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| author | Thomas Gleixner <tglx@linutronix.de> | 2007-03-16 23:25:52 (GMT) |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-03-17 02:35:25 (GMT) |
| commit | cd05a1f818073a623455a58e756c5b419fc98db9 (patch) | |
| tree | 4e148e96f00fe07b0c53a379e812344733e8484a /kernel/time/tick-internal.h | |
| parent | 24c4ac070adffe4a21f3a8daf4aee7c98fa6c4f9 (diff) | |
| download | linux-cd05a1f818073a623455a58e756c5b419fc98db9.tar.xz | |
[PATCH] clockevents: Fix suspend/resume to disk hangs
I finally found a dual core box, which survives suspend/resume without
crashing in the middle of nowhere. Sigh, I never figured out from the
code and the bug reports what's going on.
The observed hangs are caused by a stale state transition of the clock
event devices, which keeps the RCU synchronization away from completion,
when the non boot CPU is brought back up.
The suspend/resume in oneshot mode needs the similar care as the
periodic mode during suspend to RAM. My assumption that the state
transitions during the different shutdown/bringups of s2disk would go
through the periodic boot phase and then switch over to highres resp.
nohz mode were simply wrong.
Add the appropriate suspend / resume handling for the non periodic
modes.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/time/tick-internal.h')
| -rw-r--r-- | kernel/time/tick-internal.h | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/kernel/time/tick-internal.h b/kernel/time/tick-internal.h index 75890ef..c9d203b 100644 --- a/kernel/time/tick-internal.h +++ b/kernel/time/tick-internal.h @@ -19,12 +19,13 @@ extern void tick_setup_oneshot(struct clock_event_device *newdev, extern int tick_program_event(ktime_t expires, int force); extern void tick_oneshot_notify(void); extern int tick_switch_to_oneshot(void (*handler)(struct clock_event_device *)); - +extern void tick_resume_oneshot(void); # ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST extern void tick_broadcast_setup_oneshot(struct clock_event_device *bc); extern void tick_broadcast_oneshot_control(unsigned long reason); extern void tick_broadcast_switch_to_oneshot(void); extern void tick_shutdown_broadcast_oneshot(unsigned int *cpup); +extern int tick_resume_broadcast_oneshot(struct clock_event_device *bc); # else /* BROADCAST */ static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc) { @@ -43,6 +44,10 @@ void tick_setup_oneshot(struct clock_event_device *newdev, { BUG(); } +static inline void tick_resume_oneshot(void) +{ + BUG(); +} static inline int tick_program_event(ktime_t expires, int force) { return 0; @@ -54,6 +59,10 @@ static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc) } static inline void tick_broadcast_oneshot_control(unsigned long reason) { } static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { } +static inline int tick_resume_broadcast_oneshot(struct clock_event_device *bc) +{ + return 0; +} #endif /* !TICK_ONESHOT */ /* |