tick-sched: Don't call update_wall_time() when delta is lesser than tick_period
In tick_do_update_jiffies64() we are processing ticks only if delta is
greater than tick_period. This is what we are supposed to do here and
it broke a bit with this patch:
commit 47a1b796
(tick/timekeeping: Call update_wall_time outside the
jiffies lock)
With above patch, we might end up calling update_wall_time() even if
delta is found to be smaller that tick_period. Fix this by returning
when the delta is less than tick period.
[ tglx: Made it a 3 liner and massaged changelog ]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Cc: linaro-kernel@lists.linaro.org
Cc: fweisbec@gmail.com
Cc: Arvind.Chauhan@arm.com
Cc: linaro-networking@linaro.org
Cc: John Stultz <john.stultz@linaro.org>
Cc: <stable@vger.kernel.org> # v3.14+
Link: http://lkml.kernel.org/r/80afb18a494b0bd9710975bcc4de134ae323c74f.1397537987.git.viresh.kumar@linaro.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
parent
521c42990e
commit
03e6bdc5c4
|
@ -84,6 +84,9 @@ static void tick_do_update_jiffies64(ktime_t now)
|
||||||
|
|
||||||
/* Keep the tick_next_period variable up to date */
|
/* Keep the tick_next_period variable up to date */
|
||||||
tick_next_period = ktime_add(last_jiffies_update, tick_period);
|
tick_next_period = ktime_add(last_jiffies_update, tick_period);
|
||||||
|
} else {
|
||||||
|
write_sequnlock(&jiffies_lock);
|
||||||
|
return;
|
||||||
}
|
}
|
||||||
write_sequnlock(&jiffies_lock);
|
write_sequnlock(&jiffies_lock);
|
||||||
update_wall_time();
|
update_wall_time();
|
||||||
|
|
Loading…
Reference in New Issue