Merge tag 'scftorture.2026.08.18a' of git://git.kernel.org/pub/scm/linux/kernel/git/rcu/linux

Pull smp_call_function() torture-test updates from Paul McKenney:

 - Count single_rpc offline failures in statistics output

 - Make invoker threads actually wait for all threads to start

* tag 'scftorture.2026.08.18a' of git://git.kernel.org/pub/scm/linux/kernel/git/rcu/linux:
  scftorture: Make invoker threads actually wait for all threads to start
  scftorture: Count single_rpc offline failures in statistics output