diff options
Diffstat (limited to 'include/linux/jiffies.h')
| -rw-r--r-- | include/linux/jiffies.h | 15 |
1 files changed, 2 insertions, 13 deletions
diff --git a/include/linux/jiffies.h b/include/linux/jiffies.h index 4a7e3864e80..388edb54bfb 100644 --- a/include/linux/jiffies.h +++ b/include/linux/jiffies.h @@ -51,21 +51,10 @@ #define SH_DIV(NOM,DEN,LSH) ( (((NOM) / (DEN)) << (LSH)) \ + ((((NOM) % (DEN)) << (LSH)) + (DEN) / 2) / (DEN)) -#ifdef CLOCK_TICK_RATE -/* LATCH is used in the interval timer and ftape setup. */ -# define LATCH ((CLOCK_TICK_RATE + HZ/2) / HZ) /* For divider */ - -/* - * HZ is the requested value. However the CLOCK_TICK_RATE may not allow - * for exactly HZ. So SHIFTED_HZ is high res HZ ("<< 8" is for accuracy) - */ -# define SHIFTED_HZ (SH_DIV(CLOCK_TICK_RATE, LATCH, 8)) -#else -# define SHIFTED_HZ (HZ << 8) -#endif +extern int register_refined_jiffies(long clock_tick_rate); /* TICK_NSEC is the time between ticks in nsec assuming SHIFTED_HZ */ -#define TICK_NSEC (SH_DIV(1000000UL * 1000, SHIFTED_HZ, 8)) +#define TICK_NSEC ((NSEC_PER_SEC+HZ/2)/HZ) /* TICK_USEC is the time between ticks in usec assuming fake USER_HZ */ #define TICK_USEC ((1000000UL + USER_HZ/2) / USER_HZ) |