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[PATCH] Time: Introduce arch generic time accessors

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Introduces clocksource switching code and the arch generic time accessor
functions that use the clocksource infrastructure.

Signed-off-by: John Stultz <johnstul@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
john stultz 2006-06-26 00:25:08 -07:00 • committed by Linus Torvalds
parent 5eb6d20533
commit cf3c769b4b
3 changed files with 187 additions and 0 deletions
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15
include/linux/time.h
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@ -102,6 +102,7 @@ extern int do_getitimer(int which, struct itimerval *value);
extern void getnstimeofday(struct timespec *tv);
extern struct timespec timespec_trunc(struct timespec t, unsigned gran);
extern int timekeeping_is_continuous(void);
/**
* timespec_to_ns - Convert timespec to nanoseconds
@ -144,6 +145,20 @@ extern struct timespec ns_to_timespec(const s64 nsec);
*/
extern struct timeval ns_to_timeval(const s64 nsec);
/**
* timespec_add_ns - Adds nanoseconds to a timespec
* @a: pointer to timespec to be incremented
* @ns: unsigned nanoseconds value to be added
*/
static inline void timespec_add_ns(struct timespec *a, u64 ns)
{
ns += a->tv_nsec;
while(unlikely(ns >= NSEC_PER_SEC)) {
ns -= NSEC_PER_SEC;
a->tv_sec++;
}
a->tv_nsec = ns;
}
#endif /* __KERNEL__ */
#define NFDBITS __NFDBITS