[PATCH] ARM: debugging smp_send_stop

[Peter De Schrijver]

Change-Id: Ia4f33b054f2eccf173a3d977686e1577e2146b92
---
 arch/arm/kernel/smp.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index 3e43c5f..e0e5eea 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -570,6 +570,7 @@ void smp_send_reschedule(int cpu)
 void smp_send_stop(void)
 {
 	unsigned long timeout;
+	int cpu = smp_processor_id();
 
 	if (num_online_cpus() > 1) {
 		cpumask_t mask = cpu_online_map;
@@ -583,8 +584,12 @@ void smp_send_stop(void)
 	while (num_online_cpus() > 1 && timeout--)
 		udelay(1);
 
-	if (num_online_cpus() > 1)
+	if (num_online_cpus() > 1) {
+		char cpu_mask[10];
 		pr_warning("SMP: failed to stop secondary CPUs\n");
+		cpumask_scnprintf(cpu_mask, sizeof(cpu_mask), cpu_online_mask);
+		pr_warn("running on CPU: %d, still online: %d, mask: %s\n", cpu, num_online_cpus(), cpu_mask);
+	}
 }
 
 /*
-- 
1.7.7.rc0.72.g4b5ea.dirty


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