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ktime: Kill non-scalar ktime_t implementation for 2038

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The non-scalar ktime_t implementation is basically a timespec
which has to be changed to support dates past 2038 on 32bit
systems.

This patch removes the non-scalar ktime_t implementation, forcing
the scalar s64 nanosecond version on all architectures.

This may have additional performance overhead on some 32bit
systems when converting between ktime_t and timespec structures,
however the majority of 32bit systems (arm and i386) were already
using scalar ktime_t, so no performance regressions will be seen
on those platforms.

On affected platforms, I'm open to finding optimizations, including
avoiding converting to timespecs where possible.

[ tglx: We can now cleanup the ktime_t.tv64 mess, but thats a
  different issue and we can throw a coccinelle script at it ]

Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: John Stultz <john.stultz@linaro.org>
This commit is contained in:
John Stultz 2014-07-16 21:03:53 +00:00
parent 76f4108892
commit 24e4a8c3e8
9 changed files with 7 additions and 246 deletions
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11
include/linux/time.h
View file

@ -19,6 +19,10 @@ extern struct timezone sys_tz;
#define TIME_T_MAX (time_t)((1UL << ((sizeof(time_t) << 3) - 1)) - 1)
/* Located here for timespec_valid_strict */
#define KTIME_MAX ((s64)~((u64)1 << 63))
#define KTIME_SEC_MAX (KTIME_MAX / NSEC_PER_SEC)
static inline int timespec_equal(const struct timespec *a,
const struct timespec *b)
{
@ -84,13 +88,6 @@ 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:
*/