diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2020-11-17 14:19:44 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2020-11-19 10:48:28 +0100 |
| commit | c398960cd82b233886fbff163986f998b5a5c008 (patch) | |
| tree | 6d73b864dac7e999941a34ade55baa1b403e2013 /kernel/time/tick-sched.c | |
| parent | f73f64d5687192bc8eb7f3d9521ca6256b79f224 (diff) | |
tick: Document protections for tick related data
The protection rules for tick_next_period and last_jiffies_update are blury
at best. Clarify this.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20201117132006.197713794@linutronix.de
Diffstat (limited to 'kernel/time/tick-sched.c')
| -rw-r--r-- | kernel/time/tick-sched.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c index 81632cd5e3b7..15360e652c85 100644 --- a/kernel/time/tick-sched.c +++ b/kernel/time/tick-sched.c @@ -44,7 +44,9 @@ struct tick_sched *tick_get_tick_sched(int cpu) #if defined(CONFIG_NO_HZ_COMMON) || defined(CONFIG_HIGH_RES_TIMERS) /* - * The time, when the last jiffy update happened. Protected by jiffies_lock. + * The time, when the last jiffy update happened. Write access must hold + * jiffies_lock and jiffies_seq. tick_nohz_next_event() needs to get a + * consistent view of jiffies and last_jiffies_update. */ static ktime_t last_jiffies_update; |