diff options
Diffstat (limited to 'arch/um/kernel/time.c')
| -rw-r--r-- | arch/um/kernel/time.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/arch/um/kernel/time.c b/arch/um/kernel/time.c index 29b27b90581f..1394568c0210 100644 --- a/arch/um/kernel/time.c +++ b/arch/um/kernel/time.c @@ -25,6 +25,8 @@ #include <shared/init.h> #ifdef CONFIG_UML_TIME_TRAVEL_SUPPORT +#include <linux/sched/clock.h> + enum time_travel_mode time_travel_mode; EXPORT_SYMBOL_GPL(time_travel_mode); @@ -47,6 +49,15 @@ static u16 time_travel_shm_id; static struct um_timetravel_schedshm *time_travel_shm; static union um_timetravel_schedshm_client *time_travel_shm_client; +unsigned long tt_extra_sched_jiffies; + +notrace unsigned long long sched_clock(void) +{ + return (unsigned long long)(jiffies - INITIAL_JIFFIES + + tt_extra_sched_jiffies) + * (NSEC_PER_SEC / HZ); +} + static void time_travel_set_time(unsigned long long ns) { if (unlikely(ns < time_travel_time)) @@ -443,6 +454,11 @@ static void time_travel_periodic_timer(struct time_travel_event *e) { time_travel_add_event(&time_travel_timer_event, time_travel_time + time_travel_timer_interval); + + /* clock tick; decrease extra jiffies by keeping sched_clock constant */ + if (tt_extra_sched_jiffies > 0) + tt_extra_sched_jiffies -= 1; + deliver_alarm(); } @@ -594,6 +610,10 @@ EXPORT_SYMBOL_GPL(time_travel_add_irq_event); static void time_travel_oneshot_timer(struct time_travel_event *e) { + /* clock tick; decrease extra jiffies by keeping sched_clock constant */ + if (tt_extra_sched_jiffies > 0) + tt_extra_sched_jiffies -= 1; + deliver_alarm(); } |