From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1753131AbcAVK5L (ORCPT <rfc822;w@1wt.eu>);
	Fri, 22 Jan 2016 05:57:11 -0500
Received: from casper.infradead.org ([85.118.1.10]:33121 "EHLO
	casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1752729AbcAVK46 (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Fri, 22 Jan 2016 05:56:58 -0500
Date: Fri, 22 Jan 2016 11:56:52 +0100
From: Peter Zijlstra <peterz@infradead.org>
To: Jason Low <jason.low2@hp.com>
Cc: Waiman Long <waiman.long@hpe.com>, Ding Tianhong <dingtianhong@huawei.com>,
        Ingo Molnar <mingo@redhat.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Davidlohr Bueso <dave@stgolabs.net>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        "Paul E. McKenney" <paulmck@us.ibm.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Will Deacon <Will.Deacon@arm.com>,
        Tim Chen <tim.c.chen@linux.intel.com>,
        Waiman Long <Waiman.Long@hp.com>
Subject: Re: [PATCH RFC] locking/mutexes: don't spin on owner when wait list
 is not NULL.
Message-ID: <20160122105652.GE6375@twins.programming.kicks-ass.net>
References: <56A0A4ED.3070308@huawei.com>
 <56A1638A.7050202@hpe.com>
 <20160122085422.GO6357@twins.programming.kicks-ass.net>
 <1453458019.9727.8.camel@j-VirtualBox>
 <20160122105312.GQ6357@twins.programming.kicks-ass.net>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20160122105312.GQ6357@twins.programming.kicks-ass.net>
User-Agent: Mutt/1.5.21 (2012-12-30)
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Fri, Jan 22, 2016 at 11:53:12AM +0100, Peter Zijlstra wrote:

> There might be other details, but this is the one that stood out.

I think this also does the wrong thing for use_ww_ctx.