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authorThomas Gleixner <tglx@linutronix.de>2008-12-22 23:05:28 +0100
committerIngo Molnar <mingo@elte.hu>2008-12-31 09:53:21 +0100
commit1c5745aa380efb6417b5681104b007c8612fb496 (patch)
tree263b81742f7973c0dd86efe414a79a324c0769e4 /kernel/sched_clock.c
parent6a94cb73064c952255336cc57731904174b2c58f (diff)
downloadlwn-1c5745aa380efb6417b5681104b007c8612fb496.tar.gz
lwn-1c5745aa380efb6417b5681104b007c8612fb496.zip
sched_clock: prevent scd->clock from moving backwards, take #2
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>
Diffstat (limited to 'kernel/sched_clock.c')
-rw-r--r--kernel/sched_clock.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/kernel/sched_clock.c b/kernel/sched_clock.c
index e8ab096ddfe3..a0b0852414cc 100644
--- a/kernel/sched_clock.c
+++ b/kernel/sched_clock.c
@@ -124,7 +124,7 @@ static u64 __update_sched_clock(struct sched_clock_data *scd, u64 now)
clock = scd->tick_gtod + delta;
min_clock = wrap_max(scd->tick_gtod, scd->clock);
- max_clock = scd->tick_gtod + TICK_NSEC;
+ max_clock = wrap_max(scd->clock, scd->tick_gtod + TICK_NSEC);
clock = wrap_max(clock, min_clock);
clock = wrap_min(clock, max_clock);
@@ -227,6 +227,9 @@ EXPORT_SYMBOL_GPL(sched_clock_idle_sleep_event);
*/
void sched_clock_idle_wakeup_event(u64 delta_ns)
{
+ if (timekeeping_suspended)
+ return;
+
sched_clock_tick();
touch_softlockup_watchdog();
}