[PATCH tip/core/rcu 0/26] Miscellaneous fixes for v5.9

[Paul E. McKenney]

Hello!

This series provides miscellaneous fixes:

1.	Initialize and destroy rcu_synchronize only when necessary,
	courtesy of Wei Yang.

2.	mm/mmap.c: Add cond_resched() for exit_mmap() CPU stalls.

3.	Simplify the calculation of rcu_state.ncpus, courtesy of Wei Yang.

4.	Add callbacks-invoked counters.

5.	Add comment documenting rcu_callback_map's purpose.

6.	events: rcu: Change description of rcu_dyntick trace event,
	courtesy of Madhuparna Bhowmik.

7.	Grace-period-kthread related sleeps to idle priority.

8.	Priority-boost-related sleeps to idle priority.

9.	No-CBs-related sleeps to idle priority.

10.	Expedited grace-period sleeps to idle priority.

11.	fs/btrfs: Add cond_resched() for try_release_extent_mapping()
	stalls.

12.	Update comment from rsp->rcu_gp_seq to rsp->gp_seq, courtesy
	of Lihao Liang.

13.	tick/nohz: Narrow down noise while setting current task's tick
	dependency, courtesy of Frederic Weisbecker.

14.	Fix some kernel-doc warnings, courtesy of Mauro Carvalho Chehab.

15.	Remove initialized but unused rnp from check_slow_task().

16.	Mark rcu_nmi_enter() call to rcu_cleanup_after_idle() noinstr.

17.	Complain only once about RCU in extended quiescent state.

18.	Replace 1 with true, courtesy of Jules Irenge.

19.	Stop shrinker loop, courtesy of Peter Enderborg.

20.	gp_max is protected by root rcu_node's lock, courtesy of Wei Yang.

21.	grplo/grphi just records CPU number, courtesy of Wei Yang.

22.	grpnum just records group number, courtesy of Wei Yang.

23.	kernel/rcu/tree.c: Fix kernel-doc warnings, courtesy of Randy
	Dunlap.

24.	Fix some kernel-doc warnings, courtesy of Mauro Carvalho Chehab.

25.	Remove KCSAN stubs.

26.	Remove KCSAN stubs from update.c.

							Thanx, Paul

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

 fs/btrfs/extent_io.c       |    2 ++
 include/linux/rculist.h    |    2 +-
 include/trace/events/rcu.h |   11 ++++++-----
 kernel/locking/lockdep.c   |    4 +---
 kernel/rcu/tree.c          |   39 +++++++++++++--------------------------
 kernel/rcu/tree.h          |   15 ++++++++-------
 kernel/rcu/tree_exp.h      |    2 +-
 kernel/rcu/tree_plugin.h   |    4 ++--
 kernel/rcu/tree_stall.h    |    5 +++--
 kernel/rcu/update.c        |   28 +++++++++-------------------
 kernel/time/tick-sched.c   |   22 +++++++++++++++-------
 mm/mmap.c                  |    1 +
 12 files changed, 62 insertions(+), 73 deletions(-)