Index: sys/compat/linuxkpi/common/src/linux_slab.c
===================================================================
--- sys/compat/linuxkpi/common/src/linux_slab.c
+++ sys/compat/linuxkpi/common/src/linux_slab.c
@@ -36,6 +36,7 @@
 #include <sys/param.h>
 #include <sys/taskqueue.h>
 #include <vm/uma.h>
+#include <vm/uma_int.h>
 
 struct linux_kmem_rcu {
 	struct rcu_head rcu_head;
@@ -140,6 +141,7 @@
 	c->cache_flags = flags;
 	c->cache_ctor = ctor;
 	c->cache_size = size;
+	c->cache_zone->uz_flags |= UMA_ZFLAG_CACHE;
 	init_llist_head(&c->cache_items);
 	TASK_INIT(&c->cache_task, 0, lkpi_kmem_cache_free_async_fn, c);
 	return (c);