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[PATCH] hrtimer: introduce nsec_t type and conversion functions

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- introduce the nsec_t type

- basic nsec conversion routines: timespec_to_ns(), timeval_to_ns(),
  ns_to_timespec(), ns_to_timeval().

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Thomas Gleixner 2006-01-09 20:52:30 -08:00 committed by Linus Torvalds
parent 718bcceb5a
commit f8f46da3b4
2 changed files with 83 additions and 0 deletions
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47
include/linux/time.h
View File

@ -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

36
kernel/time.c
View File

@ -652,6 +652,42 @@ void set_normalized_timespec(struct timespec *ts, time_t sec, long nsec)
ts->tv_nsec = nsec;
}
/**
* ns_to_timespec - Convert nanoseconds to timespec
* @nsec: the nanoseconds value to be converted
*
* Returns the timespec representation of the nsec parameter.
*/
inline struct timespec ns_to_timespec(const nsec_t nsec)
{
struct timespec ts;
if (nsec)
ts.tv_sec = div_long_long_rem_signed(nsec, NSEC_PER_SEC,
&ts.tv_nsec);
else
ts.tv_sec = ts.tv_nsec = 0;
return ts;
}
/**
* ns_to_timeval - Convert nanoseconds to timeval
* @nsec: the nanoseconds value to be converted
*
* Returns the timeval representation of the nsec parameter.
*/
struct timeval ns_to_timeval(const nsec_t nsec)
{
struct timespec ts = ns_to_timespec(nsec);
struct timeval tv;
tv.tv_sec = ts.tv_sec;
tv.tv_usec = (suseconds_t) ts.tv_nsec / 1000;
return tv;
}
#if (BITS_PER_LONG < 64)
u64 get_jiffies_64(void)
{