Merge branches 'doc.2019.10.29a', 'fixes.2019.10.30a', 'nohz.2019.10.28a', 'replace...

doc.2019.10.29a: RCU documentation updates.
fixes.2019.10.30a: RCU miscellaneous fixes.
nohz.2019.10.28a: RCU NO_HZ and NO_HZ_FULL updates.
replace.2019.10.30a: Replace rcu_swap_protected() with rcu_replace().
torture.2019.10.05a: RCU torture-test updates.

lkmm.2019.10.05a: Linux kernel memory model updates.

diff --cc kernel/rcu/rcu.h
Simple merge

diff --cc kernel/rcu/rcutorture.c
Simple merge

diff --cc kernel/rcu/tree.c
Simple merge