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tile: Convert VDSO timekeeping to the precise mechanism

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The code was only halfarsed converted to the new VSDO update mechanism
and still uses the inaccurate base value which lacks the fractional
part of xtime_nsec. Fix it up.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: John Stultz <john.stultz@linaro.org>
This commit is contained in:
Thomas Gleixner 2014-07-16 21:03:49 +00:00 committed by John Stultz
parent 988b0c541e
commit dc01c9fae1
2 changed files with 8 additions and 8 deletions
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9
arch/tile/kernel/time.c
View File

@ -260,7 +260,6 @@ void update_vsyscall_tz(void)
void update_vsyscall(struct timekeeper *tk)
{
struct timespec wall_time = tk_xtime(tk);
struct timespec *wtm = &tk->wall_to_monotonic;
struct clocksource *clock = tk->clock;
@ -271,12 +270,12 @@ void update_vsyscall(struct timekeeper *tk)
++vdso_data->tb_update_count;
smp_wmb();
vdso_data->xtime_tod_stamp = clock->cycle_last;
vdso_data->xtime_clock_sec = wall_time.tv_sec;
vdso_data->xtime_clock_nsec = wall_time.tv_nsec;
vdso_data->xtime_clock_sec = tk->xtime_sec;
vdso_data->xtime_clock_nsec = tk->xtime_nsec;
vdso_data->wtom_clock_sec = wtm->tv_sec;
vdso_data->wtom_clock_nsec = wtm->tv_nsec;
vdso_data->mult = clock->mult;
vdso_data->shift = clock->shift;
vdso_data->mult = tk->mult;
vdso_data->shift = tk->shift;
smp_wmb();
++vdso_data->tb_update_count;
}

7
arch/tile/kernel/vdso/vgettimeofday.c
View File

@ -83,10 +83,11 @@ int __vdso_gettimeofday(struct timeval *tv, struct timezone *tz)
if (count & 1)
continue;
cycles = (get_cycles() - vdso_data->xtime_tod_stamp);
ns = (cycles * vdso_data->mult) >> vdso_data->shift;
sec = vdso_data->xtime_clock_sec;
ns += vdso_data->xtime_clock_nsec;
cycles = get_cycles() - vdso_data->xtime_tod_stamp;
ns = (cycles * vdso_data->mult) + vdso_data->xtime_clock_nsec;
ns >>= vdso_data->shift;
if (ns >= NSEC_PER_SEC) {
ns -= NSEC_PER_SEC;
sec += 1;