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| author | Ingo Molnar <mingo@elte.hu> | 2007-04-07 12:05:00 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-04-07 10:03:43 -0700 |
| commit | 995f054f2a342f8505fed4f8395d12c0f5966414 (patch) | |
| tree | 08ddf96e3365d2b0a9940914fdb179810fbca3a0 | |
| parent | bbef618190fb484b28b7d441e6fc5d524027c4fa (diff) | |
| download | op-kernel-dev-995f054f2a342f8505fed4f8395d12c0f5966414.zip op-kernel-dev-995f054f2a342f8505fed4f8395d12c0f5966414.tar.gz | |
[PATCH] high-res timers: resume fix
Soeren Sonnenburg reported that upon resume he is getting
this backtrace:
[<c0119637>] smp_apic_timer_interrupt+0x57/0x90
[<c0142d30>] retrigger_next_event+0x0/0xb0
[<c0104d30>] apic_timer_interrupt+0x28/0x30
[<c0142d30>] retrigger_next_event+0x0/0xb0
[<c0140068>] __kfifo_put+0x8/0x90
[<c0130fe5>] on_each_cpu+0x35/0x60
[<c0143538>] clock_was_set+0x18/0x20
[<c0135cdc>] timekeeping_resume+0x7c/0xa0
[<c02aabe1>] __sysdev_resume+0x11/0x80
[<c02ab0c7>] sysdev_resume+0x47/0x80
[<c02b0b05>] device_power_up+0x5/0x10
it turns out that on resume we mistakenly re-enable interrupts too
early. Do the timer retrigger only on the current CPU.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Soeren Sonnenburg <kernel@nn7.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | include/linux/hrtimer.h | 3 | ||||
| -rw-r--r-- | kernel/hrtimer.c | 12 | ||||
| -rw-r--r-- | kernel/timer.c | 2 |
3 files changed, 16 insertions, 1 deletions
diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h index 5bdbc74..17c29dc 100644 --- a/include/linux/hrtimer.h +++ b/include/linux/hrtimer.h @@ -206,6 +206,7 @@ struct hrtimer_cpu_base { struct clock_event_device; extern void clock_was_set(void); +extern void hres_timers_resume(void); extern void hrtimer_interrupt(struct clock_event_device *dev); /* @@ -236,6 +237,8 @@ static inline ktime_t hrtimer_cb_get_time(struct hrtimer *timer) */ static inline void clock_was_set(void) { } +static inline void hres_timers_resume(void) { } + /* * In non high resolution mode the time reference is taken from * the base softirq time variable. diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c index 067ba2c..b74860a 100644 --- a/kernel/hrtimer.c +++ b/kernel/hrtimer.c @@ -459,6 +459,18 @@ void clock_was_set(void) } /* + * During resume we might have to reprogram the high resolution timer + * interrupt (on the local CPU): + */ +void hres_timers_resume(void) +{ + WARN_ON_ONCE(num_online_cpus() > 1); + + /* Retrigger the CPU local events: */ + retrigger_next_event(NULL); +} + +/* * Check, whether the timer is on the callback pending list */ static inline int hrtimer_cb_pending(const struct hrtimer *timer) diff --git a/kernel/timer.c b/kernel/timer.c index 440048a..dd6c2c1 100644 --- a/kernel/timer.c +++ b/kernel/timer.c @@ -1016,7 +1016,7 @@ static int timekeeping_resume(struct sys_device *dev) clockevents_notify(CLOCK_EVT_NOTIFY_RESUME, NULL); /* Resume hrtimers */ - clock_was_set(); + hres_timers_resume(); return 0; } |
