diff options
| author | Richard Cochran (linutronix GmbH) <richardcochran@gmail.com> | 2024-02-21 10:05:44 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2024-02-22 17:52:32 +0100 |
| commit | 4c532939aa2e9345ee346bc69d3d12d56d5aa9aa (patch) | |
| tree | 3091c13f6d4a736178d95bb761d6a3c2b5adf4cf /kernel/time/tick-sched.c | |
| parent | 89f01e10c99a5ca2ff88b545fad763d360cdbfc8 (diff) | |
tick/sched: Split out jiffies update helper function
The logic to get the time of the last jiffies update will be needed by
the timer pull model as well.
Move the code into a global function in anticipation of the new caller.
No functional change.
Signed-off-by: Richard Cochran (linutronix GmbH) <richardcochran@gmail.com>
Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Link: https://lore.kernel.org/r/20240221090548.36600-17-anna-maria@linutronix.de
Diffstat (limited to 'kernel/time/tick-sched.c')
| -rw-r--r-- | kernel/time/tick-sched.c | 26 |
1 files changed, 19 insertions, 7 deletions
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c index f6b613380229..417bb7f880ca 100644 --- a/kernel/time/tick-sched.c +++ b/kernel/time/tick-sched.c @@ -799,6 +799,24 @@ static inline bool local_timer_softirq_pending(void) return local_softirq_pending() & BIT(TIMER_SOFTIRQ); } +/* + * Read jiffies and the time when jiffies were updated last + */ +u64 get_jiffies_update(unsigned long *basej) +{ + unsigned long basejiff; + unsigned int seq; + u64 basemono; + + do { + seq = read_seqcount_begin(&jiffies_seq); + basemono = last_jiffies_update; + basejiff = jiffies; + } while (read_seqcount_retry(&jiffies_seq, seq)); + *basej = basejiff; + return basemono; +} + /** * tick_nohz_next_event() - return the clock monotonic based next event * @ts: pointer to tick_sched struct @@ -813,14 +831,8 @@ static ktime_t tick_nohz_next_event(struct tick_sched *ts, int cpu) { u64 basemono, next_tick, delta, expires; unsigned long basejiff; - unsigned int seq; - /* Read jiffies and the time when jiffies were updated last */ - do { - seq = read_seqcount_begin(&jiffies_seq); - basemono = last_jiffies_update; - basejiff = jiffies; - } while (read_seqcount_retry(&jiffies_seq, seq)); + basemono = get_jiffies_update(&basejiff); ts->last_jiffies = basejiff; ts->timer_expires_base = basemono; |