[Patch 1/9] timestamp diff

[Shailabh Nagar <nagar@watson.ibm.com>]

nstimestamp_diff.patch

Add kernel utility function for measuring the
interval (diff) between two timespec values

Comments addressed (commenter)

- returns difference as timespec instead of nsecs (Arjan)

Signed-off-by: Balbir Singh <balbir@in.ibm.com>
Signed-off-by: Shailabh Nagar <nagar@us.ibm.com>


 include/linux/time.h |   14 ++++++++++++++
 1 files changed, 14 insertions(+)

Index: linux-2.6.16-rc5/include/linux/time.h
===================================================================
--- linux-2.6.16-rc5.orig/include/linux/time.h	2006-03-10 17:56:56.000000000 -0500
+++ linux-2.6.16-rc5/include/linux/time.h	2006-03-10 17:57:26.000000000 -0500
@@ -147,6 +147,20 @@ extern struct timespec ns_to_timespec(co
  */
 extern struct timeval ns_to_timeval(const nsec_t nsec);
 
+/**
+ * timespec_diff - Return difference of timespecs as a timespec
+ * @start:	first timespec
+ * @end:	second timespec
+ * @ret:	result timespec
+ *
+ * Returns the difference between @start and @end in @ret
+ */
+static inline void timespec_diff(struct timespec *start, struct timespec *end,
+				 struct timespec *ret)
+{
+	ret->tv_sec = end->tv_sec - start->tv_sec;
+	ret->tv_nsec = end->tv_nsec - start->tv_nsec;
+}
 #endif /* __KERNEL__ */
 
 #define NFDBITS			__NFDBITS


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