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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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36
kernel/time.c
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@ -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)
{