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nocb: Remove show_rcu_nocb_state() false positive printout

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The rcu_data structure's ->nocb_timer field is used to defer wakeups of
the corresponding no-CBs CPU's grace-period kthread ("rcuog*"), and that
structure's ->nocb_defer_wakeup field is used to track such deferral.
This means that the show_rcu_nocb_state() printing an error when those
fields are set for a CPU not corresponding to a no-CBs grace-period
kthread is erroneous.

This commit therefore switches the check from ->nocb_timer to
->nocb_bypass_timer and removes the check of ->nocb_defer_wakeup.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney 2020-06-22 16:46:43 -07:00
parent 9b1ce0acb5
commit 2130c6b4f6
1 changed files with 2 additions and 3 deletions
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5
kernel/rcu/tree_plugin.h
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@ -2411,10 +2411,9 @@ static void show_rcu_nocb_state(struct rcu_data *rdp)
return;
waslocked = raw_spin_is_locked(&rdp->nocb_gp_lock);
wastimer = timer_pending(&rdp->nocb_timer);
wastimer = timer_pending(&rdp->nocb_bypass_timer);
wassleep = swait_active(&rdp->nocb_gp_wq);
if (!rdp->nocb_defer_wakeup && !rdp->nocb_gp_sleep &&
!waslocked && !wastimer && !wassleep)
if (!rdp->nocb_gp_sleep && !waslocked && !wastimer && !wassleep)
return; /* Nothing untowards. */
pr_info(" nocb GP activity on CB-only CPU!!! %c%c%c%c %c\n",