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-rw-r--r--arch/x86/vdso/vclock_gettime.c39
1 files changed, 36 insertions, 3 deletions
diff --git a/arch/x86/vdso/vclock_gettime.c b/arch/x86/vdso/vclock_gettime.c
index 6a40b78b46a..ee55754cc3c 100644
--- a/arch/x86/vdso/vclock_gettime.c
+++ b/arch/x86/vdso/vclock_gettime.c
@@ -86,14 +86,47 @@ notrace static noinline int do_monotonic(struct timespec *ts)
return 0;
}
+notrace static noinline int do_realtime_coarse(struct timespec *ts)
+{
+ unsigned long seq;
+ do {
+ seq = read_seqbegin(&gtod->lock);
+ ts->tv_sec = gtod->wall_time_coarse.tv_sec;
+ ts->tv_nsec = gtod->wall_time_coarse.tv_nsec;
+ } while (unlikely(read_seqretry(&gtod->lock, seq)));
+ return 0;
+}
+
+notrace static noinline int do_monotonic_coarse(struct timespec *ts)
+{
+ unsigned long seq, ns, secs;
+ do {
+ seq = read_seqbegin(&gtod->lock);
+ secs = gtod->wall_time_coarse.tv_sec;
+ ns = gtod->wall_time_coarse.tv_nsec;
+ secs += gtod->wall_to_monotonic.tv_sec;
+ ns += gtod->wall_to_monotonic.tv_nsec;
+ } while (unlikely(read_seqretry(&gtod->lock, seq)));
+ vset_normalized_timespec(ts, secs, ns);
+ return 0;
+}
+
notrace int __vdso_clock_gettime(clockid_t clock, struct timespec *ts)
{
- if (likely(gtod->sysctl_enabled && gtod->clock.vread))
+ if (likely(gtod->sysctl_enabled))
switch (clock) {
case CLOCK_REALTIME:
- return do_realtime(ts);
+ if (likely(gtod->clock.vread))
+ return do_realtime(ts);
+ break;
case CLOCK_MONOTONIC:
- return do_monotonic(ts);
+ if (likely(gtod->clock.vread))
+ return do_monotonic(ts);
+ break;
+ case CLOCK_REALTIME_COARSE:
+ return do_realtime_coarse(ts);
+ case CLOCK_MONOTONIC_COARSE:
+ return do_monotonic_coarse(ts);
}
return vdso_fallback_gettime(clock, ts);
}