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sched_clock: prevent scd->clock from moving backwards, take #2

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Redo:

  5b7dba4: sched_clock: prevent scd->clock from moving backwards

which had to be reverted due to s2ram hangs:

  ca7e716: Revert "sched_clock: prevent scd->clock from moving backwards"

... this time with resume restoring GTOD later in the sequence
taken into account as well.

The "timekeeping_suspended" flag is not very nice but we cannot call into
GTOD before it has been properly resumed and the scheduler will run very
early in the resume sequence.

Cc: <stable@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Thomas Gleixner
2008-12-22 23:05:28 +01:00
committed by Ingo Molnar
parent 6a94cb7306
commit 1c5745aa38
3 changed files with 10 additions and 3 deletions
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include/linux/time.h
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@@ -105,6 +105,7 @@ extern unsigned long read_persistent_clock(void);
extern int update_persistent_clock(struct timespec now);
extern int no_sync_cmos_clock __read_mostly;
void timekeeping_init(void);
extern int timekeeping_suspended;
unsigned long get_seconds(void);
struct timespec current_kernel_time(void);