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9855c37edf
This reverts commit28319d6dc5. The race it fixed was subject to conditions that don't exist anymore since:1612160b91("rcu-tasks: Eliminate deadlocks involving do_exit() and RCU tasks") This latter commit removes the use of SRCU that used to cover the RCU-tasks blind spot on exit between the tasklist's removal and the final preemption disabling. The task is now placed instead into a temporary list inside which voluntary sleeps are accounted as RCU-tasks quiescent states. This would disarm the deadlock initially reported against PID namespace exit. Signed-off-by: Frederic Weisbecker <frederic@kernel.org> Reviewed-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>