linux-kernel - rt_mutex based ww

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Date:	Fri, 27 Feb 2015 17:57:06 +0100
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	linux-kernel@...r.kernel.org
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Maarten Lankhorst <maarten.lankhorst@...onical.com>
Subject: rt_mutex based ww_mutex implementation

On -RT we use struct rt_mutex instead of struct mutex for a regular "mutex".
And since people use GPUs there, too we needed a port of ww_mutex based
rtmutex. I snipped the implementaton out of -RT tried to fit on mainline
and not breaking too much. It doesn't look that bad now :)
#1 is here to keep the changes in #2 a little smaller.

Not sure if #3 makes sense without #2 but it looks like this has been
forgotten.

Sebastian

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