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Because SRCU-lite is being replaced by SRCU-fast, this commit removes support for SRCU-lite from rcutorture.c Both SRCU-lite and SRCU-fast provide faster readers by dropping the smp_mb() call from their lock and unlock primitives, but incur a pair of added RCU grace periods during the SRCU grace period. There is a trivial mapping from the SRCU-lite API to that of SRCU-fast, so there should be no transition issues. [ paulmck: Apply Christoph Hellwig feedback. ] Signed-off-by: "Paul E. McKenney" <paulmck@kernel.org> Signed-off-by: Neeraj Upadhyay (AMD) <neeraj.upadhyay@kernel.org>