From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753509AbbCBIrK (ORCPT ); Mon, 2 Mar 2015 03:47:10 -0500 Received: from youngberry.canonical.com ([91.189.89.112]:45402 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750872AbbCBIrE (ORCPT ); Mon, 2 Mar 2015 03:47:04 -0500 Message-ID: <54F4237B.40903@canonical.com> Date: Mon, 02 Mar 2015 09:46:51 +0100 From: Maarten Lankhorst User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.4.0 MIME-Version: 1.0 To: Mike Galbraith , Sebastian Andrzej Siewior CC: linux-kernel@vger.kernel.org, Peter Zijlstra , Ingo Molnar Subject: Re: [PATCH 2/3] locking: ww_mutex: Allow to use rt_mutex instead of mutex for the baselock References: <1425056229-22326-1-git-send-email-bigeasy@linutronix.de> <1425056229-22326-3-git-send-email-bigeasy@linutronix.de> <1425266436.7429.8.camel@gmail.com> In-Reply-To: <1425266436.7429.8.camel@gmail.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hey, Op 02-03-15 om 04:20 schreef Mike Galbraith: > On Fri, 2015-02-27 at 17:57 +0100, Sebastian Andrzej Siewior wrote: >> This patch makes it possible to replace the base mutex by a rt_mutex. In >> general one would not do this. > I would argue that the thing should be born as a full fledged primitive, > not a config option, as an rt_ww_mutex is the ww extension of rt_mutex. > We have to do the global substitution in -rt, but why should it not > exist in its own right in mainline? Well I haven't seen any users that specifically need a rt_ww_mutex, but flipping the switch on ww_mutex could be useful for testing. :) ~Maarten