Re: [RT WARNING] DEBUG_LOCKS_WARN_ON(rt_mutex_owner(lock) != current) with fsfreeze (4.19.25-rt16)

From: Peter Zijlstra
Date: Wed May 01 2019 - 15:25:49 EST

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.