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Re: [PATCH v2 tip/core/rcu 04/39] srcu: Check for tardy grace-period activity in cleanup_srcu_struct()

From Josh Triplett <josh@joshtriplett.org>
Newsgroups linux.kernel
Subject Re: [PATCH v2 tip/core/rcu 04/39] srcu: Check for tardy grace-period activity in cleanup_srcu_struct()
Date 2017-04-18 21:50 +0200
Message-ID <txHip-1Gh-9@gated-at.bofh.it> (permalink)
References <txoz7-789-5@gated-at.bofh.it> <txoIP-7c0-41@gated-at.bofh.it> <txplv-7EF-5@gated-at.bofh.it> <txplv-7EF-3@gated-at.bofh.it> <txGcF-140-7@gated-at.bofh.it>
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On Tue, Apr 18, 2017 at 11:34:53AM -0700, Paul E. McKenney wrote:
> On Mon, Apr 17, 2017 at 05:34:30PM -0700, Josh Triplett wrote:
> > On Mon, Apr 17, 2017 at 05:33:32PM -0700, Josh Triplett wrote:
> > > On Mon, Apr 17, 2017 at 04:44:51PM -0700, Paul E. McKenney wrote:
> > > > Users of SRCU are obliged to complete all grace-period activity before
> > > > invoking cleanup_srcu_struct().  This means that all calls to either
> > > > synchronize_srcu() or synchronize_srcu_expedited() must have returned,
> > > > and all calls to call_srcu() must have returned, and the last call to
> > > > call_srcu() must have been followed by a call to srcu_barrier().
> > > > Furthermore, the caller must have done something to prevent any
> > > > further calls to synchronize_srcu(), synchronize_srcu_expedited(),
> > > > and call_srcu().
> > > > 
> > > > Therefore, if there has ever been an invocation of call_srcu() on
> > > > the srcu_struct in question, the sequence of events must be as
> > > > follows:
> > > > 
> > > > 1.  Prevent any further calls to call_srcu().
> > > > 2.  Wait for any pre-existing call_srcu() invocations to return.
> > > > 3.  Invoke srcu_barrier().
> > > > 4.  It is now safe to invoke cleanup_srcu_struct().
> > > > 
> > > > On the other hand, if there has ever been a call to synchronize_srcu()
> > > > or synchronize_srcu_expedited(), the sequence of events must be as
> > > > follows:
> > > > 
> > > > 1.  Prevent any further calls to synchronize_srcu() or
> > > >     synchronize_srcu_expedited().
> > > > 2.  Wait for any pre-existing synchronize_srcu() or
> > > >     synchronize_srcu_expedited() invocations to return.
> > > > 3.  It is now safe to invoke cleanup_srcu_struct().
> > > > 
> > > > If there have been calls to all both types of functions (call_srcu()
> > > > and either of synchronize_srcu() and synchronize_srcu_expedited()), then
> > > > the caller must do the first three steps of the call_srcu() procedure
> > > > above and the first two steps of the synchronize_s*() procedure above,
> > > > and only then invoke cleanup_srcu_struct().
> > > 
> > > This commit message clearly explains the correct sequence for the
> > > client, but not which aspects of this the change now enforces.  Some of
> > > the steps above remain the responsibility of the caller, while the
> > > callee now checks more of them.  Could you add something at the end
> > > explaining the change and what it enforces?
> > 
> > More importantly, perhaps this explanation could find its way into the
> > documentation of cleanup_srcu_struct?
> 
> Like this?
> 
> /**
>  * cleanup_srcu_struct - deconstruct a sleep-RCU structure
>  * @sp: structure to clean up.
>  *
>  * Must invoke this only after you are finished using a given srcu_struct
>  * that was initialized via init_srcu_struct().  This code does some
>  * probabalistic checking, spotting late uses of srcu_read_lock(),
>  * synchronize_srcu(), synchronize_srcu_expedited(), and call_srcu().
>  * If any such late uses are detected, the per-CPU memory associated with
>  * the srcu_struct is simply leaked and WARN_ON() is invoked.  If the
>  * caller frees the srcu_struct itself, a use-after-free crash will likely
>  * ensue, but at least there will be a warning printed.
>  */
> 
> I added the following paragraph to the commit log:
> 
> 	Note that cleanup_srcu_struct() does some probabilistic checks
> 	for the caller failing to follow these procedures, in which
> 	case cleanup_srcu_struct() does WARN_ON() and avoids freeing
> 	the per-CPU structures associated with the specified srcu_struct
> 	structure.
> 
> And added your Reviewed-by, but please let me if more is needed.

