From 75d053384736b4a31d11e68cbc32a1d24f44a58a Mon Sep 17 00:00:00 2001
From: Alan Cox <alc@FreeBSD.org>
Date: Sun, 24 Oct 2004 23:53:47 +0000
Subject: [PATCH] Assert that the containing vm object is locked in
 vm_page_busy() and vm_page_wakeup().

---
 sys/vm/vm_page.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sys/vm/vm_page.c b/sys/vm/vm_page.c
index a1f199c60970..ab20e0685071 100644
--- a/sys/vm/vm_page.c
+++ b/sys/vm/vm_page.c
@@ -297,6 +297,8 @@ vm_page_flag_clear(vm_page_t m, unsigned short bits)
 void
 vm_page_busy(vm_page_t m)
 {
+
+	VM_OBJECT_LOCK_ASSERT(m->object, MA_OWNED);
 	KASSERT((m->flags & PG_BUSY) == 0,
 	    ("vm_page_busy: page already busy!!!"));
 	vm_page_flag_set(m, PG_BUSY);
@@ -326,6 +328,8 @@ vm_page_flash(vm_page_t m)
 void
 vm_page_wakeup(vm_page_t m)
 {
+
+	VM_OBJECT_LOCK_ASSERT(m->object, MA_OWNED);
 	KASSERT(m->flags & PG_BUSY, ("vm_page_wakeup: page not busy!!!"));
 	vm_page_flag_clear(m, PG_BUSY);
 	vm_page_flash(m);