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rcutorture: Call preempt_schedule() through static call/key
The rcutorture test suite sometimess triggers a random scheduler preemption call while simulating a read delay. Unfortunately, its direct call to preempt_schedule() bypasses the static call/key filter used by CONFIG_PREEMPT_DYNAMIC. This breaks the no-preempt assumption when the dynamic preemption mode is "none". For example, rcu_blocking_is_gp() is fooled and abbreviates grace periods when the CPU runs in no-preempt UP mode. Fix this by making torture_preempt_schedule() call __preempt_schedule(), which uses the static call/key. Reported-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Frederic Weisbecker <frederic@kernel.org> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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@ -118,7 +118,7 @@ void _torture_stop_kthread(char *m, struct task_struct **tp);
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_torture_stop_kthread("Stopping " #n " task", &(tp))
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#ifdef CONFIG_PREEMPTION
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#define torture_preempt_schedule() preempt_schedule()
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#define torture_preempt_schedule() __preempt_schedule()
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#else
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#define torture_preempt_schedule() do { } while (0)
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#endif
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