Looks good to me, thanks for improving the documentation.

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Thread

[PATCH tip/core/rcu 0/40] SRCU callback parallelization for 4.12 "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-12 19:50 +0200
  [PATCH tip/core/rcu 03/40] srcu: Consolidate batch checking into rcu_all_batches_empty() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-12 20:00 +0200
  [PATCH tip/core/rcu 05/40] rcu: Semicolon inside RCU_TRACE() for rcu.h "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-12 20:00 +0200
  [PATCH tip/core/rcu 11/40] rcu: Pull rcu_sched_qs_mask into rcu_dynticks structure "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-12 20:00 +0200
  Re: [PATCH tip/core/rcu 40/40] srcu: Parallelize callback handling Peter Zijlstra <peterz@infradead.org> - 2017-04-13 12:00 +0200
    Re: [PATCH tip/core/rcu 40/40] srcu: Parallelize callback handling "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-13 18:40 +0200
      Re: [PATCH tip/core/rcu 40/40] srcu: Parallelize callback handling "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-13 19:50 +0200
  Re: [PATCH tip/core/rcu 40/40] srcu: Parallelize callback handling Peter Zijlstra <peterz@infradead.org> - 2017-04-13 12:00 +0200
    Re: [PATCH tip/core/rcu 40/40] srcu: Parallelize callback handling "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-13 19:00 +0200
  [PATCH v2 tip/core/rcu 0/40] SRCU callback parallelization for 4.12 "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:50 +0200
    [PATCH v2 tip/core/rcu 02/39] rcu: Make arch select smp_mb__after_unlock_lock() strength "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:50 +0200
      Re: [PATCH v2 tip/core/rcu 02/39] rcu: Make arch select  smp_mb__after_unlock_lock() strength Josh Triplett <josh@joshtriplett.org> - 2017-04-18 02:20 +0200
    [PATCH v2 tip/core/rcu 10/39] rcu: Eliminate flavor scan in rcu_momentary_dyntick_idle() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:50 +0200
    [PATCH v2 tip/core/rcu 24/39] srcu: Move combining-tree definitions for SRCU's benefit "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:50 +0200
    [PATCH v2 tip/core/rcu 31/39] srcu: Allow a second bit in rcu_seq for SRCU state "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:50 +0200
    [PATCH v2 tip/core/rcu 15/39] srcu: Allow early boot use of synchronize_srcu() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:50 +0200
    [PATCH v2 tip/core/rcu 14/39] srcu: Allow SRCU to access rcu_scheduler_active "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:50 +0200
    [PATCH v2 tip/core/rcu 05/39] rcu: Semicolon inside RCU_TRACE() for rcu.h "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:50 +0200
    [PATCH v2 tip/core/rcu 33/39] srcu: Crude control of expedited grace periods "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:50 +0200
    [PATCH v2 tip/core/rcu 29/39] srcu: Fix bogus try_check_zero() comment "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:50 +0200
    [PATCH v2 tip/core/rcu 25/39] srcu: Move rcu_init_levelspread() to rcu_tree_node.h "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:50 +0200
    [PATCH v2 tip/core/rcu 27/39] srcu: Move rcu_node traversal macros to rcu.h "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:50 +0200
    [PATCH v2 tip/core/rcu 06/39] rcu: Semicolon inside RCU_TRACE() for Tiny RCU "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:50 +0200
    [PATCH v2 tip/core/rcu 39/39] rcu: Make non-preemptive schedule be Tasks RCU quiescent state "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:50 +0200
    [PATCH v2 tip/core/rcu 07/39] rcu: Semicolon inside RCU_TRACE() for tree.c "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:50 +0200
    [PATCH v2 tip/core/rcu 18/39] rcu: Expedited wakeups need to be fully ordered "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:50 +0200
    [PATCH v2 tip/core/rcu 21/39] srcu: Move to state-based grace-period sequencing "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:50 +0200
    [PATCH v2 tip/core/rcu 22/39] srcu: Add grace-period sequence numbers "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:50 +0200
    [PATCH v2 tip/core/rcu 34/39] mm: Use static initialization for "srcu" "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:50 +0200
    [PATCH v2 tip/core/rcu 35/39] srcu: Create a tiny SRCU "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:50 +0200
    [PATCH v2 tip/core/rcu 16/39] rcu: Add single-element dequeue functions to rcu_segcblist "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:50 +0200
    [PATCH v2 tip/core/rcu 19/39] rcu: Fix warning in rcu_seq_end() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 02:00 +0200
