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Diffstat (limited to 'kernel/rcutree.c')
-rw-r--r--kernel/rcutree.c13
1 files changed, 9 insertions, 4 deletions
diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index 9970116163ba..ade788320dd6 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -545,6 +545,7 @@ static void print_other_cpu_stall(struct rcu_state *rsp)
int cpu;
long delta;
unsigned long flags;
+ int ndetected;
struct rcu_node *rnp = rcu_get_root(rsp);
/* Only let one CPU complain about others per time interval. */
@@ -561,7 +562,7 @@ static void print_other_cpu_stall(struct rcu_state *rsp)
* Now rat on any tasks that got kicked up to the root rcu_node
* due to CPU offlining.
*/
- rcu_print_task_stall(rnp);
+ ndetected = rcu_print_task_stall(rnp);
raw_spin_unlock_irqrestore(&rnp->lock, flags);
/*
@@ -573,17 +574,21 @@ static void print_other_cpu_stall(struct rcu_state *rsp)
rsp->name);
rcu_for_each_leaf_node(rsp, rnp) {
raw_spin_lock_irqsave(&rnp->lock, flags);
- rcu_print_task_stall(rnp);
+ ndetected += rcu_print_task_stall(rnp);
raw_spin_unlock_irqrestore(&rnp->lock, flags);
if (rnp->qsmask == 0)
continue;
for (cpu = 0; cpu <= rnp->grphi - rnp->grplo; cpu++)
- if (rnp->qsmask & (1UL << cpu))
+ if (rnp->qsmask & (1UL << cpu)) {
printk(" %d", rnp->grplo + cpu);
+ ndetected++;
+ }
}
printk("} (detected by %d, t=%ld jiffies)\n",
smp_processor_id(), (long)(jiffies - rsp->gp_start));
- if (!trigger_all_cpu_backtrace())
+ if (ndetected == 0)
+ printk(KERN_ERR "INFO: Stall ended before state dump start\n");
+ else if (!trigger_all_cpu_backtrace())
dump_stack();
/* If so configured, complain about tasks blocking the grace period. */