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The deferred quiescent states resulting from the consolidation of RCU-bh and RCU-sched into RCU means that rcu_read_unlock() will no longer attempt to acquire scheduler locks if interrupts were disabled across that call to rcu_read_unlock(). The cautions in the rcu_read_unlock() header comment are therefore obsolete. This commit therefore removes them. Signed-off-by: Paul E. McKenney <paulmck@kernel.org>