[KTIME]: Introduce ktime_us_delta
authorGerrit Renker <gerrit@erg.abdn.ac.uk>
Sat, 16 Jun 2007 15:38:51 +0000 (12:38 -0300)
committerDavid S. Miller <davem@sunset.davemloft.net>
Wed, 11 Jul 2007 05:15:25 +0000 (22:15 -0700)
This provides a reusable time difference function which returns the difference in
microseconds, as often used in the DCCP code.

Commiter note: renamed ktime_delta to ktime_us_delta and put it in ktime.h.

Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
include/linux/ktime.h

index 2b139f66027f3de7ae5f1a60df00ddf39c8cb147..923665958f904157d330abae69bd1f4ec6f8b941 100644 (file)
@@ -279,6 +279,11 @@ static inline s64 ktime_to_us(const ktime_t kt)
        return (s64) tv.tv_sec * USEC_PER_SEC + tv.tv_usec;
 }
 
+static inline s64 ktime_us_delta(const ktime_t later, const ktime_t earlier)
+{
+       return ktime_to_us(ktime_sub(later, earlier));
+}
+
 /*
  * The resolution of the clocks. The resolution value is returned in
  * the clock_getres() system call to give application programmers an