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Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull timer core update from Thomas Gleixner:
 - Bug fixes (one for a longstanding dead loop issue)
 - Rework of time related vsyscalls
 - Alarm timer updates
 - Jiffies updates to remove compile time dependencies

* 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  timekeeping: Cast raw_interval to u64 to avoid shift overflow
  timers: Fix endless looping between cascade() and internal_add_timer()
  time/jiffies: bring back unconditional LATCH definition
  time: Convert x86_64 to using new update_vsyscall
  time: Only do nanosecond rounding on GENERIC_TIME_VSYSCALL_OLD systems
  time: Introduce new GENERIC_TIME_VSYSCALL
  time: Convert CONFIG_GENERIC_TIME_VSYSCALL to CONFIG_GENERIC_TIME_VSYSCALL_OLD
  time: Move update_vsyscall definitions to timekeeper_internal.h
  time: Move timekeeper structure to timekeeper_internal.h for vsyscall changes
  jiffies: Remove compile time assumptions about CLOCK_TICK_RATE
  jiffies: Kill unused TICK_USEC_TO_NSEC
  alarmtimer: Rename alarmtimer_remove to alarmtimer_dequeue
  alarmtimer: Remove unused helpers & defines
  alarmtimer: Use hrtimer per-alarm instead of per-base
  alarmtimer: Implement minimum alarm interval for allowing suspend
This commit is contained in:
Linus Torvalds 2012-10-12 22:17:48 +09:00
commit 03d3602a83
20 changed files with 288 additions and 264 deletions
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20
include/linux/jiffies.h
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@ -51,31 +51,17 @@
#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 */
#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)
/*
* TICK_USEC_TO_NSEC is the time between ticks in nsec assuming SHIFTED_HZ and
* a value TUSEC for TICK_USEC (can be set bij adjtimex)
*/
#define TICK_USEC_TO_NSEC(TUSEC) (SH_DIV(TUSEC * USER_HZ * 1000, SHIFTED_HZ, 8))
/* some arch's have a small-data section that can be accessed register-relative
* but that can only take up to, say, 4-byte variables. jiffies being part of
* an 8-byte variable may not be correctly accessed unless we force the issue