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rcutorture: Ignore attempts to test preemption and forward progress
Use of the rcutorture preempt_duration and the default-on fwd_progress kernel parameters can result in preemption of callback processing during forward-progress testing, which is an excellent way to OOM your test if your kernel offloads RCU callbacks. This commit therefore treats preempt_duration in the same way as stall_cpu in CONFIG_RCU_NOCB_CPU=y kernels, prohibiting fwd_progress testing and splatting when rcutorture is built in (as opposed to being a loadable module). Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
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