The branch stable/12 has been updated by kevans:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=ac6e3a14070ec6e4a898857f1022eba3d999edba

commit ac6e3a14070ec6e4a898857f1022eba3d999edba
Author:     Mateusz Guzik <[email protected]>
AuthorDate: 2020-11-17 00:04:05 +0000
Commit:     Kyle Evans <[email protected]>
CommitDate: 2021-01-24 04:03:32 +0000

    cpuset: refcount-clean
    
    (cherry picked from commit 1a7bb8962904b4eef9d968d98afda31c08612868)
---
 sys/kern/kern_cpuset.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sys/kern/kern_cpuset.c b/sys/kern/kern_cpuset.c
index 9206ac3b5235..aa3f6bb70bca 100644
--- a/sys/kern/kern_cpuset.c
+++ b/sys/kern/kern_cpuset.c
@@ -1603,7 +1603,7 @@ cpuset_thread0(void)
        CPU_COPY(&all_cpus, &set->cs_mask);
        LIST_INIT(&set->cs_children);
        LIST_INSERT_HEAD(&cpuset_ids, set, cs_link);
-       set->cs_ref = 1;
+       refcount_init(&set->cs_ref, 1);
        set->cs_flags = CPU_SET_ROOT | CPU_SET_RDONLY;
        set->cs_domain = &domainset0;
        cpuset_zero = set;
@@ -2414,7 +2414,7 @@ DB_SHOW_COMMAND(cpusets, db_show_cpusets)
 
        LIST_FOREACH(set, &cpuset_ids, cs_link) {
                db_printf("set=%p id=%-6u ref=%-6d flags=0x%04x parent id=%d\n",
-                   set, set->cs_id, set->cs_ref, set->cs_flags,
+                   set, set->cs_id, refcount_load(&set->cs_ref), set->cs_flags,
                    (set->cs_parent != NULL) ? set->cs_parent->cs_id : 0);
                db_printf("  cpu mask=");
                ddb_display_cpuset(&set->cs_mask);
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