linux-kernel - [PATCH] hrtimer: add hrtimer_start

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Date:	Thu, 22 Jan 2015 07:12:41 +0100
From:	Olliver Schinagl <o.schinagl@...imaker.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	linux-kernel@...r.kernel.org, Olliver Schinagl <oliver@...inagl.nl>
Subject: [PATCH] hrtimer: add hrtimer_start_now()

From: Olliver Schinagl <oliver@...inagl.nl>

When using a hrtimer for repeating periodic ticks, hrtimer_forward_now()
is often used. Quite possibly the timer loop is thus probably fully
controlled by hrtimer_forward_now() and we don't really care when the
timer is started. With hrtimer_start() we need to define exactly when a
event has to start. By introducing hrtimer_start_now() we do the same as
what hrtimer_forward_now() does, start as soon as possible and get into
the timer loop.

Signed-off-by: Olliver Schinagl <oliver@...inagl.nl>
---
 include/linux/hrtimer.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h
index a036d05..080a5f5 100644
--- a/include/linux/hrtimer.h
+++ b/include/linux/hrtimer.h
@@ -353,6 +353,12 @@ static inline void destroy_hrtimer_on_stack(struct hrtimer *timer) { }
 /* Basic timer operations: */
 extern int hrtimer_start(struct hrtimer *timer, ktime_t tim,
 			 const enum hrtimer_mode mode);
+
+static inline int hrtimer_start_now(struct hrtimer *timer,
+				    const enum hrtimer_mode mode)
+{
+	return hrtimer_start(timer, timer->base->get_time(), mode);
+}
 extern int hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim,
 			unsigned long range_ns, const enum hrtimer_mode mode);
 extern int
-- 
2.1.4

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