Re: [RFC PATCH 9/9] debugfs: free debugfs_fsdata instances

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From	"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Newsgroups	linux.kernel
Subject	Re: [RFC PATCH 9/9] debugfs: free debugfs_fsdata instances
Date	Tue, 18 Apr 2017 19:20:01 +0200
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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

Thread

[RFC PATCH 0/9] debugfs: per-file removal protection Nicolai Stange <nicstange@gmail.com> - 2017-04-16 12:00 +0200
  [RFC PATCH 4/9] debugfs: convert to debugfs_file_get() and -put() Nicolai Stange <nicstange@gmail.com> - 2017-04-16 12:00 +0200
  [RFC PATCH 2/9] debugfs: implement per-file removal protection Nicolai Stange <nicstange@gmail.com> - 2017-04-16 12:00 +0200
  [RFC PATCH 5/9] IB/hfi1: convert to debugfs_file_get() and -put() Nicolai Stange <nicstange@gmail.com> - 2017-04-16 12:00 +0200
  [RFC PATCH 8/9] debugfs: defer debugfs_fsdata allocation to first usage Nicolai Stange <nicstange@gmail.com> - 2017-04-16 12:00 +0200
    Re: [RFC PATCH 8/9] debugfs: defer debugfs_fsdata allocation to  first usage Johannes Berg <johannes@sipsolutions.net> - 2017-04-18 11:40 +0200
  [RFC PATCH 6/9] debugfs: purge obsolete SRCU based removal protection Nicolai Stange <nicstange@gmail.com> - 2017-04-16 12:00 +0200
  [RFC PATCH 9/9] debugfs: free debugfs_fsdata instances Nicolai Stange <nicstange@gmail.com> - 2017-04-16 12:00 +0200
    Re: [RFC PATCH 9/9] debugfs: free debugfs_fsdata instances "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-17 18:10 +0200
      Re: [RFC PATCH 9/9] debugfs: free debugfs_fsdata instances Johannes Berg <johannes@sipsolutions.net> - 2017-04-18 11:50 +0200
        Re: [RFC PATCH 9/9] debugfs: free debugfs_fsdata instances "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 15:40 +0200
          Re: [RFC PATCH 9/9] debugfs: free debugfs_fsdata instances Johannes Berg <johannes@sipsolutions.net> - 2017-04-18 15:50 +0200
            Re: [RFC PATCH 9/9] debugfs: free debugfs_fsdata instances "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 17:20 +0200
              Re: [RFC PATCH 9/9] debugfs: free debugfs_fsdata instances Johannes Berg <johannes@sipsolutions.net> - 2017-04-18 17:30 +0200
                Re: [RFC PATCH 9/9] debugfs: free debugfs_fsdata instances "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 19:20 +0200
  [RFC PATCH 1/9] debugfs: add support for more elaborate ->d_fsdata Nicolai Stange <nicstange@gmail.com> - 2017-04-16 12:00 +0200
  [RFC PATCH 3/9] debugfs: debugfs_real_fops(): drop __must_hold sparse annotation Nicolai Stange <nicstange@gmail.com> - 2017-04-16 12:00 +0200
  [RFC PATCH 7/9] debugfs: call debugfs_real_fops() only after debugfs_file_get() Nicolai Stange <nicstange@gmail.com> - 2017-04-16 12:00 +0200

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