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rcu: RCU_FAST_NO_HZ detection of callback adoption
In the present implementations of CPU hotplug, the outgoing CPU is guaranteed to run its stop-machine process on the way out, which will guarantee that RCU_FAST_NO_HZ forces the CPU out of dyntick-idle mode. However, new versions of CPU hotplug might not work this way. This commit therefore removes this design constraint by explicitly notifying CPUs when they adopt non-lazy RCU callbacks. Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Tested-by: Heiko Carstens <heiko.carstens@de.ibm.com> Tested-by: Pascal Chapperon <pascal.chapperon@wanadoo.fr>
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@ -1397,6 +1397,8 @@ static void rcu_adopt_orphan_cbs(struct rcu_state *rsp)
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rdp->qlen_lazy += rsp->qlen_lazy;
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rdp->qlen += rsp->qlen;
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rdp->n_cbs_adopted += rsp->qlen;
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if (rsp->qlen_lazy != rsp->qlen)
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rcu_idle_count_callbacks_posted();
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rsp->qlen_lazy = 0;
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rsp->qlen = 0;
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