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

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Message-ID: <1492528838.18845.3.camel@sipsolutions.net>
Date:   Tue, 18 Apr 2017 17:20:38 +0200
From:   Johannes Berg <johannes@...solutions.net>
To:     paulmck@...ux.vnet.ibm.com
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, 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 :)

johannes