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authorArnaldo Carvalho de Melo <acme@ghostprotocols.net>2007-08-19 17:16:05 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2007-10-10 16:48:12 -0700
commita272378d1128d1c60a463a315646c86d174ff74c (patch)
treef583426e350d48b216f1e09adcc01522bcc8adc9 /kernel/hrtimer.c
parente7a81c6d62cbefdeb23d92ad891f429bde1c49d2 (diff)
[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.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index c21ca6bfaa6..dc8a4451d79 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 */
/*