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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>
This commit is contained in:
Chunyan Zhang 2014-12-17 13:11:35 +08:00 committed by Thomas Gleixner
parent ec6f34e5b5
commit 41fbf3b39d
1 changed files with 5 additions and 0 deletions
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include/linux/ktime.h
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@ -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);