[PATCH tip/core/rcu 0/10] Expedited grace-period updates for v5.6

[Paul E. McKenney]

Hello!

This series provides updates to RCU's expedited grace periods:

1.	Use *_ONCE() to protect lockless ->expmask accesses.

2.	Avoid modifying mask_ofl_ipi in sync_rcu_exp_select_node_cpus(),
	courtesy of Boqun Feng.

3.	Fix data-race due to atomic_t copy-by-value, courtesy of
	Marco Elver.

4.	Lookup instead of bit-twiddling in sync_rcu_exp_select_node_cpus().

5.	Fix missed wakeup of exp_wq waiters, courtesy of Neeraj Upadhyay.

6.	Allow only one expedited GP to run concurrently with wakeups,
	courtesy of Neeraj Upadhyay.

7.	Rename sync_rcu_preempt_exp_done() to sync_rcu_exp_done().

8.	Update tree_exp.h function-header comments.

9.	Replace synchronize_sched_expedited_wait() "_sched" with "_rcu".

10.	Enable tick for nohz_full CPUs slow to provide expedited QS.

							Thanx, Paul

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

 include/linux/tick.h       |    5 +
 include/trace/events/rcu.h |    4 -
 kernel/rcu/tree.c          |   11 +--
 kernel/rcu/tree.h          |    1 
 kernel/rcu/tree_exp.h      |  149 +++++++++++++++++++++++++++------------------
 kernel/rcu/tree_plugin.h   |    4 -
 6 files changed, 107 insertions(+), 67 deletions(-)