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rcu: Prevent early boot set_need_resched() from __rcu_pending()
There isn't a whole lot of point in poking the scheduler before there are other tasks to switch to. This commit therefore adds a check for rcu_scheduler_fully_active in __rcu_pending() to suppress any pre-scheduler calls to set_need_resched(). The downside of this approach is additional runtime overhead in a reasonably hot code path. 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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1 changed files with 2 additions and 1 deletions
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@ -1707,7 +1707,8 @@ static int __rcu_pending(struct rcu_state *rsp, struct rcu_data *rdp)
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check_cpu_stall(rsp, rdp);
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/* Is the RCU core waiting for a quiescent state from this CPU? */
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if (rdp->qs_pending && !rdp->passed_quiesce) {
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if (rcu_scheduler_fully_active &&
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rdp->qs_pending && !rdp->passed_quiesce) {
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/*
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* If force_quiescent_state() coming soon and this CPU
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