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Comments in wait-type checks be improved by mentioning the PREEPT_RT kernel configure option. Signed-off-by: Zhouyi Zhou <zhouzhouyi@gmail.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Paul E. McKenney <paulmck@kernel.org> Link: https://lkml.kernel.org/r/20210811025920.20751-1-zhouzhouyi@gmail.com