Merge branches 'doc.2020.06.29a', 'fixes.2020.06.29a', 'kfree_rcu.2020.06.29a', ...

doc.2020.06.29a:  Documentation updates.
fixes.2020.06.29a:  Miscellaneous fixes.
kfree_rcu.2020.06.29a:  kfree_rcu() updates.
rcu-tasks.2020.06.29a:  RCU Tasks updates.
scale.2020.06.29a:  Read-side scalability tests.
srcu.2020.06.29a:  SRCU updates.
torture.2020.06.29a:  Torture-test updates.

diff --cc Documentation/admin-guide/kernel-parameters.txt
Simple merge

diff --cc include/trace/events/rcu.h
Simple merge

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

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

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

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

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

diff --cc tools/testing/selftests/rcutorture/bin/kvm.sh
Simple merge

diff --cc tools/testing/selftests/rcutorture/bin/parse-console.sh
Simple merge