D50075.id154480.diff
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	diff --git a/sys/kern/kern_time.c b/sys/kern/kern_time.c
	--- a/sys/kern/kern_time.c
	+++ b/sys/kern/kern_time.c
	@@ -504,24 +504,27 @@
	sbintime_t sbt, sbtt, prec, tmp;
	time_t over;
	int error;
	- bool is_abs_real;
	+ bool is_abs_real, precise;

	if (rqt->tv_nsec < 0 \|\| rqt->tv_nsec >= NS_PER_SEC)
	return (EINVAL);
	if ((flags & ~TIMER_ABSTIME) != 0)
	return (EINVAL);
	+ precise = false;
	switch (clock_id) {
	case CLOCK_REALTIME:
	case CLOCK_REALTIME_PRECISE:
	+ precise = true;
	case CLOCK_REALTIME_FAST:
	case CLOCK_SECOND:
	is_abs_real = (flags & TIMER_ABSTIME) != 0;
	break;
	case CLOCK_MONOTONIC:
	- case CLOCK_MONOTONIC_PRECISE:
	- case CLOCK_MONOTONIC_FAST:
	case CLOCK_UPTIME:
	+ case CLOCK_MONOTONIC_PRECISE:
	case CLOCK_UPTIME_PRECISE:
	+ precise = true;
	+ case CLOCK_MONOTONIC_FAST:
	case CLOCK_UPTIME_FAST:
	is_abs_real = false;
	break;
	@@ -553,8 +556,7 @@
	} else
	over = 0;
	tmp = tstosbt(ts);
	- prec = tmp;
	- prec >>= tc_precexp;
	+ prec = precise ? 0 : tmp >> tc_precexp;
	if (TIMESEL(&sbt, tmp))
	sbt += tc_tick_sbt;
	sbt += tmp;