From e302b469af18ca7b5b30513ebb9f6ca886687ec9 Mon Sep 17 00:00:00 2001
From: cperciva <cperciva@ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f>
Date: Thu, 6 Jan 2011 22:52:52 +0000
Subject: [PATCH] MFS r217051: Fix panic when mlock(2) is used on i386/XEN.

PR:		kern/140313
Approved by:	re (rwatson)


git-svn-id: svn://svn.freebsd.org/base/releng/8.2@217080 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
---
 sys/i386/xen/pmap.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sys/i386/xen/pmap.c b/sys/i386/xen/pmap.c
index c2ad7513..a567446e 100644
--- a/sys/i386/xen/pmap.c
+++ b/sys/i386/xen/pmap.c
@@ -1070,7 +1070,9 @@ pmap_pte_release(pt_entry_t *pte)
 	if ((pt_entry_t *)((vm_offset_t)pte & ~PAGE_MASK) == PADDR2) {
 		CTR1(KTR_PMAP, "pmap_pte_release: pte=0x%jx",
 		    *PMAP2);
+		vm_page_lock_queues();
 		PT_SET_VA(PMAP2, 0, TRUE);
+		vm_page_unlock_queues();
 		mtx_unlock(&PMAP2mutex);
 	}
 }
-- 
2.42.0