linux-kernel - [PATCH 1/3] ktime.h: Introduce ktime_ms

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Message-Id: <1418903522-19137-2-git-send-email-zhang.chunyan@linaro.org>
Date:	Thu, 18 Dec 2014 19:52:00 +0800
From:	Chunyan Zhang <zhang.chunyan@...aro.org>
To:	m.chehab@...sung.com, david@...deman.nu, uli-lirc@...-eckhardt.de,
	hans.verkuil@...co.com, julia.lawall@...6.fr, himangi774@...il.com,
	khoroshilov@...ras.ru, joe@...ches.com, dborkman@...hat.com,
	john.stultz@...aro.org, tglx@...utronix.de, davem@...emloft.net,
	dwmw2@...radead.org, computersforpeace@...il.com, arnd@...aro.org
Cc:	linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-media@...r.kernel.org, zhang.lyra@...il.com
Subject: [PATCH 1/3] ktime.h: Introduce ktime_ms_delta

This patch introduces a reusable time difference function which returns
the difference in millisecond, as often used in some driver code, e.g.
mtd/test, media/rc, etc.

Signed-off-by: Chunyan Zhang <zhang.chunyan@...aro.org>
Acked-by: Arnd Bergmann <arnd@...aro.org>
---
 include/linux/ktime.h |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/linux/ktime.h b/include/linux/ktime.h
index c9d645a..891ea92 100644
--- a/include/linux/ktime.h
+++ b/include/linux/ktime.h
@@ -186,6 +186,11 @@ static inline s64 ktime_us_delta(const ktime_t later, const ktime_t earlier)
        return ktime_to_us(ktime_sub(later, earlier));
 }
 
+static inline s64 ktime_ms_delta(const ktime_t later, const ktime_t earlier)
+{
+	return ktime_to_ms(ktime_sub(later, earlier));
+}
+
 static inline ktime_t ktime_add_us(const ktime_t kt, const u64 usec)
 {
 	return ktime_add_ns(kt, usec * NSEC_PER_USEC);
-- 
1.7.9.5

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