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authorThomas Gleixner <tglx@linutronix.de>2007-03-17 00:25:52 +0100
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-03-16 19:35:25 -0700
commitcd05a1f818073a623455a58e756c5b419fc98db9 (patch)
tree4e148e96f00fe07b0c53a379e812344733e8484a /kernel/time/tick-internal.h
parent24c4ac070adffe4a21f3a8daf4aee7c98fa6c4f9 (diff)
downloadlinaro-lsk-cd05a1f818073a623455a58e756c5b419fc98db9.tar.gz
[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.h11
1 files changed, 10 insertions, 1 deletions
diff --git a/kernel/time/tick-internal.h b/kernel/time/tick-internal.h
index 75890efd24f..c9d203bde51 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 */
/*