diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/time.h | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/include/linux/time.h b/include/linux/time.h index 64e79746458..f639fde2925 100644 --- a/include/linux/time.h +++ b/include/linux/time.h @@ -50,6 +50,12 @@ extern void set_normalized_timespec(struct timespec *ts, time_t sec, long nsec); #define timespec_valid(ts) \ (((ts)->tv_sec >= 0) && (((unsigned) (ts)->tv_nsec) < NSEC_PER_SEC)) +/* + * 64-bit nanosec type. Large enough to span 292+ years in nanosecond + * resolution. Ought to be enough for a while. + */ +typedef s64 nsec_t; + extern struct timespec xtime; extern struct timespec wall_to_monotonic; extern seqlock_t xtime_lock; @@ -79,6 +85,47 @@ extern void getnstimestamp(struct timespec *ts); extern struct timespec timespec_trunc(struct timespec t, unsigned gran); +/** + * timespec_to_ns - Convert timespec to nanoseconds + * @ts: pointer to the timespec variable to be converted + * + * Returns the scalar nanosecond representation of the timespec + * parameter. + */ +static inline nsec_t timespec_to_ns(const struct timespec *ts) +{ + return ((nsec_t) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec; +} + +/** + * timeval_to_ns - Convert timeval to nanoseconds + * @ts: pointer to the timeval variable to be converted + * + * Returns the scalar nanosecond representation of the timeval + * parameter. + */ +static inline nsec_t timeval_to_ns(const struct timeval *tv) +{ + return ((nsec_t) tv->tv_sec * NSEC_PER_SEC) + + tv->tv_usec * NSEC_PER_USEC; +} + +/** + * ns_to_timespec - Convert nanoseconds to timespec + * @nsec: the nanoseconds value to be converted + * + * Returns the timespec representation of the nsec parameter. + */ +extern struct timespec ns_to_timespec(const nsec_t nsec); + +/** + * ns_to_timeval - Convert nanoseconds to timeval + * @nsec: the nanoseconds value to be converted + * + * Returns the timeval representation of the nsec parameter. + */ +extern struct timeval ns_to_timeval(const nsec_t nsec); + #endif /* __KERNEL__ */ #define NFDBITS __NFDBITS |