rcu: Avoid spurious RCU CPU stall warnings
If a given CPU avoids the idle loop but also avoids starting a new RCU grace period for a full minute, RCU can issue spurious RCU CPU stall warnings. This commit fixes this issue by adding a check for ongoing grace period to avoid these spurious stall warnings. Reported-by: Becky Bruce <bgillbruce@gmail.com> Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
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@ -819,7 +819,8 @@ static void check_cpu_stall(struct rcu_state *rsp, struct rcu_data *rdp)
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j = ACCESS_ONCE(jiffies);
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j = ACCESS_ONCE(jiffies);
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js = ACCESS_ONCE(rsp->jiffies_stall);
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js = ACCESS_ONCE(rsp->jiffies_stall);
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rnp = rdp->mynode;
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rnp = rdp->mynode;
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if ((ACCESS_ONCE(rnp->qsmask) & rdp->grpmask) && ULONG_CMP_GE(j, js)) {
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if (rcu_gp_in_progress(rsp) &&
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(ACCESS_ONCE(rnp->qsmask) & rdp->grpmask) && ULONG_CMP_GE(j, js)) {
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/* We haven't checked in, so go dump stack. */
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/* We haven't checked in, so go dump stack. */
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print_cpu_stall(rsp);
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print_cpu_stall(rsp);
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