summaryrefslogtreecommitdiff
path: root/kernel
diff options
context:
space:
mode:
authorViresh Kumar <viresh.kumar@linaro.org>2014-04-15 10:54:40 +0530
committerThomas Gleixner <tglx@linutronix.de>2014-04-15 20:26:45 +0200
commit03e6bdc5c4d0fc166bfd5d3cf749a5a0c1b5b1bd (patch)
tree0c66bdc3be7d9b8087352ed9d3dbc7fbaf2382a3 /kernel
parent521c42990e9d561ed5ed9f501f07639d0512b3c9 (diff)
downloadlinux-03e6bdc5c4d0fc166bfd5d3cf749a5a0c1b5b1bd.tar.gz
linux-03e6bdc5c4d0fc166bfd5d3cf749a5a0c1b5b1bd.tar.xz
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>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/time/tick-sched.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 9f8af69..e947d96 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -84,6 +84,9 @@ static void tick_do_update_jiffies64(ktime_t now)
/* Keep the tick_next_period variable up to date */
tick_next_period = ktime_add(last_jiffies_update, tick_period);
+ } else {
+ write_sequnlock(&jiffies_lock);
+ return;
}
write_sequnlock(&jiffies_lock);
update_wall_time();