diff options
| -rw-r--r-- | include/linux/clockchips.h | 5 | ||||
| -rw-r--r-- | kernel/time/Kconfig | 4 | ||||
| -rw-r--r-- | kernel/time/tick-broadcast.c | 13 |
3 files changed, 22 insertions, 0 deletions
diff --git a/include/linux/clockchips.h b/include/linux/clockchips.h index e1089aa..6634652 100644 --- a/include/linux/clockchips.h +++ b/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 diff --git a/kernel/time/Kconfig b/kernel/time/Kconfig index 8601f0d..b696922 100644 --- a/kernel/time/Kconfig +++ b/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 diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c index 7cc81c5..f726537 100644 --- a/kernel/time/tick-broadcast.c +++ b/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; |
