[PATCH tip/core/rcu 0/11] Preemptible-RCU updates for v5.6

["Paul E. McKenney" <paulmck@kernel.org>]

Hello!

This series contains preemptible-RCU updates for v5.6:

1.	Fix dump_tree hierarchy print always active, courtesy of
	Stefan Reiter.

2.	Avoid data-race in rcu_gp_fqs_check_wake(), courtesy of Eric
	Dumazet.

3.	Use lockdep rather than comment to enforce lock held.

4.	Make PREEMPT_RCU be a modifier to TREE_RCU, courtesy of
	Lai Jiangshan.

5.	Use CONFIG_PREEMPTION where appropriate, courtesy of Sebastian
	Andrzej Siewior.

6.	Rename some instances of CONFIG_PREEMPTION to CONFIG_PREEMPT_RCU,
	courtesy of Lai Jiangshan.

7.	Clear .exp_hint only when deferred quiescent state has been
	reported, courtesy of Lai Jiangshan.

8.	Clear ->rcu_read_unlock_special only once, courtesy of Lai
	Jiangshan.

9.	Use READ_ONCE() for ->expmask in rcu_read_unlock_special().

10.	Provide wrappers for uses of ->rcu_read_lock_nesting, courtesy
	of Lai Jiangshan.

11.	Avoid tick_dep_set_cpu() misordering.

							Thanx, Paul

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

 include/linux/rcupdate.h   |    8 +--
 include/trace/events/rcu.h |    4 -
 kernel/rcu/Kconfig         |   17 +++---
 kernel/rcu/Makefile        |    1 
 kernel/rcu/rcu.h           |    2 
 kernel/rcu/rcutorture.c    |    2 
 kernel/rcu/srcutiny.c      |    2 
 kernel/rcu/tree.c          |   20 ++++---
 kernel/rcu/tree_exp.h      |    6 +-
 kernel/rcu/tree_plugin.h   |  118 +++++++++++++++++++++++++--------------------
 kernel/rcu/tree_stall.h    |    6 +-
 kernel/rcu/update.c        |    2 
 kernel/sysctl.c            |    2 
 13 files changed, 105 insertions(+), 85 deletions(-)