    [PATCH v2 tip/core/rcu 03/39] srcu: Consolidate batch checking into rcu_all_batches_empty() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 02:00 +0200
      Re: [PATCH v2 tip/core/rcu 03/39] srcu: Consolidate batch checking  into rcu_all_batches_empty() Josh Triplett <josh@joshtriplett.org> - 2017-04-18 02:40 +0200
    [PATCH v2 tip/core/rcu 08/39] rcu: Pull rcu_sched_qs_mask into rcu_dynticks structure "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 02:00 +0200
    [PATCH v2 tip/core/rcu 09/39] rcu: Pull rcu_qs_ctr into rcu_dynticks structure "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 02:00 +0200
    [PATCH v2 tip/core/rcu 30/39] srcu: Improve rcu_seq grace-period-counter abstraction "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 02:00 +0200
    [PATCH v2 tip/core/rcu 17/39] srcu: Move rcu_seq_start() and friends to rcu.h "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 02:00 +0200
    [PATCH v2 tip/core/rcu 11/39] rcu: Place guard on rcu_all_qs() and rcu_note_context_switch() actions "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 02:00 +0200
    [PATCH v2 tip/core/rcu 28/39] srcu: Make num_rcu_lvl[] array be external "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 02:00 +0200
    [PATCH v2 tip/core/rcu 26/39] rcu: Remove redundant levelcnt[] array from rcu_init_one() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 02:00 +0200
    [PATCH v2 tip/core/rcu 32/39] srcu: Merge ->srcu_state into ->srcu_gp_seq "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 02:00 +0200
    [PATCH v2 tip/core/rcu 36/39] srcutorture: Print Tiny SRCU reader statistics "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 02:00 +0200
    [PATCH v2 tip/core/rcu 01/39] rcu: Maintain special bits at bottom of ->dynticks counter "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 02:00 +0200
      Re: [PATCH v2 tip/core/rcu 01/39] rcu: Maintain special bits at  bottom of ->dynticks counter Josh Triplett <josh@joshtriplett.org> - 2017-04-18 02:10 +0200
        Re: [PATCH v2 tip/core/rcu 01/39] rcu: Maintain special bits at  bottom of ->dynticks counter "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 20:30 +0200
    [PATCH v2 tip/core/rcu 04/39] srcu: Check for tardy grace-period activity in cleanup_srcu_struct() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 02:00 +0200
      Re: [PATCH v2 tip/core/rcu 04/39] srcu: Check for tardy grace-period  activity in cleanup_srcu_struct() Josh Triplett <josh@joshtriplett.org> - 2017-04-18 02:40 +0200
        Re: [PATCH v2 tip/core/rcu 04/39] srcu: Check for tardy grace-period  activity in cleanup_srcu_struct() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 20:40 +0200
          Re: [PATCH v2 tip/core/rcu 04/39] srcu: Check for tardy grace-period  activity in cleanup_srcu_struct() Josh Triplett <josh@joshtriplett.org> - 2017-04-18 21:50 +0200
      Re: [PATCH v2 tip/core/rcu 04/39] srcu: Check for tardy grace-period  activity in cleanup_srcu_struct() Josh Triplett <josh@joshtriplett.org> - 2017-04-18 02:40 +0200
    [PATCH v3 tip/core/rcu 0/40] SRCU callback parallelization for 4.12 "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:00 +0200
      [PATCH v3 tip/core/rcu 35/40] srcu: Create a tiny SRCU "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:00 +0200
      [PATCH v3 tip/core/rcu 12/40] rcu: Default RCU_FANOUT_LEAF to 16 unless explicitly changed "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:00 +0200
      [PATCH v3 tip/core/rcu 05/40] rcu: Semicolon inside RCU_TRACE() for rcu.h "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
        Re: [PATCH v3 tip/core/rcu 05/40] rcu: Semicolon inside RCU_TRACE()  for rcu.h Joe Perches <joe@perches.com> - 2017-04-19 19:50 +0200
      [PATCH v3 tip/core/rcu 26/40] rcu: Remove redundant levelcnt[] array from rcu_init_one() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
      [PATCH v3 tip/core/rcu 14/40] srcu: Allow SRCU to access rcu_scheduler_active "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
      [PATCH v3 tip/core/rcu 27/40] srcu: Move rcu_node traversal macros to rcu.h "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
      [PATCH v3 tip/core/rcu 19/40] rcu: Fix warning in rcu_seq_end() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
      [PATCH v3 tip/core/rcu 29/40] srcu: Fix bogus try_check_zero() comment "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
      [PATCH v3 tip/core/rcu 28/40] srcu: Make num_rcu_lvl[] array be external "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
      [PATCH v3 tip/core/rcu 22/40] srcu: Add grace-period sequence numbers "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
