From ee113343eb1c8cfc690137ad83e37e1cd3c8af10 Mon Sep 17 00:00:00 2001
From: Alan Cox <alc@FreeBSD.org>
Date: Wed, 18 Dec 2002 20:16:22 +0000
Subject: [PATCH] Hold the page queues lock when performing vm_page_busy().

---
 sys/kern/kern_exec.c | 2 ++
 sys/kern/kern_subr.c | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/sys/kern/kern_exec.c b/sys/kern/kern_exec.c
index 6005ea060823..58c0f820b5b1 100644
--- a/sys/kern/kern_exec.c
+++ b/sys/kern/kern_exec.c
@@ -758,7 +758,9 @@ exec_map_first_page(imgp)
 					break;
 				if (ma[i]->valid)
 					break;
+				vm_page_lock_queues();
 				vm_page_busy(ma[i]);
+				vm_page_unlock_queues();
 			} else {
 				ma[i] = vm_page_alloc(object, i,
 				    VM_ALLOC_NORMAL);
diff --git a/sys/kern/kern_subr.c b/sys/kern/kern_subr.c
index 2df1a130a5b2..07708fc1a39f 100644
--- a/sys/kern/kern_subr.c
+++ b/sys/kern/kern_subr.c
@@ -125,7 +125,9 @@ vm_pgmoveco(mapa, srcobj,  kaddr, uaddr)
 			panic("vm_pgmoveco: renaming busy page");
 	}
 	kpindex = kern_pg->pindex;
+	vm_page_lock_queues();
 	vm_page_busy(kern_pg);
+	vm_page_unlock_queues();
 	vm_page_rename(kern_pg, uobject, upindex);
 	vm_page_flag_clear(kern_pg, PG_BUSY);
 	kern_pg->valid = VM_PAGE_BITS_ALL;