Dear RCUers: When I study the function rcu_nocb_try_bypass, the only place it can be called is from function __call_rcu_common, and __call_rcu_common disable irq before call rcu_nocb_try_bypass, so, I assume when we enter rcu_nocb_try_bypass, there will be no context switch. In rcu_nocb_try_bypass, rcu_nocb_wait_contended got called, the purpose of rcu_nocb_wait_contended is "relying on the fact that at most two kthreads and one CPU contend for this lock". My question is: assume there will be no context switch, why will there be two kthreads competing for this CPU lock? I have stumbled on this question for more than a year. Thank you all in advance ;-) Best Regard Zhouyi
