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-rw-r--r--kernel/rcutree.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index c45d3f7..be76c80 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -1505,6 +1505,9 @@ static void rcu_cleanup_dead_cpu(int cpu, struct rcu_state *rsp)
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);
+ init_callback_list(rdp);
+ /* Disallow further callbacks on this CPU. */
+ rdp->nxttail[RCU_NEXT_TAIL] = NULL;
}
#else /* #ifdef CONFIG_HOTPLUG_CPU */
@@ -1927,6 +1930,12 @@ __call_rcu(struct rcu_head *head, void (*func)(struct rcu_head *rcu),
rdp = this_cpu_ptr(rsp->rda);
/* Add the callback to our list. */
+ if (unlikely(rdp->nxttail[RCU_NEXT_TAIL] == NULL)) {
+ /* _call_rcu() is illegal on offline CPU; leak the callback. */
+ WARN_ON_ONCE(1);
+ local_irq_restore(flags);
+ return;
+ }
ACCESS_ONCE(rdp->qlen)++;
if (lazy)
rdp->qlen_lazy++;
@@ -2464,6 +2473,7 @@ rcu_init_percpu_data(int cpu, struct rcu_state *rsp, int preemptible)
rdp->qlen_last_fqs_check = 0;
rdp->n_force_qs_snap = rsp->n_force_qs;
rdp->blimit = blimit;
+ init_callback_list(rdp); /* Re-enable callbacks on this CPU. */
rdp->dynticks->dynticks_nesting = DYNTICK_TASK_EXIT_IDLE;
atomic_set(&rdp->dynticks->dynticks,
(atomic_read(&rdp->dynticks->dynticks) & ~0x1) + 1);
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