[PATCH tip/core/rcu 0/30] Miscellaneous fixes for v5.7

[Paul E. McKenney]

Hello!

This series provides miscellaneous fixes.

1.	Fix nfs_access_get_cached_rcu() sparse error, courtesy of
	Madhuparna Bhowmik.

2.	Warn on for_each_leaf_node_cpu_mask() from non-leaf rcu_node
	structure.

3.	Fix exp_funnel_lock()/rcu_exp_wait_wake() datarace.

4.	Provide debug symbols and line numbers in KCSAN runs.

5.	Add WRITE_ONCE() to rcu_node ->qsmask update.

6.	Add WRITE_ONCE to rcu_node ->exp_seq_rq store.

7.	Add READ_ONCE() to rcu_node ->gp_seq.

8.	Add WRITE_ONCE() to rcu_state ->gp_req_activity.

9.	Add WRITE_ONCE() to rcu_node ->qsmaskinitnext.

10.	Add WRITE_ONCE() to rt_mutex ->owner.

11.	Add READ_ONCE() to rcu_segcblist ->tails[].

12.	*_ONCE() for grace-period progress indicators.

13.	Fix typos in beginning comments, courtesy of SeongJae Park.

14.	Add READ_ONCE() to rcu_data ->gpwrap.

15.	Add *_ONCE() to rcu_data ->rcu_forced_tick.

16.	Add *_ONCE() to rcu_node ->boost_kthread_status.

17.	Use hlist_unhashed_lockless() in timer_pending(), courtesy of
	Eric Dumazet.

18.	Remove dead code from rcu_segcblist_insert_pend_cbs().

19.	Add WRITE_ONCE() to rcu_state ->gp_start.

20.	Fix rcu_barrier_callback() race condition.

21.	Add brackets around cond argument in __list_check_rcu macro,
	courtesy of Amol Grover.

22.	Don't flag non-starting GPs before GP kthread is running.

23.	Add missing annotation for rcu_nocb_bypass_lock(), courtesy
	of Jules Irenge.

24.	Add missing annotation for rcu_nocb_bypass_unlock(), courtesy
	of Jules Irenge.

25.	Optimize and protect atomic_cmpxchg() loop.

26.	Tighten rcu_lockdep_assert_cblist_protected() check.

27.	Make nocb_gp_wait() double-check unexpected-callback warning.

28.	Mark rcu_state.ncpus to detect concurrent writes.

29.	Mark rcu_state.gp_seq to detect concurrent writes.

30.	Make rcu_barrier() account for offline no-CBs CPUs.

							Thanx, Paul

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

 fs/nfs/dir.c               |    2 
 include/linux/rculist.h    |    4 -
 include/linux/timer.h      |    2 
 include/trace/events/rcu.h |    1 
 kernel/locking/rtmutex.c   |    2 
 kernel/rcu/Makefile        |    4 +
 kernel/rcu/rcu.h           |    6 +-
 kernel/rcu/rcu_segcblist.c |    4 -
 kernel/rcu/srcutree.c      |    2 
 kernel/rcu/tree.c          |  134 +++++++++++++++++++++++++--------------------
 kernel/rcu/tree_exp.h      |    4 -
 kernel/rcu/tree_plugin.h   |   21 ++++---
 kernel/rcu/tree_stall.h    |   41 +++++++------
 kernel/time/timer.c        |    7 +-
 14 files changed, 135 insertions(+), 99 deletions(-)