      [PATCH v3 tip/core/rcu 39/40] srcu: Expedite srcu_schedule_cbs_snp() callback invocation "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
      [PATCH v3 tip/core/rcu 30/40] srcu: Improve rcu_seq grace-period-counter abstraction "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
      [PATCH v3 tip/core/rcu 01/40] rcu: Maintain special bits at bottom of ->dynticks counter "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
      [PATCH v3 tip/core/rcu 20/40] srcu: Push srcu_advance_batches() fastpath into common case "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
      [PATCH v3 tip/core/rcu 34/40] mm: Use static initialization for "srcu" "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
      [PATCH v3 tip/core/rcu 17/40] srcu: Move rcu_seq_start() and friends to rcu.h "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
      [PATCH v3 tip/core/rcu 08/40] rcu: Pull rcu_sched_qs_mask into rcu_dynticks structure "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
      [PATCH v3 tip/core/rcu 36/40] srcutorture: Print Tiny SRCU reader statistics "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
      [PATCH v3 tip/core/rcu 09/40] rcu: Pull rcu_qs_ctr into rcu_dynticks structure "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
      [PATCH v3 tip/core/rcu 04/40] srcu: Check for tardy grace-period activity in cleanup_srcu_struct() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
      [PATCH v3 tip/core/rcu 07/40] rcu: Semicolon inside RCU_TRACE() for tree.c "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
      [PATCH v3 tip/core/rcu 10/40] rcu: Eliminate flavor scan in rcu_momentary_dyntick_idle() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
      [PATCH v3 tip/core/rcu 02/40] rcu: Make arch select smp_mb__after_unlock_lock() strength "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
      [PATCH v3 tip/core/rcu 24/40] srcu: Move combining-tree definitions for SRCU's benefit "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
      [PATCH v3 tip/core/rcu 15/40] srcu: Allow early boot use of synchronize_srcu() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
      [PATCH v3 tip/core/rcu 33/40] srcu: Crude control of expedited grace periods "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
      [PATCH v3 tip/core/rcu 06/40] rcu: Semicolon inside RCU_TRACE() for Tiny RCU "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
      [PATCH v3 tip/core/rcu 03/40] srcu: Consolidate batch checking into rcu_all_batches_empty() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
      [PATCH v3 tip/core/rcu 32/40] srcu: Merge ->srcu_state into ->srcu_gp_seq "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
      [PATCH v3 tip/core/rcu 25/40] srcu: Move rcu_init_levelspread() to rcu_tree_node.h "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
  powerpc KVM build break in linux-next (was Re: [PATCH tip/core/rcu 40/40] srcu: Parallelize callback handling) Michael Ellerman <michaele@au1.ibm.com> - 2017-04-20 05:50 +0200
    Re: powerpc KVM build break in linux-next (was Re: [PATCH  tip/core/rcu 40/40] srcu: Parallelize callback handling) "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-20 16:30 +0200
    Re: powerpc KVM build break in linux-next (was Re: [PATCH  tip/core/rcu 40/40] srcu: Parallelize callback handling) Paolo Bonzini <pbonzini@redhat.com> - 2017-04-20 17:30 +0200
      Re: powerpc KVM build break in linux-next (was Re: [PATCH  tip/core/rcu 40/40] srcu: Parallelize callback handling) "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-21 02:40 +0200
        Re: powerpc KVM build break in linux-next (was Re: [PATCH tip/core/rcu 40/40] srcu: Parallelize callback handling) Michael Ellerman <michaele@au1.ibm.com> - 2017-04-21 03:50 +0200
          Re: powerpc KVM build break in linux-next (was Re: [PATCH  tip/core/rcu 40/40] srcu: Parallelize callback handling) "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-21 06:20 +0200
            Re: powerpc KVM build break in linux-next (was Re: [PATCH  tip/core/rcu 40/40] srcu: Parallelize callback handling) Paolo Bonzini <pbonzini@redhat.com> - 2017-04-21 09:30 +0200
              Re: powerpc KVM build break in linux-next (was Re: [PATCH  tip/core/rcu 40/40] srcu: Parallelize callback handling) "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-21 15:00 +0200
                Re: powerpc KVM build break in linux-next (was Re: [PATCH tip/core/rcu 40/40] srcu: Parallelize callback handling) Michael Ellerman <michaele@au1.ibm.com> - 2017-04-22 08:20 +0200
      Re: powerpc KVM build break in linux-next (was Re: [PATCH tip/core/rcu 40/40] srcu: Parallelize callback handling) Michael Ellerman <michaele@au1.ibm.com> - 2017-04-21 04:20 +0200

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