio@...g.org>,
	Clark Williams <williams@...hat.com>,
	Christoph Lameter <cl@...ux-foundation.org>
Subject: Re: [PATCH] x86 : spinlock use LOCK_PREFIX

Linus Torvalds wrote:
> 
> On Fri, 15 Aug 2008, Mathieu Desnoyers wrote:
>> Unless there a rationale for this, I think these be changed to LOCK_PREFIX
>> too.
>>
>> grep "lock ;" include/asm-x86/spinlock.h
>>          "lock ; cmpxchgw %w1,%2\n\t"
>>   asm volatile("lock ; xaddl %0, %1\n"
>>          "lock ; cmpxchgl %1,%2\n\t"
> 
> Ack.
> 

Full patch series applied to tip:x86/alternatives; we'll migrate it to 
tip:x86/urgent for upstream delivery after some testing.

	-hpa
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