[tip:timers/core] ktime.h: Introduce ktime_ms_delta

[tip-bot for Chunyan Zhang <tipbot@zytor.com>]

Commit-ID:  41fbf3b39d5eca01527338b4d0ee15ee1ae1023c
Gitweb:     http://git.kernel.org/tip/41fbf3b39d5eca01527338b4d0ee15ee1ae1023c
Author:     Chunyan Zhang <zhang.chunyan@linaro.org>
AuthorDate: Wed, 17 Dec 2014 13:11:35 +0800
Committer:  Thomas Gleixner <tglx@linutronix.de>
CommitDate: Fri, 23 Jan 2015 11:47:15 +0100

ktime.h: Introduce 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>
Acked-by: Arnd Bergmann <arnd@linaro.org>
Cc: zhang.lyra@gmail.com
Cc: davem@davemloft.net
Cc: john.stultz@linaro.org
Cc: dborkman@redhat.com
Link: http://lkml.kernel.org/r/1418793095-18780-1-git-send-email-zhang.chunyan@linaro.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 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);