timecounter: Initialize tc_lock earlier

Hyper-V wants to register its MSR-based timecounter during
SI_SUB_HYPERVISOR, before SI_SUB_LOCK, since an emulated 8254 may not be
available for DELAY().  So we cannot use MTX_SYSINIT to initialize the
timecounter lock.

PR:		259878
Reviewed by:	kib
Sponsored by:	The FreeBSD Foundation

(cherry picked from commit 3339950117bedb5f880f6c08982dcc5dd43f9c34)

1 files changed, 2 insertions, 1 deletions

diff --git a/sys/kern/kern_tc.c b/sys/kern/kern_tc.c
index 135279d48a22..989457b82434 100644
--- a/sys/kern/kern_tc.c
+++ b/sys/kern/kern_tc.c
@@ -100,7 +100,6 @@ static struct timecounter *timecounters = &dummy_timecounter;
 
 /* Mutex to protect the timecounter list. */
 static struct mtx tc_lock;
-MTX_SYSINIT(tc_lock, &tc_lock, "tc", MTX_DEF);
 
 int tc_min_ticktock_freq = 1;
 
@@ -1982,6 +1981,8 @@ inittimehands(void *dummy)
 
 	TUNABLE_STR_FETCH("kern.timecounter.hardware", tc_from_tunable,
 	    sizeof(tc_from_tunable));
+
+	mtx_init(&tc_lock, "tc", NULL, MTX_DEF);
 }
 SYSINIT(timehands, SI_SUB_TUNABLES, SI_ORDER_ANY, inittimehands, NULL);