Index: swap_pager.c
===================================================================
--- sys/vm/swap_pager.c	(.../vmcontention/sys/vm/swap_pager.c)	(revision 250794)
+++ sys/vm/swap_pager.c	(.../vmobj-readlock/sys/vm/swap_pager.c)	(revision 250794)
@@ -827,7 +827,6 @@ void
 swap_pager_freespace(vm_object_t object, vm_pindex_t start, vm_size_t size)
 {
 
-	VM_OBJECT_ASSERT_WLOCKED(object);
 	swp_pager_meta_free(object, start, size);
 }
 
@@ -999,7 +998,7 @@ swap_pager_haspage(vm_object_t object, vm_pindex_t
 {
 	daddr_t blk0;
 
-	VM_OBJECT_ASSERT_WLOCKED(object);
+	VM_OBJECT_ASSERT_LOCKED(object);
 	/*
 	 * do we have good backing store at the requested index ?
 	 */
@@ -1070,7 +1069,6 @@ static void
 swap_pager_unswapped(vm_page_t m)
 {
 
-	VM_OBJECT_ASSERT_WLOCKED(m->object);
 	swp_pager_meta_ctl(m->object, m->pindex, SWM_FREE);
 }
 
@@ -1916,7 +1922,7 @@ static void
 swp_pager_meta_free(vm_object_t object, vm_pindex_t index, daddr_t count)
 {
 
-	VM_OBJECT_ASSERT_WLOCKED(object);
+	VM_OBJECT_ASSERT_LOCKED(object);
 	if (object->type != OBJT_SWAP)
 		return;
 
@@ -2021,7 +2027,7 @@ swp_pager_meta_ctl(vm_object_t object, vm_pindex_t
 	daddr_t r1;
 	int idx;
 
-	VM_OBJECT_ASSERT_WLOCKED(object);
+	VM_OBJECT_ASSERT_LOCKED(object);
 	/*
 	 * The meta data only exists of the object is OBJT_SWAP
 	 * and even then might not be allocated yet.