Merge tag 'rcu-urgent.2022.01.26a' of git://git.kernel.org/pub/scm/linux/kernel/git...

Merge tag 'rcu-urgent.2022.01.26a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu

Pull RCU fix from Paul McKenney:
 "This fixes a brown-paper-bag bug in RCU tasks that causes things like
  BPF and ftrace to fail miserably on systems with non-power-of-two
  numbers of CPUs.

  It fixes a math error added in 64ab37b73402 ("rcu-tasks: Introduce
  ->percpu_enqueue_shift for dynamic queue selection') during the v5.17
  merge window. This commit works correctly only on systems with a
  power-of-two number of CPUs, which just so happens to be the kind that
  rcutorture always uses by default.

  This pull request fixes the math so that things also work on systems
  that don't happen to have a power-of-two number of CPUs"

* tag 'rcu-urgent.2022.01.26a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu:
  rcu-tasks: Fix computation of CPU-to-list shift counts