rcu: Dump local stack if cannot dump all CPUs' stacks

[pandora-kernel.git] / kernel / rcutree.c

diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index ebd18e5..a07bf55 100644 (file)
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -583,7 +583,8 @@ static void print_other_cpu_stall(struct rcu_state *rsp)
        }
        printk("} (detected by %d, t=%ld jiffies)\n",
               smp_processor_id(), (long)(jiffies - rsp->gp_start));
-       trigger_all_cpu_backtrace();
+       if (!trigger_all_cpu_backtrace())
+               dump_stack();
 
        /* If so configured, complain about tasks blocking the grace period. */
 
@@ -604,7 +605,8 @@ static void print_cpu_stall(struct rcu_state *rsp)
         */
        printk(KERN_ERR "INFO: %s detected stall on CPU %d (t=%lu jiffies)\n",
               rsp->name, smp_processor_id(), jiffies - rsp->gp_start);
-       trigger_all_cpu_backtrace();
+       if (!trigger_all_cpu_backtrace())
+               dump_stack();
 
        raw_spin_lock_irqsave(&rnp->lock, flags);
        if (ULONG_CMP_GE(jiffies, rsp->jiffies_stall))