From ccfd886a1b36fe923137cf197c87f013a134a0ff Mon Sep 17 00:00:00 2001
From: Alan Cox <alc@FreeBSD.org>
Date: Fri, 23 Oct 2020 06:24:38 +0000
Subject: [PATCH] Conditionally compile struct vm_phys_seg's md_first field. 
 This field is only used by arm64's pmap.

Reviewed by:	kib, markj, scottph
Differential Revision:	https://reviews.freebsd.org/D26907
---
 sys/vm/vm_phys.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sys/vm/vm_phys.h b/sys/vm/vm_phys.h
index c91e1aa77dc..497eee16c18 100644
--- a/sys/vm/vm_phys.h
+++ b/sys/vm/vm_phys.h
@@ -71,7 +71,9 @@ struct vm_phys_seg {
 #if VM_NRESERVLEVEL > 0
 	vm_reserv_t	first_reserv;
 #endif
+#ifdef __aarch64__
 	void		*md_first;
+#endif
 	int		domain;
 	struct vm_freelist (*free_queues)[VM_NFREEPOOL][VM_NFREEORDER_MAX];
 };