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

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Date:	Mon, 09 Mar 2015 12:29:12 +0100
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
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 Mon, 2015-03-09 at 12:07 +0100, Sebastian Andrzej Siewior wrote:
> 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?)

Almost only, but not quite.

drivers/media/usb/em28xx/em28xx.h:      struct rt_mutex i2c_bus_lock;
include/linux/i2c.h:    struct rt_mutex bus_lock;
kernel/rcu/tree.h:      struct rt_mutex boost_mtx;

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