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rcu: Check for callback invocation from offline CPUs
Because quiescent states are now reported from offline CPUs in CPU_DYING state, there is some possibility that such a CPU might note the end of a grace period and attempt to start invoking callbacks. This would be a very bad thing, and is supposed to be prevented by the fact that the CPU_DYING CPU gets rid of all its callbacks before reporting the quiescent state. However, there is other CPU-offline code in the kernel, and it is quite possible that someone will invoke RCU core processing from that code. Therefore, this commit adds a warning for this case. Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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@ -1373,6 +1373,7 @@ static void rcu_do_batch(struct rcu_state *rsp, struct rcu_data *rdp)
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* races with call_rcu() from interrupt handlers.
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*/
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local_irq_save(flags);
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WARN_ON_ONCE(cpu_is_offline(smp_processor_id()));
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bl = rdp->blimit;
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trace_rcu_batch_start(rsp->name, rdp->qlen_lazy, rdp->qlen, bl);
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list = rdp->nxtlist;
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