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

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Pull timer fixes from Thomas Gleixner:
 "Mostly small fixes for the fallout of the timekeeping overhaul in 3.6
  along with stable fixes to address an accumulation problem and missing
  sanity checks for RTC readouts and user space provided values."

* 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  time: Avoid making adjustments if we haven't accumulated anything
  time: Avoid potential shift overflow with large shift values
  time: Fix casting issue in timekeeping_forward_now
  time: Ensure we normalize the timekeeper in tk_xtime_add
  time: Improve sanity checking of timekeeping inputs
This commit is contained in:
Linus Torvalds 2012-08-23 21:46:57 -07:00
commit b5bc0c7054
3 changed files with 52 additions and 14 deletions
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7
include/linux/ktime.h
View file

@ -58,13 +58,6 @@ union ktime {
typedef union ktime ktime_t; /* Kill this */
#define KTIME_MAX ((s64)~((u64)1 << 63))
#if (BITS_PER_LONG == 64)
# define KTIME_SEC_MAX (KTIME_MAX / NSEC_PER_SEC)
#else
# define KTIME_SEC_MAX LONG_MAX
#endif
/*
* ktime_t definitions when using the 64-bit scalar representation:
*/

22
include/linux/time.h
View file

@ -107,11 +107,29 @@ static inline struct timespec timespec_sub(struct timespec lhs,
return ts_delta;
}
#define KTIME_MAX ((s64)~((u64)1 << 63))
#if (BITS_PER_LONG == 64)
# define KTIME_SEC_MAX (KTIME_MAX / NSEC_PER_SEC)
#else
# define KTIME_SEC_MAX LONG_MAX
#endif
/*
* Returns true if the timespec is norm, false if denorm:
*/
#define timespec_valid(ts) \
(((ts)->tv_sec >= 0) && (((unsigned long) (ts)->tv_nsec) < NSEC_PER_SEC))
static inline bool timespec_valid(const struct timespec *ts)
{
/* Dates before 1970 are bogus */
if (ts->tv_sec < 0)
return false;
/* Can't have more nanoseconds then a second */
if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC)
return false;
/* Disallow values that could overflow ktime_t */
if ((unsigned long long)ts->tv_sec >= KTIME_SEC_MAX)
return false;
return true;
}
extern void read_persistent_clock(struct timespec *ts);
extern void read_boot_clock(struct timespec *ts);