diff options
Diffstat (limited to 'include/linux/time64.h')
| -rw-r--r-- | include/linux/time64.h | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/include/linux/time64.h b/include/linux/time64.h index c9dcb3e5781f..9934331c7b86 100644 --- a/include/linux/time64.h +++ b/include/linux/time64.h @@ -20,12 +20,17 @@ struct itimerspec64 { struct timespec64 it_value; }; +/* Parameters used to convert the timespec values: */ +#define PSEC_PER_NSEC 1000L + /* Located here for timespec[64]_valid_strict */ #define TIME64_MAX ((s64)~((u64)1 << 63)) #define TIME64_MIN (-TIME64_MAX - 1) #define KTIME_MAX ((s64)~((u64)1 << 63)) +#define KTIME_MIN (-KTIME_MAX - 1) #define KTIME_SEC_MAX (KTIME_MAX / NSEC_PER_SEC) +#define KTIME_SEC_MIN (KTIME_MIN / NSEC_PER_SEC) /* * Limits for settimeofday(): @@ -44,6 +49,11 @@ static inline int timespec64_equal(const struct timespec64 *a, return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec); } +static inline bool timespec64_is_epoch(const struct timespec64 *ts) +{ + return ts->tv_sec == 0 && ts->tv_nsec == 0; +} + /* * lhs < rhs: return <0 * lhs == rhs: return 0 @@ -124,6 +134,13 @@ static inline bool timespec64_valid_settod(const struct timespec64 *ts) */ static inline s64 timespec64_to_ns(const struct timespec64 *ts) { + /* Prevent multiplication overflow / underflow */ + if (ts->tv_sec >= KTIME_SEC_MAX) + return KTIME_MAX; + + if (ts->tv_sec <= KTIME_SEC_MIN) + return KTIME_MIN; + return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec; } @@ -133,7 +150,7 @@ static inline s64 timespec64_to_ns(const struct timespec64 *ts) * * Returns the timespec64 representation of the nsec parameter. */ -extern struct timespec64 ns_to_timespec64(const s64 nsec); +extern struct timespec64 ns_to_timespec64(s64 nsec); /** * timespec64_add_ns - Adds nanoseconds to a timespec64 |