diff options
| author | Amit Pundir <amit.pundir@linaro.org> | 2018-01-22 11:50:22 +0530 |
|---|---|---|
| committer | Amit Pundir <amit.pundir@linaro.org> | 2018-01-22 11:50:22 +0530 |
| commit | 395ae9f4e6934c9f61d7002dc12b267d0c302104 (patch) | |
| tree | d80d145feb56614796dfe6c2ce41db16b290daf3 /kernel/time | |
| parent | 317c5652a7c300c2d82ef5bfae8d3558f389d219 (diff) | |
| parent | 13b48cd3ac945d4e4075bec53f107a315fe771ae (diff) | |
Merge branch 'linux-linaro-lsk-v4.4' into linux-linaro-lsk-v4.4-android
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
Conflicts:
kernel/fork.c
Conflict due to Kaiser implementation in LTS 4.4.110.
net/ipv4/raw.c
Minor conflict due to LTS commit
be27b620a861 ("net: ipv4: fix for a race condition in raw_sendmsg")
Diffstat (limited to 'kernel/time')
| -rw-r--r-- | kernel/time/tick-sched.c | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c index 34f9a9c417d9..a935cbdc55a4 100644 --- a/kernel/time/tick-sched.c +++ b/kernel/time/tick-sched.c @@ -568,6 +568,11 @@ static void tick_nohz_restart(struct tick_sched *ts, ktime_t now) tick_program_event(hrtimer_get_expires(&ts->sched_timer), 1); } +static inline bool local_timer_softirq_pending(void) +{ + return local_softirq_pending() & TIMER_SOFTIRQ; +} + static ktime_t tick_nohz_stop_sched_tick(struct tick_sched *ts, ktime_t now, int cpu) { @@ -584,8 +589,18 @@ static ktime_t tick_nohz_stop_sched_tick(struct tick_sched *ts, } while (read_seqretry(&jiffies_lock, seq)); ts->last_jiffies = basejiff; - if (rcu_needs_cpu(basemono, &next_rcu) || - arch_needs_cpu() || irq_work_needs_cpu()) { + /* + * Keep the periodic tick, when RCU, architecture or irq_work + * requests it. + * Aside of that check whether the local timer softirq is + * pending. If so its a bad idea to call get_next_timer_interrupt() + * because there is an already expired timer, so it will request + * immeditate expiry, which rearms the hardware timer with a + * minimal delta which brings us back to this place + * immediately. Lather, rinse and repeat... + */ + if (rcu_needs_cpu(basemono, &next_rcu) || arch_needs_cpu() || + irq_work_needs_cpu() || local_timer_softirq_pending()) { next_tick = basemono + TICK_NSEC; } else { /* |