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From: Chunyan Zhang <zhang.chunyan@linaro.org>
To: tglx@linutronix.de, davem@davemloft.net, john.stultz@linaro.org,
	dborkman@redhat.com
Cc: arnd@linaro.org, linux-kernel@vger.kernel.org, zhang.lyra@gmail.com
Subject: [PATCH] ktime.h: Introduce ktime_ms_delta
Date: Wed, 17 Dec 2014 13:11:35 +0800
Message-ID: <1418793095-18780-1-git-send-email-zhang.chunyan@linaro.org> (raw)
In-Reply-To: <ktime_ms_delta>

This patch adds 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@linaro.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


       reply index

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <ktime_ms_delta>
2014-12-17  5:11 ` Chunyan Zhang [this message]
2014-12-18  7:53   ` Arnd Bergmann
2015-01-23 10:48   ` [tip:timers/core] " tip-bot for Chunyan Zhang

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