linux-kernel - Re: [RFC PATCH 9/9] debugfs: free debugfs

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Date:   Tue, 18 Apr 2017 10:19:38 -0700
From:   "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:     Johannes Berg <johannes@...solutions.net>
Cc:     Nicolai Stange <nicstange@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 9/9] debugfs: free debugfs_fsdata instances

On Tue, Apr 18, 2017 at 05:20:38PM +0200, Johannes Berg wrote:
> On Tue, 2017-04-18 at 08:17 -0700, Paul E. McKenney wrote:
> 
> > > Again, no (S)RCU abuse here, just an ABBA deadlock.
> > 
> > OK, please accept my apologies for failing to follow the thread.
> 
> No worries - just wanted to clarify this in case I was missing
> something.
> 
> > I nevertheless reiterate my advice to run at least some tests with
> > CONFIG_PROVE_RCU=y.  And yes, it would be good to upgrade lockdep
> > to find the above theoretical deadlock.
> 
> Right. It won't matter for debugfs after this patchset, but it would
> indeed be nice - I failed in my attempt though :)

Hey, I was hoping!  ;-)

							Thanx, Paul