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In order to extend locktorture to support lock nesting, add nested_lock() and nested_unlock() hooks to the torture ops. These take a 32bit lockset mask which is generated at random, so some number of locks will be taken before the main lock is taken and released afterwards. Additionally, add nested_locks module parameter to allow specifying the number of nested locks to be used. This has been helpful to uncover issues in the proxy-exec series development. This was inspired by locktorture extensions originally implemented by Connor O'Brien, for stress testing the proxy-execution series: https://lore.kernel.org/lkml/20221003214501.2050087-12-connoro@google.com/ Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: "Paul E. McKenney" <paulmck@kernel.org> Cc: Josh Triplett <josh@joshtriplett.org> Cc: Joel Fernandes <joel@joelfernandes.org> Cc: Juri Lelli <juri.lelli@redhat.com> Cc: Valentin Schneider <vschneid@redhat.com> Cc: Dietmar Eggemann <dietmar.eggemann@arm.com> Cc: kernel-team@android.com Reviewed-by: Davidlohr Bueso <dave@stgolabs.net> Co-developed-by: Connor O'Brien <connoro@google.com> Signed-off-by: Connor O'Brien <connoro@google.com> Signed-off-by: John Stultz <jstultz@google.com> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>