[PATCH RFC tip/core/rcu 0/2] Fix RCU idle-exit problem and comment

[Paul E. McKenney]

Hello!

This series fixes a brown-paper-bag NMI self-deadlock bug located by
Thomas Gleixner and adds comments:

1.	Don't acquire lock in NMI handler in rcu_nmi_enter_common().

2.	Add comments marking transitions between RCU watching and not.

These pass light rcutorture testing, and seem like v5.8 material.

							Thanx, Paul

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 tree.c |   31 ++++++++++++++++++++++++++-----
 1 file changed, 26 insertions(+), 5 deletions(-)