linux-kernel - Re: [PATCH 2/3] locking: ww_mutex: Allow to use rt

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Message-ID: <54F4237B.40903@canonical.com>
Date:	Mon, 02 Mar 2015 09:46:51 +0100
From:	Maarten Lankhorst <maarten.lankhorst@...onical.com>
To:	Mike Galbraith <umgwanakikbuti@...il.com>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
CC:	linux-kernel@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH 2/3] locking: ww_mutex: Allow to use rt_mutex instead
 of mutex for the baselock

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
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