[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>

1 files changed, 21 insertions, 0 deletions

diff --git a/include/linux/ktime.h b/include/linux/ktime.h
index dae7143..a6ddec1 100644
--- a/include/linux/ktime.h
+++ b/include/linux/ktime.h
@@ -102,6 +102,13 @@ static inline ktime_t ktime_set(const long secs, const unsigned long nsecs)
 #define ktime_add_ns(kt, nsval) \
 		({ (ktime_t){ .tv64 = (kt).tv64 + (nsval) }; })
 
+/*
+ * Subtract a scalar nanosecod from a ktime_t variable
+ * res = kt - nsval:
+ */
+#define ktime_sub_ns(kt, nsval) \
+		({ (ktime_t){ .tv64 = (kt).tv64 - (nsval) }; })
+
 /* convert a timespec to ktime_t format: */
 static inline ktime_t timespec_to_ktime(struct timespec ts)
 {
@@ -200,6 +207,15 @@ static inline ktime_t ktime_add(const ktime_t add1, const ktime_t add2)
 extern ktime_t ktime_add_ns(const ktime_t kt, u64 nsec);
 
 /**
+ * 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
+ */
+extern ktime_t ktime_sub_ns(const ktime_t kt, u64 nsec);
+
+/**
  * timespec_to_ktime - convert a timespec to ktime_t format
  * @ts:		the timespec variable to convert
  *
@@ -289,6 +305,11 @@ static inline ktime_t ktime_add_us(const ktime_t kt, const u64 usec)
 	return ktime_add_ns(kt, usec * 1000);
 }
 
+static inline ktime_t ktime_sub_us(const ktime_t kt, const u64 usec)
+{
+	return ktime_sub_ns(kt, usec * 1000);
+}
+
 /*
  * The resolution of the clocks. The resolution value is returned in
  * the clock_getres() system call to give application programmers an