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

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Message-ID: <54FD7EFF.90105@linutronix.de>
Date:	Mon, 09 Mar 2015 12:07:43 +0100
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	Mike Galbraith <umgwanakikbuti@...il.com>
CC:	Maarten Lankhorst <maarten.lankhorst@...onical.com>,
	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

On 03/09/2015 11:51 AM, Mike Galbraith wrote:
> Why do both mutex and rtmutex then exist one might ask? ;-)  No big deal
> either way though, it's not like it becomes immutable once applied.

You don't choose rtmutex afaik. rtmutex is used by futex (only?) and
one of the things it does is PI.
On -RT we need PI everywhere therefore we s/mutex/rtmutex/.

> 
> 	-Mike

Sebastian

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