diff options
| author | Paul E. McKenney <paul.mckenney@linaro.org> | 2012-06-21 20:26:42 +0200 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2012-07-02 21:34:25 +0200 |
| commit | cf01537ecf192d9ff15c32a355db5d5af22bea4d (patch) | |
| tree | 5561d7852d1a4dc88d706863f6c95256c783e9f4 /kernel/rcutree.c | |
| parent | rcu: Disable preemption in rcu_blocking_is_gp() (diff) | |
| download | linux-cf01537ecf192d9ff15c32a355db5d5af22bea4d.tar.xz linux-cf01537ecf192d9ff15c32a355db5d5af22bea4d.zip | |
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/rcutree.c')
| -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 */ |