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[PATCH tip/core/rcu 0/7] Miscellaneous fixes for 4.10

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Hello!

This series contains miscellaneous fixes to RCU:

1.	Tighten up __call_rcu's alignment check for the rcu_head structure
	now that no arch does two-byte alignment of pointers.

2.	Remove obsolete comment about when rcu_check_callbacks() was invoked.

3.	Remove obsolete comment about which function opportunistically
	notes grace periods beginnings and endings.

4.	Update the RCU_TRACE Kconfig option's help text to note that
	it enables event tracing in addition to debugfs, courtesy of
	Nikolay Borisov.

5.	Add event tracing for long read-side delays in rcutorture
	in order to better debug too-short grace periods.

6.	Make expedited grace periods recheck dyntick-idle state to avoid
	sending needless IPIs.

7.	Don't kick CPUs unless there is grace-period activity currently
	in progress.

							Thanx, Paul

------------------------------------------------------------------------

 include/trace/events/rcu.h |    5 ++++-
 kernel/rcu/rcutorture.c    |   11 ++++++++++-
 kernel/rcu/tree.c          |   17 ++++++-----------
 kernel/rcu/tree.h          |    1 +
 kernel/rcu/tree_exp.h      |   12 +++++++++++-
 lib/Kconfig.debug          |    3 ++-
 6 files changed, 34 insertions(+), 15 deletions(-)

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[PATCH tip/core/rcu 0/7] Miscellaneous fixes for 4.10 "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-11-14 18:00 +0100
  [PATCH tip/core/rcu 3/7] rcu: Remove obsolete comment from __call_rcu() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-11-14 18:00 +0100
  [PATCH tip/core/rcu 2/7] rcu: Remove obsolete rcu_check_callbacks() header comment "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-11-14 18:00 +0100
  [PATCH tip/core/rcu 4/7] rcu: RCU_TRACE enables event tracing as well as debugfs "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-11-14 18:00 +0100
  [PATCH tip/core/rcu 7/7] rcu: Don't kick unless grace period or request "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-11-14 18:00 +0100
  [PATCH tip/core/rcu 1/7] rcu: Tighten up __call_rcu() rcu_head alignment check "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-11-14 18:00 +0100
  [PATCH tip/core/rcu 6/7] rcu: Make expedited grace periods recheck dyntick idle state "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-11-14 18:00 +0100
    Re: [PATCH tip/core/rcu 6/7] rcu: Make expedited grace periods  recheck dyntick idle state Josh Triplett <josh@joshtriplett.org> - 2016-11-14 18:30 +0100
      Re: [PATCH tip/core/rcu 6/7] rcu: Make expedited grace periods  recheck dyntick idle state Peter Zijlstra <peterz@infradead.org> - 2016-11-14 18:40 +0100
        Re: [PATCH tip/core/rcu 6/7] rcu: Make expedited grace periods  recheck dyntick idle state "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-11-14 19:20 +0100
          Re: [PATCH tip/core/rcu 6/7] rcu: Make expedited grace periods  recheck dyntick idle state Peter Zijlstra <peterz@infradead.org> - 2016-11-15 09:20 +0100
            Re: [PATCH tip/core/rcu 6/7] rcu: Make expedited grace periods  recheck dyntick idle state "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-11-15 15:40 +0100
  [PATCH tip/core/rcu 5/7] torture: Trace long read-side delays "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-11-14 18:00 +0100
    Re: [PATCH tip/core/rcu 5/7] torture: Trace long read-side delays Josh Triplett <josh@joshtriplett.org> - 2016-11-14 18:30 +0100
      Re: [PATCH tip/core/rcu 5/7] torture: Trace long read-side delays "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-11-14 19:50 +0100
        Re: [PATCH tip/core/rcu 5/7] torture: Trace long read-side delays Josh Triplett <josh@joshtriplett.org> - 2016-11-14 20:00 +0100
  Re: [PATCH tip/core/rcu 0/7] Miscellaneous fixes for 4.10 Josh Triplett <josh@joshtriplett.org> - 2016-11-14 18:30 +0100

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