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 <[email protected]>
Signed-off-by: Shailabh Nagar <[email protected]>
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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