diff --git a/sys/contrib/openzfs/module/os/freebsd/zfs/arc_os.c b/sys/contrib/openzfs/module/os/freebsd/zfs/arc_os.c
index 92696c0bf1ae..478b74828c65 100644
--- a/sys/contrib/openzfs/module/os/freebsd/zfs/arc_os.c
+++ b/sys/contrib/openzfs/module/os/freebsd/zfs/arc_os.c
@@ -1,196 +1,196 @@
 /*
  * CDDL HEADER START
  *
  * The contents of this file are subject to the terms of the
  * Common Development and Distribution License (the "License").
  * You may not use this file except in compliance with the License.
  *
  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  * or https://opensource.org/licenses/CDDL-1.0.
  * See the License for the specific language governing permissions
  * and limitations under the License.
  *
  * When distributing Covered Code, include this CDDL HEADER in each
  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  * If applicable, add the following below this CDDL HEADER, with the
  * fields enclosed by brackets "[]" replaced with your own identifying
  * information: Portions Copyright [yyyy] [name of copyright owner]
  *
  * CDDL HEADER END
  */
 
 #include <sys/spa.h>
 #include <sys/zio.h>
 #include <sys/spa_impl.h>
 #include <sys/counter.h>
 #include <sys/zio_compress.h>
 #include <sys/zio_checksum.h>
 #include <sys/zfs_context.h>
 #include <sys/arc.h>
 #include <sys/arc_os.h>
 #include <sys/zfs_refcount.h>
 #include <sys/vdev.h>
 #include <sys/vdev_trim.h>
 #include <sys/vdev_impl.h>
 #include <sys/dsl_pool.h>
 #include <sys/zio_checksum.h>
 #include <sys/multilist.h>
 #include <sys/abd.h>
 #include <sys/zil.h>
 #include <sys/fm/fs/zfs.h>
 #include <sys/eventhandler.h>
 #include <sys/callb.h>
 #include <sys/kstat.h>
 #include <sys/zthr.h>
 #include <zfs_fletcher.h>
 #include <sys/arc_impl.h>
 #include <sys/sdt.h>
 #include <sys/aggsum.h>
 #include <sys/vnode.h>
 #include <cityhash.h>
 #include <machine/vmparam.h>
 #include <sys/vm.h>
 #include <sys/vmmeter.h>
 
 extern struct vfsops zfs_vfsops;
 
 uint_t zfs_arc_free_target = 0;
 
 static void
 arc_free_target_init(void *unused __unused)
 {
 	zfs_arc_free_target = vm_cnt.v_free_target;
 }
 SYSINIT(arc_free_target_init, SI_SUB_KTHREAD_PAGE, SI_ORDER_ANY,
     arc_free_target_init, NULL);
 
 /*
  * We don't have a tunable for arc_free_target due to the dependency on
  * pagedaemon initialisation.
  */
 ZFS_MODULE_PARAM_CALL(zfs_arc, zfs_arc_, free_target,
     param_set_arc_free_target, 0, CTLFLAG_RW,
 	"Desired number of free pages below which ARC triggers reclaim");
 ZFS_MODULE_PARAM_CALL(zfs_arc, zfs_arc_, no_grow_shift,
     param_set_arc_no_grow_shift, 0, ZMOD_RW,
 	"log2(fraction of ARC which must be free to allow growing)");
 
 int64_t
 arc_available_memory(void)
 {
 	int64_t lowest = INT64_MAX;
 	int64_t n __unused;
 
 	/*
 	 * Cooperate with pagedaemon when it's time for it to scan
 	 * and reclaim some pages.
 	 */
 	n = PAGESIZE * ((int64_t)freemem - zfs_arc_free_target);
 	if (n < lowest) {
 		lowest = n;
 	}
-#if defined(__i386) || !defined(UMA_MD_SMALL_ALLOC)
+#if !defined(UMA_MD_SMALL_ALLOC) && !defined(UMA_USE_DMAP)
 	/*
 	 * If we're on an i386 platform, it's possible that we'll exhaust the
 	 * kernel heap space before we ever run out of available physical
 	 * memory.  Most checks of the size of the heap_area compare against
 	 * tune.t_minarmem, which is the minimum available real memory that we
 	 * can have in the system.  However, this is generally fixed at 25 pages
 	 * which is so low that it's useless.  In this comparison, we seek to
 	 * calculate the total heap-size, and reclaim if more than 3/4ths of the
 	 * heap is allocated.  (Or, in the calculation, if less than 1/4th is
 	 * free)
 	 */
 	n = uma_avail() - (long)(uma_limit() / 4);
 	if (n < lowest) {
 		lowest = n;
 	}
 #endif
 
 	DTRACE_PROBE1(arc__available_memory, int64_t, lowest);
 	return (lowest);
 }
 
 /*
  * Return a default max arc size based on the amount of physical memory.
  */
 uint64_t
 arc_default_max(uint64_t min, uint64_t allmem)
 {
 	uint64_t size;
 
 	if (allmem >= 1 << 30)
 		size = allmem - (1 << 30);
 	else
 		size = min;
 	return (MAX(allmem * 5 / 8, size));
 }
 
 uint64_t
 arc_all_memory(void)
 {
 	return (ptob(physmem));
 }
 
 int
 arc_memory_throttle(spa_t *spa, uint64_t reserve, uint64_t txg)
 {
 	return (0);
 }
 
 uint64_t
 arc_free_memory(void)
 {
 	return (ptob(freemem));
 }
 
 static eventhandler_tag arc_event_lowmem = NULL;
 
 static void
 arc_lowmem(void *arg __unused, int howto __unused)
 {
 	int64_t free_memory, to_free;
 
 	arc_no_grow = B_TRUE;
 	arc_warm = B_TRUE;
 	arc_growtime = gethrtime() + SEC2NSEC(arc_grow_retry);
 	free_memory = arc_available_memory();
 	int64_t can_free = arc_c - arc_c_min;
 	if (can_free <= 0)
 		return;
 	to_free = (can_free >> arc_shrink_shift) - MIN(free_memory, 0);
 	DTRACE_PROBE2(arc__needfree, int64_t, free_memory, int64_t, to_free);
 	arc_reduce_target_size(to_free);
 
 	/*
 	 * It is unsafe to block here in arbitrary threads, because we can come
 	 * here from ARC itself and may hold ARC locks and thus risk a deadlock
 	 * with ARC reclaim thread.
 	 */
 	if (curproc == pageproc)
 		arc_wait_for_eviction(to_free, B_FALSE);
 }
 
 void
 arc_lowmem_init(void)
 {
 	arc_event_lowmem = EVENTHANDLER_REGISTER(vm_lowmem, arc_lowmem, NULL,
 	    EVENTHANDLER_PRI_FIRST);
 }
 
 void
 arc_lowmem_fini(void)
 {
 	if (arc_event_lowmem != NULL)
 		EVENTHANDLER_DEREGISTER(vm_lowmem, arc_event_lowmem);
 }
 
 void
 arc_register_hotplug(void)
 {
 }
 
 void
 arc_unregister_hotplug(void)
 {
 }