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rcu: Avoid spurious RCU CPU stall warnings

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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>
This commit is contained in:
Paul E. McKenney 2012-08-13 11:17:06 -07:00 • committed by Paul E. McKenney
parent c8020a67e6
commit c96ea7cfdd
1 changed files with 2 additions and 1 deletions
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3
kernel/rcutree.c
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@ -819,7 +819,8 @@ static void check_cpu_stall(struct rcu_state *rsp, struct rcu_data *rdp)
j = ACCESS_ONCE(jiffies); j = ACCESS_ONCE(jiffies);
js = ACCESS_ONCE(rsp->jiffies_stall); js = ACCESS_ONCE(rsp->jiffies_stall);
rnp = rdp->mynode; rnp = rdp->mynode;
if ((ACCESS_ONCE(rnp->qsmask) & rdp->grpmask) && ULONG_CMP_GE(j, js)) { if (rcu_gp_in_progress(rsp) &&
(ACCESS_ONCE(rnp->qsmask) & rdp->grpmask) && ULONG_CMP_GE(j, js)) {
/* We haven't checked in, so go dump stack. */ /* We haven't checked in, so go dump stack. */
print_cpu_stall(rsp); print_cpu_stall(rsp);