---

yaml
---
r: 350156
b: refs/heads/master
c: 12ad100
h: refs/heads/master
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 12572dbb53638c6e454ef831c8fee7de3df24389
+refs/heads/master: 12ad10004645d38356b14d1fbba379c523a61916

trunk/include/linux/clockchips.h

@@ -162,6 +162,11 @@ extern void clockevents_suspend(void);
 extern void clockevents_resume(void);
 
 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
+#ifdef CONFIG_ARCH_HAS_TICK_BROADCAST
+extern void tick_broadcast(const struct cpumask *mask);
+#else
+#define tick_broadcast	NULL
+#endif
 extern int tick_receive_broadcast(void);
 #endif
 

trunk/kernel/time/Kconfig

@@ -38,6 +38,10 @@ config GENERIC_CLOCKEVENTS_BUILD
 	default y
 	depends on GENERIC_CLOCKEVENTS
 
+# Architecture can handle broadcast in a driver-agnostic way
+config ARCH_HAS_TICK_BROADCAST
+	bool
+
 # Clockevents broadcasting infrastructure
 config GENERIC_CLOCKEVENTS_BROADCAST
 	bool

trunk/kernel/time/tick-broadcast.c

@@ -18,6 +18,7 @@
 #include <linux/percpu.h>
 #include <linux/profile.h>
 #include <linux/sched.h>
+#include <linux/smp.h>
 
 #include "tick-internal.h"
 
@@ -86,6 +87,11 @@ int tick_is_broadcast_device(struct clock_event_device *dev)
 	return (dev && tick_broadcast_device.evtdev == dev);
 }
 
+static void err_broadcast(const struct cpumask *mask)
+{
+	pr_crit_once("Failed to broadcast timer tick. Some CPUs may be unresponsive.\n");
+}
+
 /*
  * Check, if the device is disfunctional and a place holder, which
  * needs to be handled by the broadcast device.
@@ -105,6 +111,13 @@ int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu)
 	 */
 	if (!tick_device_is_functional(dev)) {
 		dev->event_handler = tick_handle_periodic;
+		if (!dev->broadcast)
+			dev->broadcast = tick_broadcast;
+		if (!dev->broadcast) {
+			pr_warn_once("%s depends on broadcast, but no broadcast function available\n",
+				     dev->name);
+			dev->broadcast = err_broadcast;
+		}
 		cpumask_set_cpu(cpu, tick_get_broadcast_mask());
 		tick_broadcast_start_periodic(tick_broadcast_device.evtdev);
 		ret = 1;