From 17d3cc91e0c266341a2779bcebcd8922babbd6a3 Mon Sep 17 00:00:00 2001
From: Marcel Moolenaar <marcel@FreeBSD.org>
Date: Fri, 15 Jul 2011 02:11:26 +0000
Subject: [PATCH] In pmap_protect(), don't call vm_page_dirty() if the page is
 unmanaged.

---
 sys/arm/arm/pmap.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/sys/arm/arm/pmap.c b/sys/arm/arm/pmap.c
index f68440200c52..d24a4229611a 100644
--- a/sys/arm/arm/pmap.c
+++ b/sys/arm/arm/pmap.c
@@ -3242,9 +3242,12 @@ pmap_protect(pmap_t pm, vm_offset_t sva, vm_offset_t eva, vm_prot_t prot)
 				PTE_SYNC(ptep);
 
 				if (pg != NULL) {
-					f = pmap_modify_pv(pg, pm, sva,
-					    PVF_WRITE, 0);
-					vm_page_dirty(pg);
+					if (!(pg->flags & PG_UNMANAGED)) {
+						f = pmap_modify_pv(pg, pm, sva,
+						    PVF_WRITE, 0);
+						vm_page_dirty(pg);
+					} else
+						f = 0;
 				} else
 					f = PVF_REF | PVF_EXEC;