linux-kernel - Re: [PATCH v2 1/2] rtmutex Real-Time Linux: Fixing kernel BUG at kernel/locking/rtmutex.c:997!

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Date:	Tue, 07 Apr 2015 13:01:24 +0200
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Thavatchai Makphaibulchoke <tmac@...com>,
	linux-kernel@...r.kernel.org, mingo@...hat.com, tglx@...utronix.de,
	linux-rt-users@...r.kernel.org,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: Re: [PATCH v2 1/2] rtmutex Real-Time Linux: Fixing kernel BUG at
 kernel/locking/rtmutex.c:997!

On Tue, 2015-04-07 at 12:56 +0200, Peter Zijlstra wrote:
> On Tue, Apr 07, 2015 at 12:49:16PM +0200, Mike Galbraith wrote:
> > If you have a spot where it'd be nice to do that despite it being 
> > somewhat (koff).. discouraged shall we say, you have to do 
> > something 
> > funky.  Thomas had a patch to not raise sirq unconditionally for -
> > rt 
> > to let nohz_full work, but it needs a lock that's converted to an 
> > rtmutex in -rt, and which doesn't want to be un-converted.  Ergo, 
> > get 
> > funky.
> 
> I should probably back away slowly at this point.. but got a 
> reference
> to a thread that explains the 'problem'?

https://lkml.org/lkml/2015/4/6/434
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