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authorThomas Gleixner <tglx@linutronix.de>2020-03-19 19:47:06 +0100
committerThomas Gleixner <tglx@linutronix.de>2020-03-19 19:47:48 +0100
commit52da479a9aee630d2cdf37d05edfe5bcfff3e17f (patch)
treeaba88a3467e6a5c34075e7e86658c051b646ade2
parent2c8bd58812ee3dbf0d78b566822f7eacd34bdd7b (diff)
Revert "tick/common: Make tick_periodic() check for missing ticks"
This reverts commit d441dceb5dce71150f28add80d36d91bbfccba99 due to boot failures. Reported-by: Qian Cai <cai@lca.pw> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Waiman Long <longman@redhat.com>
-rw-r--r--kernel/time/tick-common.c36
1 files changed, 3 insertions, 33 deletions
diff --git a/kernel/time/tick-common.c b/kernel/time/tick-common.c
index cce4ed1515c7..7e5d3524e924 100644
--- a/kernel/time/tick-common.c
+++ b/kernel/time/tick-common.c
@@ -16,7 +16,6 @@
#include <linux/profile.h>
#include <linux/sched.h>
#include <linux/module.h>
-#include <linux/sched/clock.h>
#include <trace/events/power.h>
#include <asm/irq_regs.h>
@@ -85,41 +84,12 @@ int tick_is_oneshot_available(void)
static void tick_periodic(int cpu)
{
if (tick_do_timer_cpu == cpu) {
- /*
- * Use running_clock() as reference to check for missing ticks.
- */
- static ktime_t last_update;
- ktime_t now;
- int ticks = 1;
-
- now = ns_to_ktime(running_clock());
write_seqlock(&jiffies_lock);
- if (last_update) {
- u64 delta = ktime_sub(now, last_update);
-
- /*
- * Check for eventually missed ticks
- *
- * There is likely a persistent delta between
- * last_update and tick_next_period. So they are
- * updated separately.
- */
- if (delta >= 2 * tick_period) {
- s64 period = ktime_to_ns(tick_period);
-
- ticks = ktime_divns(delta, period);
- }
- last_update = ktime_add(last_update,
- ticks * tick_period);
- } else {
- last_update = now;
- }
-
/* Keep track of the next tick event */
- tick_next_period = ktime_add(tick_next_period,
- ticks * tick_period);
- do_timer(ticks);
+ tick_next_period = ktime_add(tick_next_period, tick_period);
+
+ do_timer(1);
write_sequnlock(&jiffies_lock);
update_wall_time();
}

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