X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=kernel%2Fsoftlockup.c;h=11df812263c8fd3eed16f4f1a57d36a68f6eaedc;hb=de0c74e7f98d8a06b784e120103eb388da8194f6;hp=68f7606b4160f9246e7b7c015ec7cd56477f5352;hpb=a3b13c23f186ecb57204580cc1f2dbe9c284953a;p=linux-2.6

diff --git a/kernel/softlockup.c b/kernel/softlockup.c
index 68f7606b41..11df812263 100644
--- a/kernel/softlockup.c
+++ b/kernel/softlockup.c
@@ -15,13 +15,16 @@
 #include <linux/notifier.h>
 #include <linux/module.h>
 
+#include <asm/irq_regs.h>
+
 static DEFINE_SPINLOCK(print_lock);
 
 static DEFINE_PER_CPU(unsigned long, touch_timestamp);
 static DEFINE_PER_CPU(unsigned long, print_timestamp);
 static DEFINE_PER_CPU(struct task_struct *, watchdog_task);
 
-static int did_panic = 0;
+static int did_panic;
+int softlockup_thresh = 10;
 
 static int
 softlock_panic(struct notifier_block *this, unsigned long event, void *ptr)
@@ -72,6 +75,7 @@ void softlockup_tick(void)
 	int this_cpu = smp_processor_id();
 	unsigned long touch_timestamp = per_cpu(touch_timestamp, this_cpu);
 	unsigned long print_timestamp;
+	struct pt_regs *regs = get_irq_regs();
 	unsigned long now;
 
 	if (touch_timestamp == 0) {
@@ -82,10 +86,11 @@ void softlockup_tick(void)
 	print_timestamp = per_cpu(print_timestamp, this_cpu);
 
 	/* report at most once a second */
-	if (print_timestamp < (touch_timestamp + 1) ||
-		did_panic ||
-			!per_cpu(watchdog_task, this_cpu))
+	if ((print_timestamp >= touch_timestamp &&
+			print_timestamp < (touch_timestamp + 1)) ||
+			did_panic || !per_cpu(watchdog_task, this_cpu)) {
 		return;
+	}
 
 	/* do not print during early bootup: */
 	if (unlikely(system_state != SYSTEM_RUNNING)) {
@@ -100,21 +105,26 @@ void softlockup_tick(void)
 		wake_up_process(per_cpu(watchdog_task, this_cpu));
 
 	/* Warn about unreasonable 10+ seconds delays: */
-	if (now > (touch_timestamp + 10)) {
-		per_cpu(print_timestamp, this_cpu) = touch_timestamp;
+	if (now <= (touch_timestamp + softlockup_thresh))
+		return;
+
+	per_cpu(print_timestamp, this_cpu) = touch_timestamp;
 
-		spin_lock(&print_lock);
-		printk(KERN_ERR "BUG: soft lockup detected on CPU#%d!\n",
-			this_cpu);
+	spin_lock(&print_lock);
+	printk(KERN_ERR "BUG: soft lockup - CPU#%d stuck for %lus! [%s:%d]\n",
+			this_cpu, now - touch_timestamp,
+			current->comm, task_pid_nr(current));
+	if (regs)
+		show_regs(regs);
+	else
 		dump_stack();
-		spin_unlock(&print_lock);
-	}
+	spin_unlock(&print_lock);
 }
 
 /*
  * The watchdog thread - runs every second and touches the timestamp.
  */
-static int watchdog(void * __bind_cpu)
+static int watchdog(void *__bind_cpu)
 {
 	struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 };
 
@@ -152,13 +162,13 @@ cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu)
 		BUG_ON(per_cpu(watchdog_task, hotcpu));
 		p = kthread_create(watchdog, hcpu, "watchdog/%d", hotcpu);
 		if (IS_ERR(p)) {
-			printk("watchdog for %i failed\n", hotcpu);
+			printk(KERN_ERR "watchdog for %i failed\n", hotcpu);
 			return NOTIFY_BAD;
 		}
-  		per_cpu(touch_timestamp, hotcpu) = 0;
-  		per_cpu(watchdog_task, hotcpu) = p;
+		per_cpu(touch_timestamp, hotcpu) = 0;
+		per_cpu(watchdog_task, hotcpu) = p;
 		kthread_bind(p, hotcpu);
- 		break;
+		break;
 	case CPU_ONLINE:
 	case CPU_ONLINE_FROZEN:
 		wake_up_process(per_cpu(watchdog_task, hotcpu));
@@ -178,7 +188,7 @@ cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu)
 		kthread_stop(p);
 		break;
 #endif /* CONFIG_HOTPLUG_CPU */
- 	}
+	}
 	return NOTIFY_OK;
 }