This is a note to let you know that I've just added the patch titled
alarmtimer: Return relative times in timer_gettime
to the 3.16-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
alarmtimer-return-relative-times-in-timer_gettime.patch
and it can be found in the queue-3.16 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From e86fea764991e00a03ff1e56409ec9cacdbda4c9 Mon Sep 17 00:00:00 2001
From: Richard Larocque <rlarocque@xxxxxxxxxx>
Date: Tue, 9 Sep 2014 18:31:03 -0700
Subject: alarmtimer: Return relative times in timer_gettime
From: Richard Larocque <rlarocque@xxxxxxxxxx>
commit e86fea764991e00a03ff1e56409ec9cacdbda4c9 upstream.
Returns the time remaining for an alarm timer, rather than the time at
which it is scheduled to expire. If the timer has already expired or it
is not currently scheduled, the it_value's members are set to zero.
This new behavior matches that of the other posix-timers and the POSIX
specifications.
This is a change in user-visible behavior, and may break existing
applications. Hopefully, few users rely on the old incorrect behavior.
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Richard Cochran <richardcochran@xxxxxxxxx>
Cc: Prarit Bhargava <prarit@xxxxxxxxxx>
Cc: Sharvil Nanavati <sharvil@xxxxxxxxxx>
Signed-off-by: Richard Larocque <rlarocque@xxxxxxxxxx>
[jstultz: minor style tweak]
Signed-off-by: John Stultz <john.stultz@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/time/alarmtimer.c | 18 +++++++++++-------
1 file changed, 11 insertions(+), 7 deletions(-)
--- a/kernel/time/alarmtimer.c
+++ b/kernel/time/alarmtimer.c
@@ -541,18 +541,22 @@ static int alarm_timer_create(struct k_i
* @new_timer: k_itimer pointer
* @cur_setting: itimerspec data to fill
*
- * Copies the itimerspec data out from the k_itimer
+ * Copies out the current itimerspec data
*/
static void alarm_timer_get(struct k_itimer *timr,
struct itimerspec *cur_setting)
{
- memset(cur_setting, 0, sizeof(struct itimerspec));
+ ktime_t relative_expiry_time =
+ alarm_expires_remaining(&(timr->it.alarm.alarmtimer));
- cur_setting->it_interval =
- ktime_to_timespec(timr->it.alarm.interval);
- cur_setting->it_value =
- ktime_to_timespec(timr->it.alarm.alarmtimer.node.expires);
- return;
+ if (ktime_to_ns(relative_expiry_time) > 0) {
+ cur_setting->it_value = ktime_to_timespec(relative_expiry_time);
+ } else {
+ cur_setting->it_value.tv_sec = 0;
+ cur_setting->it_value.tv_nsec = 0;
+ }
+
+ cur_setting->it_interval = ktime_to_timespec(timr->it.alarm.interval);
}
/**
Patches currently in stable-queue which might be from rlarocque@xxxxxxxxxx are
queue-3.16/alarmtimer-return-relative-times-in-timer_gettime.patch
queue-3.16/alarmtimer-do-not-signal-sigev_none-timers.patch
queue-3.16/alarmtimer-lock-k_itimer-during-timer-callback.patch
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