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Date:   Wed, 1 May 2019 21:25:25 +0200
From:   Peter Zijlstra <peterz@infradead.org>
To:     Davidlohr Bueso <dave@stgolabs.net>
Cc:     Waiman Long <longman@redhat.com>,
        Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
        linux-rt-users <linux-rt-users@vger.kernel.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Daniel Bristot de Oliveira <bristot@redhat.com>,
        Clark Williams <williams@redhat.com>,
        Juri Lelli <juri.lelli@redhat.com>,
        Oleg Nesterov <oleg@redhat.com>, jack@suse.com
Subject: Re: [RT WARNING] DEBUG_LOCKS_WARN_ON(rt_mutex_owner(lock) !=
 current) with fsfreeze (4.19.25-rt16)
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On Wed, May 01, 2019 at 12:22:34PM -0700, Davidlohr Bueso wrote:
> On Wed, 01 May 2019, Peter Zijlstra wrote:
> 
> > Nah, the percpu_rwsem abuse by the freezer is atrocious, we really
> > should not encourage that. Also, it completely wrecks -RT.
> > 
> > Hence the proposed patch.
> 
> Is this patch (and removing rcuwait) only intended for rt?

Seeing how we want to have -rt upstream, and how horrible that current
fixup is; I'm tempted to say that barring a better solution, we'd want
this upstream.