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A later commit will reduce the size of the RCU watching counter to free up some bits for another purpose. Paul suggested adding a config option to test the extreme case where the counter is reduced to its minimum usable width for rcutorture to poke at, so do that. Make it only configurable under RCU_EXPERT. While at it, add a comment to explain the layout of context_tracking->state. Link: http://lore.kernel.org/r/4c2cb573-168f-4806-b1d9-164e8276e66a@paulmck-laptop Suggested-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Valentin Schneider <vschneid@redhat.com> Reviewed-by: Paul E. McKenney <paulmck@kernel.org> Reviewed-by: Frederic Weisbecker <frederic@kernel.org> Signed-off-by: Frederic Weisbecker <frederic@kernel.org>