linux-kernel - [tip:timers/core] alarmtimer: Implement timer

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Date:   Mon, 5 Jun 2017 01:23:27 -0700
From:   tip-bot for Thomas Gleixner <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     hpa@...or.com, john.stultz@...aro.org, peterz@...radead.org,
        tglx@...utronix.de, mingo@...nel.org, linux-kernel@...r.kernel.org
Subject: [tip:timers/core] alarmtimer: Implement timer_rearm() callback

Commit-ID:  b3db80f77a95a45dbb2136f7b2a364dc797ea914
Gitweb:     http://git.kernel.org/tip/b3db80f77a95a45dbb2136f7b2a364dc797ea914
Author:     Thomas Gleixner <tglx@...utronix.de>
AuthorDate: Tue, 30 May 2017 23:15:54 +0200
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Sun, 4 Jun 2017 15:40:30 +0200

alarmtimer: Implement timer_rearm() callback

Preparatory change to utilize the common posix timer mechanisms.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: John Stultz <john.stultz@...aro.org>
Link: http://lkml.kernel.org/r/20170530211657.434598989@linutronix.de

---
 kernel/time/alarmtimer.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c
index 5b8cf4b..be85e3c 100644
--- a/kernel/time/alarmtimer.c
+++ b/kernel/time/alarmtimer.c
@@ -537,6 +537,18 @@ static enum alarmtimer_restart alarm_handle_timer(struct alarm *alarm,
 }
 
 /**
+ * alarm_timer_rearm - Posix timer callback for rearming timer
+ * @timr:	Pointer to the posixtimer data struct
+ */
+static void alarm_timer_rearm(struct k_itimer *timr)
+{
+	struct alarm *alarm = &timr->it.alarm.alarmtimer;
+
+	timr->it_overrun += alarm_forward_now(alarm, timr->it_interval);
+	alarm_start(alarm, alarm->node.expires);
+}
+
+/**
  * alarm_clock_getres - posix getres interface
  * @which_clock: clockid
  * @tp: timespec to fill
@@ -594,7 +606,7 @@ static int alarm_timer_create(struct k_itimer *new_timer)
 
 /**
  * alarm_timer_get - posix timer_get interface
- * @new_timer: k_itimer pointer
+ * @timr: k_itimer pointer
  * @cur_setting: itimerspec data to fill
  *
  * Copies out the current itimerspec data
@@ -863,6 +875,7 @@ const struct k_clock alarm_clock = {
 	.timer_set	= alarm_timer_set,
 	.timer_del	= alarm_timer_del,
 	.timer_get	= alarm_timer_get,
+	.timer_rearm	= alarm_timer_rearm,
 	.nsleep		= alarm_timer_nsleep,
 };
 #endif /* CONFIG_POSIX_TIMERS */