diff options
Diffstat (limited to 'sys/kern/kern_tc.c')
| -rw-r--r-- | sys/kern/kern_tc.c | 23 |
1 files changed, 12 insertions, 11 deletions
diff --git a/sys/kern/kern_tc.c b/sys/kern/kern_tc.c index cb9de9c1c34..ee9724226b8 100644 --- a/sys/kern/kern_tc.c +++ b/sys/kern/kern_tc.c @@ -1,4 +1,4 @@ -/* $OpenBSD: kern_tc.c,v 1.40 2019/03/17 01:06:15 cheloha Exp $ */ +/* $OpenBSD: kern_tc.c,v 1.41 2019/03/22 16:21:21 cheloha Exp $ */ /* * Copyright (c) 2000 Poul-Henning Kamp <phk@FreeBSD.org> @@ -104,10 +104,11 @@ static struct timehands th0 = { }; /* - * Protects writes to anything accessed during tc_windup(). + * Serializes writes to the members of the next active timehands. + * * tc_windup() must be called before leaving this mutex. */ -struct mutex timecounter_mtx = MUTEX_INITIALIZER(IPL_CLOCK); +struct mutex windup_mtx = MUTEX_INITIALIZER(IPL_CLOCK); static struct timehands *volatile timehands = &th0; struct timecounter *timecounter = &dummy_timecounter; @@ -355,7 +356,7 @@ tc_setrealtimeclock(const struct timespec *ts) struct timespec ts2; struct bintime bt, bt2; - mtx_enter(&timecounter_mtx); + mtx_enter(&windup_mtx); binuptime(&bt2); timespec2bintime(ts, &bt); bintime_sub(&bt, &bt2); @@ -363,7 +364,7 @@ tc_setrealtimeclock(const struct timespec *ts) /* XXX fiddle all the little crinkly bits around the fiords... */ tc_windup(&bt, NULL); - mtx_leave(&timecounter_mtx); + mtx_leave(&windup_mtx); enqueue_randomness(ts->tv_sec); @@ -401,7 +402,7 @@ tc_setclock(const struct timespec *ts) enqueue_randomness(ts->tv_sec); - mtx_enter(&timecounter_mtx); + mtx_enter(&windup_mtx); timespec2bintime(ts, &bt); bintime_sub(&bt, &timehands->th_boottime); @@ -411,7 +412,7 @@ tc_setclock(const struct timespec *ts) if (bt.sec < timehands->th_offset.sec || (bt.sec == timehands->th_offset.sec && bt.frac < timehands->th_offset.frac)) { - mtx_leave(&timecounter_mtx); + mtx_leave(&windup_mtx); bintime2timespec(&bt, &earlier); printf("%s: cannot rewind uptime to %lld.%09ld\n", __func__, (long long)earlier.tv_sec, earlier.tv_nsec); @@ -422,7 +423,7 @@ tc_setclock(const struct timespec *ts) /* XXX fiddle all the little crinkly bits around the fiords... */ tc_windup(NULL, &bt); - mtx_leave(&timecounter_mtx); + mtx_leave(&windup_mtx); #ifndef SMALL_KERNEL /* convert the bintime to ticks */ @@ -453,7 +454,7 @@ tc_windup(struct bintime *new_boottime, struct bintime *new_offset) u_int delta, ncount, ogen; int i; - MUTEX_ASSERT_LOCKED(&timecounter_mtx); + MUTEX_ASSERT_LOCKED(&windup_mtx); active_tc = timecounter; @@ -655,11 +656,11 @@ tc_ticktock(void) if (++count < tc_tick) return; - if (!mtx_enter_try(&timecounter_mtx)) + if (!mtx_enter_try(&windup_mtx)) return; count = 0; tc_windup(NULL, NULL); - mtx_leave(&timecounter_mtx); + mtx_leave(&windup_mtx); } void |