From 3d14a7bb43d3bff2dad31f0bc928dda275ad86b1 Mon Sep 17 00:00:00 2001
From: Mark Johnston <markj@FreeBSD.org>
Date: Mon, 24 Sep 2018 15:32:46 +0000
Subject: [PATCH] Ensure that "domain" is initialized when vm_ndomains == 1.

Reported by:	alc
Approved by:	re (gjb)
---
 sys/vm/vm_kern.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/sys/vm/vm_kern.c b/sys/vm/vm_kern.c
index b5915c074ab6..9774e0b4f22d 100644
--- a/sys/vm/vm_kern.c
+++ b/sys/vm/vm_kern.c
@@ -505,8 +505,10 @@ kmem_back(vm_object_t object, vm_offset_t addr, vm_size_t size, int flags)
 			next = roundup2(addr + 1, KVA_QUANTUM);
 			if (next > end || next < start)
 				next = end;
-		} else
+		} else {
+			domain = 0;
 			next = end;
+		}
 		rv = kmem_back_domain(domain, object, addr, next - addr, flags);
 		if (rv != KERN_SUCCESS) {
 			kmem_unback(object, start, addr - start);