From cd4d97b43950ebdd458b7fe88767b57e46e76fea Mon Sep 17 00:00:00 2001
From: Kip Macy <kmacy@FreeBSD.org>
Date: Sun, 25 Apr 2010 23:51:05 +0000
Subject: [PATCH] missed pv access before pmap lock

---
 sys/amd64/amd64/pmap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sys/amd64/amd64/pmap.c b/sys/amd64/amd64/pmap.c
index c4f1e992a0d..d07292dd2c2 100644
--- a/sys/amd64/amd64/pmap.c
+++ b/sys/amd64/amd64/pmap.c
@@ -2793,9 +2793,9 @@ pmap_remove_all(vm_page_t m)
 	mtx_assert(&vm_page_queue_mtx, MA_OWNED);
 	pvh = pa_to_pvh(VM_PAGE_TO_PHYS(m));
 	while ((pv = TAILQ_FIRST(&pvh->pv_list)) != NULL) {
-		va = pv->pv_va;
 		pmap = PV_PMAP(pv);
 		PMAP_LOCK(pmap);
+		va = pv->pv_va;
 		pde = pmap_pde(pmap, va);
 		(void)pmap_demote_pde(pmap, pde, va);
 		PMAP_UNLOCK(pmap);