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| author | Arnaldo Carvalho de Melo <acme@ghostprotocols.net> | 2007-08-19 17:16:05 -0700 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2007-10-10 16:48:12 -0700 |
| commit | a272378d1128d1c60a463a315646c86d174ff74c (patch) | |
| tree | f583426e350d48b216f1e09adcc01522bcc8adc9 /kernel/hrtimer.c | |
| parent | e7a81c6d62cbefdeb23d92ad891f429bde1c49d2 (diff) | |
| download | lwn-a272378d1128d1c60a463a315646c86d174ff74c.tar.gz lwn-a272378d1128d1c60a463a315646c86d174ff74c.zip | |
[KTIME]: Introduce ktime_sub_ns and ktime_sub_us
First user will be the DCCP transport networking protocol.
Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'kernel/hrtimer.c')
| -rw-r--r-- | kernel/hrtimer.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c index c21ca6bfaa66..dc8a4451d79b 100644 --- a/kernel/hrtimer.c +++ b/kernel/hrtimer.c @@ -277,6 +277,30 @@ ktime_t ktime_add_ns(const ktime_t kt, u64 nsec) } EXPORT_SYMBOL_GPL(ktime_add_ns); + +/** + * ktime_sub_ns - Subtract a scalar nanoseconds value from a ktime_t variable + * @kt: minuend + * @nsec: the scalar nsec value to subtract + * + * Returns the subtraction of @nsec from @kt in ktime_t format + */ +ktime_t ktime_sub_ns(const ktime_t kt, u64 nsec) +{ + ktime_t tmp; + + if (likely(nsec < NSEC_PER_SEC)) { + tmp.tv64 = nsec; + } else { + unsigned long rem = do_div(nsec, NSEC_PER_SEC); + + tmp = ktime_set((long)nsec, rem); + } + + return ktime_sub(kt, tmp); +} + +EXPORT_SYMBOL_GPL(ktime_sub_ns); # endif /* !CONFIG_KTIME_SCALAR */ /* |