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

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Message-ID: <tip-e7561f1633ac735df48c55ad09a2530e9ab9fab1@git.kernel.org>
Date:   Mon, 5 Jun 2017 01:24:01 -0700
From:   tip-bot for Thomas Gleixner <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     mingo@...nel.org, john.stultz@...aro.org,
        linux-kernel@...r.kernel.org, tglx@...utronix.de, hpa@...or.com,
        peterz@...radead.org
Subject: [tip:timers/core] alarmtimer: Implement forward callback

Commit-ID:  e7561f1633ac735df48c55ad09a2530e9ab9fab1
Gitweb:     http://git.kernel.org/tip/e7561f1633ac735df48c55ad09a2530e9ab9fab1
Author:     Thomas Gleixner <tglx@...utronix.de>
AuthorDate: Tue, 30 May 2017 23:15:55 +0200
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Sun, 4 Jun 2017 15:40:30 +0200

alarmtimer: Implement forward 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/20170530211657.513694229@linutronix.de

---
 kernel/time/alarmtimer.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c
index be85e3c..6082cf1 100644
--- a/kernel/time/alarmtimer.c
+++ b/kernel/time/alarmtimer.c
@@ -549,6 +549,18 @@ static void alarm_timer_rearm(struct k_itimer *timr)
 }
 
 /**
+ * alarm_timer_forward - Posix timer callback for forwarding timer
+ * @timr:	Pointer to the posixtimer data struct
+ * @now:	Current time to forward the timer against
+ */
+static int alarm_timer_forward(struct k_itimer *timr, ktime_t now)
+{
+	struct alarm *alarm = &timr->it.alarm.alarmtimer;
+
+	return (int) alarm_forward(alarm, timr->it_interval, now);
+}
+
+/**
  * alarm_clock_getres - posix getres interface
  * @which_clock: clockid
  * @tp: timespec to fill
@@ -876,6 +888,7 @@ const struct k_clock alarm_clock = {
 	.timer_del	= alarm_timer_del,
 	.timer_get	= alarm_timer_get,
 	.timer_rearm	= alarm_timer_rearm,
+	.timer_forward	= alarm_timer_forward,
 	.nsleep		= alarm_timer_nsleep,
 };
 #endif /* CONFIG_POSIX_TIMERS */