From eb13174a6b6be159823a147ca01a731b0a75cb3d Mon Sep 17 00:00:00 2001
From: Alan Cox <alc@FreeBSD.org>
Date: Sat, 27 Jul 2002 05:08:49 +0000
Subject: [PATCH]  o Lock page queue accesses by vm_page_activate() and
 vm_page_deactivate().

---
 sys/fs/specfs/spec_vnops.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sys/fs/specfs/spec_vnops.c b/sys/fs/specfs/spec_vnops.c
index f559b796a438..4ccb2db4c7fe 100644
--- a/sys/fs/specfs/spec_vnops.c
+++ b/sys/fs/specfs/spec_vnops.c
@@ -760,8 +760,8 @@ spec_getpages(ap)
 	}
 	pmap_qremove(kva, pcount);
 
-
 	gotreqpage = 0;
+	vm_page_lock_queues();
 	for (i = 0, toff = 0; i < pcount; i++, toff = nextoff) {
 		nextoff = toff + PAGE_SIZE;
 		m = ap->a_m[i];
@@ -812,6 +812,7 @@ spec_getpages(ap)
 				vm_page_zero_invalid(m, FALSE);
 		}
 	}
+	vm_page_unlock_queues();
 	if (!gotreqpage) {
 		m = ap->a_m[ap->a_reqpage];
 		printf(