Merge branch 'core-rcu.2021.08.28a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu

Pull RCU updates from Paul McKenney:
 "RCU changes for this cycle were:

   - Documentation updates

   - Miscellaneous fixes

   - Offloaded-callbacks updates

   - Updates to the nolibc library

   - Tasks-RCU updates

   - In-kernel torture-test updates

   - Torture-test scripting, perhaps most notably the pinning of
     torture-test guest OSes so as to force differences in memory
     latency. For example, in a two-socket system, a four-CPU guest OS
     will have one pair of its CPUs pinned to threads in a single core
     on one socket and the other pair pinned to threads in a single core
     on the other socket. This approach proved able to force race
     conditions that earlier testing missed. Some of these race
     conditions are still being tracked down"

* 'core-rcu.2021.08.28a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu: (61 commits)
  torture: Replace deprecated CPU-hotplug functions.
  rcu: Replace deprecated CPU-hotplug functions
  rcu: Print human-readable message for schedule() in RCU reader
  rcu: Explain why rcu_all_qs() is a stub in preemptible TREE RCU
  rcu: Use per_cpu_ptr to get the pointer of per_cpu variable
  rcu: Remove useless "ret" update in rcu_gp_fqs_loop()
  rcu: Mark accesses in tree_stall.h
  rcu: Make rcu_gp_init() and rcu_gp_fqs_loop noinline to conserve stack
  rcu: Mark lockless ->qsmask read in rcu_check_boost_fail()
  srcutiny: Mark read-side data races
  rcu: Start timing stall repetitions after warning complete
  rcu: Do not disable GP stall detection in rcu_cpu_stall_reset()
  rcu/tree: Handle VM stoppage in stall detection
  rculist: Unify documentation about missing list_empty_rcu()
  rcu: Mark accesses to ->rcu_read_lock_nesting
  rcu: Weaken ->dynticks accesses and updates
  rcu: Remove special bit at the bottom of the ->dynticks counter
  rcu: Fix stall-warning deadlock due to non-release of rcu_node ->lock
  rcu: Fix to include first blocked task in stall warning
  torture: Make kvm-test-1-run-qemu.sh check for reboot loops
  ...

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