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| author | Paul E. McKenney <paul.mckenney@linaro.org> | 2012-06-21 11:26:42 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2012-07-02 12:34:25 -0700 |
| commit | cf01537ecf192d9ff15c32a355db5d5af22bea4d (patch) | |
| tree | 5561d7852d1a4dc88d706863f6c95256c783e9f4 /kernel | |
| parent | 95f0c1de3e6ed4383cc4b5f52ce4ecfb21026b49 (diff) | |
| download | linux-cf01537ecf192d9ff15c32a355db5d5af22bea4d.tar.bz2 | |
rcu: Add check for CPUs going offline with callbacks queued
If a CPU goes offline with callbacks queued, those callbacks might be
indefinitely postponed, which can result in a system hang. This commit
therefore inserts warnings for this condition.
Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/rcutree.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/rcutree.c b/kernel/rcutree.c index e000a623e635..95c7b61e77e4 100644 --- a/kernel/rcutree.c +++ b/kernel/rcutree.c @@ -1509,6 +1509,9 @@ static void rcu_cleanup_dead_cpu(int cpu, struct rcu_state *rsp) raw_spin_unlock_irqrestore(&rnp->lock, flags); if (need_report & RCU_OFL_TASKS_EXP_GP) rcu_report_exp_rnp(rsp, rnp, true); + WARN_ONCE(rdp->qlen != 0 || rdp->nxtlist != NULL, + "rcu_cleanup_dead_cpu: Callbacks on offline CPU %d: qlen=%lu, nxtlist=%p\n", + cpu, rdp->qlen, rdp->nxtlist); } #else /* #ifdef CONFIG_HOTPLUG_CPU */ |