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authorThomas Gleixner <tglx@linutronix.de>2014-02-03 23:34:31 +0100
committerThomas Gleixner <tglx@linutronix.de>2014-02-07 15:34:28 +0100
commit627ee7947e2e83ba565c31c5c9373d6e364b1ecd (patch)
tree30fc40a08542f0411e28ba9becc00e07f7ec3b44 /kernel/time/tick-internal.h
parenttimekeeping: Move clock sync work to power efficient workqueue (diff)
downloadlinux-627ee7947e2e83ba565c31c5c9373d6e364b1ecd.tar.xz
linux-627ee7947e2e83ba565c31c5c9373d6e364b1ecd.zip
clockevents: Serialize calls to clockevents_update_freq() in the core
We can identify the broadcast device in the core and serialize all callers including interrupts on a different CPU against the update. Also, disabling interrupts is moved into the core allowing callers to leave interrutps enabled when calling clockevents_update_freq(). Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com> Cc: linux-arm-kernel@lists.infradead.org Cc: Soeren Brinkmann <soren.brinkmann@xilinx.com> Cc: Daniel Lezcano <daniel.lezcano@linaro.org> Cc: Michal Simek <michal.simek@xilinx.com> Link: http://lkml.kernel.org/r/1391466877-28908-2-git-send-email-soren.brinkmann@xilinx.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/time/tick-internal.h')
-rw-r--r--kernel/time/tick-internal.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/time/tick-internal.h b/kernel/time/tick-internal.h
index 8329669b51ec..26f1c0ba9d81 100644
--- a/kernel/time/tick-internal.h
+++ b/kernel/time/tick-internal.h
@@ -111,6 +111,7 @@ extern int tick_resume_broadcast(void);
extern void tick_broadcast_init(void);
extern void
tick_set_periodic_handler(struct clock_event_device *dev, int broadcast);
+int tick_broadcast_update_freq(struct clock_event_device *dev, u32 freq);
#else /* !BROADCAST */
@@ -133,6 +134,8 @@ static inline void tick_shutdown_broadcast(unsigned int *cpup) { }
static inline void tick_suspend_broadcast(void) { }
static inline int tick_resume_broadcast(void) { return 0; }
static inline void tick_broadcast_init(void) { }
+static inline int tick_broadcast_update_freq(struct clock_event_device *dev,
+ u32 freq) { return -ENODEV; }
/*
* Set the periodic handler in non broadcast mode
@@ -154,5 +157,6 @@ static inline int tick_device_is_functional(struct clock_event_device *dev)
#endif
+int __clockevents_update_freq(struct clock_event_device *dev, u32 freq);
extern void do_timer(unsigned long ticks);
extern void update_wall_time(void);