[PATCH tip/core/rcu 0/4] Stall-warning updates for v5.12

[Paul E. McKenney]

Hello!

This series enhances RCU CPU stall-warning messages.

1.	Mark obtuse portion of stall warning as internal debug.

2.	For RCU grace-period kthread starvation, dump last CPU it ran on.

3.	Do not NMI offline CPUs.

4.	Check and report missed fqs timer wakeup on RCU stall, courtesy
	of Neeraj Upadhyay.

						Thanx, Paul

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

 Documentation/RCU/stallwarn.rst |   23 +++++++++++++++
 kernel/rcu/tree.c               |   25 ++++++++++-------
 kernel/rcu/tree_exp.h           |    2 -
 kernel/rcu/tree_stall.h         |   58 +++++++++++++++++++++++++++++++++++-----
 4 files changed, 90 insertions(+), 18 deletions(-)